1、Designation: A945/A945M 16Standard 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 following the designation
2、 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. Scope*1.1 This specification covers high-stren
3、gth 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 improvedweldability, formability, and toughness resulting from thespecified alloying elements with limitations on ca
4、rbon, sulfur,and residual element contents. Grades 50 and 65 may beprovided as-rolled, control-rolled, thermo-mechanical controlprocessed (including accelerated cooling), normalized, orquenched and tempered as required to meet the specifiedmechanical requirements.1.2 The maximum thickness or weight
5、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 utilized.1.4 The values
6、 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 values in anyway.2.
7、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 for Im-pact Testing of Struc
8、tural SteelA700 Guide for Packaging, Marking, and Loading Methodsfor Steel Products for ShipmentE208 Test Method for Conducting Drop-Weight Test toDetermine Nil-Ductility Transition Temperature of Fer-ritic Steels3. General Requirements for Delivery3.1 Plates furnished under this specification shall
9、 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. Materials and Manufac
10、ture4.1 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.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,
11、or thermo-mechanical control pro-cessed (including accelerated cooling).5. Heat Treatment5.1 Grade 50 plates 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
12、7 provided that the heattreatment is reported on the test report.5.2 Grade 65 plates greater than 114 in. 32 mm in thick-ness shall be furnished in the quenched and tempered heattreatment.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys
13、and is under the direct responsibility ofSubcommittee A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock andShips.Current edition approved Sept. 1, 2016. Published September 2016. Originallyapproved in 1995. Last previous edition approved in 2011 as A945/A945M 06(2011). DOI: 10.1520/A0
14、945_A0945M-16.2For 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 standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the en
15、d of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. 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 gi
16、ven in Table 1, subject to the product analysistolerances 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 plate
17、s, one tension testshall be taken from a corner of 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.
18、7.2 Charpy V-Notch Impact Properties:7.2.1 Except as allowed by section 7.2.2, Charpy V-Notchimpact tests shall be conducted in accordance with Specifica-tion A673/A673M.All plates shall be tested in accordance withfrequency (P) Piece Testing.7.2.2 The plates as represented by the test specimens sha
19、llconform to the impact properties given in Table 3 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 orde
20、r.7.2.3 For material thicknesses below716 in. 10 mm, 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
21、 specification as identified in Sec-tion 18 of Specification 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; no
22、rmal-ized; plate; quenched; restricted sulfur; ship applications; steel;structural applications; tempered; thermo-mechanical controlprocessed (TMCP); weight; welded constructionTABLE 1 Chemical RequirementsNOTE 1Where “.” appears in this table, there is no requirement.Composition, %Element Thickness
23、 Grade 50 Grade 65ACarbon (max) All 0.10 0.10Manganese 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 0.08Co
24、pper (max) All 0.35 0.35Vanadium (max) All 0.10 0.10Columbium (Nio-bium) (max)BAll 0.05 0.05Aluminum (max) All 0.08 0.08Titanium All . 0.0070.020Nitrogen (max) All . 0.012Boron All .CAThe weld cracking parameter, Pcm, shall be less than or equal to 0.23:Pcm5 C1Si 301sMn 1 Cu 1 Crd 201Ni 601Mo 151V10
25、15BBColumbium and Niobium are interchangeable names for the same element.CBoron shall be analyzed and reported.TABLE 2 Tensile RequirementsGradeYield Point or YieldStrengthAmin, ksi MPaTensile Strengthksi MPaMinimum Elongation, %BIn8in.200 mmIn2in.50 mm50 50 345 70 48590 620 21 2465 65 450 78 540100
26、 690 18 22AMeasured at 0.2 % offset or 0.5 % extension under load as described in Section13 on yield strength of Test Methods and Definitions A370.BFor plates wider than 24 in. 600 mm, the elongation requirement is reduced twopercentage points. See elongation requirement adjustment in the Tension Te
27、stssection 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 162SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unles
28、s 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 suitable for use with thisspecifi
29、cation: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 order.S78.1.1.1 Tensile tests sha
30、ll 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 orientedtransverse to the principa
31、l 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 parallel and one set of specimens
32、 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 purchaser prior to shipment of
33、 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.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A
34、945/A945M 06 (2016) that may impact the use of this standard. (Approved Sept. 1, 2016.)(1) Added table footnotes A, B, and C to Table 1.(2) Added Boron as a mandatory element for reporting toTable 1.ASTM International takes no position respecting the validity of any patent rights asserted in connect
35、ion 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 the responsibl
36、e 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 careful cons
37、ideration 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 International, 100 B
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