1、Designation: A 945/A 945M 06e1Standard 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 designationA 945/A 945M; the number immediately following the design
2、ation 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 (e) indicates an editorial change since the last revision or reapproval.e1NOTECorrected the thickness value for Nic
3、kel editorially in October 2006.1. Scope*1.1 This specification 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,
4、 and toughness resulting from the specifiedalloying elements with 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 require
5、d to meet the specified mechanical require-ments.1.2 The maximum 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 suita
6、ble for the grade of steel and intendeduse or service will be utilized.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
7、system is to be usedindependently of the other without combining values in anyway.2. Referenced Documents2.1 ASTM Standards:2A 6/A6M Specification for General Requirements forRolled Structural Steel Bars, Plates, Shapes, and SheetPilingA 370 Test Methods and Definitions for Mechanical Testingof Stee
8、l ProductsA 673/A 673M Specification for Sampling Procedure forImpact Testing of Structural SteelA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic ShipmentE 208 Test Method for Conducting Drop-Weight Test toDetermine Nil-Ductility Transition Temperature of Fe
9、rriticSteels3. General Requirements for Delivery3.1 Plates furnished under this specification shall conformto the applicable requirements of the current edition of Speci-fication A 6/A 6M.3.2 If specified in the purchase order, plates ordered underthis specification shall be prepared for shipment in
10、 accordancewith the requirements of the current edition of SpecificationA 700.4. 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.4.3 Except as specified in 5.1 and 5.2,
11、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 plates and Grade 65 plates are normallyfurnished without heat treatment. The manufacturer has th
12、eoption to normalize or quench and temper such plates to meetthe mechanical requirements of Section 7 provided that theheat treatment is reported on the test report.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel, and Related Alloys and is under the direc
13、t responsibility ofSubcommitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling Stock, andShips.Current edition approved Sept. 1, 2006. Published September 2006. Originallyapproved in 1995. Last previous edition approved in 2005 as A 945/A 945M 05e1.2For referenced ASTM standards, visit th
14、e 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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100
15、Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 Grade 65 plates greater than 114 in. 32 mm inthickness 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
16、If a product analysis is made, it shall conform to therequirements given in Table 1, subject to the product analysistolerances in Specification A 6/A 6M.7. Mechanical Properties7.1 Tensile Properties:7.1.1 The plates as represented by the test specimens shallconform to the tensile properties given i
17、n Table 2 for theapplicable grade.7.1.2 For quenched and tempered plates, 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 A 370), the elongationmay be determined in a 2 in. 50-mm
18、gage length that includesthe fracture and shows the greatest elongation.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 A 673/A 673M. All plates shall be tested in accordancewith frequency
19、(P) Piece Testing.7.2.2 The plates as represented by the test specimens shallconform 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
20、 manufacturer, unless thetest orientation is specified in the purchase order.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 A 673 for sub-sizedCharpy test specimens.8. Report8.1 The manufactu
21、rer or processor shall report the results ofall tests required by this specification as identified in Section 18of Specification A 6/A 6M.8.2 The manufacturer shall furnish a certification that thematerial has been manufactured and tested in accordance withthe requirements of the material specificat
22、ion.9. Keywords9.1 as-rolled; high-strength; low-alloy; low-carbon; normal-ized; plate; quenched; restricted sulfur; ship applications; steel;structural applications; tempered; thermo-mechanical controlprocessed (TMCP); weight; welded constructionTABLE 1 Chemical RequirementsNOTEWhere “.” appears in
23、 this table, there is no requirement.Composition, %Element Thickness Grade 50 Grade 65Carbon (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
24、.501.00Chromium (max) All 0.20 0.20Molybdenum (max) All 0.08 0.08Copper (max) All 0.35 0.35Vanadium (max) All 0.10 0.10Columbium (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
25、or YieldStrengthAmin, ksi MPaTensile Strengthksi MPaMinimum Elongation, %BIn8in.200 mmIn2in.50 mm50 50 345 70 48590 620 21 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 A 370.BFor pla
26、tes wider than 24 in. 600 mm, the elongation requirement is reducedtwo percentage points. See elongation requirement adjustment in the TensionTests section of Specification A 6/A 6M.TABLE 3 Charpy V-Notch Impact Test RequirementsGradeTemperatureF CLongitudinal Specimens,min avgTransverse Specimens,m
27、in avgftlbf J ftlbf J50 40 40 30 41 20 2765 40 40 . . 70 95A 945/A 945M 06e12SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order or contract.Standardized supplementary requirements for use at the option of the purchaser are listed inSpecificati
28、on A 6/A 6M.ADDITIONAL SUPPLEMENTARY REQUIREMENTSIn addition, the following special supplementary requirements are also suitable for use with thisspecification:S78. First Article InspectionS78.1 The manufacturer shall demonstrate the uniformity ofproperties throughout the plate prior to the initial
29、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 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
30、 testfrom each area shall be oriented parallel to the direction ofrolling and one tensile test from each area shall be orientedtransverse 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
31、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 takentransverse to the principal direction of rolling at each location.S78.1.1.3 The Nil-ductility transition temperature shall bedetermined for t
32、he plate in accordance with Test MethodE 208.S78.2 A first article inspection report shall be prepared andsubmitted to the 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
33、themanufacturer and the purchaser.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A 945/A 945M 05) that may impact the use of this standard. (Approved Sept. 15, 2006.)(1) Changed minimum Nickel content from 0.4 % to 0.5 % forplate
34、s over 114 in. thickness in.(2) Added section 7.2.3, adding reference to Table 1 of Speci-fication A 673 for sub-size Charpy specimens.Committee A01 has identified the location of selected changes to this standard since the last issue (A 945/A 945M 00) thatmay impact the use of this standard. (Appro
35、ved Sept. 1, 2005.)(1) Changed maximum plate thickness for Grade 65 in section1.2.(2) Added section 4.2, to include requirement for Grade 65.(3) Added section 5.2 to include heat treat requirement forGrade 65 over 114 in.(4) Removed test orientation option for Grade 65 from section7.2.2.(5) Revised
36、Table 1 for Grade 65.(6) Changed impact values for Grade 65 in Table 3.(7) Deleted reference to Supplemental Requirement S5.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 exp
37、ressly 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 responsible technical committee and must be reviewed every five years andif not revis
38、ed, 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 consideration at a meeting of theresponsible technical committee, which you may
39、 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 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 945/A 945M 06e13
