1、Designation: A 302/A 302M 03Standard Specification forPressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel1This standard is issued under the fixed designation A 302/A 302M; 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 (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*
3、1.1 This specification2covers manganese-molybdenum andmanganese-molybdenum-nickel alloy steel plates intended par-ticularly for welded boilers and other pressure vessels.1.2 Plates under this specification are available in fourgrades having different strength levels as follows:Grade Tensile Strength
4、, ksi MPa TypeA 7595 515655 Mn-MoB 80100 550690 Mn-MoC 80100 550690 Mn-Mo-NiD 80100 550690 Mn-Mo-Ni1.3 The maximum thickness of plates is limited only by thecapacity of the chemical composition to meet the specifiedmechanical property requirements. The minimum thickness islimited to 0.25 in. 6.5 mm.
5、1.4 The values stated in either 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 t
6、hetwo systems may result in nonconformance with the specifi-cation.2. Referenced Documents2.1 ASTM Standards:A 20/A20M Specification for General Requirements forSteel Plates for Pressure Vessels33. General Requirements and Ordering Information3.1 Plates supplied to this product specification shall c
7、on-form to Specification A 20/A 20M, which outlines the testingand retesting methods and procedures, permissible variationsin dimensions and mass, quality and repair of defects, marking,loading, and so forth.3.2 Specification A 20/A 20M also establishes the rules forordering information that should
8、be complied with whenpurchasing plates to this specification.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 th
9、e listed supplementaryrequirements in this specification 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
10、 lengths from coil. The processor directly controls, 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, load
11、ing forshipment, and certification.NOTE 1For plates 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 re
12、quirements of this specification are in conflictwith the requirements of Specification A 20/A 20M, the re-quirements of this specification shall prevail.4. Materials and Manufacture4.1 Steelmaking PracticeThe steel shall be killed andshall conform to the fine grain size requirement of Specifica-tion
13、 A 20/A 20M.5. Heat Treatment5.1 Plates 2 in. 50 mm and under in thickness are normallysupplied in the as-rolled condition. Plates may be orderednormalized or stress relieved, or both.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and
14、 is the direct responsibility of SubcommitteeA01.11 on Steel Plates for Boilers and Pressure Vessels.Current edition approved Sept. 10, 2003. Published October 2003. Originallyapproved in 1947. Last previous edition approved in 1997 as A 302/A 302M 97e1.2For ASME Boiler and Pressure Vessel Code appl
15、ications, see related Specifi-cation SA-302/SA-302M in Section II of that Code.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 State
16、s.5.2 Plates over 2 in. 50 mm in thickness shall be normal-ized.5.3 When normalizing plates 4 in. 100 mm or over inthickness, the cooling rate may be accelerated by air blasting orliquid quenching to obtain mechanical properties comparableto those developed by normalizing plates in the lesser thick-
17、nesses.5.4 If approved by the purchaser, for plates less than 4 in.100 mm in thickness, cooling rates faster than those obtainedby cooling in air are permissible for improvement of tough-ness, provided the plates are subsequently tempered in thetemperature range from 1100 to 1300 F 595 to 705 C.6. C
18、hemical Composition6.1 The steel shall conform to the chemical requirementsshown in Table 1 unless otherwise modified in accordance withSupplementary Requirement S17, Vacuum Carbon-DeoxidizedSteel, in Specification A 20/A 20M.7. Mechanical Properties7.1 Tension Test RequirementsThe plates, as repres
19、entedby the tension test specimens, shall conform to the require-ments given in Table 2.7.1.1 For accelerated cooled plates with a nominal thicknessof34 in. 20 mm or less, the 112-in. 40-mm wide rectangularspecimen may be used for the tension test, and the elongationmay be determined in a 2-in. 50-m
20、m gage length thatincludes the fracture and that shows the greatest elongation.8. Keywords8.1 alloy steel plate; pressure containing parts; pressurevessel steels; steel plates; steel plates for pressure vesselapplicationsTABLE 1 Chemical RequirementsComposition, %Elements Grade A Grade B Grade C Gra
21、de DCarbon, maxA:Up to 1 in. 25 mm,incl, in thickness0.20 0.20 0.20 0.20Over 1 to 2 in. 50mm, incl0.23 0.23 0.23 0.23Over 2 in. 50 mmin thickness0.25 0.25 0.25 0.25Manganese:Heat analysis 0.951.30 1.151.50 1.151.50 1.151.50Product analysis 0.871.41 1.071.62 1.071.62 1.071.62Phosphorus, maxA0.035 0.0
22、35 0.035 0.035Sulfur, maxA0.035 0.035 0.035 0.035Silicon:Heat analysis 0.150.40 0.150.40 0.150.40 0.150.40Product analysis 0.130.45 0.130.45 0.130.45 0.130.45Molybdenum:Heat analysis 0.450.60 0.450.60 0.450.60 0.450.60Product analysis 0.410.64 0.410.64 0.410.64 0.410.64Nickel:Heat analysis . . 0.400
23、.70 0.701.00Product analysis . . 0.370.73 0.671.03AApplies to both heat and product analyses.TABLE 2 Tensile RequirementsGrade A Grade B Grade C Grade DTensile strength, ksiMPa7595515655801005506908010055069080100550690Yield strength, min,ksi MPa45310503455034550345Elongation in 8 in.200 mm, min, %A
24、15 15 17 17Elongation in 2 in.50 mm, min, %A19 18 20 20ASee Specification A 20/A 20M for elongation adjustment.A 302/A 302M 032SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order. A list ofstandardized supplementary requirements for use at the
25、option of the purchaser is included inSpecification A 20/A 20M. Those that are considered suitable for use with this specification are listedbelow by title.S1. Vacuum Treatment,S2. Product Analysis,S3. Simulated Post-Weld Heat Treatment of MechanicalTest Coupons,S4.1 Additional Tension Test,S5. Char
26、py 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 accordance with Specifica-tion A 577/A 577M,S12. Ultrasonic Examination in accordan
27、ce with Specifica-tion A 578/A 578M, andS17. Vacuum Carbon-Deoxidized Steel.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue (A 302/A302M 97e1) that may impact the use of this standard.(1) 3.5 and Note 1 were added to be consistent
28、 with theterminology and 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 with any item mentionedin this standard. Users of this standard are expressly advised that
29、 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 technical committee and must be reviewed every five years andif not revised, either reapprov
30、ed 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 consideration at a meeting of theresponsible technical committee, which you may attend. If you fee
31、l 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 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 302/A 302M 033
