1、Designation: A656/A656M 12AStandard Specification forHot-Rolled Structural Steel, High-Strength Low-Alloy Platewith Improved Formability1This standard is issued under the fixed designation A656/A656M; 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers three types and five strengthgrades of high-strength low-allo
3、y, hot rolled structural steelplate for use in truck frames, brackets, crane booms, rail cars,and similar applications. Steels that conform to this specifica-tion offer improved formability. These steels are normallyfurnished in the as-rolled condition. The type and strengthgrade furnished is as agr
4、eed upon between the manufacturerand the purchaser. The types and strength grades are shown inthe tables.1.2 The maximum thickness of plates shall be as follows:Grade Plate Thickness, max,in. mm50 2 5060 112 4070 1 2580 1 2510012 131.3 The values stated in either inch-pound units or SI unitsare to b
5、e regarded as standard. Within the text, the SI units areshown in brackets. The values stated in each system are notexact equivalents; therefore, each system must be used inde-pendently of the other. Combining values from the two systemsmay result in nonconformance with this specification. SeeAppend
6、ix X3 of Specification A6/A6M for information onweldability.1.4 For plates produced from coil and furnished withoutheat treatment or with stress relieving only, the additionalrequirements, including additional testing requirements and thereporting of additional test results, of Specification A6/A6Ma
7、pply.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet Piling3. General Requirements for Delivery3.1 Plates furnished under this specification shall conformto the requirements of the current edition of
8、SpecificationA6/A6M, for the specific plate ordered, unless a conflict exists,in which case this specification shall prevail.3.2 Coils are excluded from qualification to this specifica-tion until they are processed into finished plates. Platesproduced from coil means plates that have been cut toindi
9、vidual lengths from a coil. The processor directly controls,or is responsible for, the operations involved in the processingof a coil into finished plates. Such operations include decoiling,leveling, cutting to length, testing, inspection, conditioning,heat treatment (if applicable), packaging, mark
10、ing, loading forshipment, and certification.NOTE 1For plates produced from coil and furnished without heattreatment or with stress relieving only, two test results are to be reportedfor each qualifying coil.Additional requirements regarding plate producedfrom coil are described in Specification A6/A
11、6M.4. Materials and Manufacture4.1 The steel shall be made to fine grain practice.5. Chemical Composition5.1 Heat analyses shall conform to the chemical require-ments given in Table 1. Dependent upon thickness, grade, andintended application, variations in the chemical compositionare permitted withi
12、n the limits given in Table 1 for theapplicable type. Where it is of particular importance, themanufacturer should be consulted for specific chemical com-position.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct respons
13、ibility of SubcommitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved Nov. 1, 2012. Published March 2013. Originallyapproved in 1972. Last previous edition approved in 2012 as A656/A656M 12.DOI: 10.1520/A0656_A0656M-12A.2For referenced ASTM standa
14、rds, 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 end of this standardCopyright ASTM Internat
15、ional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 Product AnalysisIf a product analysis is made, it shallconform to the requirements given in Table 1, subject to theproduct analysis tolerances of Specification A6/A6M.5.3 Where steel is to be welded, it is
16、 presupposed that awelding procedure suitable for the grade of steel and intendeduse or service will be utilized.5.4 Unless specifically ordered, the type is at the discretionof the producer.6. Tension Test6.1 The plates as represented by the test specimens shallconform to the requirements given in
17、Table 2.7. Keywords7.1 high-strength low-alloy steel; steel plates; structuralapplicationsSUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A656/A656M 12) that may impact the use of this standard. (Approved Nov. 1, 2012.)(1) Revised
18、 manganese information in Table 1, increasingmaximum permissible for grade 100.Committee A01 has identified the location of selected changes to this standard since the last issue(A656/A656M 11) that may impact the use of this standard. (Approved May 1, 2012.)(1) Revised nitrogen limit in Table 1 for
19、 all three types.TABLE 1 Chemical RequirementsNOTE 1An ellipsis (. . .) indicates that element is not defined for that Type.ElementsComposition, %Type 3 Type 7 Type 8Carbon, maxA0.18 0.18 0.18Manganese, maxA1.65 1.65 1.65Phosphorus, max 0.025 0.025 0.025Sulfur, max 0.035 0.035 0.035Silicon, max 0.60
20、 0.60 0.60Vanadium, max 0.08 0.15B0.15CNitrogen, max 0.030 0.030 0.030Columbium 0.0080.10 0.10 maxB0.10 maxCTitanium, max . . . . . . 0.15CAFor each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage points above the specified maximum formangane
21、se is permitted, up to a maximum of 1.75 % for Grades 50, 60, and 70; up to a maximum of 1.90 % for Grades 80 and 100; and up to a maximum of 2.10 % forGrade 100.BThe contents of columbium and vanadium shall additionally be in accordance with one of the following:columbium 0.0080.10 % with vanadium
22、0.008 %;columbium 0.008 % with vanadium 0.0080.15 %; orcolumbium 0.0080.10 % with vanadium 0.0080.15 % and columbium plus vanadium not in excess of 0.20 %.CThe sum of columbium, vanadium, and titanium shall be between 0.008 and 0.20 %.TABLE 2 Tensile RequirementsAGrade 50345Grade 60415Grade 70485Gra
23、de 80550Grade 100690Yield point, min, ksi MPa 50 345 60 415 70 485 80 550 100 690Tensile strength, min, ksi MPa 60 415 70 485 80 550 90 620 110 760Elongation in 8 in. 200 mm, min, % 20B17B14B12B12BElongation in 2 in. 50 mm, min, % 23B20B17B15B15BASee Specimen Orientation under the Tension Tests sect
24、ion of Specification A6/A6M.BFor plates wider than 24 in. 600 mm, the elongation requirement is reduced two percentage points for Grade 50 345 and three percentage points for Grades 60, 70,80, and 100 415, 485, 550, and 690. See Elongation Requirement Adjustments in the Tension Tests section of Spec
25、ification A6/A6M.A656/A656M 12A2ASTM 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 expressly advised that determination of the validity of any such patent rights, and the riskof
26、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 revised, either reapproved or withdrawn. Your comments are invited either for revision of this st
27、andard 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 attend. If you feel that your comments have not received a fair hearing you shouldmake your
28、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).A656/A656M 12A3
