ASTM_A_508_-_A_508M_-_17.pdf

Designation:A508/A508M17Standard Specification forQuenched and Tempered Vacuum-Treated Carbon and AlloySteel Forgings for Pressure Vessels1This standard is issued under the fixed designation A508/A508M;the number immediately following the designation indicates the yearof original adoption or,in the case 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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification2covers quenched and temperedvacuum-treated carbon and alloy steel forgings for pressurevessels such as those used in reactor systems.Specifically,itcovers forgings for vessel closures,shells,flanges,tube sheets,rings,heads,and similar parts.1.2 All grades are considered weldable under proper condi-tions.Welding technique is of fundamental importance,and itis presupposed that welding procedure and inspection will be inaccordance with approved methods for the grade of materialused.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.Combiningvalues 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.NOTE1Grades 1 and 1A are composed of different chemistries buthave the same mechanical requirements.NOTE2Designations have been changed as follows:CurrentFormerlyGrade 1Class 1Grade 1AClass 1AGrade 2 Class 1Class 2Grade 2 Class 2Class 2AGrade 3 Class 1Class 3Grade 3 Class 2Class 3AGrade 4N Class 1Class 4Grade 4N Class 2Class 4AGrade 4N Class 3Class 4BGrade 5 Class 1Class 5Grade 5 Class 2Class 5AGrade 22 Class 3Class 22BGrade 22 Classes 4,5,6,and 7Grade 3VClass 3V1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance 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 Standards:3A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsA966/A966M Practice for Magnetic Particle Examination ofSteel Forgings Using Alternating CurrentE208 Test Method for Conducting Drop-Weight Test toDetermine Nil-Ductility Transition Temperature of Fer-ritic SteelsE428 Practice for Fabrication and Control of Metal,Otherthan Aluminum,Reference Blocks Used in UltrasonicTesting1This specification is under the jurisdiction 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 May 1,2017.Published May 2017.Originallyapproved in 1964.Last previous edition approved in 2016 as A508/A508M-16.DOI:10.1520/A0508_A0508M-17.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-508/SA-508M 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 standards Document Summary page onthe ASTM website.*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 standardization 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.1 2.2 American Society of Mechanical Engineers Standard:Boiler and Pressure Vessel CodeSection III,ArticlesNB 2300,NC 2300,ND 2300,NE 2300,NF 2300,NG230043.Terminology3.1 Definitions:3.1.1 controlling cross section thickness(TC)the diameterof the largest theoretical sphere which can be inscribed withinthe volume of the forging.4.Ordering Information4.1 Purchase OrderIn addition to the ordering informa-tion required by Specification A788/A788M,the purchasershall include with the inquiry and order a detailed drawing thatlocates the areas of sign