ASTM B366/B366M-23
(Specification)Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings
ABSTRACT
This specification covers wrought welding fittings, including threaded fittings, for pressure piping, factory-made from nickel and nickel alloys. The term welding applies to butt-welding or socket-welding parts such as elbows, bends, caps, tees, reducers, lap-joint, and stub ends. This specification does not apply to cast welding fittings. Grades of nickel and nickel alloys included in this specification are designated with a prefix, WP or CR, based on dimensional and rating standards. WP grades have class designations (Class S, Class W, Class WX, and Class WU) to indicate whether seamless or welded construction is utilized and to indicate the nondestructive test method and extent of nondestructive examination (such as radiography and/or ultrasonic test). The material for wrought welding fittings may consist of forgings, rods, bars, plates, sheets, and seamless or welded pipe that conform to all the specified requirements. Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, or fusion welding, or by a combination of two or more of these operations. Chemical and product analyses shall conform to the chemical composition prescribed. Requirements for tensile properties, heat treatment, tension test, and dimensions are detailed. Hydrostatic testing of wrought fittings is not required by this specification.
SCOPE
1.1 This specification covers wrought welding fittings for pressure piping, factory-made from nickel and nickel alloys. Threaded fittings as covered in ASME B16.11 are also covered by this specification. The term welding applies to butt-welding or socket-welding parts such as 45° and 90° elbows, 180° bends, caps, tees, reducers, lap-joint stub ends, and other types, as covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-95, and MSS SP-97.
1.1.1 Several grades of nickel and nickel alloys are included in this specification. Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards.
1.1.2 Class WP fittings are those manufactured to the requirements of ASME B16.9, B16.11.
1.1.3 For each of the WP nickel and nickel alloy grades, several classes of fittings are covered to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is general summary of the fitting classes applicable to all WP grades of nickel and nickel alloys covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.
1.2 This specification does not apply to cast welding fittings.
1.3 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. These supplementary requirements call for additional tests. When desired, one or more of these may be specified in the order.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of Inter...
General Information
- Status
- Published
- Publication Date
- 31-Mar-2023
- Technical Committee
- B02 - Nonferrous Metals and Alloys
- Drafting Committee
- B02.07 - Refined Nickel and Cobalt and Their Alloys
Relations
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Refers
ASTM B473-24 - Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Bar and Wire - Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Effective Date
- 01-Apr-2024
- Refers
ASTM B622-23 - Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube - Effective Date
- 01-Dec-2023
- Effective Date
- 01-Dec-2023
- Effective Date
- 01-Nov-2023
- Effective Date
- 01-Nov-2023
- Effective Date
- 01-Nov-2023
- Effective Date
- 01-Nov-2023
- Refers
ASTM B619/B619M-19(2023) - Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe - Effective Date
- 01-Nov-2023
- Effective Date
- 01-Apr-2020
Overview
ASTM B366/B366M-23: Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings defines the requirements for factory-made, wrought welding fittings (including threaded types) for pressure piping, specifically when produced from nickel and nickel alloys. This specification outlines the materials, manufacturing methods, marking, testing, inspection, and certification of fittings such as elbows, bends, caps, tees, reducers, lap-joint stub ends, and more. Cast fittings are not covered under this standard.
This document is essential for industries where nickel alloy fittings are required due to their high resistance to corrosion and excellent mechanical properties in demanding environments.
Key Topics
- Scope: Covers wrought welding and threaded fittings for pressure piping, factory-made from a range of nickel and nickel alloys. Excludes cast welding fittings.
- Grades & Classes: Fittings are designated by grades (WP or CR) and WP class designations (S for seamless, W for welded) indicating the construction method and level of nondestructive examination (radiography or ultrasonic testing).
- Manufacturing Methods: Permissible processes include forging, pressing, hammering, rolling, bending, extruding, upsetting, and fusion welding.
- Material Compliance: Fittings must be produced from materials conforming to referenced ASTM base material specifications.
- Testing & Inspection:
- Nondestructive Examination (NDE): Requirements depend on the class of fitting and may include radiographic or ultrasonic testing.
- Mechanical Testing: Tensile properties must comply with those listed in referenced base material standards; additional testing may be specified.
- Heat Treatment: All fittings must be properly heat treated, with parameters depending on alloy type.
- Hydrostatic Test: Not required by this specification, but fittings must withstand relevant service pressures without failure.
- Marking: Each fitting must be marked with the manufacturer’s identification, material grade, size, and relevant class/code info, following the recommended permanent marking methods.
- Supplementary Requirements: Optional additional testing and reporting as specified by the purchaser.
Applications
ASTM B366/B366M-23 is critical in settings that demand reliable, corrosion-resistant, high-pressure piping systems. Typical applications include:
- Chemical processing facilities: Resistance to aggressive chemicals and acidic environments.
- Oil and gas: Used for piping systems handling sour gas, hydrocarbons, and high-pressure steam.
- Power generation: Particularly in nuclear plants, where material integrity is essential.
- Pharmaceutical and food industries: Where both corrosion resistance and cleanliness are required.
- Marine and offshore engineering: Resistance to seawater corrosion and harsh operational conditions.
By specifying nickel alloy fittings with verified mechanical and chemical properties, industries ensure the longevity and safety of their critical piping systems.
Related Standards
- ASME B16.9 - Wrought Steel Butt Welding Fittings: Dimensional standards referenced for fitting shapes and sizes.
- ASME B16.11 - Forged Steel Fittings, Socket-Welding and Threaded: Referenced for threaded fitting criteria.
- MSS SP-43, SP-95, SP-97 - Fabricated and lightweight fittings, special outlets, and branches.
- Key ASTM Base Material Specifications:
- ASTM B161, B162, B163, B165, B167, B407, B423, B574, B880, and others, depending on specific alloy.
- AWS A5.11 & A5.14 - Nickel and nickel alloy welding electrodes and rods.
- ASNT SNT-TC-1A - Nondestructive Testing Personnel Qualification and Certification.
Keywords: nickel alloy fittings, ASTM B366, pressure piping, factory-made fittings, nondestructive examination, welding fittings standard, heat treatment, pipe fittings specification, corrosion resistant fittings, ASME B16.9, ASME B16.11
For full technical requirements, always consult the latest official ASTM B366/B366M publication.
