1、Designation: A 738/A738M 05Standard Specification forPressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel, for Moderate and Lower Temperature Service1This standard is issued under the fixed designation A 738/A738M; 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. Scope*1.1 This specification2covers heat-treated carbon-manganese-
3、silicon steel plates intended for use in weldedpressure vessels at moderate and lower temperature service.1.2 Material under this specification is available in fourstrength levels, 75 ksi 515 MPa, 85 ksi 585 MPa, 80 ksi550 MPa, and 90 ksi 620 MPa minimum ultimate tensilestrengths.1.3 The maximum thi
4、ckness of plates is limited only by thecapacity of the chemical composition and heat treatment tomeet the specified mechanical property requirements; however,current practice normally limits the maximum thickness ofplates furnished under this specification to 6 in. 150 mm forGrade A, 4 in. 100 mm fo
5、r Grade B, and 6 in. 150 mm forGrade C. For Grades D and E, the maximum permitted nominalthickness is 1.5 in. 40 mm.1.4 Grade A is the material that, prior to 1984, was coveredby Specification A 738 without a grade designation.1.5 The values stated in either inch-pound units or SI unitsare to be reg
6、arded separately as standards. 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 nonconformance with the specifi-cation.2. Re
7、ferenced Documents2.1 ASTM Standards:3A 20/A20M Specification for General Requirements forSteel Plates for Pressure Vessels3. General Requirements and Ordering Information3.1 Plates supplied to this product specification shall con-form to the requirements of Specification A 20/A 20M, whichoutlines t
8、he testing and retesting methods and procedures,permissible variations in dimensions and mass, quality, repairof defects, marking, loading, etc.3.2 Specification A 20/A 20M also establishes the rules forcompliance to the ordering information when purchasingmaterial to this specification.1This specif
9、ication 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 and Pressure Vessels.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1976. Last prev
10、ious edition approved in 2003 as A 738/A 738M 03a.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-738/SA-738M in Section II of that Code.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For
11、Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.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.3.3 In
12、 addition to the basic requirements of this specifica-tion, certain supplementary requirements are available whenadditional control, testing, or examination is required to meetthe end use requirements.TABLE 1 Chemical RequirementsElementComposition, %Grade A Grade B Grade C Grade D Grade ECarbon, ma
13、xA0.24 0.20 0.20 0.10 0.12BManganese:Heat analysis1.5 in. 40 mm andunder1.50 max 0.901.50 1.50 max 1.00 1.60 1.10 1.60BOver 1.5 in. 40 mm to 1.50 max 0.901.50 1.50 maxCC2.5 in. 65 mm inclOver 2.5 in. 65 mm 1.60 max 0.901.60 1.60 maxProduct analysis1.5 in. 40 mm andunder1.62 max 0.841.62 1.62 max 0.9
14、21.72 1.021.72BOver 1.5 in. 40 mm to 1.62 max 0.841.62 1.62 maxCC2.5 in. 65 mm inclOver 2.5 in. 65 mm 1.72 max 0.841.72 1.72 maxPhosphorus, maxA0.035 0.030 0.025 0.015 0.015Sulfur, maxA0.035 0.030 0.025 0.006 0.006Silicon:Heat analysis 0.150.50 0.150.55 0.150.50 0.150.50 0.150.50Product analysis 0.1
15、30.55 0.130.60 0.130.55 0.130.55 0.130.55Copper, max:Heat analysis 0.35 0.35 0.35 0.35 0.35Product analysis 0.38 0.38 0.38 0.38 0.38Nickel, max:Heat analysis 0.50 0.60 0.50 0.60 0.70Product analysis 0.53 0.63 0.53 0.63 0.73Chromium, max:Heat analysis 0.25 0.30 0.25 0.25 0.30Product analysis 0.29 0.3
16、4 0.29 0.29 0.34Molybdenum, max:Heat analysis1.5 in. 40 mm andunder0.08 0.20 0.08 0.30 0.35Over 1.5 in. 40 mm 0.08 0.30 0.08CCProduct analysis1.5 in. 40 mm andunder0.09 0.21 0.09 0.33 0.38Over 1.5 in. 40 mm 0.09 0.33 0.09CCVanadium, max:Heat analysis 0.07D0.07 0.05 0.08 0.09Product analysis 0.08D0.0
17、8 0.05 0.09 0.10Columbium, max:Heat analysis 0.04D0.04E0.05 0.05Product analysis 0.05D0.05E0.06 0.06Columbium plus Vanadium,max:Heat analysis 0.08D0.08E0.11 0.12Product analysis 0.10D0.10E0.12 0.13Titanium, maxA. . .FGBoron, maxA. . . 0.0007 0.0007Aluminum, minA. . . 0.020 total or 0.020 total or0.0
18、15 acid 0.015 acidsolubleFsolubleGAApplies to both heat and product analyses.BFor each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum formanganese is permitted, up to a maximum of 1.85 % by heat analysis, an
19、d 1.99 % by product analysis.CNot applicable.DVanadium and columbium may be added only by agreement between the manufacturer and the purchaser.EFor Grade C, columbium is an unspecified element.FBy agreement between the manufacturer and the purchaser, the steel may be produced with titanium, in which
20、 case the minimum aluminum content shall not apply.If this option is exercised, the titanium content, by heat analysis, shall be 0.006 % to 0.03 %, and the titanium content for the heat and product analyses shall be reportedon the test report.GBy agreement between the manufacturer and the purchaser,
21、 the steel may be produced with titanium, in which case the minimum aluminum content shall not apply.If this option is exercised, the titanium content, by heat analysis, shall be 0.006 % to 0.03 % inclusive and the titanium content for the heat and product analyses shall bereported on the test repor
22、t.A 738/A738M 0523.4 The purchaser is referred to the listed supplementaryrequirements in this specification and to the supplementaryrequirements in Specification A 20/A 20M.4. Manufacture4.1 Steelmaking PracticeThe steel shall be killed andshall conform to the fine austenitic grain size requirement
23、 ofSpecification A 20/A 20M.5. Heat Treatment5.1 Grade A plates 2.5 in. 65 mm and under in thicknessshall be supplied in either the normalized or quenched andtempered condition.5.2 Grade A plates over 2.5 in. 65 mm in thickness andGrade B, Grade C, Grade D, and Grade E plates in allthicknesses shall
24、 be quenched-and-tempered.5.3 When plates are tempered, the minimum temperingtemperature shall be 1100F 595C.6. Chemical Requirements6.1 The steel shall conform to the chemical requirementsshown in Table 1 unless otherwise modified in accordance withSupplementary Requirement S 17, Vacuum Carbon-Deox
25、idized Steel in Specification A 20/A 20M.7. Mechanical Requirements7.1 Tension Test RequirementsThe plates as representedby the tension test specimens shall conform to the requirementsof Table 2.7.1.1 For nominal plate thicknesses of34 in. 20 mm andunder, the 1.5-in. 40-mm wide rectangular specimen
26、may beused for the tension test and the elongation may be determinedin a 2-in. 50-mm gage length that includes the fracture andshows the greatest elongation.8. Keywords8.1 pressure-containing parts; pressure vessel steel; steelplates; steel plates for pressure vessel applicationsTABLE 2 Tensile RequirementsNOTE 1t = plate nominal thickness.Grade A Grade B Grade C Grade D Grade ETensile strength, ksiMPa1.5 in. 40 mm or through the ASTM website(www.astm.org).A 738/A738M 054
