1、Designation:A645/A645M10(Reapproved 2016)Standard Specification forPressure Vessel Plates,5%and 512%Nickel Alloy Steels,Specially Heat Treated1This standard is issued under the fixed designation A645/A645M;the number immediately following the designation indicates the yearof original adoption or,in
2、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.Scope1.1 This specification2covers specially heat treated 5%and512%nickel alloy steel plates inten
3、ded primarily for weldedpressure vessels for service at low or cryogenic temperatures.1.2 The maximum thickness of plates which can be suppliedunder this specification is limited only by the capacity of thematerial to meet the specified requirements.1.3 This material is susceptible to magnetization.
4、Use ofmagnets in handling after heat treatment should be avoided ifresidual magnetism would be detrimental to subsequent fabri-cation or service.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
5、 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.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with
6、 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.2.Referenced Documents2.1 ASTM Standards:3A20/A20M Specification for General Requirements for SteelPlates for Pr
7、essure 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 Requ
8、irements and Ordering Information3.1 Plates supplied to this material specification shall con-form to Specification A20/A20M.These requirements outlinethe testing and retesting methods and procedures,permittedvariations in dimensions and mass,quality and repair ofdefects,marking,loading,and ordering
9、 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 toth
10、e 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.Materials and Manufacture4.1 Steelmaking PracticeThe steel shall be killed andshall c
11、onform to the fine austenitic grain size requirements ofSpecification A20/A20M.5.Heat Treatment5.1 Grade A plates shall be heat treated in accordance with5.2.Grade B plates shall be heat treated in accordance with 5.3.Shell plates and other parts,including heads and reinforcingpads that are heated a
12、bove 1125F 605C for forming,shallbe heat treated after forming,5.2 Grade A,Procedure and Sequence:5.2.1 HardeningThe plates shall be heated to a tempera-ture within the range from 1575 to 1675F 855 to 915C,heldwithin that temperature range for a minimum of 1 h/in.2.4min/mm of thickness,but in no cas
13、e less than 15 min,and thenwater-quenched to below 300F 150C.5.2.2 Intermediate Heat TreatmentThe plates shall bereheated to a temperature within the range from 1275 to1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct re
14、sponsibility of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved March 1,2016.Published March 2016.Originallyapproved in 1971.Last previous edition approved in 2010 as A645/A645M 10.DOI:10.1520/A0645_A0645M-10R16.2For ASME Boiler and Pressure Vessel Code a
15、pplications see related Specifi-cation SA-645 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 w
16、ebsite.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 1400F 690 to 760C,held within that temperature range fora minimum of 1 h/in.2.4 min/mm of thickness,but in no caseless than 15 min,and then water-quenched to below 300F150C.5.2.3 TemperingThe plates shall be reheated to a tempera-ture within the range from 1150 to 1225F 620 to 665C,heldwithin that temperature range for a minimum of 1 h/in.2.4min/mm of thickness,but in no case less