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Frequently Asked Questions
ASTM B366/B366M-23 is a technical specification published by ASTM International. Its full title is "Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings". This standard covers: ABSTRACT This specification covers wrought welding fittings, including threaded fittings, for pressure piping, factory-made from nickel and nickel alloys. The term welding applies to butt-welding or socket-welding parts such as elbows, bends, caps, tees, reducers, lap-joint, and stub ends. This specification does not apply to cast welding fittings. Grades of nickel and nickel alloys included in this specification are designated with a prefix, WP or CR, based on dimensional and rating standards. WP grades have class designations (Class S, Class W, Class WX, and Class WU) to indicate whether seamless or welded construction is utilized and to indicate the nondestructive test method and extent of nondestructive examination (such as radiography and/or ultrasonic test). The material for wrought welding fittings may consist of forgings, rods, bars, plates, sheets, and seamless or welded pipe that conform to all the specified requirements. Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, or fusion welding, or by a combination of two or more of these operations. Chemical and product analyses shall conform to the chemical composition prescribed. Requirements for tensile properties, heat treatment, tension test, and dimensions are detailed. Hydrostatic testing of wrought fittings is not required by this specification. SCOPE 1.1 This specification covers wrought welding fittings for pressure piping, factory-made from nickel and nickel alloys. Threaded fittings as covered in ASME B16.11 are also covered by this specification. The term welding applies to butt-welding or socket-welding parts such as 45° and 90° elbows, 180° bends, caps, tees, reducers, lap-joint stub ends, and other types, as covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-95, and MSS SP-97. 1.1.1 Several grades of nickel and nickel alloys are included in this specification. Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards. 1.1.2 Class WP fittings are those manufactured to the requirements of ASME B16.9, B16.11. 1.1.3 For each of the WP nickel and nickel alloy grades, several classes of fittings are covered to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is general summary of the fitting classes applicable to all WP grades of nickel and nickel alloys covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere. 1.2 This specification does not apply to cast welding fittings. 1.3 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. These supplementary requirements call for additional tests. When desired, one or more of these may be specified in the order. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of Inter...
ABSTRACT This specification covers wrought welding fittings, including threaded fittings, for pressure piping, factory-made from nickel and nickel alloys. The term welding applies to butt-welding or socket-welding parts such as elbows, bends, caps, tees, reducers, lap-joint, and stub ends. This specification does not apply to cast welding fittings. Grades of nickel and nickel alloys included in this specification are designated with a prefix, WP or CR, based on dimensional and rating standards. WP grades have class designations (Class S, Class W, Class WX, and Class WU) to indicate whether seamless or welded construction is utilized and to indicate the nondestructive test method and extent of nondestructive examination (such as radiography and/or ultrasonic test). The material for wrought welding fittings may consist of forgings, rods, bars, plates, sheets, and seamless or welded pipe that conform to all the specified requirements. Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending, or fusion welding, or by a combination of two or more of these operations. Chemical and product analyses shall conform to the chemical composition prescribed. Requirements for tensile properties, heat treatment, tension test, and dimensions are detailed. Hydrostatic testing of wrought fittings is not required by this specification. SCOPE 1.1 This specification covers wrought welding fittings for pressure piping, factory-made from nickel and nickel alloys. Threaded fittings as covered in ASME B16.11 are also covered by this specification. The term welding applies to butt-welding or socket-welding parts such as 45° and 90° elbows, 180° bends, caps, tees, reducers, lap-joint stub ends, and other types, as covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-95, and MSS SP-97. 1.1.1 Several grades of nickel and nickel alloys are included in this specification. Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards. 1.1.2 Class WP fittings are those manufactured to the requirements of ASME B16.9, B16.11. 1.1.3 For each of the WP nickel and nickel alloy grades, several classes of fittings are covered to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is general summary of the fitting classes applicable to all WP grades of nickel and nickel alloys covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere. 1.2 This specification does not apply to cast welding fittings. 1.3 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. These supplementary requirements call for additional tests. When desired, one or more of these may be specified in the order. 1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of Inter...
ASTM B366/B366M-23 is classified under the following ICS (International Classification for Standards) categories: 23.040.40 - Metal fittings; 77.150.40 - Nickel and chromium products. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM B366/B366M-23 has the following relationships with other standards: It is inter standard links to ASTM B160-24, ASTM B573-24, ASTM B166-24, ASTM B473-24, ASTM B705-24, ASTM B572-24, ASTM B516-24, ASTM B622-23, ASTM B472-23, ASTM B574-23, ASTM B446-23, ASTM B167-23, ASTM B704-23, ASTM B619/B619M-19(2023), ASTM B512-20. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM B366/B366M-23 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B366/B366M − 23
Standard Specification for
Factory-Made Wrought Nickel and Nickel Alloy Fittings
This standard is issued under the fixed designation B366/B366M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This specification covers wrought welding fittings for
responsibility of the user of this standard to become familiar
pressure piping, factory-made from nickel and nickel alloys.
with all hazards including those identified in the appropriate
Threaded fittings as covered in ASME B16.11 are also covered
Safety Data Sheet (SDS) for this product/material as provided
by this specification. The term welding applies to butt-welding
by the manufacturer, to establish appropriate safety, health,
or socket-welding parts such as 45° and 90° elbows, 180°
and environmental practices, and determine the applicability
bends, caps, tees, reducers, lap-joint stub ends, and other types,
of regulatory limitations prior to use.
as covered by ASME B16.9, ASME B16.11, MSS SP-43, MSS
1.6 This international standard was developed in accor-
SP-95, and MSS SP-97.
dance with internationally recognized principles on standard-
1.1.1 Several grades of nickel and nickel alloys are included
ization established in the Decision on Principles for the
in this specification. Grades are designated with a prefix, WP or
Development of International Standards, Guides and Recom-
CR, based on the applicable ASME or MSS dimensional and
mendations issued by the World Trade Organization Technical
rating standards.
Barriers to Trade (TBT) Committee.
1.1.2 Class WP fittings are those manufactured to the
requirements of ASME B16.9, B16.11.
2. Referenced Documents
1.1.3 For each of the WP nickel and nickel alloy grades,
2.1 ASTM Standards:
several classes of fittings are covered to indicate whether
B127 Specification for Nickel-Copper Alloy Plate, Sheet,
seamless or welded construction was utilized. Class designa-
and Strip
tions are also utilized to indicate the nondestructive test method
B160 Specification for Nickel Rod and Bar
and extent of nondestructive examination (NDE). Table 1 is
B161 Specification for Nickel Seamless Pipe and Tube
general summary of the fitting classes applicable to all WP
B162 Specification for Nickel Plate, Sheet, and Strip
grades of nickel and nickel alloys covered by this specification.
B163 Specification for Seamless Nickel and Nickel Alloy
There are no classes for the CR grades. Specific requirements
Condenser and Heat-Exchanger Tubes
are covered elsewhere.
B164 Specification for Nickel-Copper Alloy Rod, Bar, and
1.2 This specification does not apply to cast welding fit-
Wire
tings.
B165 Specification for Nickel-Copper Alloy Seamless Pipe
1.3 Optional supplementary requirements are provided for
and Tube
fittings where a greater degree of examination is desired. These
B166 Specification for Nickel-Chromium-Aluminum Alloy,
supplementary requirements call for additional tests. When
Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-
desired, one or more of these may be specified in the order.
Molybdenum Alloy, Nickel-Iron-Chromium-Tungsten
Alloy, and Nickel-Chromium-Molybdenum-Copper Alloy
1.4 The values stated in either SI units or inch-pound units
Rod, Bar, and Wire
are to be regarded separately as standard. The values stated in
B167 Specification for Standard Specification for Nickel-
each system are not necessarily exact equivalents; therefore, to
Chromium-Aluminum Alloys (UNS N06699) Nickel-
ensure conformance with the standard, each system shall be
Chromium-Iron Alloys (UNS N06600, N06601, N06603,
used independently of the other, and values from the two
N06690, N06693, N06025, N06045, and N06696) Nickel-
systems shall not be combined.
