1、Designation: A945/A945M 06 (Reapproved 2011)Standard Specification forHigh-Strength Low-Alloy Structural Steel Plate with LowCarbon and Restricted Sulfur for Improved Weldability,Formability, and Toughness1This standard is issued under the fixed designation A945/A945M; the number immediately followi
2、ng 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.1. Scope1.1 This specification
3、covers high-strength low-alloy struc-tural steel plate intended for use in welded construction ofnaval ships where a savings in weight mass is important.Plates that conform to this specification offer improved weld-ability, formability, and toughness resulting from the specifiedalloying elements wit
4、h limitations on carbon, sulfur, andresidual element contents. Grades 50 and 65 may be providedas-rolled, control-rolled, thermo-mechanical control processed(including accelerated cooling), normalized, or quenched andtempered as required to meet the specified mechanical require-ments.1.2 The maximum
5、 thickness or weight mass of plates shallbe as follows:Grade Plate thickness,max, in. mmPlate weight mass,max, lb/ft2kg/m250 2 50 81.7 39365 212 65 102 5021.3 If the steel is to be welded, it is presupposed that awelding procedure suitable for the grade of steel and intendeduse or service will be ut
6、ilized.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text the SIunits are shown in brackets. The values stated in each systemare not exact equivalents, therefore, each system is to be usedindependently of the other without combining
7、 values in anyway.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA673/A673M Specification for Sampling Procedure forImpa
8、ct Testing of Structural SteelA700 Practices for Packaging, Marking, and Loading Meth-ods for Steel Products for ShipmentE208 Test Method for Conducting Drop-Weight Test toDetermine Nil-Ductility Transition Temperature of FerriticSteels3. General Requirements for Delivery3.1 Plates furnished under t
9、his specification shall conformto the applicable requirements of the current edition of Speci-fication A6/A6M.3.2 If specified in the purchase order, plates ordered underthis specification shall be prepared for shipment in accordancewith the requirements of the current edition of SpecificationA700.4
10、. Materials and Manufacture4.1 The steel shall be made to fine grain practice.4.2 Grade 65 plates less than 1 in. 25 mm in thicknessshall be provided from continuously cast product.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is
11、under the direct responsibility ofSubcommittee A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock andShips.Current edition approved April 1, 2011. Published May 2011. Originallyapproved in 1995. Last previous edition approved in 2006 as A945/A945M 061.DOI: 10.1520/A0945_A0945M-06R11.2F
12、or 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 standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C7
13、00, West Conshohocken, PA 19428-2959, United States.4.3 Except as specified in 5.1 and 5.2, the plates afterfinish-rolling shall be in one of the following conditions:as-rolled, control-rolled, or thermo-mechanical control pro-cessed (including accelerated cooling).5. Heat Treatment5.1 Grade 50 plat
14、es and Grade 65 plates are normally fur-nished without heat treatment. The manufacturer has the optionto normalize or quench and temper such plates to meet themechanical requirements of Section 7 provided that the heattreatment is reported on the test report.5.2 Grade 65 plates greater than 114 in.
15、32 mm in thick-ness shall be furnished in the quenched and tempered heattreatment.6. Chemical Composition6.1 The heat analysis shall conform to the requirementsgiven in Table 1.6.2 If a product analysis is made, it shall conform to therequirements given in Table 1, subject to the product analysistol
16、erances in Specification A6/A6M.7. Mechanical Properties7.1 Tensile Properties:7.1.1 The plates as represented by the test specimens shallconform to the tensile properties given in Table 2 for theapplicable grade.7.1.2 For quenched and tempered plates, one tension testshall be taken from a corner of
17、 each plate as heat treated.7.1.3 If measured on a 112-in. 40-mm wide specimen (seeFig. 3 of Test Methods and Definitions A370), the elongationmay be determined in a 2-in. 50-mm gage length thatincludes the fracture and shows the greatest elongation.7.2 Charpy V-Notch Impact Properties:7.2.1 Except
18、as allowed by section 7.2.2, Charpy V-Notchimpact tests shall be conducted in accordance with Specifica-tionA673/A673M.All plates shall be tested in accordance withfrequency (P) Piece Testing.7.2.2 The plates as represented by the test specimens shallconform to the impact properties given in Table 3
