ASTM A860/A860M-22

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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: A860/A860M − 18 A860/A860M − 22
Standard Specification for
Wrought High-Strength Ferritic Steel Butt-Welding Fittings
This standard is issued under the fixed designation A860/A860M; 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 high-strength ferritic steel butt-welding fittings of seamless and electric fusion-welded
construction. Dimensions of the fittings are provided in the latest revisions of ASME B16.9 and MSS-SP-75. Butt-welding fittings
differing from ASME B16.9 shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M.
These fittings are for use in high-pressure gas and oil transmission and distribution systems.
1.2 Optional supplementary requirements are provided for fittings when a greater degree of examination is desired. One or more
of the supplementary requirements may be specified in the order.
1.3 This specification does not cover cast-welding fittings or fittings machined from castings.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two systems may result in non-conformance with the standard. Unless the
order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
1.5 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:
A751 Test Methods and Practices for Chemical Analysis of Steel Products
A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings
2.2 ASME Standards:
B16.9 Steel Butt-Welding Fittings
2.3 ASME Boiler and Pressure Vessel Code:
Section V
Section VIII Division 1
Section IX
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.22
on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.
Current edition approved May 1, 2018Nov. 1, 2022. Published May 2018November 2022. Originally approved in 1986. Last previous edition approved in 20142018 as
A860/A860M – 14.A860/A860M – 18. DOI: 10.1520/A0860_A0860M-18.10.1520/A0860_A0860M-22.
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.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
*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
A860/A860M − 22
2.4 MSS Standards:
MSS SP-25 The Standard Marking System of Valves, Fittings, Flanges and Unions
MSS-SP-75 Specification for High Test Wrought Butt-Welding Fittings
2.5 American Society of Nondestructive Testing:
SNT-TC-1A Recommended Practice for Nondestructive Testing Personnel Qualification and Certification
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 Barlow’s Formula—relates the internal pressure that a pipe can withstand to its dimensions and the strength of its materials.
3.1.1.1 Discussion—
The formula is given in 15.2.
3.2 Definitions—For definitions of other terms used in this specification refer to Specification A960/A960M.
4. Ordering Information
4.1 In addition to the requirements of See Specification A960/A960M, the following ordering information applies:.
3.1.1 Grade Symbol,
3.1.2 Requirements for certification of test report.
5. General Requirements
5.1 Product furnished to this specification shall conform to the requirements of Specification A960/A960M, including any
supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of
Specification A960/A960M constitutes nonconformance with this specification. In case of conflict between the requirements of this
specification and Specification A960/A960M, this specification shall prevail.
6. Materials and Manufacture
6.1 The materialsteel for fittings shall be fully killed fine-grain material made by a melting process that is intended to produce
rounded, well dispersed, fine sulphide inclusions, that promote good notch toughness, assists in the resistance to hydrogen induced
cracking, and for weldability suitable for field welding. killed steel melted in accordance with a fine grain practice. The steel shall
be made by the electric arc furnace, induction melt furnace or basic oxygen furnace melting processes. These melting processes
may be followed by additional refining in a ladle metallurgy furnace (LMF). Secondary melting by vacuum-arc remelting (VAR)
or electroslag remelting (ESR) may be used.
6.1.1 The melting practice used is intended to produce rounded, well dispersed, fine sulphide inclusions. This practice promotes
good notch toughness, assists in the resistance to hydrogen induced cracking, and results in weldability suitable for field welding.
6.2 Starting materials shall consist of plate, sheet, forgings, forging quality bar, and seamless or fusion-welded tubular products
with filler metal added. The chemical composition shall conform to Table 1.
6.3 A starting material that specifically requires the addition of any element beyond those listed in Table 1 is not permitted. This
does not preclude the use of deoxidizers.
6.4 Starting material shall not require a preheat for field welding provided that the restrictions of ASME Boiler and Pressure Vessel
Code, Section VIII, Paragraph UW-30 are complied with.
6.5 Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsetting, rolling, bending,
fusion, welding, machining, or by a combination of these operations.
