1、Designation: A860/A860M 14Standard 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 revision, the year
2、 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 ferriticsteel butt-welding fittings of seamless and electric fusi
3、on-welded construction covered by the latest revisions of ASMEB16.9 and MSS-SP-75. Butt-welding fittings differing fromthese ASME and MSS standards shall be furnished in accor-dance with Supplementary Requirement S58 of SpecificationA960/A960M. These fittings are for use in high-pressure gasand oil
4、transmission and distribution systems.1.2 Optional supplementary requirements are provided forfittings when a greater degree of examination is desired. One ormore of the supplementary requirements may be specified inthe order.1.3 This specification does not cover cast-welding fittings orfittings mac
5、hined from castings.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other.
6、 Combining valuesfrom the two systems may result in non-conformance with thestandard. Unless the order specifies the applicable “M” speci-fication designation (SI units), the material shall be furnishedto inch-pound units.2. Referenced Documents2.1 ASTM Standards:2A751 Test Methods, Practices, and T
7、erminology for Chemi-cal Analysis of Steel ProductsA960/A960M Specification for Common Requirements forWrought Steel Piping Fittings2.2 ASME Standards:3B16.9 Steel Butt-Welding Fittings2.3 ASME Boiler and Pressure Vessel Code:3Section VSection VIII Division 1Section IX2.4 MSS Standards:4MSS SP-25 Th
8、e 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 Practice for NondestructiveTesting Personnel Qualification and Certification3. Ordering Information
9、3.1 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.4. General Requirements4.1 Product furnished to this specification shall conform tothe requirements of Specification A960
10、/A960M, including anysupplementary requirements that are indicated in the purchaseorder. Failure to comply with the general requirements ofSpecification A960/A960M constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specification and Specification A
11、960/A960M, thisspecification shall prevail.5. Materials and Manufacture5.1 The material for fittings shall be fully killed fine-grainmaterial made by a melting process that is intended to producerounded, well dispersed, fine sulphide inclusions, that promote1This specification is under the jurisdict
12、ion of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is the direct responsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for PipingApplications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved Oct. 1, 2014. Published
13、October 2014. Originallyapproved in 1986. Last previous edition approved in 2013 as A860/A860M13.DOI: 10.1520/A0860_A0860M-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information,
14、 refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from Manufacturers Standardization Society of the Valve and Fittings
15、Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.5Available fromAmerican Society for Nondestructive Testing (ASNT), P.O. Box28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM In
16、ternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1good notch toughness, assists in the resistance to hydrogeninduced cracking, and for weldability suitable for field weld-ing.5.2 Starting materials shall consist of plate, sheet, forgings,forging quality
17、 bar, and seamless or fusion-welded tubularproducts with filler metal added. The chemical compositionshall conform to Table 1.5.3 Astarting material that specifically requires the additionof any element beyond those listed in Table 1 is not permitted.This does not preclude the use of deoxidizers.5.4
18、 Starting material shall not require a preheat for fieldwelding provided that the restrictions of ASME Boiler andPressure Vessel Code, Section VIII, Paragraph UW-30 arecomplied with.5.5 Forging or shaping operations may be performed byhammering, pressing, piercing, extruding, upsetting, rolling,bend
19、ing, fusion, welding, machining, or by a combination ofthese operations.5.6 All welds including welds in tubular products fromwhich the fittings are made shall be:5.6.1 Made by welders, welding operators, and weldingprocedures qualified under the provisions of ASME Boiler andPressure Vessel Code, Se
