1、Designation: A860/A860M 10A860/A860M 13Standard Specification forWrought High-Strength Ferritic Steel Butt-Welding Fittings1This standard is issued under the fixed designation A860/A860M; the number immediately following the designation indicates the yearof original adoption or, in the case of revis
2、ion, 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
3、 electric fusion-weldedconstruction covered by the latest revisions ofASME B16.9 and MSS-SP-75. Butt-welding fittings differing from theseASME andMSS standards shall be furnished in accordance with Supplementary Requirement S58 of Specification A960/A960M. Thesefittings are for use in high-pressure
4、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 moreof the supplementary requirements may be specified in the order.1.3 This specification does not cover cast-welding fittings
5、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 unitsare shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be usedindependen
6、tly of the other. Combining values from the two systems may result in non-conformance with the standard. Unless theorder specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.2. Referenced Documents2.1 ASTM Standards:2A751 Test Methods
7、, Practices, and Terminology for Chemical Analysis of Steel ProductsA960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings2.2 ASME Standards:3B16.9 Steel Butt-Welding Fittings2.3 ASME Boiler and Pressure Vessel Code:3Section V Nondestructive ExaminationSection VIII Divisi
8、on 1, Pressure VesselsSection IX Welding and Brazing Qualifications2.4 MSS Standards:4MSS SP-25 The Standard Marking System of Valves, Fittings, Flanges and UnionsMSS-SP-75 Specification for High Test Wrought Butt-Welding Fittings2.5 American Society of Nondestructive Testing:5SNT-TC-1A Recommended
9、Practice for Nondestructive Testing Personnel Qualification and Certification3. Ordering Information3.1 In addition to the requirements of Specification A960/A960M, the following ordering information applies:3.1.1 Grade Symbol,3.1.2 Requirements for certification of test report.1 This specification
10、is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloysand is the direct responsibility of Subcommittee A01.22on Steel Forgings and Wrought Fittings for Piping Applications and Bolting Materials for Piping and Special Purpose Applications.Current edition approved N
11、ov. 1, 2010Oct. 1, 2013. Published December 2010October 2013. Originally approved in 1986. Last previous edition approved in 20092010as A860/A860M09.10. DOI: 10.1520/A0860_A0860M-10.10.1520/A0860_A0860M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer S
12、ervice at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme
13、.org.4 Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.5 Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.as
14、nt.org.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. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult pr
15、ior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19
16、428-2959. United States14. General Requirements4.1 Product furnished to this specification shall conform to the requirements of Specification A960/A960M, including anysupplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements ofSpecification
17、A960/A960M constitutes nonconformance with this specification. In case of conflict between the requirements of thisspecification and Specification A960/A960M, this specification shall prevail.5. Materials and Manufacture5.1 The material for fittings shall be fully killed fine-grain material made by
18、a melting process that is intended to producerounded, well dispersed, fine sulphide inclusions, that promote good notch toughness, assists in the resistance to hydrogen inducedcracking, and for weldability suitable for field welding.5.2 Starting materials shall consist of plate, sheet, forgings, for
19、ging quality bar, and seamless or fusion-welded tubular productswith filler metal added. The chemical composition shall conform to Table 1.5.3 Astarting material that specifically requires the addition of any element beyond those listed in Table 1 is not permitted. Thisdoes not preclude the use of d
20、eoxidizers.5.4 Starting material shall not require a preheat for field welding provided that the restrictions of ASME Boiler and PressureVessel Code, Section VIII, Paragraph UW-30 are complied with.5.5 Forging or shaping operations may be performed by hammering, pressing, piercing, extruding, upsett
