1、Designation: A860/A860M 10Standard 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 V Nondestructive ExaminationSection VIII Division 1, Pressure Ves
8、selsSection 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 Practice for Nondes
9、tructiveTesting 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.4. General Requirements4.1 Product furnis
10、hed to this specification shall conform tothe requirements of Specification A960/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 ca
11、se of conflict between the requirementsof this specification and Specification A960/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,
12、fine sulphide inclusions, that promotegood 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 bar, and seamless or fusion-welded tubular1This specificat
13、ion is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and 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 approv
14、ed Nov. 1, 2010. Published December 2010. Originallyapproved in 1986. Last previous edition approved in 2009 as A860/A860M09.DOI: 10.1520/A0860_A0860M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMS
15、tandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from Manufacturers Standardization Soc
16、iety of the Valve and FittingsIndustry (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.1*A Summary of Changes section appears at the end of
17、 this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.products with filler metal added. The chemical compositionshall conform to Table 1.5.3 Astarting material that specifically requires the additionof any element beyond thos
18、e listed in Table 1 is not permitted.This does not preclude the use of deoxidizers.5.4 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 operation
19、s may be performed byhammering, pressing, piercing, extruding, upsetting, rolling,bending, 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 weldi
20、ngprocedures qualified under the provisions of ASME Boiler andPressure Vessel Code, Section 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 Press
21、ure Vessel Code, Section V withacceptance limits in accordance with Paragraph UW-51 ofASME 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 V
22、III.5.8 All butt-weld tees manufactured by cold-forming meth-ods shall be liquid penetrant 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 andsh
23、all be performed after final heat treatment. Only the side wallarea of the tees need be 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 acce
24、ssibility. Nocracks shall be permitted. Other imperfections shall be treatedin accordance 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 pers
25、onnel shall bequalified in accordance with SNT-TC-1A.5.9 All caps machined from bar stock 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 a
26、s in 5.8.6. Heat Treatment6.1 All fittings shall be furnished in the heat-treated condi-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 tre
27、ated by normalizing, quenching, andtempering or stress relieving in accordance with SpecificationA960/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
28、grade to the extent that it conforms to therequirements of another grade for which that 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 f
29、or either heat or SpecificationA960/A960M for product analysis limits as applicable.7.4 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
30、the basis for rejection. Forreferee purposes, Test Methods, Practices, and TerminologyA751 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 C 1Mn61Cr 1 Mo 1 V51Ni 1 Cu157.6 Weld metal used in the cons
31、truction of the fittings shallconform to the tensile and impact requirements of 9.4 and 8.1after heat treatment in accordance with Section 6. A chemicalanalysis shall be performed on deposited weld metal for eachheat of filler metal or, for submerged arc welding, each heat offiller metal and batch o
32、f flux. The weld metal shall be depositedin accordance with the qualified weld procedure.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 %.TABLE 1 Chemical RequirementsC
33、omposition %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 0.06AThe carbon equivale
34、nt, as calculated by the following formula, shall not exceed0.42 %:CE 5 C 1Mn61Cr 1 Mo 1 V51Ni 1 Cu15BIf vacuum carbon deoxidation is used, silicon shall not exceed 0.10 % by heatanalysis and 0.12 % by product analysis.CThe sum of Ni + Cr + Mo + Cu shall not exceed 1.0 %.A860/A860M 1028. Notch Tough
35、ness Properties8.1 The notch toughness properties of the fittings shallconform to the requirements listed 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 whe
36、n thematerial thickness does not permit full size specimens. Theimpact specimens shall not be flattened 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 axi
37、s trans-verse to the weld seam.8.2 One set of impact tests (three specimens) shall be madeto represent 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
38、properties of the fitting material shall con-form to the requirements listed in Table 2.9.2 Tension 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 repres
39、ent.9.3 One tensile test is required for each heat of fittings of thesame section thickness, and heat 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
40、 tension test made with the axis transverse to theweld seam for each heat of filler metal, or each heat 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 F
41、28 C and equipped with recording pyrometers. Only theultimate tensile strength need meet the minimum requirementof Table 2.10. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC(235 HBW).11. Dimensions11.1 Dimensional requirements for NPS 14 and smallerbutt-welding fittings a
42、re provided in ASME B16.9.11.2 Dimensional requirements for butt-welding fittingslarger than NPS 14 through NPS 48 are 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
43、 accordance with Supplemen-tary 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 acceptableprovided the welding end preparations comply with MSS-SP-75, Figs. 3(a), (b), and (c) and the fitting wel
44、ding-end thicknessis at least equal to the pipe wall thickness times the ratio of thespecified minimum yield strength of the pipe and the minimumtested yield strength of the fitting.TABLE 2 Mechanical RequirementsProperty GradeWPHY 42 WPHY 46 WPHY 52 WPHY 60 WPHY 65 WPHY 70Yield strength, minA0.2 %
45、offset, ksi MPa 42 290 46 315 52 360 60 415 65 450 70 485Tensile strength, 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 secti
46、on thickness516 in. 7.94mm and over, and for all small sizes tested in 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,
47、mm Average/min, ftlbsJ Lateral Expansion min, MLSmm103 10 30/25 40/34 25 0.64103 7.5 25/21 34/28 21 0.53103 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 deduct
48、ion of 1.5 % from the elongation value of specimens above516 in. 7.94mm is permitted. When the section thickness lies between two values defined above, the minimum elongation value is determined by the following equation:E 5 48t 1 15.00where:E = elongation % in 2 in. 50 mm, andt = actual thickness o
49、f specimen.CThese requirements are intended to minimize fracture initiation. The requirements are not intended to give assurance against fracture propagation.A860/A860M 10312. Workmanship, Finish and Appearance12.1 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 wallthickness, and the diameters at all points shall be within thespecified limits.12
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