20、ction IX.5.6.2 Heat treated in accordance with Section 6 of thisspecification, and5.6.3 Radiographically examined throughout the entirelength of each weld in accordance with Articles 1 and 2 ofASME Boiler and Pressure Vessel Code, Section V withacceptance limits in accordance with Paragraph UW-51 of
21、ASME Boiler and Pressure Vessel Code, Section VIII.5.7 The welded joints of the fittings shall be furnished inaccordance with the requirements of Paragraph UW-35(a) ofASME Boiler and Pressure Vessel Code, Section VIII.5.8 All butt-weld tees manufactured by cold-forming meth-ods shall be liquid penet
22、rant or magnetic particle examined byone of the methods specified in Supplementary RequirementsS69 or S70 of Specification A960/A960M. This examinationshall be performed in accordance with a written procedure andshall be performed after final heat treatment. Only the side wallarea of the tees need b
23、e examined. This area is defined by acircle that covers the area from the weld bevel of the branchoutlet to the center line of the body or run. Internal and externalsurfaces shall be examined when size permits accessibility. Nocracks shall be permitted. Other imperfections shall be treatedin accorda
24、nce with 12.1 on finish. After the removal of anycracks, the tees shall be re-examined by the original method.Acceptable tees shall be marked with the symbol PT or MT, asapplicable, to indicate compliance. NDE personnel shall bequalified in accordance with SNT-TC-1A.5.9 All caps machined from bar st
25、ock shall be examined byliquid penetrant or magnetic particle in accordance withSupplementary Requirements S69 or S70 of SpecificationA960/A960M, and with personnel qualifications, acceptancecriteria, and marking as in 5.8.6. Heat Treatment6.1 All fittings shall be furnished in the heat-treated cond
26、i-tion. Fittings formed above the transformation temperature orupon which welding is performed, shall be cooled to below thelower critical temperature prior to heat treatment. Fittings shallsubsequently be heat treated by normalizing, quenching, andtempering or stress relieving in accordance with Sp
27、ecificationA960/A960M.7. Chemical Composition7.1 The chemical composition of the steel shall conform tothe requirements prescribed in Table 1.7.2 The steel shall not contain any unspecified elements forthe ordered grade to the extent that it conforms to therequirements of another grade for which tha
28、t element is aspecified element having a required minimum content.7.3 Analysis of each heat of steel shall be made from asample taken preferably during the pouring of the heat. Theresults shall conform to Table 1 for either heat or SpecificationA960/A960M for product analysis limits as applicable.7.
29、4 The fittings manufacturer shall make a product analysisper heat from either the starting material or from a fitting. Thechemical composition thus determined shall conform to Table1. The product analysis shall be the basis for rejection. Forreferee purposes, Test Methods, Practices, and Terminology
30、A751 shall apply.7.5 The carbon equivalent of the base metal, as determinedby the following formula, shall not exceed 0.42 % for theproduct analysis:CE 5 C1Mn61Cr1Mo1V51Ni1Cu157.6 Weld metal used in the construction of the fittings shallconform to the tensile and impact requirements of 9.4 and 8.1af
31、ter heat treatment in accordance with Section 6. A chemicalTABLE 1 Chemical RequirementsComposition %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
32、.05Vanadium 0.10Columbium 0.04Vanadium plusColumbium0.12Aluminum 0.06AThe carbon equivalent, as calculated by the following formula, shall not exceed0.42 %:CE 5 C1Mn61Cr1Mo1V51Ni1Cu15BIf vacuum carbon deoxidation is used, silicon shall not exceed 0.10 % by heatanalysis and 0.12 % by product analysis
33、.CThe sum of Ni + Cr + Mo + Cu shall not exceed 1.0 %.A860/A860M 142analysis shall be performed on deposited weld metal for eachheat of filler metal or, for submerged arc welding, each heat offiller metal and batch of flux. The weld metal shall be depositedin accordance with the qualified weld proce
34、dure.7.7 Only the carbon content of the deposited weld-metalcomposition need comply with the requirements of Table 1.The nickel content of the deposited weld metal shall not exceed1.0 %.8. Notch Toughness Properties8.1 The notch toughness properties of the fittings shallconform to the requirements l
35、isted in Table 2. The testing shallbe performed as specified in Specification A960/A960M. Fullsize Charpy, V-notch specimens shall be used wheneverpossible. Small size specimens shall be used only when thematerial thickness does not permit full size specimens. Theimpact specimens shall not be flatte
