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ASTM A131 - A 131M - 14.pdf

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ASTM A131 - A 131M - 14.pdf

Designation A131/A131M − 14Standard Specification forStructural Steel for Ships1This standard is issued under the fixed designation A131/A131M; the number immediately following the designation indicates the yearof 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 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 specification covers structural steel plates, shapes,bars, and rivets intended primarily for use in ship construction.1.2 Material under this specification is available in thefollowing categories1.2.1 Ordinary StrengthGrades A, B, D, and E with aspecified minimum yield point of 34 ksi [235 MPa], and1.2.2 Higher StrengthGrades AH, DH, EH, and FH with aspecified minimum yield point of 46 ksi [315 MPa], 51 ksi[350 MPa], or 57 ksi [390 MPa].1.3 Shapes and bars are normally available as Grades A,AH32, and AH36. Other grades may be furnished by agree-ment between the purchaser and the manufacturer.1.4 The maximum thickness of products furnished underthis specification is 4 in. [100 mm] for plates and 2 in. [50 mm]for shapes and bars.1.5 When the steel is to be welded, it is presupposed that awelding procedure suitable for the grade of steel and intendeduse or service will be utilized. See Appendix X3 of Specifica-tion A6/A6M for information on weldability.1.6 The values stated in either inch-pound units or SI unitsare to be regarded separately as the standard. Within the text,the SI 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 this specifi-cation.2. Referenced Documents2.1 ASTM Standards2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsE112 Test Methods for Determining Average Grain Size3. Terminology3.1 Definitions of Terms Specific to This Standard3.1.1 control rolling controlled rolling, na hot deforma-tion process intended to provide austenite and hence ferritegrain refinement by careful control of the pass-by-passtemperature/reduction schedule at high temperature regimewhere austenite recrystallizes after each rolling pass or at lowertemperatures where the deformed austenite does not recrystal-lize between rolling passes, or both. In some cases, rolling mayextend below the temperature Ar3 at which the transforma-tion from austenite to ferrite begins, so the final rolling passesmay involve deformation in the two-phase austenite ferriteregion.3.1.2 thermo-mechanical controlled processing, na steeltreatment that consists of strict control of the steel temperatureand the rolling reduction. A high proportion of the rollingreduction is to be carried out close to or below the Ar3transformation temperature and may involve rolling towardsthe lower end of the temperature range of the intercriticaldual-phase region, thus permitting little if any recrystallizationof the austenite. The process may involve accelerated coolingon completion of rolling.4. Ordering Information4.1 Specification A6/A6M establishes the rules for theordering information that should be complied with whenpurchasing material to this specification.4.2 Additional ordering considerations specific to this speci-fication are4.2.1 Condition control rolled or thermo-mechanical con-trol processed, if applicable.5. Materials and Manufacture5.1 The steel shall be killed.5.2 Grades D, E,AH32,AH36,AH40, DH32, DH36, DH40,EH32, EH36, EH40, FH32, FH36, and FH40 shall be made1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved Oct. 1, 2014. Published October 2014. Originallyapproved in 1931. Last previous edition approved in 2013 as A131/A131M – 13.DOI 10.1520/A0131_A0131M-14.2For 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 standard’s Document Summary page onthe ASTM website.*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 States1Copyright by ASTM Intl all rights reserved;using a fine grain practice. For ordinary-strength grades,aluminum shall be used to obtain grain refinement. Forhigher-strength grades, aluminum, vanadium, or columbiumniobium may be used for grain refinement.5.3 Plates in all thicknesses ordered to Grade E shall benormalized, or thermo-mechanical control processed. Platesover 13⁄8 in. [35 mm] in thickness ordered to Grade D shall benormalized, control rolled, or thermo-mechanical control pro-cessed. See Table 1.5.4 Plates in all thicknesses ordered to Grades EH32 andEH36 shall be normalized, or thermo-mechanical controlprocessed. Plates in all thicknesses ordered to Grade EH40,FH32, FH36, and FH40 shall be normalized, thermo-mechanical