ASTM A420 A420M-2010a Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service《低温设施用锻造碳钢和合金钢的管道配件用标准规格》.pdf
《ASTM A420 A420M-2010a Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service《低温设施用锻造碳钢和合金钢的管道配件用标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM A420 A420M-2010a Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service《低温设施用锻造碳钢和合金钢的管道配件用标准规格》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A420/A420M 10aStandard Specification forPiping Fittings of Wrought Carbon Steel and Alloy Steel forLow-Temperature Service1This standard is issued under the fixed designation A420/A420M; the number immediately following the designation indicates the yearof original adoption or, in the c
2、ase of revision, the year 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 specification2covers wrought carbon steel andalloy steel fittings of seamless and w
3、elded construction, cov-ered by the latest revision of ASME B 16.9, ASME B 16.11,MSS SP-79, MSS SP-83, MSS SP-95, and MSS SP-97.Fittings differing from these ASME and MSS standards shallbe furnished in accordance with Supplementary RequirementS58 of SpecificationA960/A960M. These fittings are for us
4、e inpressure piping and pressure vessel service at low tempera-tures.1.2 Optional supplementary requirements are provided forfittings where a greater degree of examination is desired. Whendesired, one or more of these supplementary requirements shallbe specified in the order.1.3 This specification i
5、s expressed in both inch-pound unitsand in SI units. However, unless the order specifies theapplicable “M” specification designation (SI units), the mate-rial shall be furnished to inch-pound units.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.
6、 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. Combining valuesfrom the two systems may result in non-conformance with thestandard.2. Referenced Documents2.1 In additio
7、n to those Referenced Documents listed inSpecification A960/A960M, the following list of standardsapply to this specification.2.2 ASTM Standards:3A960/A960M Specification for Common Requirements forWrought Steel Piping Fittings2.3 ASME Standards:B 16.9 Factory-Made Wrought Steel Butt-Welding Fitting
8、s4B 16.11 Forged Steel Fittings, Socket-Welding Threaded4Section VIII Division 1, Pressure Vessels4Section IX Welding Qualifications2.4 MSS Standards:MSS SP-25 Standard Marking System for Valves, Fittings,Flanges, and Unions5MSS SP-79 Socket Welding Reducer Inserts5MSS SP-83 Steel Pipe Unions, Socke
9、t-Welding andThreaded5MSS SP-95 Swage(d) Nipples and Bull Plugs5MSS SP-97 Integrally Reinforced Forged Branch OutletFittingsSocket Welding, Threaded and ButtweldingEnds2.5 ASNT Standards:SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel Qualification and Certification63. Ordering In
10、formation3.1 See Specification A960/A960M.4. General Requirements4.1 Product furnished 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
11、ofSpecification A960/A960M constitutes non-conformance withthis specification. In case of conflict between the requirements1This 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 Steel F
12、orgings and Wrought Fittings for Piping Applications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved Nov. 1, 2010. Published December 2010. Originallyapproved in 1958. Last previous edition approved in 2010 as A420/A420M10.DOI: 10.1520/A0420_A0420M-10a.2For
13、ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-420 in Section II of that Code.3For 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 s
14、tandards Document Summary page onthe ASTM website.4Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave., New York, NY 10016-5990, http:/www.asme.org.5Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS
15、), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.6Available 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
16、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.of this specification and Specification A960/A960M, thisspecification shall prevail.5. Material5.1 The material for fittings shall consist of forgings, bars,plates, seamless or fusion welded tubular products with f
17、illermetal added. It shall conform to the chemical requirements inTable 1, and be made by one of the following processes:open-hearth, basic-oxygen, or electric-furnace. The steels shallbe made using recognized melting practices necessary toproduce steels that shall meet the impact requirements of th
18、isspecification.6. Manufacture6.1 Forging or forming operations shall be performed byhammering, pressing, piercing, extruding, upsetting, working,bending, fusion-welding, or machining, or by a combination oftwo or more of these operations. The forming procedure shallbe so applied that it will not pr
19、oduce injurious defects in thefittings.6.2 All welds, including welds in tubular products fromwhich fittings are made, shall be (1) made by welders, weldingoperators and welding procedures qualified under the provi-sions of ASME Section IX,(2) heat treated in accordance withSection 7 of this specifi
20、cation, and (3) nondestructively exam-ined throughout the entire length of each weld in accordancewith Section 14 of this specification. The radiography of weldsshall be done either prior to or after forming at option ofmanufacturer. Personnel performing NDE examinations shallbe qualified in accorda
21、nce with SNT-TC-1A.6.3 The welded joints of the fittings shall be finished inaccordance with the requirements of Paragraph UW-35 (a) ofSection VIII, Division 1 of ASME Boiler and Pressure VesselCode.6.4 All butt-weld tees manufactured by cold-forming meth-ods shall be liquid penetrant or magnetic pa
22、rticle examined byone of the methods specified in Supplementary RequirementS52 or S53 of Specification A960/A960M. This examinationshall be performed after final heat treatment by NDE personnelqualified under the provisions of SNT-TC-1A. Only the side-wall areas of the tee need be examined. This are
23、a is defined bya circle that covers the area from the weld bevel of the branchoutlet to the centerline of the body or run. Internal and externalsurfaces shall be examined when size permits accessibility.After the removal of any cracks, the tees shall be re-examinedby the original method. Acceptable
24、tees shall be marked withthe symbol PT or MT, as applicable, to indicate compliance.6.5 Stubends may be produced with the entire lap added bythe welding of a ring, made from plate or bar of the same alloygrade and composition, to the outside of a straight section ofpipe, provided the weld is double
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