36、ned after heat treatment.Allbase metal specimens shall be removed with the axis of thespecimens longitudinal to the direction of primary metal flow.Weld-metal specimens shall be specimens with the axis trans-verse to the weld seam.8.2 One set of impact tests (three specimens) shall be madeto represe
37、nt the base metal and one set (three specimens) torepresent the weld metal on the same frequency as the tensiontests.8.3 The test temperature shall be 50 F 46 C.9. Tensile Requirements9.1 The tensile properties of the fitting material shall con-form to the requirements listed in Table 2.9.2 Tension
38、test specimens shall be taken from a fitting afterfinal heat treatment or from a test piece of the same heat andnominal thickness that was heat treated in a furnace chargewith the fittings they represent.9.3 One tensile test is required for each heat of fittings of thesame section thickness, and hea
39、t treated in either a continuousor batch-type furnace, controlled within a range of 50 F 28C and equipped with recording pyrometers.9.4 In addition, fittings containing welds shall have onecenter-weld tension test made with the axis transverse to theweld seam for each heat of filler metal, or each h
40、eat of fillermetal and batch of flux for submerged arc welds, for fittings ofthe same section thickness and heat treated in either a continu-ous or batch-type furnace controlled within a range of 50 F28 C and equipped with recording pyrometers. Only theultimate tensile strength need meet the minimum
41、 requirementof Table 2.10. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC(235 HBW).TABLE 2 Mechanical RequirementsProperty GradeWPHY 42 WPHY 46 WPHY 52 WPHY 60 WPHY 65 WPHY 70Yield strength, minA0.2 % offset, ksi MPa 42 290 46 315 52 360 60 415 65 450 70 485Tensile streng
42、th, ksi MPa 60 415 63 435 66 455 75 515 77 530 80 55085 585 88 605 91 625 100 690 102 705 105 725Elongation:Standard round specimen, or small-size proportionalspecimen, min, % in 4D25 25 25 20 20 20Rectangular specimen, for section thickness516 in. 7.94mm and over, and for all small sizes tested in
43、full section;min, % in 2 in. 50 mm.32 32 32 28 28 28Rectangular specimen for thickness less than516 in. 7.94mm; min, % 2 in. 50 mm. Width of specimen 112 in. 40mm.BBBBBBToughness:Cvenergy absorptionC; measured at 50 F 46 C.Size, mm Average/min, ftlbsJLateral Expansion min, MLSmm10 10 30/25 40/34 25
44、0.6410 7.5 25/21 34/28 21 0.5310 5 20/17 27/23 13 0.33AActual yield strength shall not exceed specified minimum by more than 15 ksi 105 MPa.BFor each132-in. 0.79 mm decrease in section thickness below516 in. 7.94 mm, a deduction of 1.5 % from the elongation value of specimens above516 in. 7.94 mmis
45、permitted. When the section thickness lies between two values defined above, the minimum elongation value is determined by the following equation:E 5 48t115.00where:E = elongation % in 2 in. 50 mm, andt = actual thickness of specimen.CThese requirements are intended to minimize fracture initiation.
46、The requirements are not intended to give assurance against fracture propagation.A860/A860M 14311. Dimensions11.1 Dimensional requirements for NPS 14 and smallerbutt-welding fittings are provided in ASME B16.9.11.2 Dimensional requirements for butt-welding fittingslarger than NPS 14 through NPS 48 a
47、re provided by MSS-SP-75.11.3 Fittings of a size or shape differing from the standardsin 11.1 and 11.2, but meeting all the other requirements of thisspecification, may be furnished in accordance with Supplemen-tary Requirement S58 of Specification A960/A960M.11.4 Fittings that do not have a thickne
48、ss or yield strength,or both, that are equal to the mating pipe, are acceptableprovided the welding end preparations comply with MSS-SP-75, Figs. 3(a), (b), and (c) and the fitting welding-end thicknessis at least equal to the pipe wall thickness times the ratio of thespecified minimum yield strengt
49、h of the pipe and the minimumtested yield strength of the fitting.12. Surface Finish, Appearance, and CorrosionProtection12.1 The requirements of Specification A960/A960M applyexcept as modified as follows: The wall thickness at all pointsshall be at least 9312 % of the specified nominal wall thickness,and the diameters at all points shall be within the specifiedlimits.12.2 When the removal of a surface discontinuity reducesthe wall thickness below 9312 %