19、 for theapplicable grade. For Grade 50, the longitudinal axis of thespecimens may be parallel or transverse to the final direction ofrolling of the plate at the option of the manufacturer, unless thetest orientation is specified in the purchase order.7.2.3 For material thicknesses below716 in. 10 mm
20、, theabsorbed energy in Table 3 shall be reduced proportionally inaccordance with Table 1 in Specification A673/A673M forsub-sized Charpy test specimens.8. Report8.1 The manufacturer or processor shall report the results ofall tests required by this specification as identified in Sec-tion 18 of Spec
21、ification A6/A6M.8.2 The manufacturer shall furnish a certification that thematerial has been manufactured and tested in accordance withthe requirements of the material specification.9. Keywords9.1 as-rolled; high-strength; low-alloy; low-carbon; normal-ized; plate; quenched; restricted sulfur; ship
22、 applications; steel;structural applications; tempered; thermo-mechanical controlprocessed (TMCP); weight; welded constructionTABLE 1 Chemical RequirementsNOTEWhere “.” appears in this table, there is no requirement.Composition, %Element Thickness Grade 50 Grade 65Carbon (max)All 0.10 0.10Manganese
23、All 1.101.65 1.101.65Phosphorus (max)All 0.025 0.025Sulfur (max)All 0.010 0.010Silicon All 0.100.40 0.100.40Nickel 114 in. 32 mm max.0.40 max 0.40 maxOver 114 in. 32 mm 0.40 max 0.501.00Chromium (max) All 0.20 0.20Molybdenum (max) All 0.08 0.08Copper (max) All 0.35 0.35Vanadium (max) All 0.10 0.10Co
24、lumbium (max) All 0.05 0.05Aluminum (max) All 0.08 0.08Titanium All . 0.0070.020Nitrogen (max) All . 0.012Value corrected editorially.TABLE 2 Tensile RequirementsGradeYield Point or YieldStrengthAmin, ksi MPaTensile Strengthksi MPaMinimum Elongation, %BIn8in.200 mmIn2in.50 mm50 50 345 70 48590 620 2
25、1 2465 65 450 78 540100 690 18 22AMeasured at 0.2 % offset or 0.5 % extension under load as described inSection 13 on yield strength of Test Methods and Definitions A370.BFor plates wider than 24 in. 600 mm, the elongation requirement is reducedtwo percentage points. See elongation requirement adjus
26、tment in the TensionTests section of Specification A6/A6M.TABLE 3 Charpy V-Notch Impact Test RequirementsGradeTemperatureF CLongitudinal Specimens,min avgTransverse Specimens,min avgftlbf J ftlbf J50 40 40 30 41 20 2765 40 40 . . 70 95A945/A945M 06 (2011)2SUPPLEMENTARY REQUIREMENTSSupplementary requ
27、irements shall not apply unless specified in the purchase order or contract.Standardized supplementary requirements for use at the option of the purchaser are listed inSpecification A6/A6M.ADDITIONAL SUPPLEMENTARY REQUIREMENTSIn addition, the following special supplementary requirements are also sui
28、table for use with thisspecification:S78. First Article InspectionS78.1 The manufacturer shall demonstrate the uniformity ofproperties throughout the plate prior to the initial shipment ofthe order.S78.1.1 Testing shall be conducted on a single plate of themaximum thickness to be supplied to the ord
29、er.S78.1.1.1 Tensile tests shall be conducted on material takenfrom each end of the plate and along both edges near themid-length of the plate (four test locations). One tensile testfrom each area shall be oriented parallel to the direction ofrolling and one tensile test from each area shall be orie
30、ntedtransverse to the principal direction of rolling.S78.1.1.2 Charpy V-notch impact tests shall be conductedon material from each end of the plate and along both edgesnear the mid-length of the plate (four test locations). Impacttests shall be performed at 40F (40C) on one set ofspecimens taken par
31、allel and one set of specimens takentransverse to the principal direction of rolling at each location.S78.1.1.3 The Nil-ductility transition temperature shall bedetermined for the plate in accordance with Test Method E208.S78.2 A first article inspection report shall be prepared andsubmitted to the
32、purchaser prior to shipment of the order.S79. WeldabilityS79.1 Weldability tests shall be conducted. The type of testand the acceptance criteria shall be as agreed upon between themanufacturer and the purchaser.ASTM International takes no position respecting the validity of any patent rights asserte
33、d 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 is subject to revision at any time by th
34、e responsible technical 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
35、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 standard is copyrighted by ASTM Internat
36、ional, 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A945/A945M 06 (2011)3
