ASTM B423-22

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: B423 − 11 (Reapproved 2021) B423 − 22
Standard Specification for
Nickel-Iron-Chromium-Molybdenum-Copper Alloy
(UNS N08825, N08221, and N06845) Seamless Pipe and
Tube
This standard is issued under the fixed designation B423; 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 Scope*
2 3
1.1 This specification covers nickel-iron-chromium-molybdenum-copper alloys (UNS N08825, N08221, and N06845) in the
form of cold-worked and hot-finished seamless pipe and tube intended for general corrosive service. The general requirements for
pipe and tube are covered in Specification B829.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 The following precautionary caveat pertains only to the test methods portion, Section 9, of this specification: 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.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
B829 Specification for General Requirements for Nickel and Nickel Alloys Seamless Pipe and Tube
3. General Requirement
3.1 Material furnished under this specification shall conform to the applicable requirements of Specification B829 unless otherwise
provided herein.
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 June 1, 2021April 1, 2022. Published June 2021April 2022. Originally approved in 1964. Last previous edition approved in 20162021 as
B423B423 – 11 (2021). – 11 (2016). DOI: 10.1520/B0423-11R21.DOI: 10.1520/B0423-22.
For ASME Boiler and Pressure Vessel Code applications see related specification SB-423 in Section II of that code.
New designation established in accordance with Practice E527 and SAE J 1086, Practice for Numbering Metals and Alloys (UNS).
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.
*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
B423 − 22
4. Ordering Information
4.1 It is the responsibility of the purchaser to specify all requirements that are necessary for the safe and satisfactory performance
of material ordered under this specification. Examples of such requirements include, but are not limited to, the following:
4.1.1 Alloy name or UNS number,
4.1.2 ASTM designation,
4.1.3 Condition (see Appendix X2X1),
4.1.4 Finish (see Appendix X2X1),
4.1.5 Dimensions:
4.1.5.1 Tube—Specify outside diameter and nominal or minimum wall,
4.1.5.2 Pipe—Specify standard pipe size and schedule,
4.1.5.3 Length—Cut to length or random,
4.1.6 Quantity—Feet (or metres) or number of pieces,
4.1.7 Hydrostatic Test or Nondestructive Electric Test—Specify type of test (see 6.2).
4.1.8 Hydrostatic Pressure Requirements—Specify test pressure if other than required by 9.1.1,
4.1.9 Certification—State if certification is required,
4.1.10 Samples for Product (Check) Analysis—State whether samples for product (check) analysis should be furnished (see 5.2),
4.1.11 Purchaser Inspection—If purchaser wishes to witness tests or inspection of material at place of manufacture, the purchase
order must so state indicating which tests or inspections are to be witnessed, and
4.1.12 Small-Diameter Tube and Light-Wall Tube Tube with Specified Wall Thickness 3 % or Less of the Specified Outside
Diameter (Converter Sizes)—See Appendix X1Annex A1.
5. Chemical Composition
5.1 The material shall conform to the composition limits specified in Table 1. One test is required for each lot as defined in
Specification B829.
A
TABLE 1 Chemical Requirements
Element UNS N08825 UNS N08221 UNS N06845
Nickel 38.0–46.0 39.0–46.0 44.0–50.0
Chromium 19.5–23.5 20.0–22.0 20.0–25.0
B B B
Iron 22.0 min 22.0 min remainder
Manganese 1.0 1.0 0.5
Carbon 0.05 0.025 0.05
Copper 1.5–3.0 1.5–3.0 2.0–4.0
Silicon 0.5 0.5 0.5
Sulfur 0.03 0.03 0.010
Aluminum 0.2 0.2 .
Titanium 0.6–1.2 0.6–1.0 .
Molybdenum 2.5–3.5 5.0–6.5 5.0–7.0
Tungsten . . 2.0–5.0
A
Maximum unless range or minimum is given. Where ellipses (.) appear in this table, there is no requirement and analysis for the element need not be determined or
reported.
B
Element shall be determined arithmetically by difference.
B423 − 22
TABLE 2 Mechanical Properties of Pipe and Tube
Yield Strength Elongation in
Tensile Strength, 0.2 % Offset, min, 2 in. or 50
Alloy Condition and Size
min, ksi (MPa) ksi (MPa) mm (4D),
min,%
UNS N08825 hot-finished annealed 75 (517) 25 (172) 30
UNS N08825 cold-worked annealed 85 (586) 35 (241) 30
A A A
UNS N08825 hot-forming quality (hot-finished or cold-drawn
annealed)
UNS N08221 cold-finished, annealed 79 (545) 34 (234) 30
UNS N06845 cold-finished, annealed 100 (690) 40 (276) 30
A
Hot-forming quality is furnished to chemical requirements and surface inspection only. No mechanical properties are required.
5.2 If a product (check) analysis is performed by the purchaser, the material shall conform to the product (check) analysis
variations of Specification B829.
6. Mechanical Properties and Other Requirements
6.1 Tension Test—The material shall conform to the tensile properties specified in Table 2. The sampling and specimen preparation
are as covered in Specification B829.
6.1.1 Tensile When specified by the purchaser, tensile properties for material specified as small-diameter tube and light-wall tube
tube with specified wall thickness 3 % or less of the specified outside diameter (converter sizes) shall be as prescribed in Table
X1.1A1.1.
6.2 Hydrostatic or Nondestructive Electric Test—Each pipe or tube shall be subjected to either the hydrostatic test or the
nondestructive electric test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the
purchase order.
7. Dimensions and Permissible Variations
7.1 Diameter and Wall Thickness—The permissible variations in the outside diameter and wall thickness shall conform to the
permissible variations prescribed in Tables 3, 4, and 5 of Specification B829.
7.2 Permissible When specified by the purchaser, permissible variations for material specified as small-diameter tube and
light-wall tube tube with specified wall thickness 3 % or less of the specified outside diameter (converter size) shall conform to
the permissible variations prescribed in Table X1.2A1.2.
8. Number of Tests
8.1 Chemical Analysis—One test per lot.
8.2 Tension—One test per lot.
8.3 Hydrostatic or Nondestructive Electric Test—Each piece in each lot.
9. Test Methods
9.1 Hydrostatic Test—Each pipe or tube with an outside diameter ⁄8 in. (3 mm) and larger and with wall thickness of 0.015 in.
(0.38 mm) and over shall be tested in accordance with Specification B829. The allowable fiber stress, for material in the condition
furnished, is as follows:
UNS N08825 hot finished, annealed: 16 600 psi (114 MPa)
UNS N08825 cold-worked, annealed: 21 200 psi (146 MPa)
UNS N08221 cold finished, annealed: 19 700 psi (138 MPa)
B423 − 22
9.1.1 When so agreed upon between the manufacturer and purchaser, pipe or tube may be tested to 1 ⁄2 times the allowable fiber
stress given in 9.1.
9.1.2 If any pipe or tube shows leaks during hydrostatic testing, it shall be rejected.
9.2 Nondestructive Electric Test—Each pipe or tube shall be examined with a nondestructive electric test i
...