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 Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
A860/A860M − 22
TABLE 1 Chemical Requirements
Composition %
Heat
Analysis
A
Carbon 0.20
Manganese 1.00–1.45 All values are
Phosphorus 0.030 maximum unless
Sulfur 0.010 a range is stated
B
Silicon 0.15–0.40
C
Nickel 0.50
C
Chromium 0.30
C
Molybdenum 0.25
C
Copper 0.35
Titanium 0.05
Vanadium 0.10
D
Niobium 0.04
Vanadium plus 0.12
Niobium
Aluminum 0.06
A
The carbon equivalent, as calculated by the following formula, shall not exceed
0.42 %:
Mn Cr1Mo1V Ni1Cu
CE 5C1 1 1
6 5 15
B
If vacuum carbon deoxidation is used, silicon shall not exceed 0.10 % by heat
analysis and 0.12 % by product analysis.
C
The sum of Ni + Cr + Mo + Cu shall not exceed 1.0 %.
D
Niobium and columbium are interchangeable names for the same element and
both names are acceptable for use in A01.22 specifications.
6.6 All welds including welds in tubular products from which the fittings are made shall be:
6.6.1 Made by welders, welding operators, and welding procedures qualified under the provisions of ASME Boiler and Pressure
Vessel Code, Section IX.
6.6.2 Heat treated in accordance with Section 67 of this specification, and
6.6.3 Radiographically examined throughout the entire length of each weld in accordance with Articles 1 and 2 of ASME Boiler
and Pressure Vessel Code, Section V with acceptance limits in accordance with Paragraph UW-51 of ASME Boiler and Pressure
Vessel Code, Section VIII.
6.7 The welded joints of the fittings shall be furnished in accordance with the requirements of Paragraph UW-35(a) of ASME
Boiler and Pressure Vessel Code, Section VIII.
6.8 All butt-weld tees manufactured by cold-forming methods shall be liquid penetrant or magnetic particle examined by one of
the methods specified in Supplementary Requirements S69 or S70 of Specification A960/A960M. This examination shall be
performed in accordance with a written procedure and shall be performed after final heat treatment. Only the side wall area of the
tees need be examined. This area is defined by a circle that covers the area from the weld bevel of the branch outlet to the center
line of the body or run. Internal and external surfaces shall be examined when size permits accessibility. No cracks shall be
permitted. Other imperfections shall be treated in accordance with 12.113.1 on finish. After the removal of any cracks, the tees shall
be re-examined by the original method. Acceptable tees shall be marked with the symbol PT or MT, as applicable, to indicate
compliance. NDE personnel shall be qualified in accordance with SNT-TC-1A.
6.9 All caps machined from bar stock shall be examined by liquid penetrant or magnetic particle in accordance with
Supplementary Requirements S69 or S70 of Specification A960/A960M, and with personnel qualifications, acceptance criteria, and
marking as in 5.86.8.
7. Heat Treatment
7.1 All fittings shall be furnished in the heat-treated condition. Fittings formed above the transformation temperature or upon
A860/A860M − 22
which welding is performed, shall be cooled to below the lower critical temperature prior to heat treatment. Fittings shall
subsequently be heat treated by normalizing, quenching, and tempering or stress relieving in accordance with Specification
A960/A960M.
8. Chemical Composition
8.1 The chemical composition of the steel shall conform to the requirements prescribed in Table 1.
8.2 The steel shall not contain any unspecified elements for the ordered grade to the extent that it conforms to the requirements
of another grade for which that element is a specified element having a required minimum content.
8.3 Analysis of each heat of steel shall be made from a sample taken preferably during the pouring of the heat. The results shall
A heat analysis shall conform to Table 1 for either heat or Specification .A960/A960M for product analysis limits as applicable.
8.4 The fittings manufacturer shall make a product analysis per heat from either the starting material or from a fitting. The
chemical composition thus determined shall conform to Table 1 within the permissible variations included in Specification
A960/A960M. The product analysis shall be the basis for rejection. For referee purposes, Test Methods, Practices, and Terminology
A751 shall apply.
8.5 The carbon equivalent of the base metal, as determined by the following formula, shall not exceed 0.42 % for the product
analysis:
Mn Cr1Mo1V Ni1Cu
CE 5 C1 1 1
6 5 15
8.6 Weld metal used in the construction of the fittings shall conform to the tensile and impact requirements of 9.410.4 and 8.19.1
after heat treatment in accordance with Section 67. A chemical analysis shall be performed on dep
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