1、Designation: A204/A204M 12A204/A204M 17Standard 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 ye
2、ar 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification2 cover
3、s molybdenum-alloy steel plates, intended particularly for welded boilers and other pressurevessels.1.2 Plates under this specification are available in three grades having different strength levels as follows:Grade Tensile Strength, ksi MPaA 6585 450585B 7090 485620C 7595 5156551.3 The maximum thic
4、kness of plates is limited only by the capacity of the composition to meet the specified mechanicalproperty requirements; however, current practice normally limits the maximum thickness of plates furnished under thisspecification as follows: requirements.Grade Maximum Thickness, in. mmA 6 150B 6 150
5、C 4 1001.4 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be usedindependently of the other. Combining valu
6、es from the two systems may result in nonconformance with this specification.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and R
7、ecommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3A20/A20M Specification for General Requirements for Steel Plates for Pressure VesselsA435/A435M Specification for Straight-Beam Ultrasonic Examination of Steel
8、PlatesA577/A577M Specification for Ultrasonic Angle-Beam Examination of Steel PlatesA578/A578M Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications3. General Requirements and Ordering Information3.1 Material supplied to this material specification sh
9、all conform to Specification A20/A20M. These requirements outline thetesting and retesting methods and procedures, permitted variations in dimensions, and mass, quality and repair of defects, marking,loading, and ordering information.3.2 In addition to the basic requirements of this specification, c
10、ertain supplementary requirements are available when additionalcontrol, testing, or examination is required to meet end use requirements. The purchaser is referred to the listed supplementaryrequirements in this specification and to the detailed requirements in Specification A20/A20M.1 This specific
11、ation is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.11on Steel Plates for Boilers and Pressure Vessels.Current edition approved May 1, 2012Nov. 1, 2017. Published June 2012November 2017. Originally appr
12、oved in 1937. Last previous edition approved in 20072012 asA204/A204M 03 (2007).A204/A204M 12. DOI: 10.1520/A0204_A0204M-12.10.1520/A0204_A0204M-17.2 For ASME Boiler and Pressure Vessel Code applications, see related Specification SA-204/SA 204M in Section II of that Code.3 For referencedASTM standa
13、rds, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an AST
14、M standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published
15、by ASTM is to be considered the official document.*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 States13.3 Coils are excluded from qualification to this specification until t
16、hey are processed into finished plates. Plates produced fromcoil means plates that have been cut to individual lengths from coil. The processor directly controls, or is responsible for, theoperations involved in the processing of coils into finished plates. Such operations include decoiling, levelin
17、g, cutting to length,testing, inspection, conditioning, heat treatment (if applicable), packaging, marking, loading for shipment, and certification.NOTE 1For plates produced from coil and furnished without heat treatment or with stress relieving only, three test results are reported for eachqualifyi
18、ng coil. Additional requirements regarding plates from coil are described in Specification A20/A20M.3.4 If the requirements of this specification are in conflict with the requirements of Specification A20/A20M, the requirementsof this specification shall prevail.4. Materials and Manufacture4.1 Steel
19、making PracticeThe steel shall be killed.5. Heat Treatment5.1 Plates 112 in. 40 mm and under in thickness are normally supplied in the as-rolled condition. The plates may be orderednormalized, normalized and tempered, or stress relieved or both. relieved.5.2 Plates over 112 in. 40 mm in thickness sh
20、all be normalized.normalized or normalized and tempered.6. Chemical Requirements6.1 The steel shall conform to the chemical requirements given in Table 1 unless otherwise modified in accordance withSupplementary Requirement S17, Vacuum Carbon-Deoxidized Steel, in Specification A20/A20M.7. Mechanical
21、 Requirements7.1 Tension Test RequirementsThe plates, as represented by the tension-test specimens, shall conform to the requirementsgiven in Table 2.8. Keywords8.1 alloy steel plate; molybdenum-alloy; pressure containing parts; pressure vessel steel plateTABLE 1 Chemical RequirementsElement Composi
22、tion, %Grade A Grade B Grade CCarbon, max:AUp to 1 in. 25 mmincl, in thickness0.18 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. 100 mmin thickness0.25 0.27 0.28Manganese, max:Heat analysis 0.90 0.90 0.90Product
23、 analysis 0.98 0.98 0.98Phosphorous, maxA 0.025 0.025 0.025Sulfur, maxA 0.025 0.025 0.025Silicon: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 0.450.60 0.450.60Product analysis 0.410.64 0.410.64 0.410.64A Applies to both heat and
24、 product analyses.A204/A204M 172SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order.Alist of standardized supplementary requirements for use at the option of the purchaser is includedin Specification A20/A20M. Those that are considered suitable
25、 for use with this specification are listedin this section by title.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat Treatment of Mechanical Test Coupons,S4.1 Additional Tension Test,S5. Charpy V-Notch Impact Test,S6. Drop Weight Test (for Material 0.625 in. 16 mm and over in T
26、hickness),S7. High-Temperature Tension Test,S8. Ultrasonic Examination in accordance with Specification A435/A435M,S9. Magnetic Particle Examination,S11. Ultrasonic Examination in accordance with Specification A577/A577M,S12. Ultrasonic Examination in accordance with Specification A578/A578M, andS17
27、. Vacuum Carbon-Deoxidized Steel.TABLE 2 Tensile RequirementsGrade A Grade B Grade Cksi MPa ksi MPa ksi MPaTensile strength 6585 450585 7090 485620 7595 515655Yield strength, minA 37 255 40 275 43 295Elongation in 8 in. 200 mm, min, %B 19 17 16Elongation in 2 in. 50 mm, min, %B 23 21 20A Determined
28、by either the 0.2 % offset method or the 0.5 % extension-under-load method.B See Specification A20/A20M for elongation adjustment.A204/A204M 173SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A204/A204M 03 (2007)A204/A204M 12) tha
29、t may impact the use of this standard. (Approved May 1,2012Nov. 1, 2017.)(1) Table 1 wasRevised 1.3 revised.to remove thickness guidelines.(2) SectionRevised 35.1 was editorialand 5.2 revised.to include the option of tempering.(3) Section 8 was added.ASTM International takes no position respecting t
30、he 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 rights, are entirely their own responsibility.This standard
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32、adquarters. 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 ASTM Committee on Standards, at the address shown below.This s
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