1、Designation: A 678/A 678M 05Standard Specification forQuenched-and-Tempered Carbon and High-Strength Low-Alloy Structural Steel Plates1This standard is issued under the fixed designation A 678/A 678M; the number immediately following the designation indicates the yearof original adoption or, in the
2、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 specification covers quenched-and-tempered car-bon steel and high-strength low-al
3、loy steel plates of structuralquality for welded, riveted, or bolted construction.1.2 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 used.1.3 Plates under this specification are available in fourgrades as fol
4、lows:GradeYieldStrength,min, ksiMPaTensile Strength,ksi MPaMaximumThickness,in. mmA 50 345 7090 485620 112 40B 60 415 80100 550690 212 65CAA2 50D 75 515 90110 620760 3 75AVaries with thickness. See Table 1.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as s
5、tandard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system is tobe used independently of the other.2. Referenced Documents2.1 ASTM Standards:2A 6/A 6M Specification for General Requirements forRolled Structural Steel
6、 Bars, Plates, Shapes, and SheetPilingA 370 Test Methods and Definitions for Mechanical Testingof Steel Products3. 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 unless a con
7、flict exists, in which case thisspecification shall prevail.4. Materials and Manufacture4.1 The requirements for fine austenitic grain size in Speci-fication A 6/A 6M shall be met.5. Heat Treatment5.1 The plates shall be heat treated by heating to a tempera-ture that produces an austenitic structure
8、, but not exceeding1700F 925C, holding a sufficient time to attain uniformheat throughout the material, quenching in a suitable medium,and tempering at not less than 1100F 593C. The heat-treatment temperatures shall be reported in the test report.6. Chemical Composition6.1 The heat analysis shall co
9、nform to the requirementsgiven in Table 2 for the applicable grade.6.2 The product analysis shall conform to the requirementsgiven in Table 2, subject to the product analysis tolerances inSpecification A 6/A 6M.7. Tension Test7.1 The plates as represented by the test specimens shallconform to the re
10、quirements given in Table 1 specified for theapplicable grade.7.2 Number of TestsOne tension test shall be taken froma corner of each plate as heat treated.8. Keywords8.1 carbon; bolted construction; high-strength; low-alloy;plates; quenched; steel; structural steel; tempered; weldedconstruction1Thi
11、s 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 Sept. 1, 2005. Published October 2005. Ori
12、ginallyapproved in 1973. Last previous edition approved in 2000 as A 678/A 678M 00a.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 p
13、age 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.SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the pur
14、chase order or contract.Standardized supplementary requirements for use at the option of the purchaser are listed inSpecification A 6/A 6M. Those that are considered suitable for use with this specification are listed inthis section by title.S5. Charpy V-Notch Impact TestTABLE 1 Mechanical Requireme
15、ntsAGrade A Grade B Grade C Grade DYield strengthB, min. ksi MPaTo34 in. 20 mm, incl 50 345 60 415 75 515 75 515Over34 to 112 in. 20 to 40 mm, incl 50 345 60 415 70 485 75 515Over 112 to2in.40to50mm,inclC60 415 65 450 75 515Over 2 to 212 in. 50 to 65 mm, inclC60 415C75 515Over 212 to3in.65to75mm,inc
16、lCC75 515Tensile strength, ksi MPaTo34 in. 20 mm, incl 7090 485620 80100 550690 95115 655790 90110 620760Over34 to 112 in. 20 to 40 mm, incl 7090 485620 80100 550690 90110 620760 90110 620760Over 112 to2in.40to50mm,inclC80100 550690 85105 585720 90110 620760Over 2 to 212 in. 50 to 65 mm, inclC80100
17、550690C90110 620760Over 212 to3in.65to75mm,inclCC90110 620760Elongation in 2 in. 50 mm, min, %DE22 22 19 18ASee Specimen Orientation under the Tension Tests section of Specification A6/A6M.BMeasured at 0.2 % offset or 0.5 % extension under load.CThe size and grade is not described in this specificat
18、ion.DFor thickness of34 in. 20 mm and under, measured on 112-in. 40-mm wide full thickness rectangular specimen as shown in Fig. 3 of Test Methods and DefinitionsA 370. The elongation is measured in a 2-in. 50-mm gage length that includes the fracture and which shows the greatest elongation.EFor pla
19、tes wider than 24 in. 600 mm, the elongation requirement is reduced two percentage points. See elongation requirement adjustments in the Tension Testssection of Specification A 6/A 6M.TABLE 2 Chemical RequirementsNOTE 1 Small amounts of alloying elements may be present, but shall not exceed the foll
20、owing amounts: Cu-0.35; Ni-0.25; Cr-0.25; Mo-0.08.NOTE 2Where “. . . appears in this table there is no requirement.ElementComposition, %Grade AAGrade BAGrade CAGrade DACarbon, maxManganese0.16 0.20 0.22 0.22112 in. 40 mm and underin thickness0.901.50 0.701.35 1.001.60 1.151.50Over 112 to 212 in. 40
21、to65 mm, inclB1.001.60 1.001.60 1.151.50Over 212 to3in.65to75mm, inclBBB1.151.50Phosphorus, max 0.035 0.035 0.035 0.035Sulfur, max 0.04 0.04 0.04 0.04Silicon 0.150.50 0.150.50 0.200.50 0.150.50Vanadium . . . 0.040.11Columbium . . .CNitrogen, max . . . 0.03Copper, min, if specified 0.20 0.20 0.20 0.2
22、0ABoron may be added only by agreement between the manufacturer and the purchaser.BThis size and grade is not described in this specification.CColumbium may be present in the amount of 0.01 to 0.05 %.A 678/A 678M 052SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to t
23、his standard since the last issue(A 678/A 678M 00a) that may impact the use of this standard.(1) References to riveted construction have been removed.(2) In Table 2, the lower limit for nitrogen for Grade D wasremoved.ASTM International takes no position respecting the validity of any patent rights
24、asserted 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 tim
25、e by the 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 r
26、eceive 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 I
27、nternational, 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 678/A 678M 053
