1、Designation: A860/A860M 18Standard 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. Dimensions of the fittings are provided inthe latest revisions of ASME B16.9 and MSS-SP-75. Butt-welding fittings differing from ASME B16.9 shall be furnishedin accordance with Supplementary Requirement S58 of Speci-fication A960/A960M. These fittings are for use in high-pres
4、sure gas and 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 fittin
5、gs orfittings 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 independen
6、tly of the other. 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.1.5 This international standard was developed in accor-dance
7、with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standa
8、rds:2A751 Test Methods, Practices, and Terminology 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 1S
9、ection IX2.4 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 NondestructiveTesting Personnel Qualification
10、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 furnished to this specification shall conform
11、tothe requirements of Specification A960/A960M, including any1This specification is under the jurisdiction 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 Bolting
12、Materials for Piping and Special Purpose Applications.Current edition approved May 1, 2018. Published May 2018. Originallyapproved in 1986. Last previous edition approved in 2014 as A860/A860M 14.DOI: 10.1520/A0860_A0860M-18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcon
13、tact 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 Headquarters, Two Park Ave., New York, NY 10016-5990,
14、 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, 1711 Arlingate Ln., Columbus, OH 43228-0518, ht
15、tp:/www.asnt.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on sta
16、ndardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1supplementary requirements that are indicated in the purchaseorder. Failure to comply w
17、ith the general requirements ofSpecification A960/A960M constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specification and Specification A960/A960M, thisspecification shall prevail.5. Materials and Manufacture5.1 The material for fittings shall b
18、e fully killed fine-grainmaterial made 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 sh
19、all 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 specifically requires the additionof any element beyond those listed in Table 1 is not permit
20、ted.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 operations may be performed byhammering, p
21、ressing, 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 weldingprocedures qualified under the
22、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 Pressure Vessel Code, Section V withac
23、ceptance 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 VIII.5.8 All butt-weld tees manufa
24、ctured 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 andshall be performed after final heat
25、 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 accessibility. Nocracks shall be perm
26、itted. 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 personnel shall bequalified in accord
27、ance 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 as in 5.8.6. Heat Treatment6.1 All
28、 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 treated by normalizing, quenching, a
29、ndtempering 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 grade to the extent that it confo
30、rms 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 for either heat or SpecificationA9
31、60/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. TheTABLE 1 Chemical RequirementsComposition %HeatAnalysisCarbon 0.20AManganese 1.001.45 All values arePhosphorus 0.030 maximum u
32、nlessSulfur 0.010 a range is statedSilicon 0.150.40BNickel 0.50CChromium 0.30CMolybdenum 0.25CCopper 0.35CTitanium 0.05Vanadium 0.10NiobiumD0.04Vanadium plusNiobium0.12Aluminum 0.06AThe carbon equivalent, as calculated by the following formula, shall not exceed0.42 %:CE 5 C1Mn61Cr1Mo1V51Ni1Cu15BIf v
33、acuum 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 %.DNiobium and columbium are interchangeable names for the same element andboth names are acceptable for use in A01.22 specifications.A8
34、60/A860M 182chemical composition thus determined shall conform to Table1. The product analysis shall be 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
35、 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 8.1after heat treatment in accordance with Section 6. A chemicalanalysis shall be performed on deposited weld metal
36、 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.7.7 Only the carbon content of the deposited weld-metalcomposition need comply with the requirements of Table 1.Th
37、e 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 shallbe performed as specified in Specification A960/A960M. Fullsize Charpy, V-notch spec
38、imens 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 flattened after heat treatment.Allbase metal specimens shall be removed with the axis of thespecimens longitudinal to the dir
39、ection 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 represent the base metal and one set (three specimens) torepresent the weld metal on the same frequency as the tensiontests.8.
40、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 andnominal
41、 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 F28 C and equipped with recordin
42、g 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 treate
43、d in either a continu-ous or batch-type furnace controlled within a range of 50 FTABLE 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 63 435 66 4
44、55 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.7.94 mm and over, and for all small sizes testedin full section; min, % in 2 in. 5
45、0 mm.32 32 32 28 28 28Rectangular specimen for thickness less than516 in.7.94 mm; min, % 2 in. 50 mm. Width of specimen112 in. 40 mm.BBBBBBToughness:Cvenergy absorptionC; measured at 50 F 46 C.Size, mm Average/min, ftlbsJLateral Expansion min, MLSmm10 10 30/25 40/34 25 0.6410 7.5 25/21 34/28 21 0.53
46、10 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 permitted. When the section th
47、ickness 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. The requirements are not inten
48、ded to give assurance against fracture propagation.A860/A860M 18328 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 Dimen
49、sional 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 60 are provided in MSS-SP-75.11.3 Fittings of a size or shape differing from the standard in11.1, 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
