1、Designation: A 734/A734M 87a (Reapproved 2003)Standard Specification forPressure Vessel Plates, Alloy Steel and High-Strength Low-Alloy Steel, Quenched-and-Tempered1This standard is issued under the fixed designation A 734/A734M; 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 alloysteel
3、 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 st
4、eel 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 tomeet
5、 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
6、 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、A 20/A20M Specification for General Requirements forSteel Plates for Pressure Vessels2A 435/A435M Specification for Straight-Beam UltrasonicExamination of Steel Plates2A 577/A577M Specification for Ultrasonic Angle-BeamExamination of Steel Plates2A 578/A578M Specification for Straight-Beam Ultrasoni
8、cExamination of Plain and Clad Steel Plates for SpecialApplications23. Manufacture3.1 Steelmaking Practice:3.1.1 The steel shall be killed and shall conform to the fineaustenitic grain size requirement of Specification A 20/A 20M.4. Heat Treatment4.1 The plates shall be heat treated by quenching and
9、tempering. The 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 p
10、urchase 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 c
11、oupon.5. General 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, re
12、pair of defects, 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 thesp
13、ecification. 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
14、 responsibility of SubcommitteeA01.11 on Steel for Boilers and Pressure Vessels.Current edition approved Sept. 10, 2003. Published September 2003. Originallyapproved in 1976. Last previous edition approved in 1997 as A 734/A 734M 87a(1997).2Annual Book of ASTM Standards, Vol 01.04.1Copyright ASTM In
15、ternational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 testsp
16、ecimens shall conform to the requirements in Table 2.7.1.1 For nominal plate thicknesses of34 in. 20 mm andunder, 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
17、 greatest elongation.8. Retreatment8.1 Quenched-and-tempered material that fails to meet themechanical requirements may be re-heat treated. All requiredtests shall be repeated when material is resubmitted forinspection.SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless speci
18、fied in the purchase order. A list ofstandardized supplementary requirements for use at the option of the purchaser 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
19、 the supplier and thepurchaser.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat Treatment of MechanicalTest Coupons,S5. Charpy V-Notch Impact TestS6. Drop Weight Tests, andS8. Ultrasonic Examination in accordance with Specifica-tion A435/A 435M,S11. Ultrasonic Examination in ac
20、cordance with Specifica-tion A 577/A 577M,S12. Ultrasonic Examination 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
21、 0.19Manganese 0.450.75 0.400.83 1.60 max 1.72 maxPhosphorus, max 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
22、.06 . 0.06 .Vanadium, max . . 0.11 0.13Nitrogen, max . . 0.030 0.030Columbium . .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 Sp
23、ecification A 20/A 20M for elongation adjustment.A 734/A734M 87a (2003)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
24、 any such patent rights, and the riskof infringement of such rights, 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 ar
25、e invited either for revision of this standard or for additional 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 rec
26、eived a fair hearing you shouldmake your views known to the ASTM 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/A734M 87a (2003)3
