1、Designation: A 860/A 860M 08Standard 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, ASME B16.28, and MSS-SP-75. Butt-welding fittingsdiffering from these ASME and MSS standards shall befurnished in accordance with Supplementary Requirement S58of Specification A 960/A 960M. These fittings are for use inhigh-pres
4、sure gas and oil transmission and distribution sys-tems.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 fitti
5、ngs orfittings machined from castings.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe used independently
6、 of the other. Combining values from thetwo systems may result in nonconformance with this specifi-cation. Unless the order specifies the applicable “M” specifi-cation designation (SI units), the material shall be furnished toinch-pound units.2. Referenced Documents2.1 ASTM Standards:2A 370 Test Met
7、hods and Definitions 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 FittingsB16.28 Wrought Stee
8、l Buttwelding Short Radius Elbowsand Returns2.3 ASME Boiler and Pressure Vessel 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
9、 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 Information3.1 In addition to the requirements of Specification A 96
10、0/A 960M, 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 A 960/A 960M, includingany supplementary requirements that
11、are indicated in thepurchase order. Failure to comply with the general require-ments 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
12、. 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 jurisdiction of ASTM Committee A01 on Steel,Stainless
13、 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 approved Nov. 1, 2008. Published December 2008. Originallyapproved in 1986.
14、Last previous edition approved in 2005 as A 860/A 860M 00(2005).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, refer to the standards Document Summary page onthe ASTM websi
15、te.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 Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, htt
16、p:/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 this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
17、hohocken, PA 19428-2959, United States.good 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 tubularproducts with f
18、iller 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 Starting material shall not require a preheat for fieldwe
19、lding 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,bending, fusion, welding, machining, or by a combination ofthe
20、se 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, Section IX,5.6.2 Heat treated in accordance with Section 6 o
21、f 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 ofASME Boiler and Pressure Vessel Code, Section VIII.5.7 The
22、 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 penetrant or magnetic particle examined byone of the methods sp
23、ecified in Supplementary RequirementsS69 or S70 of Specification A 960/A 960M. 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 be examined. This area is defined by acircle that covers
24、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 accordance with 12.1 on finish. After the removal of anycracks,
25、 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 stock shall be examined byliquid penetrant or magnetic par
26、ticle in accordance withSupplementary Requirements S69 or S70 of SpecificationA 960/A 960M, and 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 tempe
27、rature 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 SpecificationA 960/A 960M.7. Chemical Composition7.1 The
28、 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 that element is aspecified element having a required mi
29、nimum 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 SpecificationA 960/A 960M for product analysis limits as applicable.7.4 The fittings manufacturer shall make a product a
30、nalysisper 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 TerminologyA 751 shall apply.7.5 The carbon equivalent of the
31、 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 construction of the fittings shallconform to the tensile and impact requirements of 9.4 and 8.1after heat treatment in accordance with Sect
32、ion 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 of flux. The weld metal shall be depositedin accordance with the qualified weld procedure.TABLE 1 Chemical RequirementsComposition %Heat
33、AnalysisCarbon 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 equivalent, as calculate
34、d 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 %.A 860/A 860M 0827.7 Only the carbon content
35、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 listed in Table 2. The testing sha
36、llbe performed in accordance with Test Methods and DefinitionsA 370. Full size Charpy, V-notch 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 heattrea
37、tment. All base metal specimens shall be removed with theaxis of the specimens longitudinal to 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 a
38、nd 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 test specimens shal
39、l 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 heat treated in either
40、 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 heat of fillermetal
41、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 requirementof Tabl
42、e 2.10. Hardness Requirements10.1 Fittings shall have a maximum hardness of 22 HRC(235 HB).11. Dimensions11.1 Dimensional requirements for NPS 14 and smallerbutt-welding fittings are provided inASME B16.9 and B16.28.11.2 Dimensional requirements for butt-welding fittingslarger than NPS 14 through NP
43、S 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 accordance with Supplemen-tary Requirement S58 of Specification A 960/A 960M.11.4 Fittings that do not have a
44、 thickness or yield strength,or both, that are equal to the mating pipe, are acceptableTABLE 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 strength, ksi MPa 60 415 63 43
45、5 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 full section;min, % in 2
46、 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, ftlbsJ Lateral Expansion min, MLSmm103 10 30/25 40/34 25 0.64103 7.5 25/21 34/2
47、8 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 deduction of 1.5 % from the elongation value of specimens above516 in. 7.94mm is permitted. When the
48、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 of specimen.CThese requirements are intended to minimize fracture initiation. The requirements a
49、re not intended to give assurance against fracture propagation.A 860/A 860M 083provided 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 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
