ASTM_A_738_-_A_738M_-_12a.pdf

Designation:A738/A738M12aStandard Specification forPressure Vessel Plates,Heat-Treated,Carbon-Manganese-Silicon Steel,for Moderate and Lower Temperature Service1This standard is issued under the fixed designation A738/A738M;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.1.Scope*1.1 Thisspecification2coversheat-treatedcarbon-manganese-silicon steel plates intended for use in weldedpressure vessels at moderate and lower temperature service.1.2 Material under this specification is available in fourstrength levels,75 ksi 515 MPa,85 ksi 585 MPa,80 ksi550 MPa,and 90 ksi 620 MPa minimum ultimate tensilestrengths.1.3 The maximum thickness of plates for Grades A,B,andC is limited only by the capacity of the chemical compositionand heat treatment to meet the specified mechanical propertyrequirements;however,current practice normally limits themaximum thickness of plates furnished under this specificationto 6 in.150 mm for Grade A,4 in.100 mm for Grade B,and 6 in.150 mm for Grade C.The maximum permittednominal thickness is 1.5 in.40 mm for Grade D and 2 in.50mm for Grade E.1.4 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.2.Referenced Documents2.1 ASTM Standards:3A20/A20M Specification for General Requirements for SteelPlates for Pressure Vessels3.General Requirements and Ordering Information3.1 Material supplied to this material specification shallconform to Specification A20/A20M.These requirements out-line the testing and retesting methods and procedures,permit-ted variations in dimensions,and mass,quality and repair ofdefects,marking,loading,and ordering information.3.2 Inadditiontothebasicrequirementsofthisspecification,certain supplementary requirements are availablewhen additional control,testing,or examination is required tomeet end use requirements.The purchaser is referred to thelisted supplementary requirements in this specification and tothe detailed requirements in Specification A20/A20M.3.3 If the requirements of this specification are in conflictwith the requirements of Specification A20/A20M,the require-ments of this specification shall prevail.4.Manufacture4.1 Steelmaking PracticeThe steel shall be killed andshall conform to the fine austenitic grain size requirement ofSpecification A20/A20M.5.Heat Treatment5.1 Grade A plates 2.5 in.65 mm and under in thicknessshall be supplied in the normalized condition or in thequenched and tempered condition at the option of the manu-facturer.5.2 Grade A plates over 2.5 in.65 mm in thickness andGrade B,Grade C,Grade D,and Grade E plates in allthicknesses shall be quenched-and-tempered.5.3 When plates are tempered,the minimum temperingtemperature shall be 1100F 595C.6.Chemical Requirements6.1 The steel shall conform to the chemical requirementsshown in Table 1 unless otherwise modified in accordance withSupplementaryRequirementS 17,VacuumCarbon-Deoxidized Steel in Specification A20/A20M.7.Mechanical Requirements7.1 Tension Test RequirementsThe plates as representedby the tension test specimens shall conform to the requirementsof Table 2.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved Nov.1,2012.Published January 2013.Originallyapproved in 1976.Last previous edition approved in 2012 as A738/A738M 12.DOI:10.1520/A0738_A0738M-12A.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-738/SA-738M 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 States1Copyright by ASTM Intl(all rights reserved);TABLE 1 Chemical RequirementsElementComposition,%Grade AGrade BGrade CGrade DGrade ECarbon,maxA0.240.200.200.100.12BManganese:Heat analysis1.5 in.40 mm and under1.50 max0.901.501.50 max1.001.601.101.60BOver 1.5 to 2.0 in.40 to 50 mm1.50 max0.901.501.50 maxC1.101.60BOver 2.0 to 2.5 in.50 to 65 mm,incl1.50 max0.901.501.50 maxCCOver 2.5 in.65 mm1.60 max0.901.601.60 maxCCProduct analysis1.5 in.40 mm and under1.62 max0.841.621.62 max0.921.721.021.72BOver 1.5 to 2.0 in.40 to 50 mm,incl1.62 max0.841