1、Designation: A734/A734M 12Standard 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,
2、 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 lo
3、w-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
4、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 mechan
5、ical 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 unit
6、s 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 Specificati
7、on 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 St
8、eel 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 di
9、mensions and mass,quality, repair of defects, marking, loading, and orderinginformation.3.2 In addition to the basic requirements of thisspecification, certain supplementary requirements are availablewhen additional control, testing, or examination is required tomeet end use requirements. The purcha
10、ser is referred to thelisted supplementary requirements in this specification and tothe 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.
11、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
12、 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 indicatedo
13、n 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 S
14、teel,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:
15、 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 appear
16、s at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesNOTICE: This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International (www.astm.org) for the latest informati
17、on16. 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 of34
18、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 greatest elongation.8. Retreatment8.1 Quenched-and-tempered material that fails to meet theme
19、chanical requirements may be re-heat treated. All requiredtests shall be repeated when material is resubmitted forinspection.9. Keywords9.1 alloy steel plates; pressure containing parts; pressurevessel steels; steel plates; quenched and tempered; high-strength low-alloy steelSUPPLEMENTARY REQUIREMEN
20、TSSupplementary requirements shall not apply unless specified in the purchase order. A list ofstandardized supplementary requirements for use at the option of the purchaser is included inSpecification A20/A20M. Several of those considered suitable for use with this specification are listedbelow by t
21、itle. Other tests may be performed by agreement between the supplier and the purchaser.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat Treatment of MechanicalTest Coupons,S5. Charpy V-Notch Impact Test,S6. Drop Weight Tests (for Material 0.625 in. 16 mm andover in Thickness),S
22、8. Ultrasonic Examination in accordance with Specifica-tion A435/A435M,S11. Ultrasonic Examination in accordance with Specifica-tion A577/A577M,S12. Ultrasonic Examination in accordance with Specifica-tion A578/A578M,S24. Strain Age Test, andS25. Weldability.TABLE 1 Chemical RequirementsElementType
23、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, max 0.025 0.025 0.025 0.025Sulfur, max 0.015 0.015 0.015 0.015Silicon, max 0.40 0.45 0.40 0.45Copper, maxA. . 0.35 0.38Nickel 0.901.20 0.8
24、51.25 . .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 0.030Columbium . .B.AWhen specified.BColumbium may be present in the amount of 0.050 % maximum.TABLE 2 Tensile RequirementsYield strength
25、 min, ksi MPa 65 450Tensile strength, ksi MPa 7797 530670Elongation in 2 in. 50 mm, min, %A20ASee Specification A20/A20M for elongation adjustment.A734/A734M 122SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A734/A734M 87a (2007)
26、 that may impact the use of this standard. (Approved May 1, 2012.)(1) Table 1 was revised.(2) Section 5 was editorially revised and renumbered to Sec-tion 3; Sections 4 and 5 were also renumbered.(3) Section 9 was added.ASTM International takes no position respecting the validity of any patent right
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29、 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 ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM
30、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A734/A734M 123