Chromium-Cobalt-Molybdenum Alloy (UNS N06617)
Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674)
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.07 on Refined Nickel and Cobalt and Their Alloys. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2023. Published April 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1961. Last previous edition approved in 2020 as B366/B366M – 20. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0366_B0366M-23. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B366/B366M − 23
TABLE 1 Fitting Classes for WP Grades
B511 Specification for Nickel-Iron-Chromium-Silicon Alloy
Class Construction Nondestructive Examination Bars and Shapes
S Seamless None
B512 Specification for Nickel-Chromium-Silicon Alloy Bil-
W Welded Radiography or Ultrasonic
lets and Bars
WX Welded Radiography
B514 Specification for Welded Nickel-Iron-Chromium Alloy
WU Welded Ultrasonic
Pipe
B515 Specification for Welded Nickel-Iron-Chromium Alloy
Tubes
and Nickel-Chromium-Molybdenum-Copper Alloy (UNS
B516 Specification for Welded Nickel-Chromium-
N06235) Seamless Pipe and Tube
Aluminum Alloy (UNS N06699) and Nickel-Chromium-
B168 Specification for Nickel-Chromium-Aluminum Alloys
Iron Alloy (UNS N06600, UNS N06601, UNS N06603,
(UNS N06699), Nickel-Chromium-Iron Alloys (UNS
UNS N06025, UNS N06045, UNS N06690, and UNS
N06600, N06601, N06603, N06690, N06693, N06025,
N06693) Tubes
N06045, and N06696), Nickel-Chromium-Cobalt-
B517 Specification for Welded Nickel-Chromium-Iron-
Molybdenum Alloy (UNS N06617), Nickel-Iron-
Alloy Pipe
Chromium-Tungsten Alloy (UNS N06674), and
B535 Specification for Nickel-Iron-Chromium-Silicon Al-
B333 Specification for Nickel-Molybdenum Alloy Plate,
loys (UNS N08330 and N08332) Seamless Pipe and Tube
Sheet, and Strip
B536 Specification for Nickel-Iron-Chromium-Silicon Al-
B335 Specification for Nickel-Molybdenum Alloy Rod
loys Plate, Sheet, and Strip
B407 Specification for Nickel-Iron-Chromium Alloy Seam-
B564 Specification for Nickel Alloy Forgings
less Pipe and Tube
B572 Specification for UNS N06002, UNS N06230, UNS
B408 Specification for Nickel-Iron-Chromium Alloy Rod
N12160, and UNS R30556 Rod
and Bar
B409 Specification for Nickel-Iron-Chromium Alloy Plate, B573 Specification for Nickel-Molybdenum-Chromium-
Iron Alloys (UNS N10003, N10242) Rod
Sheet, and Strip
B423 Specification for Nickel-Iron-Chromium- B574 Specification for Low-Carbon Nickel-Chromium-
Molybdenum-Copper Alloy Seamless Pipe and Tube Molybdenum, Low-Carbon Nickel-Molybdenum-
B424 Specification for Nickel-Iron-Chromium-
Chromium, Low-Carbon Nickel-Molybdenum-
Molybdenum-Copper Alloys Plate, Sheet, and Strip
Chromium-Tantalum, Low-Carbon Nickel-Chromium-
B425 Specification for Nickel-Iron-Chromium-
Molybdenum-Copper, and Low-Carbon Nickel-
Molybdenum-Copper Alloys Rod and Bar
Chromium-Molybdenum-Tungsten Alloy Rod
B434 Specification for Nickel-Molybdenum-Chromium-
B575 Specification for Low-Carbon Nickel-Chromium-
Iron Alloys Plate, Sheet, and Strip
Molybdenum, Low-Carbon Nickel-Chromium-
B435 Specification for Heat and Corrosion Resistant High
Molybdenum-Copper, Low-Carbon Nickel-Chromium-
Temperature Alloy Plate, Sheet, and Strip
Molybdenum-Tantalum, Low-Carbon Nickel-Chromium-
B443 Specification for Nickel-Chromium-Molybdenum-
Molybdenum-Tungsten, and Low-Carbon Nickel-
Columbium Alloy and Nickel-Chromium-Molybdenum-
Molybdenum-Chromium Alloy Plate, Sheet, and Strip
Silicon Alloy Plate, Sheet, and Strip
B581 Specification for Nickel-Chromium-Iron-
B444 Specification for Nickel-Chromium-Molybdenum-
Molybdenum-Copper Alloy Rod
Columbium Alloys (UNS N06625 and UNS N06852) and
B582 Specification for Nickel-Chromium-Iron-
Nickel-Chromium-Molybdenum-Silicon Alloy (UNS
Molybdenum-Copper Alloy Plate, Sheet, and Strip
N06219) Pipe and Tube
B619/B619M Specification for Welded Nickel and Nickel-
B446 Specification for Nickel-Chromium-Molybdenum-
Cobalt Alloy Pipe
Columbium Alloy (UNS N06625), Nickel-Chromium-
B622 Specification for Seamless Nickel and Nickel-Cobalt
Molybdenum-Silicon Alloy (UNS N06219), and Nickel-
Alloy Pipe and Tube
Chromium-Molybdenum-Tungsten Alloy (UNS N06650)
B625 Specification for Ni-Fe-Cr-Mo-Cu-N Low-Carbon
Rod and Bar
Alloy, Ni-Fe-Cr-Si Alloy, Cr-Ni-Fe-N Low-Carbon Alloy,
B462 Specification for Forged or Rolled Nickel Alloy Pipe
Fe-Ni-Cr-Mo-Cu-N Alloy, and Ni-Fe-Cr-Mo-N Alloy
Flanges, Forged Fittings, and Valves and Parts for Corro-
Plate, Sheet, and Strip
sive High-Temperature Service
B626 Specification for Welded Nickel and Nickel-Cobalt
B463 Specification for UNS N08020 Alloy Plate, Sheet, and
Alloy Tube
Strip
B649 Specification for Ni-Fe-Cr-Mo-Cu-N Low-Carbon Al-
B464/B464M Specification for Welded UNS N08020 Alloy
loy and Cr-Ni-Fe-N Low-Carbon Alloy Bar and Wire,
Pipe
Ni-Cr-Fe-Mo-N Alloy Wire, and Ni-Fe-Cr-Mo-N Alloy
B468 Specification for Welded UNS N08020 Alloy Tubes
Bar
B472 Specification for Nickel Alloy Billets and Bars for
Reforging B673 Specification for Nickel-Iron-Chromium-
Molybdenum and Iron-Nickel-Chromium-Molybdenum-
B473 Specification for UNS N08020, UNS N08024, and
UNS N08026 Nickel Alloy Bar and Wire Copper Welded Pipe
B366/B366M − 23
B674 Specification for Nickel-Iron-Chromium- 2.5 ASNT:
Molybdenum and Iron-Nickel-Chromium-Molybdenum- SNT-TC-1A Recommended Practice for Nondestructive
Copper Welded Tube Testing Personnel Qualification and Certification
B675 Specification for Iron-Nickel-Chromium-
3. Terminology
Molybdenum Alloy Welded Pipe
B676 Specification for UNS N08367 Welded Tube
3.1 Terms defined in Terminology B899 shall apply unless
B677 Specification for Nickel-Iron-Chromium-
otherwise defined in this standard.
