1、Designation: A 204/A 204M 03Standard Specification forPressure Vessel Plates, Alloy Steel, Molybdenum1This standard is issued under the fixed designation A 204/A 204M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of las
2、t 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification2covers molybdenum-a
3、lloy steelplates, 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 MPaA 6585 450585B 7090 485620C 7595 5156551.3 The maximum thickness of plates is
4、 limited only by thecapacity 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. mmA 6 150B 6 150C 4 1001.4 The values stated in eith
5、er inch-pound units or SI 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 n
6、onconformance with this specifi-cation.2. Referenced Documents2.1 ASTM Standards:A 20/A 20M Specification for General Requirements forSteel Plates for Pressure Vessels3A 435/A 435M Specification for Straight-Beam UltrasonicExamination of Steel Plates3A 577/A 577M Specification for Ultrasonic Angle-B
7、eamExamination of Steel Plates3A 578/A 578M Specification for Straight-Beam UltrasonicExamination of Plain and Clad Steel Plates for SpecialApplications33. General Requirements and Ordering Information3.1 Plates supplied to this product specification shall con-form to Specification A 20/A 20M, which
8、 outlines the testingand retesting methods and procedures, permissible variationsin dimensions and mass, quality and repair of defects, marking,loading, etc.3.2 Specification A 20/A 20M also establishes the rules forordering information that should be complied with whenpurchasing plates to this spec
9、ification.3.3 In addition to the basic requirements of this specifica-tion, certain supplementary requirements are available whereadditional control, testing, or examination is required to meetend use requirements.3.4 The purchaser is referred to the listed supplementaryrequirements in this specific
10、ation and to the detailed require-ments in Specification A 20/A 20M.3.5 Coils are excluded from qualification to this specifica-tion until they are processed into finished plates. Platesproduced from coil means plates that have been cut toindividual lengths from coil. The processor directly controls
11、, oris responsible for, the operations involved in the processing ofcoils into finished plates. Such operations include decoiling,leveling, cutting to length, testing, inspection, conditioning,heat treatment (if applicable), packaging, marking, loading forshipment, and certification.NOTE 1For plates
12、 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 described in Specification A 20/A 20M.3.6 If the requirements of this specification are in conflictwit
13、h the requirements of Specification A 20/A 20M, the re-quirements of this specification shall prevail.1This specification is under 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 an
14、d Pressure Vessels.Current edition approved Sept. 10, 2003. Published October 2003. Originallyapproved in 1937. Last previous edition approved in 1999 as A204/A 204M 93(1999).2For ASME Boiler and Pressure Vessel Code applications, see related Specifi-cation SA-204/SA 204M in Section II of that Code.
15、3Annual Book of ASTM Standards, Vol. 01.04.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Materials and Manufacture4.1 Steelmaking PracticeThe steel shall be kille
16、d.5. Heat Treatment5.1 Plates 112 in. 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 112 in. 40 mm in thickness shall benormalized.6. Chemical Requirements6.1 The steel shall conform to the
17、chemical requirementsgiven in Table 1 unless otherwise modified in accordance withSupplementary Requirement S17, Vacuum Carbon-DeoxidizedSteel, in Specification A 20/A 20M.7. Mechanical Requirements7.1 Tension Test RequirementsThe plates, as representedby the tension-test specimens, shall conform to
18、 the require-ments given in Table 2.TABLE 1 Chemical RequirementsElement Composition, %Grade A Grade B Grade CCarbon, maxA:Up to 1 in. 25 mm incl, inthickness0.18 0.20 0.23Over 1 in. to 2 in. 50 mmincl, in thickness0.21 0.23 0.26Over 2 in. to 4 in. 100 mmincl, in thickness0.23 0.25 0.28Over 4 in. 10
19、0 mm in thick-ness0.25 0.27 0.28Manganese, max:Heat analysis 0.90 0.90 0.90Product analysis 0.98 0.98 0.98Phosphorous, maxA0.035 0.035 0.035Sulfur, maxA0.035 0.035 0.035Silicon:Heat analysis 0.150.40 0.150.40 0.150.40Product analysis 0.130.45 0.130.45 0.130.45Molybdenum:Heat analysis 0.450.60 0.450.
20、60 0.450.60Product analysis 0.410.64 0.410.64 0.410.64AApplies to both heat and product analyses.TABLE 2 Tensile RequirementsGrade A Grade B Grade Cksi MPa ksi MPa ksi MPaTensile strength 6585 450585 7090 485620 7595 515655Yield strength, minA37 255 40 275 43 295Elongation in 8 in. 200 mm, min, %B19
21、 17 16Elongation in 2 in. 50 mm, min, %B23 21 20ADetermined by either the 0.2 % offset method or the 0.5 % extension-under-load method.BSee Specification A 20/A 20M for elongation adjustment.SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order.A
22、 list of standardized supplementary requirements for use at the option of the purchaser is includedin Specification A 20/A 20M. Those that are considered suitable for use with this specification arelisted in this section by title.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat
23、 Treatment of MechanicalTest Coupons,S4.1 Additional Tension Test,S5. Charpy V-Notch Impact Test,S6. Drop Weight Test,S7. High-Temperature Tension Test,S8. Ultrasonic Examination in accordance with Specifica-tion A 435/A 435M,S9. Magnetic Particle Examination,S11. Ultrasonic Examination in accordanc
24、e with Specifica-tion A 577/A 577M,S12. Ultrasonic Examination in accordance with Specifica-tion A 578/A 578M, andS17. Vacuum Carbon-Deoxidized Steel.A 204/A 204M 032SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue (A 204/A204M 93
25、(1999) that may impact the use of this standard.(1) Added 3.5 and Note 1 to be consistent with the terminologyand requirements of Specification A 20/A 20M.(2) 3.3 was revised to be more general.ASTM International takes no position respecting the validity of any patent rights asserted in connection w
26、ith 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 rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible tec
27、hnical 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 additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful considera
28、tion 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 International, 100 Barr H
29、arbor 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 204/A 204M 033
