1、Designation: A 734/A 734M 87a (Reapproved 2007)Standard Specification forPressure Vessel Plates, Alloy Steel and High-Strength Low-Alloy Steel, Quenched-and-Tempered1This standard is issued under the fixed designationA 734/A 734M; the number immediately following the designation indicates the yearof
2、 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers quenched-and-tempered alloystee
3、l 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 s
4、teel intended for use at lowambient temperatures 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 tomee
5、t 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. Withi
6、n 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
7、:2A 20/A 20M Specification for General Requirements forSteel Plates for Pressure VesselsA 435/A 435M Specification for Straight-Beam UltrasonicExamination of Steel PlatesA 577/A 577M Specification for Ultrasonic Angle-BeamExamination of Steel PlatesA 578/A 578M Specification for Straight-Beam Ultras
8、onicExamination of Rolled Steel Plates for Special Applica-tions3. Manufacture3.1 Steelmaking PracticeThe steel shall be killed andshall conform to the fine austenitic grain size requirement ofSpecification A 20/A 20M.4. Heat Treatment4.1 The plates shall be heat treated by quenching andtempering. T
9、he austenitizing temperature shall be 1725F940C maximum. Tempering temperature shall be 1150 to1300F 620 to 705C.4.2 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 orde
10、rrequirements. 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.5. Gen
11、eral Requirements and Basis of Purchase5.1 Material supplied to this material specification shallconform to the requirements of Specification A 20/A 20M.These requirements outline the testing and retesting methodsand procedures, permissible variations in dimensions andweight, quality, repair of defe
12、cts, marking, loading, etc.5.2 Specification A 20/A 20M also establishes the rules forcompliance to the basis of purchase when purchasing materialto this specification.5.3 Certain supplementary requirements considered suitablefor use with this specification are listed at the end of thespecification.
13、 These include some of the standardized supple-mentary requirements listed in Specification A 20/A 20M aswell as additional ones unique to this specification.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibili
14、ty of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved Nov. 1, 2007. Published March 2008. Originallyapproved in 1976. Last previous edition approved in 2003 as A 734/A 734M 87a (2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, o
15、rcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Chemical Requi
16、rements6.1 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 of34 in. 20 mm andunder,
17、the 112-in. 40-mm wide rectangular specimen may beused for the tension test, and the elongation may be determinedin a 2-in. 50-mm gage length that includes the fracture andthat shows the greatest elongation.8. Retreatment8.1 Quenched-and-tempered material that fails to meet themechanical requirement
18、s may be re-heat treated. All requiredtests shall be repeated when material is resubmitted forinspection.SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order. A list ofstandardized supplementary requirements for use at the option of the purchase
19、r is included inSpecification A 20/A 20M. Several of those considered suitable for use with this specification arelisted below by title. Other tests may be performed by agreement between the supplier and thepurchaser.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat Treatment of
20、 MechanicalTest Coupons,S5. Charpy V-Notch Impact Test,S6. Drop Weight Tests (for Material 0.625 in. 16 mm andover in Thickness),S8. Ultrasonic Examination in accordance with Specifica-tion A 435/A 435M,S11. Ultrasonic Examination in accordance with Specifica-tion A 577/A 577M,S12. Ultrasonic Examin
21、ation in accordance with Specifica-tion A 578/A 578M,S24. Strain Age Test, andS25. Weldability.TABLE 1 Chemical RequirementsElementType A Type BHeatAnalysis, %ProductAnalysis, %HeatAnalysis, %ProductAnalysis, %Carbon, max 0.12 0.14 0.17 0.19Manganese 0.450.75 0.400.83 1.60 max 1.72 maxPhosphorus, ma
22、x 0.035 0.036 0.035 0.036Sulfur, max 0.015 0.016 0.015 0.016Silicon, max 0.40 0.45 0.40 0.45Copper, maxA. . 0.35 0.38Nickel 0.901.20 0.851.25 . .Chromium 0.901.20 0.841.26 0.25 max 0.29 maxMolybdenum 0.250.40 0.220.43 . .Aluminum, max 0.06 . 0.06 .Vanadium, max . . 0.11 0.13Nitrogen, max . . 0.030 0
23、.030Columbium . .B.AWhen specified.BColumbium may be present in the amount of 0.050 % maximum.TABLE 2 Tensile RequirementsYield strength min, ksi MPa 65 450Tensile strength, ksi MPa 7797 530670Elongation in 2 in. 50 mm, min, %A20ASee Specification A 20/A 20M for elongation adjustment.A 734/A 734M 87
24、a (2007)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such ri
25、ghts, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additiona
26、l standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the AST
27、M Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).A 734/A 734M 87a (2007)3