Molybdenum and Iron-Nickel-Chromium-Molybdenum-
Copper Seamless Pipe and Tube
4. Ordering Information
B688 Specification for Chromium-Nickel-Molybdenum-
4.1 It is the responsibility of the purchaser to specify all
Iron Plate, Sheet, and Strip
requirements that are necessary for material ordered under this
B690 Specification for Iron-Nickel-Chromium-
specification. Examples of such requirements include, but are
Molybdenum Alloy Seamless Pipe and Tube
not limited to, the following:
B691 Specification for Iron-Nickel-Chromium-
4.1.1 Quantity, number of fittings of each kind,
Molybdenum Alloy (UNS N08367) Rod, Bar, and Wire
4.1.2 Description of Fitting and Nominal Dimensions (stan-
B704 Specification for Welded Nickel Alloy Tubes
dard or special),
B705 Specification for Nickel-Alloy (UNS N06625, N06219
4.1.3 Alloy Composition,
and N08825) Welded Pipe
4.1.4 Condition (temper) if applicable.
B710 Specification for Nickel-Iron-Chromium-Silicon Alloy
4.1.5 If neither grade of N06625 is specified, Grade 1 will
Welded Pipe
be supplied.
B729 Specification for Seamless Nickel-Iron-Chromium-
4.1.6 For each Grade of WP fittings ordered, a Class should
Molybdenum-Copper Nickel Alloy Pipe and Tube
also be indicated.
B880 Specification for General Requirements for Chemical
4.1.6.1 Grade CR fittings shall not be substituted for fittings
Check Analysis Limits for Nickel, Nickel Alloys and
ordered to Grade WP, but Grade WP may be substituted for
Cobalt Alloys
Grade CR.
B899 Terminology Relating to Non-ferrous Metals and Al-
4.1.6.2 For all Classes of WP fittings, unless S, W, WX, or
loys
WU is specified by the purchaser, any class may be furnished
E165 Practice for Liquid Penetrant Testing for General
at the option of the supplier.
Industry
4.1.7 Purchaser Inspection—State which tests or inspec-
E1916 Guide for Identification of Mixed Lots of Metals
tions are to be witnessed (Section 10),
2.2 ASME Standards:
4.1.8 Samples for Product (Check Analysis)—State whether
B16.9 Wrought Steel Butt Welding Fittings
samples should be furnished (6.3),
B16.11 Forged Steel Fittings, Socket-Welding and Threaded
4.1.9 Test reports (Section 12), and
2.3 Manufacturers Standardization Society of the Valve and
4.1.10 Supplementary requirements, if any.
Fittings Industry Standards:
MSS SP-25 Standard Marking Systems for Valves, Fittings,
5. Materials and Manufacture
Flanges, and Unions
5.1 Material—The material for wrought welding fittings
MSS SP-43 Standard Practice for Light Weight Stainless
may consist of forgings, rods, bars, plates, sheets, and seamless
Steel Butt Welding Fittings
or welded pipe that conform to all the requirements of the
MSS SP-95 Sewage (D) Nipples and Bull Plugs
ASTM specifications for the particular product and alloy
MSS SP-97 Forged Carbon Steel Branch Outlet Fittings-
referred to in Table 2.
–Socket Welding, Threaded and Butt Welding Ends
5.2 Manufacture:
Boiler and Pressure Vessel Code, Section VIII, Division
5.2.1 Forging or shaping operations may be performed by
1 Pressure Vessels and Section IX, Welding Qualifica-
hammering, pressing, piercing, extruding, upsetting, rolling,
tions
5 bending, or fusion welding, or by a combination of two or more
2.4 AWS Standards:
of these operations. The forming procedure shall be so applied
A5.11 Specification for Nickel and Nickel Alloy Covered
that it will not produce injurious defects in the fittings.
Welding Electrodes
5.2.2 Grade WP fittings ordered as Class S shall be of
A5.14 Specification for Nickel and Nickel-Alloy Bare Weld-
seamless construction and shall meet all requirements of
ing Rods and Electrodes
ASME B16.9 or B16.11.
5.2.3 All classes of fittings shall have the welders, welding
operators, and welding procedures qualified under the provi-
Available from American Society of Mechanical Engineers (ASME), ASME
International Headquarters, Two Park Ave., New York, NY 10016-5990, http:// sions of Section IX of the ASME Boiler and Pressure Vessel
www.asme.org.
Code.
Available from Manufacturers Standardization Society of the Valve and Fittings
Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-
hq.com.
