ASTM_A_734_-_A_734M_-_12.pdf

Designation:A734/A734M12Standard Specification forPressure Vessel Plates,Alloy Steel and High-Strength Low-Alloy Steel,Quenched-and-Tempered1This standard is issued under the fixed designation A734/A734M;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 This specification covers quenched-and-tempered alloysteel and high-strength low-alloy steel plates for piping com-ponents and welded pressure vessels.1.2 Two types are covered,which provide two differentchemical compositions with the same tensile requirements.Both types are quenched-and-tempered to enhance mechanicalproperties.1.2.1 Type A is an alloy steel intended for use at low ambienttemperatures of 80F 60C and higher.1.2.2 Type B is a high-strength low-alloy steel intended foruse at ambient temperatures of 20F 30C and higher.1.3 The maximum thickness of plates is limited only by thecapacity of the chemical composition and heat treatment tomeet the specified mechanical property requirements.Indi-vidual manufacturers should be consulted on thickness limita-tions since current industry limitations have not been ascer-tained to date.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem are not exact equivalents;therefore,each system mustbe used independently of the other.Combining values from thetwo systems may result in nonconformance with the specifi-cation.2.Referenced Documents2.1 ASTM Standards:2A20/A20M Specification for General Requirements for SteelPlates for Pressure VesselsA435/A435M Specification for Straight-Beam UltrasonicExamination of Steel PlatesA577/A577M Specification for Ultrasonic Angle-Beam Ex-amination of Steel PlatesA578/A578M Specification for Straight-Beam UltrasonicExamination of Rolled Steel Plates for Special Applica-tions3.General Requirements and Ordering Information3.1 Material supplied to this material specification shallconform to the requirements of Specification A20/A20M.These requirements outline the testing and retesting methodsand procedures,permissible variations in dimensions and mass,quality,repair of defects,marking,loading,and orderinginformation.3.2 In addition to the basic requirements of this specifica-tion,certain supplementary requirements are available whenadditional control,testing,or examination is required to meetend use requirements.The purchaser is referred to the listedsupplementary requirements in this specification and to thedetailed 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 The plates shall be heat treated by quenching andtempering.The austenitizing temperature shall be 1725F940C maximum.Tempering temperature shall be 1150 to1300F 620 to 705C.5.2 If the purchaser elects to perform the heat treatment,thematerial shall be accepted on the basis of mill tests made fromtest coupons heat treated in accordance with the purchase orderrequirements.If the test coupon heat treatment is not indicatedon the purchase order,the manufacturer shall heat treat the testcoupons under conditions he considers appropriate.The manu-facturer shall inform the purchaser of the heat-treat procedurefollowed in treatment of the test coupon.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 May 1,2012.Published June 2012.Originallyapproved in 1976.Last previous edition approved in 2007 as A734/A734M 87a(2007).DOI:10.1520/A0734_A0734M-12.2For 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);6.Chemical Requirements6.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 1.7.Mechanical Requirements7.1 Tension TestThe material as represented by the testspecimens shall conform to the requirements in Table 2.7.1.1 For nominal plate thicknesses of34in.20 mm andunder,the 112-in.40-mm wide rectangular specimen may beused f