1、Designation: A 860/A 860M 09Standard Specification forWrought High-Strength Ferritic Steel Butt-Welding Fittings1This standard is issued under the fixed designationA 860/A 860M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the y
2、ear 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 f
3、usion-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 SpecificationA 960/A 960M. These fittings are for use in high-pressure gasand
4、 oil 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 orfitting
5、s machined 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 o
6、ther. 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:2A 370 Test Methods and Definit
7、ions for Mechanical Testingof Steel ProductsA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsA 960/A 960M Specification for Common Requirementsfor Wrought Steel Piping Fittings2.2 ASME Standards:3B16.9 Steel Butt-Welding Fittings2.3 ASME Boiler and Pressure Vessel
8、 Code:3Section V Nondestructive ExaminationSection VIII Division 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 Ameri
9、can Society of Nondestructive Testing:5SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel Qualification and Certification3. Ordering Information3.1 In addition to the requirements of Specification A 960/A 960M, the following ordering information applies:3.1.1 Grade Symbol,3.1.2 Requi
10、rements for certification of test report.4. General Requirements4.1 Product furnished to this specification shall conform tothe requirements of Specification A 960/A 960M, includingany supplementary requirements that are indicated in thepurchase order. Failure to comply with the general require-ment
11、s of Specification A 960/A 960M constitutes nonconfor-mance with this specification. In case of conflict between therequirements of this specification and Specification A 960/A 960M, this specification shall prevail.5. Materials and Manufacture5.1 The material for fittings shall be fully killed fine
12、-grainmaterial made by a melting process that is intended to producerounded, well dispersed, fine sulphide inclusions, that promote1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 on
13、 Steel Forgings and Wrought Fittings for PipingApplications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved May 1, 2009. Published May 2009. Originallyapproved in 1986. Last previous edition approved in 2008 as A 860/A 860M 08.2For referenced ASTM standards,
14、 visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquart
15、ers, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.4Available from Manufacturers Standardization Society 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, 1
16、711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.1*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.good notch toughness, assists in the resistance to hydro
17、geninduced 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 tubularproducts with filler metal added. The chemical compositionshall conform to Table 1.5.3 Astarting material that
18、 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 Starting material shall not require a preheat for fieldwelding provided that the restrictions of ASME Boiler andPressure Vessel Code, Section VIII, Para
19、graph UW-30 arecomplied with.5.5 Forging or shaping operations 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
20、 shall be:5.6.1 Made by welders, welding operators, and weldingprocedures 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 wel
21、d in accordance with Articles 1 and 2 ofASME Boiler and Pressure 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 Paragra
22、ph 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 penetrant or magnetic particle examined byone of the methods specified in Supplementary RequirementsS69 or S70 of Specification A 960/A 960M. This examination
23、shall be performed in accordance with a written procedure andshall 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. Interna
24、l and externalsurfaces shall be examined when size permits accessibility. 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
25、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 stock shall be examined byliquid penetrant or magnetic particle in accordance withSupplementary Requirements S69 or S70 of SpecificationA 960/A 960M, and
26、 with personnel qualifications, acceptancecriteria, and marking as 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 temperatur
27、e prior to heat treatment. Fittings shallsubsequently be heat treated by normalizing, quenching, andtempering or stress relieving in accordance with SpecificationA 960/A 960M.7. Chemical Composition7.1 The chemical composition of the steel shall conform tothe requirements prescribed in Table 1.7.2 T
28、he steel shall not contain any unspecified elements forthe ordered 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 du
29、ring the pouring of the heat. Theresults shall conform to Table 1 for either heat or SpecificationA 960/A 960M 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 th
30、us determined shall conform to Table1. The product analysis shall be the basis for rejection. Forreferee purposes, Test Methods, Practices, and TerminologyA 751 shall apply.7.5 The carbon equivalent of the base metal, as determinedby the following formula, shall not exceed 0.42 % for theproduct anal
31、ysis:CE 5 C 1Mn61Cr 1 Mo 1 V51Ni 1 Cu157.6 Weld metal used in the construction 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 met
32、al or, for submerged arc welding, each heat offiller metal and batch of flux. The weld metal shall be depositedin accordance with the qualified weld procedure.TABLE 1 Chemical RequirementsComposition %HeatAnalysisCarbon 0.20AManganese 1.001.45 All values arePhosphorus 0.030 maximum unlessSulfur 0.01
33、0 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 equivalent, as calculated by the following formula, shall not exceed0.42 %:CE 5 C 1Mn61Cr 1 Mo 1 V51Ni 1 Cu15BIf vacuum
34、 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 %.A 860/A 860M 0927.7 Only the carbon content of the deposited weld-metalcomposition need comply with the requirements of Table 1.The nickel
35、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 listed in Table 2. The testing shallbe performed in accordance with Test Methods and DefinitionsA 370. Full size Charpy, V-notch
36、specimens shall be usedwhenever possible. Small size specimens shall be used onlywhen the material thickness does not permit full size speci-mens. The impact specimens shall not be flattened after heattreatment. All base metal specimens shall be removed with theaxis of the specimens longitudinal to
37、the direction of primarymetal flow. Weld-metal specimens shall be specimens with theaxis transverse 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 tensiontes
38、ts.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 test specimens shall be taken from a fitting afterfinal heat treatment or from a test piece of the same heat andno
39、minal 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 heat treated in either a continuousor batch-type furnace, controlled within a range of 50 F 28C and equipped with rec
40、ording 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 heat of fillermetal and batch of flux for submerged arc welds, for fittings ofthe same section thickness and heat t
41、reated 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 requirementof Table 2.10. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC(235 HB).11.
42、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 are provided by MSS-SP-75.11.3 Fittings of a size or shape differing from the standardsin 11.1 and 1
43、1.2, but meeting all the other requirements of thisspecification, may be furnished in accordance with Supplemen-tary Requirement S58 of Specification A 960/A 960M.11.4 Fittings that do not have a thickness or yield strength,or both, that are equal to the mating pipe, are acceptableTABLE 2 Mechanical
44、 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 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 specim
45、en, 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 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 m
46、m. Width of specimen 112 in. 40mm.BBBBBBToughness:Cvenergy absorptionC; measured at 50 F 46 C.Size, 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
47、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. 7.94mm is permitted. When the section thickness lies between two values defined above, the minimum elongation value is determined by th
48、e following equation:E 5 48t 1 15.00where:E = elongation % in 2 in. 50 mm, andt = actual thickness of specimen.CThese requirements are intended to minimize fracture initiation. The requirements are not intended to give assurance against fracture propagation.A 860/A 860M 093provided the welding end p
49、reparations 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 strength of the pipe and the minimumtested yield strength of the fitting.12. Workmanship, Finish and Appearance12.1 The requirements of Specification A 960/A 960M ap-ply except as modified as follows: The wall thickness at allpoints shall be at least 9312 % of the specified