5 6
Available from American Welding Society (AWS), 550 NW LeJeune Rd., Available from American Society for Nondestructive Testing (ASNT), P.O. Box
Miami, FL 33126, http://www.aws.org. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
B366/B366M − 23
TABLE 2 Permissible Raw Materials
A B
Marking Product and ASTM Designation
Corrosion- Plate, Bar Forging
ASME Pressure UNS
Resistant Alloy Pipe or Tube Sheet, and Forging
Fittings Designation
Fittings or Strip Stock
CRN WPN Ni N02200 B161 B162 B160, B564
CRNL WPNL Ni, Low C N02201 B161 B162 B160
C C
CRNC WPNC Ni-Cu N04400 B165 B127 B164, B564
CR HX WPHX Ni-Cr-Mo-Fe N06002 B619/B619M, B622, B626 B435 B572
CR HG WPHG Ni-Cr-Fe-Mo-Cu N06007 B619/B619M, B622, B626 B582 B581
CR HC 22 WPHC22 Low C-Ni-Mo-Cr N06022 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRV602 WPV602 Ni-Cr-Fe N06025 B163, B167 B168 B166, B462, B472
CR HG 30 WPHG30 Ni-Cr-Fe-Mo-Cu N06030 B619/B619M, B622, B626 B582 B581, B462, B472
CRHG35 WPHG35 Ni-Cr-Mo N06035 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CR MC WPHMC Ni-Cr-Mo N06044 B619/B619M, B622, B626 B575 B574, B564
CRV45TM WPV45TM Ni-Cr-Fe N06045 B163, B167 B168 B166, B462, B472
CR2120 WP2120 Ni-Cr-Mo low C N06058 B619/B619M, B622, B626 B575 B564, B574
CR5923 WP5923 Low C-Ni-Cr-Mo N06059 B619/B619M, B622, B626 B575 B564, B574, B462,
B472
CR HC 2000 WPHC2000 Low C-Ni-Cr-Mo-Cu N06200 B619/B619M, B622, B626 B575 B564, B574, B462,
B472
CRM21 WPM21 Low C-Ni-Cr-Mo-Ta N06210 B619/B619M, B622, B626 B575 B564, B574
CR626Si WP626Si Ni-Cr-Mo-Si N06219 B444, B704, B705 B443 B446, B564
CRH230 WPH230 Ni-Cr-W-Mo N06230 B619/B619M, B622, B626 B435 B572, B564
CRHR235 WPHR235 Ni-Cr-Mo-Cu N06235 B167, B619/B619M, B626 B168 B166
CR HC 4 WPHC4 Low C-Ni-Mo-Cr N06455 B619/B619M, B622, B626 B575 B574
CRNCI WPNCI Ni-Cr-Fe N06600 B167, B516, B517 B168 B166, B564
CR603GT WP603GT Ni-Cr-Fe-Al N06603 B163, B167, B516, B517 B168 B166, B564
CRNCMC WPNCMC Ni-Cr-Mo-Cb N06625 B444, B704, B705 B443 B446, B564
CRIN686 WPIN686 Low C-Ni-Cr-Mo N06686 B163, B619/B619M, B622, B575 B564, B574, B462,
B626 B472
CRV699 WPV699 Ni-Cr-Al N06699 B163, B167, B516 B168 B166, B462, B472,
B564
CR HG3 WPHG3 Ni-Cr-Fe-Mo-Cu N06985 B619/B619M, B622, B626 B582 B581
CR20CB WP20CB Cr-Ni-Fe-Mo-Cu-Cb N08020 B464/B464M, B468, B729 B463 B472, B473, B462
stabilized
CR3127 WP3127 Low C-Ni-Fe-Cr- N08031 B619/B619M, B622, B626 B625 B564, B649, B462,
Mo-Cu B472
CRH120 WPH120 Ni-Cr-Fe N08120 B407, B514, B515 B409 B408, B564
CR330 WP330 Ni-Fe-Cr-Si N08330 B535, B710 B536 B511, B512
CR6XN WP6XN Fe-Ni-Cr-Mo-N N08367 B675, B676, B690 B688 B472, B564, B691,
B462
CRNIC WPNIC Ni-Fe-Cr N08800 B407, B514, B515 B409 B408, B564
CRNIC10 WPNIC10 Ni-Fe-Cr N08810 B407, B514, B515 B409 B408, B564
CRNIC11 WPNIC11 Ni-Fe-Cr N08811 B407 B409 B408, B564
CRNICMC WPNICMC Ni-Fe-Cr-Mo-Cu N08825 B423, B704, B705 B424 B425, B564
CR1925 WP1925 Low C-Ni-Fe-Cr- N08925 B673, B674, B677 B625 B649
Mo-Cu
CR1925N WP1925N Low C-Ni-Fe-Cr-Mo- N08926 B673, B674, B677 B625 B649
Cu-N
CR HB WPHB Ni-Mo N10001 B619/B619M, B622, B626 B333 B335
CR HN WPHN Ni-Mo-Cr-Fe N10003 B434 B573
CR H242 WPH242 Ni-Mo-Cr-Fe N10242 B619/B619M, B622, B626 B434 B573, B564
CR HC 276 WPHC276 Low C-Ni-Mo-Cr N10276 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRHBC1 WPHBC1 Low C-Ni-Mo-Cr N10362 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRB10 WPB10 Low C-Ni-Mo-Cr-Fe N10624 B619/B619M, B622, B626 B333 B335, B564
CRVB4 WPVB4 Ni-Mo N10629 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CR HB2 WPHB-2 Ni-Mo N10665 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CR HB3 WPHB–3 Ni-Mo N10675 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CRH160 WPH160 Ni-Co-Cr-Si N12160 B619/B619M, B622, B626 B435 B564, B572
CR3033 WP3033 Low C-Cr-Ni-Fe-N R20033 B619/B619M, B622, B626 B625 B564, B649, B472,
B462
CRH556 WPH556 Ni-Fe-Cr-Co R30556 B619/B619M, B622, B626 B435 B572
A
When WP fittings are of welded construction or made from welded pipe, the symbol shall be supplemented with W or WX as applicable. If ultrasonic examination in
accordance with 5.2.4.2 or 5.2.5.1 is used, the symbol shall be supplemented by WU or WXU as applicable.
B
See 2.1 and 5.1.
C
Yield strength shall be 25 000 psi (172 MPa) min, for all hot-formed, annealed fittings made from WPNC material.
B366/B366M − 23
5.2.4 Grade WP fittings ordered as Class W shall meet the 5.2.10.3 Repair of areas in the weld is permitted, but
requirements of ASME B16.9 and shall have all pipe welds 5.2.10.1 and 5.2.10.2 must be repeated.
made by the starting material manufacturer or the fitting 5.2.10.4 Fittings shall be marked with the symbol WBU
manufacturer with the addition of filler radiographically exam- following the alloy designation (for example: WPN-WBU).
5.2.11 Stubends may be produced with the entire lap added
ined throughout the entire length in accordance with Paragraph
UW-51 of Section VIII, Division 1, of the ASME Boiler and as weld metal to a straight pipe section provided the welding
satisfies the requirements of 5.2.3 for qualifications and 5.3 for
Pressure Vessel Code, except as exempt by 5.2.4.1, and 5.2.4.2.
heat treatment.
5.2.4.1 The weld in the starting pipe, made to one of the
5.2.11.1 Grade WP****Class W – Radiographic examina-
pipe or tube product specifications listed in Table 2, shall not
tion of the welds, made with the addition of filler metal, is
require radiography, provided that no filler metal is used in
required. See 5.2.4.
making the weld.
5.2.11.2 Grade WP****Class WX – Radiographic exami-
5.2.4.2 Instead of the radiographic examination, and at the
nation of all welds, made with or without the addition of filler
option of the manufacturer, welds made by the fitting manu-
metal is required. See 5.2.5.
facturer may be ultrasonically examined in accordance with the
5.2.11.3 Grade WP****Class WU – Ultrasonic examina-
Code requirements stated in 5.2.6.
tion of all welds, made with or without the addition of filler
5.2.5 Grade WP fittings ordered as Class WX shall meet the
metal, is required. See 5.2.6.
requirements of ASME B16.9 and shall have all welds, whether
5.2.11.4 Grade CR – Nondestructive examination is not
made by the fitting manufacturer or the starting material
required. See 5.2.8.
manufacturer, radiographically examined throughout their en-
5.2.12 Stubends may be produced with the entire lap added
tire length in accordance with Paragraph UW-51 of Section
by the welding of a ring, made from plate or flat bar of the
VIII, Division 1, of the ASME Boiler and Pressure Vessel
same alloy grade and composition, to the outside of a straight
Code, except as exempt by 5.2.5.1. The radiography for this
section of pipe, provided the weld is a double welded full
class of fittings may be done either prior to or after forming at
penetration joint and satisfies the requirements of 5.2.3 for
the o
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: B366/B366M − 20 B366/B366M − 23
Standard Specification for
Factory-Made Wrought Nickel and Nickel Alloy Fittings
This standard is issued under the fixed designation B366/B366M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers wrought welding fittings for pressure piping, factory-made from nickel and nickel alloys. Threaded
fittings as covered in ASME B16.11 are also covered by this specification. The term welding applies to butt-welding or
socket-welding parts such as 45° and 90° elbows, 180° bends, caps, tees, reducers, lap-joint stub ends, and other types, as covered
by ASME B16.9, ASME B16.11, MSS SP-43, MSS SP-95, and MSS SP-97.