21、ing, rolling, bending,fusion, welding, machining, or by a combination of these operations.5.6 All welds including welds in tubular products from which the fittings are made shall be:5.6.1 Made by welders, welding operators, and welding procedures qualified under the provisions ofASME Boiler and Pres
22、sureVessel Code, Section IX.5.6.2 Heat treated in accordance with Section 6 of this specification, and5.6.3 Radiographically examined throughout the entire length of each weld in accordance withArticles 1 and 2 ofASME Boilerand Pressure Vessel Code, Section V with acceptance limits in accordance wit
23、h Paragraph UW-51 of ASME Boiler and PressureVessel Code, Section VIII.5.7 The welded joints of the fittings shall be furnished in accordance with the requirements of Paragraph UW-35(a) of ASMEBoiler and Pressure Vessel Code, Section VIII.5.8 All butt-weld tees manufactured by cold-forming methods s
24、hall be liquid penetrant or magnetic particle examined by oneof the methods specified in Supplementary Requirements S69 or S70 of Specification A960/A960M. This examination shall beperformed in accordance with a written procedure and shall be performed after final heat treatment. Only the side wall
25、area of thetees need be examined. This area is defined by a circle that covers the area from the weld bevel of the branch outlet to the centerline of the body or run. Internal and external surfaces shall be examined when size permits accessibility. No cracks shall beTABLE 1 Chemical RequirementsComp
26、osition %HeatAnalysisCarbon 0.20AManganese 1.001.45 All values arePhosphorus 0.030 maximum unlessSulfur 0.010 a range is statedSilicon 0.150.40BNickel 0.50CChromium 0.30CMolybdenum 0.25CCopper 0.35CTitanium 0.05Vanadium 0.10Columbium 0.04Vanadium plusColumbium0.12Aluminum 0.06A The carbon equivalent
27、, as calculated by the following formula, shall not exceed0.42 %:CE5C1Mn6 1Cr1Mo1V5 1Ni1Cu15B If vacuum carbon deoxidation is used, silicon shall not exceed 0.10 % by heatanalysis and 0.12 % by product analysis.C The sum of Ni + Cr + Mo + Cu shall not exceed 1.0 %.A860/A860M 132permitted. Other impe
28、rfections shall be treated in accordance with 12.1 on finish. After the removal of any cracks, the tees shallbe re-examined by the original method. Acceptable tees shall be marked with the symbol PT or MT, as applicable, to indicatecompliance. NDE personnel shall be qualified in accordance with SNT-
29、TC-1A.5.9 All caps machined from bar stock shall be examined by liquid penetrant or magnetic particle in accordance withSupplementary Requirements S69 or S70 of Specification A960/A960M, and with personnel qualifications, acceptance criteria, andmarking as in 5.8.6. Heat Treatment6.1 All fittings sh
30、all be furnished in the heat-treated condition. Fittings formed above the transformation temperature or uponwhich welding is performed, shall be cooled to below the lower critical temperature prior to heat treatment. Fittings shallsubsequently be heat treated by normalizing, quenching, and tempering
31、 or stress relieving in accordance with SpecificationA960/A960M.7. Chemical Composition7.1 The chemical composition of the steel shall conform to the requirements prescribed in Table 1.7.2 The steel shall not contain any unspecified elements for the ordered grade to the extent that it conforms to th
32、e requirementsof another grade for which that element is a specified element having a required minimum content.7.3 Analysis of each heat of steel shall be made from a sample taken preferably during the pouring of the heat. The results shallconform to Table 1 for either heat or Specification A960/A96
33、0M for product analysis limits as applicable.7.4 The fittings manufacturer shall make a product analysis per heat from either the starting material or from a fitting. Thechemical composition thus determined shall conform to Table 1. The product analysis shall be the basis for rejection. For refereep
34、urposes, Test Methods, Practices, and Terminology A751 shall apply.7.5 The carbon equivalent of the base metal, as determined by the following formula, shall not exceed 0.42 % for the productanalysis:CE5C1Mn6 1Cr1Mo1V5 1Ni1Cu157.6 Weld metal used in the construction of the fittings shall conform to
35、the tensile and impact requirements of 9.4 and 8.1 afterheat treatment in accordance with Section 6.Achemical analysis shall be performed on deposited weld metal for each heat of fillermetal or, for submerged arc welding, each heat of filler metal and batch of flux. The weld metal shall be deposited
