1、Designation:A266/A266M13Standard Specification forCarbon Steel Forgings for Pressure Vessel Components1This standard is issued under the fixed designation A266/A266M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last re
2、vision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification2covers four grades of ca
3、rbon steelforgings for boilers,pressure vessels,and associated equip-ment.NOTE1Designations have been changed as follows:CurrentFormerlyGrade 1Class 1Grade 2Class 2Grade 3Class 3Grade 4Class 41.2 Supplementary requirements are provided for use whenadditional testing or inspection is desired.These sh
4、all applyonly when specified individually by the purchaser in the order.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Com
5、biningvalues from the two systems may result in non-conformancewith the standard.1.4 Unless the order specifies the applicable“M”specifica-tion designation,the material shall be furnished to the inch-pound units.2.Referenced Documents2.1 ASTM Standards:3A275/A275M Practice for Magnetic Particle Exam
6、ination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA788/A788M Specification for Steel Forgings,General Re-quirementsA1058 Test Methods for Mechanical Testing of SteelProductsMetricE112 Test Methods for Determining Average Grain SizeE165/E165M Practice fo
7、r Liquid Penetrant Examination forGeneral IndustryE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and Forgings2.2 Other Standard:ASME Boiler and Pressure Vessel Code,Section IX43.Ordering Information and General Requirements3.1 In addition to the ordering information required bySpecificat
8、ion A788/A788M,the purchaser shall include withthe inquiry and order a detailed drawing,sketch,or writtendescription of the forging.3.2 Material supplied to this specification shall conform tothe requirements of Specification A788/A788M,which out-linesadditionalorderinginformation,manufacturingrequi
9、rements,testing and retesting methods and procedures,marking,certification,product analysis variations,and addi-tional supplementary requirements.3.3 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M,therequirements of this specification shall
10、 prevail.3.4 For hubbed flat heads and tube sheets ordered forASMEBoiler and Pressure Vessel Code application,SupplementaryRequirement S12 of Specification A788/A788M shall bespecified in addition to Supplementary Requirement S8 of thisspecification.4.Materials and Manufacture4.1 The steel shall be
11、made in accordance with the MeltingProcess Section of Specification A788/A788M.A sufficientdiscard shall be made to secure freedom from injurious pipeand undue segregation.4.2 The material shall be forged as close as practical to thespecified shape and size.1This specification is under the jurisdict
12、ion of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved Nov.1,2013.Published January 2014.Originallyapproved in 1943.Last previous edition approved in 2011 as A266/A266M 11.DOI
13、:10.1520/A0266_A0266M-13.2For ASME Boiler and Pressure Vessel Code applications,see related Specifi-cation SA266/SA266M 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 vo
14、lume information,refer to the standards Document Summary page onthe ASTM website.4Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.*A Summary of Changes section appears at the end of this standardCopy
15、right ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.3 The finished product shall be a hot-worked forging asdefined by Specification A788/A788M.5.Machining5.1 Surfaces shall be machined as designated by the pur-chaser.Unmachined surfaces shall b
16、e sufficiently free of scaleto permit inspection.5.2 Machining may be performed either prior to or after heattreatment at the option of the manufacturer unless specified inaccordance with Supplementary Requirement S1.6.Heat Treatment6.1 After forging and before reheating for heat treatment,the forgings shall be cooled in such a manner as to preventinjury and to accomplish transformation.6.2 All forgings shall be annealed,normalized,or normal-ized and tempered,but alternatively may be liquid quen