1.1.1 Several grades of nickel and nickel alloys are included in this specification. Grades are designated with a prefix, WP or CR,
based on the applicable ASME or MSS dimensional and rating standards.
1.1.2 Class WP fittings are those manufactured to the requirements of ASME B16.9, B16.11.
1.1.3 For each of the WP nickel and nickel alloy grades, several classes of fittings are covered to indicate whether seamless or
welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of
nondestructive examination (NDE). Table 1 is general summary of the fitting classes applicable to all WP grades of nickel and
nickel alloys covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.
1.2 This specification does not apply to cast welding fittings.
1.3 Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. These
supplementary requirements call for additional tests. When desired, one or more of these may be specified in the order.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet
(SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental
practices, and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.07 on Refined
Nickel and Cobalt and Their Alloys.
Current edition approved Oct. 1, 2020April 1, 2023. Published October 2020April 2023. Originally approved in 1961. Last previous edition approved in 20192020 as
B366/B366M – 19.B366/B366M – 20. DOI: 10.1520/B0366_B0366M-20.10.1520/B0366_B0366M-23.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B366/B366M − 23
TABLE 1 Fitting Classes for WP Grades
Class Construction Nondestructive Examination
S Seamless None
W Welded Radiography or Ultrasonic
WX Welded Radiography
WU Welded Ultrasonic
2. Referenced Documents
2.1 ASTM Standards:
B127 Specification for Nickel-Copper Alloy Plate, Sheet, and Strip
B160 Specification for Nickel Rod and Bar
B161 Specification for Nickel Seamless Pipe and Tube
B162 Specification for Nickel Plate, Sheet, and Strip
B163 Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes
B164 Specification for Nickel-Copper Alloy Rod, Bar, and Wire
B165 Specification for Nickel-Copper Alloy Seamless Pipe and Tube
B166 Specification for Nickel-Chromium-Aluminum Alloy, Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-
Molybdenum Alloy, Nickel-Iron-Chromium-Tungsten Alloy, and Nickel-Chromium-Molybdenum-Copper Alloy Rod, Bar,
and Wire
B167 Specification for Standard Specification for Nickel-Chromium-Aluminum Alloys (UNS N06699) Nickel-Chromium-Iron
Alloys (UNS N06600, N06601, N06603, N06690, N06693, N06025, N06045, and N06696) Nickel-Chromium-Cobalt-
Molybdenum Alloy (UNS N06617) Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674) and Nickel-Chromium-
Molybdenum-Copper Alloy (UNS N06235) Seamless Pipe and Tube
B168 Specification for Nickel-Chromium-Aluminum Alloys (UNS N06699), Nickel-Chromium-Iron Alloys (UNS N06600,
N06601, N06603, N06690, N06693, N06025, N06045, and N06696), Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS
N06617), Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674), and
B333 Specification for Nickel-Molybdenum Alloy Plate, Sheet, and Strip
B335 Specification for Nickel-Molybdenum Alloy Rod
B407 Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube
B408 Specification for Nickel-Iron-Chromium Alloy Rod and Bar
B409 Specification for Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip
B423 Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Seamless Pipe and Tube
B424 Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloys Plate, Sheet, and Strip
B425 Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloys Rod and Bar
B434 Specification for Nickel-Molybdenum-Chromium-Iron Alloys Plate, Sheet, and Strip
B435 Specification for Heat and Corrosion Resistant High Temperature Alloy Plate, Sheet, and Strip
B443 Specification for Nickel-Chromium-Molybdenum-Columbium Alloy and Nickel-Chromium-Molybdenum-Silicon Alloy
Plate, Sheet, and Strip
B444 Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-
Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
B446 Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625), Nickel-Chromium-Molybdenum-
Silicon Alloy (UNS N06219), and Nickel-Chromium-Molybdenum-Tungsten Alloy (UNS N06650) Rod and Bar
B462 Specification for Forged or Rolled Nickel Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive
High-Temperature Service
B463 Specification for UNS N08020 Alloy Plate, Sheet, and Strip
B464/B464M Specification for Welded UNS N08020 Alloy Pipe
B468 Specification for Welded UNS N08020 Alloy Tubes
B472 Specification for Nickel Alloy Billets and Bars for Reforging
B473 Specification for UNS N08020, UNS N08024, and UNS N08026 Nickel Alloy Bar and Wire
B511 Specification for Nickel-Iron-Chromium-Silicon Alloy Bars and Shapes
B512 Specification for Nickel-Chromium-Silicon Alloy Billets and Bars
B514 Specification for Welded Nickel-Iron-Chromium Alloy Pipe
B515 Specification for Welded Nickel-Iron-Chromium Alloy Tubes
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
B366/B366M − 23
B516 Specification for Welded Nickel-Chromium-Aluminum Alloy (UNS N06699) and Nickel-Chromium-Iron Alloy (UNS
N06600, UNS N06601, UNS N06603, UNS N06025, UNS N06045, UNS N06690, and UNS N06693) Tubes
B517 Specification for Welded Nickel-Chromium-Iron-Alloy Pipe
B535 Specification for Nickel-Iron-Chromium-Silicon Alloys (UNS N08330 and N08332) Seamless Pipe and Tube
B536 Specification for Nickel-Iron-Chromium-Silicon Alloys Plate, Sheet, and Strip
B564 Specification for Nickel Alloy Forgings
B572 Specification for UNS N06002, UNS N06230, UNS N12160, and UNS R30556 Rod