36、 in accordancewith the qualified weld procedure.7.7 Only the carbon content of the deposited weld-metal composition need comply with the requirements of Table 1. The nickelcontent of the deposited weld metal shall not exceed 1.0 %.8. Notch Toughness Properties8.1 The notch toughness properties of th
37、e fittings shall conform to the requirements listed in Table 2. The testing shall beperformed as specified in Specification A960/A960M. Full size Charpy, V-notch specimens shall be used whenever possible. Smallsize specimens shall be used only when the material thickness does not permit full size sp
38、ecimens. The impact specimens shallnot be flattened after heat treatment. All base metal specimens shall be removed with the axis of the specimens longitudinal to thedirection of primary metal flow. Weld-metal specimens shall be specimens with the axis transverse to the weld seam.8.2 One set of impa
39、ct tests (three specimens) shall be made to represent the base metal and one set (three specimens) to representthe weld metal on the same frequency as the tension tests.8.3 The test temperature shall be 50 F 46 C.9. Tensile Requirements9.1 The tensile properties of the fitting material shall conform
40、 to the requirements listed in Table 2.9.2 Tension test specimens shall be taken from a fitting after final heat treatment or from a test piece of the same heat andnominal thickness that was heat treated in a furnace charge with the fittings they represent.9.3 One tensile test is required for each h
41、eat of fittings of the same section thickness, and heat treated in either a continuousor batch-type furnace, controlled within a range of 50 F 28 C and equipped with recording pyrometers.9.4 In addition, fittings containing welds shall have one center-weld tension test made with the axis transverse
42、to the weld seamfor each heat of filler metal, or each heat of filler metal and batch of flux for submerged arc welds, for fittings of the same sectionthickness and heat treated in either a continuous or batch-type furnace controlled within a range of 50 F 28 C and equippedwith recording pyrometers.
43、 Only the ultimate tensile strength need meet the minimum requirement of Table 2.A860/A860M 13310. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC (235 HBW).11. Dimensions11.1 Dimensional requirements for NPS 14 and smaller butt-welding fittings are provided in ASME B16.9.
44、11.2 Dimensional requirements for butt-welding fittings larger than NPS 14 through NPS 48 are provided by MSS-SP-75.11.3 Fittings of a size or shape differing from the standards in 11.1 and 11.2, but meeting all the other requirements of thisspecification, may be furnished in accordance with Supplem
45、entary Requirement S58 of Specification A960/A960M.11.4 Fittings that do not have a thickness or yield strength, or both, that are equal to the mating pipe, are acceptable providedthe welding end preparations comply with MSS-SP-75, Figs. 3(a), (b), and (c) and the fitting welding-end thickness is at
46、 least equalto the pipe wall thickness times the ratio of the specified minimum yield strength of the pipe and the minimum tested yield strengthof the fitting.12. Workmanship, Finish and Appearance12.1 The requirements of Specification A960/A960M apply except as modified as follows: The wall thickne
47、ss at all points shallbe at least 9312 % of the specified nominal wall thickness, and the diameters at all points shall be within the specified limits.12.2 When the removal of a surface discontinuity reduces the wall thickness below 9312 % of the specified nominal wallthickness at any point, the fit
48、ting shall be subject to rejection or to repair as provided in Section 13.13. Repair by Welding (Base Metal)13.1 Repair welding by the manufacturer is permissible in accordance with Specification A960/A960M and the following:13.1.1 The deposited weld metal shall conform to the requirements of 7.5 an
49、d 7.6. Electrodes for the shielded metal-arc processshall be of the low-hydrogen type.13.1.2 After repair welding, sections thicker than 1 in. 25 mm also shall be radiographed in accordance with 5.6.13.1.3 All fittings repaired by welding shall be thermally treated after repair by either complete reheat treatment or post-weldheat treatment at least 50 F 28 C below the tempering temperature if tempering has been performed.TABLE 2 Mechanical RequirementsProperty GradeWPHY 42 WPHY 46 WPHY 52 WPHY 60 WPHY 65 WPHY 70Yield strength, minA 0.2 % offset