control processed, or quenched and tempered.Plates ordered to Grades AH32, AH36, AH40, DH32, DH36,and DH40 shall be normalized, control rolled, thermo-mechanical control processed, or quenched and tempered whenso specified. See Table 2.5.5 In the case of shapes, the thicknesses referred to arethose of the flange. Heat treatment and rolling requirements forshapes and bars are given in Table 1 and Table 2.6. Chemical Requirements6.1 The heat analysis shall conform to the requirements forchemical composition given in Table 3 and Table 4.6.1.1 When specified, the steel shall conform on productanalysis to the requirements given in Table 3 and Table 4,subject to the product analysis tolerances in SpecificationA6/A6M.6.2 For thermo-mechanical control process steel, the carbonequivalent shall be determined from the heat analysis and shallconform to the requirements given in Table 5.7. Metallurgical Structure7.1 The steel grades indicated in 5.2 shall be made to finegrain practice, and the requirements for fine austenitic grainsize in Specification A6/A6M shall be met.7.2 Where the use of fine grain practice using columbium,vanadium, or combinations is permitted in 5.2, one or more ofthe following shall be met7.2.1 Minimum columbium niobium content of 0.020 or minimum vanadium content of 0.050 for each heat, or7.2.2 When vanadium and aluminum are used in combi-nation, minimum vanadium content of 0.030 and minimumacid-soluble aluminum content of 0.010 , or minimum totalaluminum content of 0.015 .7.2.3 When columbium niobium and aluminum are usedin combination, minimum columbium niobium content of0.010 and minimum acid-soluble aluminum content of0.010 , or minimum total aluminum content of 0.015 .7.2.4 A McQuaid-Ehn austenitic grain size of 5 or finer inaccordance with Test Methods E112 for each ladle of eachheat.8. Mechanical Requirements8.1 Tension Test8.1.1 Except as specified in the following paragraphs, thematerial as represented by the test specimens shall conform tothe tensile requirements prescribed in Table 6.8.1.1.1 Shapes less than 1 in.2[645 mm2] in cross section,and bars, other than flats, less than1⁄2 in. [12.5 mm] inthickness or diameter need not be subjected to tension tests bythe manufacturer, but chemistry consistent with the requiredtensile properties must be applied.8.1.1.2 The elongation requirement of Table 6 does notapply to floor plates with a raised pattern. However, for floorplates over1⁄2 in. [12.5 mm] in thickness, test specimens shallbe bent cold with the raised pattern on the inside of thespecimen through an angle of 180 without cracking whensubjected to a bend test in which the inside diameter is threetimes plate thickness. Sampling for bend testing shall be asspecified for the tension tests in 8.1.2.8.1.2 One tension test shall be made from each of twodifferent plates, shapes, or bars from each heat of structuralsteel unless the finished product from a heat is less than 50 tons[45 Mg], in which case one tension test is sufficient. If,TABLE 1 Condition of Supply and Frequency of Impact Tests for Ordinary-Strength Structural SteelGrade Deoxidation ProductACondition of SupplyBFrequency of Impact TestCThickness t , in. [mm]t 0.25 [6.4]t 1.0 [25]t 1.0 [25]t 1.375 [35]t 1.375 [35]t 2.0 [50]t 2.0 [50]t 4.0 [100]A KilledPA–N–E, TM –, CR 50 [45],AR 50 [45]S NADB KilledPA – A 50 [45]N 50 [45], TM 50 [45],CR 25 [23], AR 25 [23]S NADDKilled, Fine GrainPracticePA 50 [45], N 50 [45]N 50 [45],TM 50 [45],CR 50 [45]N 50 [45], TM 50 [45],CR 25 [23]S NADEKilled, Fine GrainPracticeP N P, TM P N P, TM PS N 25 [23], TM 25 [23], CR 15 [14] NADAProduct P plate; S shapes and barsBCondition of Supply A any condition; AR as-rolled; N normalized; CR control rolled; TM thermo-mechanical controlled processingCFrequency of Impact Test impact test lot size in tons [Mg] from each heat; – no impact test required; P each plate-as-rolledDCondition of supply is not applicableEImpact tests for Grade A are not required if material is produced using a fine grain practice and normalizedA131/A131M − 142Copyright by ASTM Intl all rights reserved;however, product from one heat differs3⁄8 in. [10 mm] or morein thickness or diameter, one tension test shall be made fromboth the thickest and the thinnest structural product rolled,regardless of the weight [mass] represented.8.1.3 For quenched and tempered steel, including GradesEH40, FH32, FH36, and FH40, one tension test shall be madeon each plate as quenched and tempered.TABLE 2 Condition of Supply and Frequency of Impact Tests for Higher-Strength Structural SteelGrade