B573 Specification for Nickel-Molybdenum-Chromium-Iron Alloys (UNS N10003, N10242) Rod
B574 Specification for Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon Nickel-Molybdenum-Chromium, Low-
Carbon Nickel-Molybdenum-Chromium-Tantalum, Low-Carbon Nickel-Chromium-Molybdenum-Copper, and Low-Carbon
Nickel-Chromium-Molybdenum-Tungsten Alloy Rod
B575 Specification for Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon Nickel-Chromium-Molybdenum-Copper,
Low-Carbon Nickel-Chromium-Molybdenum-Tantalum, Low-Carbon Nickel-Chromium-Molybdenum-Tungsten, and Low-
Carbon Nickel-Molybdenum-Chromium Alloy Plate, Sheet, and Strip
B581 Specification for Nickel-Chromium-Iron-Molybdenum-Copper Alloy Rod
B582 Specification for Nickel-Chromium-Iron-Molybdenum-Copper Alloy Plate, Sheet, and Strip
B619/B619M Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe
B622 Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube
B625 Specification for Ni-Fe-Cr-Mo-Cu-N Low-Carbon Alloy, Ni-Fe-Cr-Si Alloy, Cr-Ni-Fe-N Low-Carbon Alloy, Fe-Ni-Cr-
Mo-Cu-N Alloy, and Ni-Fe-Cr-Mo-N Alloy Plate, Sheet, and Strip
B626 Specification for Welded Nickel and Nickel-Cobalt Alloy Tube
B649 Specification for Ni-Fe-Cr-Mo-Cu-N Low-Carbon Alloy and Cr-Ni-Fe-N Low-Carbon Alloy Bar and Wire, Ni-Cr-Fe-
Mo-N Alloy Wire, and Ni-Fe-Cr-Mo-N Alloy Bar
B673 Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Pipe
B674 Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Tube
B675 Specification for Iron-Nickel-Chromium-Molybdenum Alloy Welded Pipe
B676 Specification for UNS N08367 Welded Tube
B677 Specification for Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Seamless Pipe
and Tube
B688 Specification for Chromium-Nickel-Molybdenum-Iron Plate, Sheet, and Strip
B690 Specification for Iron-Nickel-Chromium-Molybdenum Alloy Seamless Pipe and Tube
B691 Specification for Iron-Nickel-Chromium-Molybdenum Alloy (UNS N08367) Rod, Bar, and Wire
B704 Specification for Welded Nickel Alloy Tubes
B705 Specification for Nickel-Alloy (UNS N06625, N06219 and N08825) Welded Pipe
B710 Specification for Nickel-Iron-Chromium-Silicon Alloy Welded Pipe
B729 Specification for Seamless Nickel-Iron-Chromium-Molybdenum-Copper Nickel Alloy Pipe and Tube
B880 Specification for General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys
B899 Terminology Relating to Non-ferrous Metals and Alloys
E165 Practice for Liquid Penetrant Testing for General Industry
E1916 Guide for Identification of Mixed Lots of Metals
2.2 ASME Standards:
B16.9 Wrought Steel Butt Welding Fittings
B16.11 Forged Steel Fittings, Socket-Welding and Threaded
2.3 Manufacturers Standardization Society of the Valve and Fittings Industry Standards:
MSS SP-25 Standard Marking Systems for Valves, Fittings, Flanges, and Unions
MSS SP-43 Standard Practice for Light Weight Stainless Steel Butt Welding Fittings
MSS SP-95 Sewage (D) Nipples and Bull Plugs
MSS SP-97 Forged Carbon Steel Branch Outlet Fittings–Socket Welding, Threaded and Butt Welding Ends
Boiler and Pressure Vessel Code, Section VIII, Division 1 Pressure Vessels and Section IX, Welding Qualifications
2.4 AWS Standards:
A5.11 Specification for Nickel and Nickel Alloy Covered Welding Electrodes
A5.14 Specification for Nickel and Nickel-Alloy Bare Welding Rods and Electrodes
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, ThreeTwo Park Ave., New York, NY 10016-5990,
http://www.asme.org.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-hq.com.
Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126, http://www.aws.org.
B366/B366M − 23
2.5 ASNT:
SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification
3. Terminology
3.1 Terms defined in Terminology B899 shall apply unless otherwise defined in this standard.
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this
specification. Examples of such requirements include, but are not limited to, the following:
4.1.1 Quantity, number of fittings of each kind,
4.1.2 Description of Fitting and Nominal Dimensions (standard or special),
4.1.3 Alloy Composition,
4.1.4 Condition (temper) if applicable.
4.1.5 If neither grade of N06625 is specified, Grade 1 will be supplied.
4.1.6 For each Grade of WP fittings ordered, a Class should also be indicated.
4.1.6.1 Grade CR fittings shall not be substituted for fittings ordered to Grade WP, but Grade WP may be substituted for Grade
CR.
4.1.6.2 For all Classes of WP fittings, unless S, W, WX, or WU is specified by the purchaser, any class may be furnished at the
option of the supplier.
4.1.7 Purchaser Inspection—State which tests or inspections are to be witnessed (Section 10),
4.1.8 Samples for Product (Check Analysis)—State whether samples should be furnished (6.3),
4.1.9 Test reports (Section 12), and
4.1.10 Supplementary requirements, if any.
5. Materials and Manufacture
5.1 Material—The material for wrought welding fittings may consist of forgings, rods, bars, plates, sheets, and seamless or welded
pipe that conform to all the requirements of the ASTM specifications for the particular product and alloy referred to in Table 2.
5.2 Manufacture:
5.2.1 Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending,
or fusion welding, or by a combination of two or more of these operations. The forming procedure shall be so applied that it will
not produce injurious defects in the fittings.
5.2.2 Grade WP fittings ordered as Class S shall be of seamless construction and shall meet all requirements of ASME B16.9 or
B16.11.
5.2.3 All classes of fittings shall have the welders, welding operators, and welding procedures qualified under the provisions of
Section IX of the ASME Boiler and Pressure Vessel Code.
