ASTM A420 A420M-2014 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service《低温用锻制碳素钢和合金钢管配件的标准规格》.pdf
《ASTM A420 A420M-2014 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service《低温用锻制碳素钢和合金钢管配件的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM A420 A420M-2014 Standard Specification for Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service《低温用锻制碳素钢和合金钢管配件的标准规格》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: A420/A420M 14Standard 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 ca
2、se 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 we
3、lded construction, cov-ered by the latest revision of ASME B16.9, ASME B16.11,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 Specification A960/A960M. These fittings are for use
4、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 is
5、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. W
6、ithin 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 addition
7、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 Fittings4
8、B 16.11 Forged Steel Fittings, Socket-Welding Threaded4Section VIII Division 1, Pressure Vessels4Section IX2.4 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, Socket-Welding andThreaded5MSS
9、 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 Information3.1 See Specific
10、ation 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 ofSpecification A960/A960
11、M constitutes non-conformance with1This 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 Forgings and Wrought Fittings for Piping Applications and BoltingMaterials for Piping and
12、Special Purpose Applications.Current edition approved Oct. 1, 2014. Published October 2014. Originallyapproved in 1958. Last previous edition approved in 2013 as A420/A420M13.DOI: 10.1520/A0420_A0420M-14.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-420 in Sect
13、ion 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 standards Document Summary page onthe ASTM website.4Available from American Society of Mecha
14、nical Engineers (ASME), ASMEInternational Headquarters, Two Park Ave., New York, NY 10016-5990, http:/www.asme.org.5Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.6Available fromAmerican Society fo
15、r Nondestructive Testing (ASNT), P.O. Box28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/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 States1this spec
16、ification. In case of conflict between the requirementsof this specification and Specification A960/A960M, thisspecification shall prevail.5. Material5.1 The starting material for fittings shall be fully killedsteel, consisting of forgings, bars, plates, sheet, and seamless orfusion welded tubular p
17、roducts with filler metal added andshall conform to the chemical requirements in Table 1. Thesteels shall be made using recognized melting practices neces-sary to produce steels that shall meet the impact requirementsof this specification.6. Manufacture6.1 Forging or forming operations shall be perf
18、ormed 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 produce injurious defects in thefittings.6.2 All welds, including welds in tubu
19、lar 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 specification, and (3) nondestructively exam-ined throughout the entire length of e
20、ach weld in accordancewith Section 15 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 accordance with SNT-TC-1A.6.3 The welded joints of the fittings shall be finished i
21、naccordance 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 particle examined byone of the methods specified in Supplementary RequirementS
22、52 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 area is defined bya circle that covers the area from the weld bevel of the bran
23、choutlet 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 tees shall be marked withthe symbol PT or MT, as applicable, to indicate com
24、pliance.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 welded, is a full penetrationjoint, satisfies the requirements of 6.2 for qu
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