DeoxidationGrainRefiningElementProductACondition of SupplyBFrequency of Impact TestCThickness t , in. [mm]t 0.25 [6.4]t 0.5 [12.5]t 0.5[12.5]t 0.80[20]t 0.80 [20]t 1.0 [25]t 1.0 [25]t 1.375 [35]t 1.375 [35]t 2.0 [50]t 2.0 [50]t 4.0 [100]AH32AH36Killed, FineGrainPracticeCbVP A 50 [45] N 50 [45], TM 50 [45], CR 50 [45]N 50 [45], TM 50[45], CR 25 [23]S A 50 [45] N 50 [45], TM 50 [45], CR 50 [45], AR 25 [23] NADAl P A 50 [45]AR 25 [23], N50 [45] , TM50 [45], CR 50[45]N 50 [45], TM 50 [45],CR 50 [45]N 50 [45], TM 50[45], CR 25 [23]Al Ti S A 50 [45]AR 25 [23], N50 [45], TM 50[45], CR 50[45]N 50 [45], TM 50 [45], CR 50[45], AR 25 [23]NADDH32DH36Cb P A 50 [45] N 50 [45], TM 50 [45], CR 50 [45]N 50 [45], TM 50[45], CR 25 [23]V S A 50 [45] N 50 [45], TM 50 [45], CR 50 [45] NADAl P A 50 [45]AR 25 [23], N50 [45], TM 50[45], CR 50[45]N 50 [45], TM 50 [45],CR 50 [45]N 50 [45], TM 50[45], CR 25 [23]Al Ti S A 50 [45]AR 25 [23], N50 [45], TM 50[45], CR 50[45]N 50 [45], TM 50 [45],CR 50 [45]NADEH32EH36AnyP N P, TM P N P, TM PS N 25 [23], TM 25 [23], CR 15 [14] NADFH32FH36AnyP N P, TM P, QT P N P, TM P, QTS N 25 [23], TM 25 [23], QT 25 [23] NADAH40 AnyP A 50 [45] N 50 [45], TM 50 [45], CR 50 [45]N 50 [45], TM 50[45], QT PS A 50 [45] N 50 [45], TM 50 [45], CR 50 [45] NADDH40 AnyP N 50 [45], TM 50 [45], CR 50 [45] N 50 [45], TM 50[45], QT PS N 50 [45], TM 50 [45], CR 50 [45] NADEH40 AnyPN P, TM P, QT PNP,TMP,QT PS N 25 [23], TM 25 [23], CR 25 [23] NADFH40 AnyPN P, TM P, QQT PNP,TMP,QT PS N 25 [23], TM 25, CR 25 [23] NADAProduct P plate; S shapes and barsBCondition of Supply A any condition; AR as-rolled; TM thermo-mechanical controlled processing; CR control rolled; QT quenched and tempered; N normalizedCFrequency of Impact Test impact test lot size in tons [Mg] from each heat; P each plate-as-rolledDCondition of supply is not applicableA131/A131M − 143Copyright by ASTM Intl all rights reserved;8.2 Toughness Tests8.2.1 Charpy V-notch tests shall be made on Grade Amaterial over 2 in. [50 mm] in thickness, on Grade B materialover 1 in. [25 mm] in thickness and on material over1⁄4 in. [6.4mm] in thickness of Grades D, E, AH32, AH36, AH40, DH32,DH36, DH40, EH32, EH36, EH40, FH32, FH36, and FH40, asrequired by Table 1 and Table 2. The frequency of CharpyV-notch impact tests shall be as given in Table 1 and Table 2.The test results shall conform to the requirements given inTable 7.8.2.2 For Grades EH32, EH36, EH40, FH32, FH36, andFH40 plate material, one set of three impact specimens shall bemade from each plate-as-rolled.TABLE 3 Chemical Requirements for Ordinary-Strength Structural SteelElementChemical Composition heat analysis, max unless otherwise specifiedAGrade A Grade B Grade D Grade EDeoxidation and Thickness t , in. [mm]Killed or Semi-Killedt 2.0 in. [50 mm]Killedt 2.0 in. [50 mm]Killed or Semi-Killedt 2.0 in. [50 mm]Killedt 2.0 in. [50 mm]Killed, FineGrain PracticeBKilled, FineGrain PracticeBC 0.21C0.21 0.21 0.18Mn, min 2.5 C 0.60 0.60 0.70Si 0.50 0.35 0.10–0.35D0.10–0.35DP 0.035 0.035 0.035 0.035S 0.035 0.035 0.035 0.035NiEEEECrMoCuC Mn/6 0.40 0.40 0.40 0.40AIntentionally added elements are to be determined and reported.BGrade D steel over 1.0 in. [25 mm] and Grade E steel are to contain at least one of the grain refining elements in sufficient amount to meet the fine grain practicerequirements see Section 7.CA maximum carbon content of 0.23 is acceptable for Grade A shapes and bars.DWhere the content of acid soluble aluminum is not less than 0.015 , the minimum required silicon content does not apply.EThe contents of nickel, chromium, molybdenum, and copper are to be determined and reported. When the amount does not exceed 0.02 , these elements may bereported as 0.02 .TABLE 4 Chemical Requirements for Higher-Strength Structural SteelElementChemical CompositionAheat analysis, max unless otherwise specifiedGrades AH/DH/EH32, AH/DH/EH36,and AH/DH/EH40Grades FH32/36/40DeoxidationKilled, Fine Grain PracticeBKilled, Fine Grain PracticeBC 0.18 0.16Mn 0.90–1.60C0.90–1.60Si 0.10–0.50D0.10–0.50DP 0.035 0.025S 0.035 0.025Al acid soluble, minE,F0.015 0.015CbF0.02–0.05 0.02–0.05VF0.05–0.10 0.05–0.10Ti 0.02 0.02Cu 0.35 0.35Cr 0.20 0.20Ni 0.40 0.40Mo 0.08 0.08N ... 0.009GAThe contents of any other element intentionally added is to be determined and reported.BThe steel is to contain at least one of the grain refining elements in sufficient amount to meet the fine grain practice requirement see Section 7.CGrade AH 0.5 in. [12.5 mm] and under in thickness may have a minimum manganese content of 0.70

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