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
B366/B366M − 23
TABLE 2 Permissible Raw Materials
A B
Marking Product and ASTM Designation
Corrosion- Plate, Bar Forging
ASME Pressure UNS
Resistant Alloy Pipe or Tube Sheet, and Forging
Fittings Designation
Fittings or Strip Stock
CRN WPN Ni N02200 B161 B162 B160, B564
CRNL WPNL Ni, Low C N02201 B161 B162 B160
C C
CRNC WPNC Ni-Cu N04400 B165 B127 B164, B564
CR HX WPHX Ni-Cr-Mo-Fe N06002 B619/B619M, B622, B626 B435 B572
CR HG WPHG Ni-Cr-Fe-Mo-Cu N06007 B619/B619M, B622, B626 B582 B581
CR HC 22 WPHC22 Low C-Ni-Mo-Cr N06022 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRV602 WPV602 Ni-Cr-Fe N06025 B163, B167 B168 B166, B462, B472
CR HG 30 WPHG30 Ni-Cr-Fe-Mo-Cu N06030 B619/B619M, B622, B626 B582 B581, B462, B472
CRHG35 WPHG35 Ni-Cr-Mo N06035 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CR MC WPHMC Ni-Cr-Mo N06044 B619/B619M, B622, B626 B575 B574, B564
CRV45TM WPV45TM Ni-Cr-Fe N06045 B163, B167 B168 B166, B462, B472
CR2120 WP2120 Ni-Cr-Mo low C N06058 B619/B619M, B622, B626 B575 B564, B574
CR5923 WP5923 Low C-Ni-Cr-Mo N06059 B619/B619M, B622, B626 B575 B564, B574, B462,
B472
CR HC 2000 WPHC2000 Low C-Ni-Cr-Mo-Cu N06200 B619/B619M, B622, B626 B575 B564, B574, B462,
B472
CRM21 WPM21 Low C-Ni-Cr-Mo-Ta N06210 B619/B619M, B622, B626 B575 B564, B574
CR626Si WP626Si Ni-Cr-Mo-Si N06219 B444, B704, B705 B443 B446, B564
CRH230 WPH230 Ni-Cr-W-Mo N06230 B619/B619M, B622, B626 B435 B572, B564
CRHR235 WPHR235 Ni-Cr-Mo-Cu N06235 B167, B619/B619M, B626 B168 B166
CR HC 4 WPHC4 Low C-Ni-Mo-Cr N06455 B619/B619M, B622, B626 B575 B574
CRNCI WPNCI Ni-Cr-Fe N06600 B167, B516, B517 B168 B166, B564
CR603GT WP603GT Ni-Cr-Fe-Al N06603 B163, B167, B516, B517 B168 B166, B564
CRNCMC WPNCMC Ni-Cr-Mo-Cb N06625 B444, B704, B705 B443 B446, B564
CRIN686 WPIN686 Low C-Ni-Cr-Mo N06686 B163, B619/B619M, B622, B575 B564, B574, B462,
B626 B472
CRV699 WPV699 Ni-Cr-Al N06699 B163, B167, B516 B168 B166, B462, B472,
B564
CR HG3 WPHG3 Ni-Cr-Fe-Mo-Cu N06985 B619/B619M, B622, B626 B582 B581
CR20CB WP20CB Cr-Ni-Fe-Mo-Cu-Cb N08020 B464/B464M, B468, B729 B463 B472, B473, B462
stabilized
CR3127 WP3127 Low C-Ni-Fe-Cr- N08031 B619/B619M, B622, B626 B625 B564, B649, B462,
Mo-Cu B472
CRH120 WPH120 Ni-Cr-Fe N08120 B407, B514, B515 B409 B408, B564
CR330 WP330 Ni-Fe-Cr-Si N08330 B535, B710 B536 B511, B512
CR6XN WP6XN Fe-Ni-Cr-Mo-N N08367 B675, B676, B690 B688 B472, B564, B691,
B462
CRNIC WPNIC Ni-Fe-Cr N08800 B407, B514, B515 B409 B408, B564
CRNIC10 WPNIC10 Ni-Fe-Cr N08810 B407, B514, B515 B409 B408, B564
CRNIC11 WPNIC11 Ni-Fe-Cr N08811 B407 B409 B408, B564
CRNICMC WPNICMC Ni-Fe-Cr-Mo-Cu N08825 B423, B704, B705 B424 B425, B564
CR1925 WP1925 Low C-Ni-Fe-Cr- N08925 B673, B674, B677 B625 B649
Mo-Cu
CR1925N WP1925N Low C-Ni-Fe-Cr-Mo- N08926 B673, B674, B677 B625 B649
Cu-N
CR HB WPHB Ni-Mo N10001 B619/B619M, B622, B626 B333 B335
CR HN WPHN Ni-Mo-Cr-Fe N10003 B434 B573
CR H242 WPH242 Ni-Mo-Cr-Fe N10242 B619/B619M, B622, B626 B434 B573, B564
CR HC 276 WPHC276 Low C-Ni-Mo-Cr N10276 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRHBC1 WPHBC1 Low C-Ni-Mo-Cr N10362 B619/B619M, B622, B626 B575 B574, B564, B462,
B472
CRB10 WPB10 Low C-Ni-Mo-Cr-Fe N10624 B619/B619M, B622, B626 B333 B335, B564
CRVB4 WPVB4 Ni-Mo N10629 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CR HB2 WPHB-2 Ni-Mo N10665 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CR HB3 WPHB–3 Ni-Mo N10675 B619/B619M, B622, B626 B333 B335, B564, B462,
B472
CRH160 WPH160 Ni-Co-Cr-Si N12160 B619/B619M, B622, B626 B435 B564, B572
CR3033 WP3033 Low C-Cr-Ni-Fe-N R20033 B619/B619M, B622, B626 B625 B564, B649, B472,
B462
CRH556 WPH556 Ni-Fe-Cr-Co R30556 B619/B619M, B622, B626 B435 B572
A
When WP fittings are of welded construction or made from welded pipe, the symbol shall be supplemented with W or WX as applicable. If ultrasonic examination in
accordance with 5.2.4.2 or 5.2.5.1 is used, the symbol shall be supplemented by WU or WXU as applicable.
B
See 2.1 and 5.1.
C
Yield strength shall be 25 000 psi (172 MPa) min, for all hot-formed, annealed fittings made from WPNC material.
B366/B366M − 23
5.2.4 Grade WP fittings ordered as Class W shall meet the requirements of ASME B16.9 and shall have all pipe welds made by
the starting material manufacturer or the fitting manufacturer with the addition of filler radiographically examined throughout the
entire length in accordance with Paragraph UW-51 of Section VIII, Division 1, of the ASME Boiler and Pressure Vessel Code,
except as exempt by 5.2.4.1, and 5.2.4.2.
5.2.4.1 The weld in the starting pipe, made to one of the pipe or tube product specifications listed in Table 2, shall not require
radiography, provided that no filler metal is used in making the weld.
5.2.4.2 Instead of the radiographic examination, and at the option of the manufacturer, welds made by the fitting manufacturer may
be ultrasonically examined in accordance with the Code requirements stated in 5.2.6.
5.2.5 Grade WP fittings ordered as Class WX shall meet the requirements of ASME B16.9 and shall have all welds, whether made
by the fitting manufacturer or the starting material manufacturer, radiographically examined throughout their entire length in
accordance with Paragraph UW-51 of Section VIII, Division 1, of the ASME Boiler and Pressure Vessel Code, except as exempt
by 5.2.5.1. The radiography for this class of fittings may be done either prior to or after forming at the option of the manufacturer.
5.2.5.1 Instead of the radiographic examination, and at the option of the manufacturer, welds, whether made by the fitting
manufacturer or the starting material manufacturer, may be ultrasonically examined in accordance with the Code requirements
stated in 5.2.6.
5.2.6 Grade WP fittings ordered as Class WU shall meet the requirements of ASME B16.9 and shall have all welds, whether made
by the fitting manufacturer of the starting material manufacturer, ultrasonically examined throughout their entire length in
accordance with Appendix 12 of Section VIII, Division 1, of the ASME Boiler and Pressure Vessel Code. The ultrasonic
examination of welds for this class may be performed either prior to or after forming at the option of the manufacturer.
5.2.7 Personnel performing NDE examinations shall be qualified in accordance with SNT-TC-1A.
5.2.8 Fittings covered in MSS SP-43, MSS SP-95, or MSS SP-97 and ordered as CR*** shall meet the requirements of MSS
SP-43, MSS SP-95, or MSS SP-97, respectively, and do not require non-destructive examination.
5.2.9 All joints welded with filler metal shall be finished in accordance with the requirements of Paragraph UW-35 (a) of Section
VIII, Division 1, of the ASME Boiler and Pressure Vessel Code.
5.2.10 Weld buildup is permitted to dimensionally correct unfilled areas produced during forming of stub ends. Radiographic
examination of the weld buildup on cold-formed stub ends shall not be required provided that all o
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