1、Designation:A204/A204M12Standard Specification forPressure Vessel Plates,Alloy Steel,Molybdenum1This standard is issued under the fixed designation A204/A204M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.
2、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 Department of Defense.1.Scope*1.1 This specification2covers molybdenum-alloy steelplates
3、,intended particularly for welded boilers and otherpressure vessels.1.2 Plates under this specification are available in threegrades having different strength levels as follows:GradeTensile Strength,ksi MPaA6585 450585B7090 485620C7595 5156551.3 The maximum thickness of plates is limited only by the
4、capacity of the composition to meet the specified mechanicalproperty requirements;however,current practice normallylimits the maximum thickness of plates furnished under thisspecification as follows:GradeMaximum Thickness,in.mmA6 150B6 150C4 1001.4 The values stated in either inch-pound units or SI
5、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 this specifi-
6、cation.2.Referenced Documents2.1 ASTM Standards:3A20/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/A57
7、8M 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 Specification A20/A20M.These requirements out-line the testing and retesting me
8、thods and procedures,permit-ted variations in dimensions,and mass,quality and repair ofdefects,marking,loading,and ordering information.3.2 In addition to the basic requirements of this specifica-tion,certain supplementary requirements are available whenadditional control,testing,or examination is r
9、equired 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 Coils are excluded from qualification to this specifica-tion until they are processed into finished plates.Platesp
10、roduced from coil means plates that have been cut toindividual lengths from coil.The processor directly controls,oris responsible for,the operations involved in the processing ofcoils into finished plates.Such operations include decoiling,leveling,cutting to length,testing,inspection,conditioning,he
11、at treatment(if applicable),packaging,marking,loading forshipment,and certification.NOTE1For plates produced from coil and furnished without heattreatment or with stress relieving only,three test results are reported foreach qualifying coil.Additional requirements regarding plates from coilare descr
12、ibed in Specification A20/A20M.3.4 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.1This specification is under
13、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 1937.Last previous edition approved
14、 in 2007 as A204/A204M 03(2007).DOI:10.1520/A0204_A0204M-12.2For ASME Boiler and Pressure Vessel Code applications,see related Specifi-cation SA-204/SA 204M in Section II of that Code.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.or
15、g.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 States1Copyrigh
16、t by ASTM Intl(all rights reserved);5.Heat Treatment5.1 Plates 112in.40 mm and under in thickness arenormally supplied in the as-rolled condition.The plates may beordered normalized or stress relieved or both.5.2 Plates over 112in.40 mm in thickness shall benormalized.6.Chemical Requirements6.1 The steel shall conform to the chemical requirementsgiven in Table 1 unless otherwise modified in accordance withSupplementary Requirement S17,Vacuum Carbon-DeoxidizedSteel,in Specification A20/A20M.7.Mec
