1、Designation: A 860/A 860M 00 (Reapproved 2005)Standard Specification forWrought High-Strength Low-Alloy Steel Butt-WeldingFittings1This 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
2、of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers wrought high-strength low-alloy steel butt-welding fittings of sea
3、mless and electric fusion-welded construction covered by the latest revisions of ASMEB16.9, ASME 16.28, 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
4、for use inhigh-pressure 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
5、 cast-welding fittings 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
6、 used independently 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 Standa
7、rds:2A 370 Test Methods 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 Fittings
8、B16.28 Wrought Steel Buttwelding Short Radius Elbowsand Returns2.3 AWS Standard:AWS 5.18 Specification for Carbon Steel Metals for GasShielded Arc Welding42.4 ASME Boiler and Pressure Vessel Code:3Section V, Nondestructive ExaminationSection VIII, Division 1, Pressure VesselsSection IX , Welding and
9、 Brazing Qualifications2.5 MSS Standards:5MSS SP-25 The Standard Marking System of Valves,Fittings, Flanges and UnionsMSS-SP-75 Specification for High Test Wrought Butt-Welding Fittings2.6 American Society of Nondestructive Testing:6SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel
10、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 Requirements for certification of test report.4. General Requirements4.1 Product furnished to this specificatio
11、n shall conform tothe requirements of Specification A 960/A 960M, includingany supplementary requirements that are indicated in the1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is the direct responsibility of SubcommitteeA01.22 o
12、n Steel Forgings and Wrought Fittings for PipingApplications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved Dec. 10, 2000. Published February 2001. Originallyapproved in 1986. Last previous edition approved in 1996 as A 860/A 860M 96.2For referenced ASTM st
13、andards, 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 H
14、eadquarters, Three Park Ave., New York, NY 10016-5990.4Available from The American Welding Society (AWS), 550 NW LeJeune Rd.,Miami, FL 33126.5Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602.6Available from TheAmeri
15、can Society for Nondestructive Testing (ASNT), P.O.Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.purchase order. Failure to comply with the general require-ments of Specificati
16、on 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-grainmaterial m
17、ade by a melting process that is intended to producerounded, well dispersed, 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, forgin
18、gs,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 specifically requires the additionof any element beyond those listed in Table 1 is not permitted.This does not preclude the use
19、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 operations may be performed byhammering, pressing, piercing, extruding, upset
20、ting, 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 weldingprocedures qualified under the provisions of ASME Boiler andPressu
21、re 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 Pressure Vessel Code, Section V withacceptance limits in accordance with
22、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 VIII.5.8 All butt-weld tees manufactured by cold-forming meth-ods sha
23、ll be liquid penetrant or magnetic particle examined byone of the methods specified 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 wallare
24、a 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 accessibility. Nocracks shall be permitted. Other imperfections shall
25、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 personnel shall bequalified in accordance with SNT-TC-1A.5.9 All caps
26、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 with personnel qualifications, acceptancecriteria, and marking as in 5.8.6. Heat Treatment6.1 All fittings shall be furnished in
27、 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 treated by normalizing, quenching, andtempering or stress relieving
28、 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 The steel shall not contain any unspecified elements forthe ordered grade to the extent that it conforms to therequirements of ano
29、ther 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 for either heat or SpecificationA 960/A 960M for product analys
30、is 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 the basis for rejection. Forreferee purposes, Test Methods,
31、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 analysis:TABLE 1 Chemical RequirementsComposition %HeatAnalysisCarbon 0.20AManganese 1.001.45 All values arePhosphorus 0.030 maximum
32、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 calculated by the following formula, shall not exceed0.42 %:CE 5 C 1Mn61Cr 1 Mo 1 V51Ni
33、 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 00 (2005)2CE 5 C 1Mn61Cr 1 Mo 1 V51Ni 1 Cu157.6 Weld metal used in the construction of the fittings shallconf
34、orm 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 of flux. The weld metal shall be de
35、positedin 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 %.8. Notch Toughness Properties8.1 The notch toughness properties
36、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 specimens shall be usedwhenever possible. Small size specimens shall be used onlywhen the material thickness does not perm
37、it 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 the direction of primarymetal flow. Weld-metal specimens shall be specimens with theaxis transverse to the weld seam.8.2 O
38、ne 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 50F 46C.9. Tensile Requirements9.1 The tensile properties of the fitting material sha
39、ll 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 represent.9.3 One tensile test is required f
40、or each heat of fittings of thesame section thickness, and heat treated in either a continuousor batch-type furnace, controlled within a range of 50F 28Cand equipped with recording pyrometers.9.4 In addition, fittings containing welds shall have onecenter-weld tension test made with the axis transve
41、rse 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 50F28C and equipped with recording pyrometer
42、s. 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. Dimensions11.1 Dimensional requirements for NPS 14 and smallerbutt-welding fittings are provided inASME B16.9 and B16.28.TABLE 2
43、 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 63 435 66 455 75 515 77 530 80 55085 585 88 605 91 625 100 690 102 705 105 725Elongation:Standard r
44、ound 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 in. 50 mm.32 32 32 28 28 28Rectangular specimen for thickness less than516 in. 7.94mm; min, %
45、 2 in. 50 mm. Width of specimen 112 in. 40mm.BBBBBBToughness:Cvenergy absorptionC; measured at 50F 46C.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 m
46、ore 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 section thickness lies between two values defined above, the minimum elongation value is determi
47、ned 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 are not intended to give assurance against fracture propagation.A 860/A 860M 00 (2005)311.2 Dimen
48、sional 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 accordance with Supplemen-tary Requ
49、irement 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 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 strength of the pipe and the minimumtested yield strength of the fitting.12. Workmanship, Finish a
