1、Designation: A913/A913M 15Standard Specification forHigh-Strength Low-Alloy Steel Shapes of Structural Quality,Produced by Quenching and Self-Tempering Process (QST)1This standard is issued under the fixed designation A913/A913M; the number immediately following the designation indicates the yearof
2、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-strength low-alloy struc-tu
3、ral steel shapes in Grades 50 345, 60 415, 65 450 and 70485, produced by the quenching and self-tempering process(QST). The shapes are intended for riveted, bolted or weldedconstruction of bridges, buildings and other structures.1.2 The QST process consists of in line heat treatment andcooling rate
4、controls which result in mechanical properties inthe finished condition that are equivalent to those attainedusing heat treating processes which entail reheating afterrolling. A description of the QST process is given in AppendixX1.1.3 Due to the inherent characteristics of the QST process,the shape
5、s shall not be formed and post weld heat treated attemperatures exceeding 1100F 600C.1.4 When 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. See Appendix X3 of Specifica-tion A6/A6M for information on
6、weldability.1.5 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe used independently of the other. Combining v
7、alues from thetwo systems may result in nonconformance with this specifi-cation.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA673/A673M Specification for Sampling Procedure for Im-pact Testin
8、g of Structural SteelA898/A898M Specification for Straight Beam UltrasonicExamination of Rolled Steel Structural Shapes3. General Requirements for Delivery3.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A6/A6M.4. Ma
9、terials and Manufacture4.1 The shapes shall be produced by the quenching andself-tempering process (QST). Following rapid quenching toachieve a surface temperature below the martensite starttemperature, Ms, the shapes shall be allowed to auto-temper toa self-tempering temperature (STT) that shall be
10、 1100F595C minimum and 1300F 705C maximum. The STTshall be reported on the mill test report.4.2 For grades 60 415, 65 450, and 70 485, therequirements for fine austenitic grain size in SpecificationA6/A6M shall be met.5. Chemical Composition5.1 The chemical analysis of the heat shall conform to ther
11、equirements prescribed in Table 1.5.2 The steel shall conform on product analysis to therequirements prescribed in Table 1 subject to the productanalysis tolerances in Specification A6/A6M.6. Mechanical Properties6.1 Tensile PropertiesThe material as represented by thetest specimens shall conform to
12、 the tensile properties given inTable 2.6.2 Charpy V-notch tests shall be made in accordance withSpecification A673/A673M, Frequency H:6.2.1 The test results of full-size specimens shall meet anaverage value of 40 ft-lbf 54 J at 70F 21C.6.2.1.1 Test reports for every heat supplied are required.6.2.2
13、 Charpy V-notch test requirements exceeding the valuespecified in 6.2.1 or lower test temperatures are subject toagreement between the purchaser and the producer.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsi
14、bility of SubcommitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved July 1, 2015. Published August 2015. Originallyapproved in 1993. Last previous edition approved in 2014 as A913/A913M 14a.DOI: 10.1520/A0913_A0913M-15.2For referenced ASTM standa
15、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
16、ional, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17. Maximum Carbon Equivalent Requirement7.1 The carbon equivalent on heat analysis shall not exceedthe limits listed in this section. The chemical analysis (heatanalysis) of the elements that appear in the car
17、bon equivalentformula and the actual carbon equivalent shall be reported.Carbon equivalent limitsGrade 50 345: 0.38 %Grade 60 415: 0.40 %Grade 65 450: 0.43 %Grade 70 485: 0.45 %7.2 Calculate the carbon equivalent using the followingequation:CE 5 C1Mn/61Cr1Mo1V!/51Cu1Ni!/158. Keywords8.1 high-strengt
18、h low-alloy steel; QST; quenching and self-tempering process; steel shapes; structural shapes; structuralsteelSUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order or contract.Standardized supplementary requirements for use at the option of the p
19、urchaser are listed inSpecification A6/A6M. Those that are considered suitable for use with this specification are listed bytitle:S1. Vacuum Treatment.S2. Product Analysis.S3. Simulated Post-Weld Heat Treatment of MechanicalTest Coupons.S5. Charpy V-Notch Impact Test.S18. Maximum Tensile Strength.S3
20、0. Charpy V-Notch Impact Test for Structural Shapes:Alternate Core Location.ADDITIONAL SUPPLEMENTARY REQUIREMENTSIn addition, the following special supplementary requirements are also suitable for use with thisspecification:S4. Additional Tension Test:S4.1 One tension test shall be made per ingot or
21、 per bloom.The results obtained and the actual self-tempering temperaturefor the ingot or bloom represented shall be reported on the milltest report when such tests are required by the order.S8. Ultrasonic Examination:S8.1 Ultrasonic Examination in accordance with Specifica-tion A898/A898M.S32. Sing
22、le Heat Bundles:S32.1 Bundles containing shapes or bars shall be from asingle heat of steel.S59. On purchasers request and after contract, the manu-facturer shall provide weldability data from tests on previousproduction. Base material tested shall be representative ofmaterial furnished (similar com
23、position, melting and rollingpractice). The type of test, test variables and acceptance criteriashall be as agreed between the manufacturer and the purchaser.Weldability tests shall be provided to verify preheat tempera-ture requirements, adjusted for thickness, if a prequalifiedwelding procedure sp
24、ecification according to AWS D1.1-10,Table 3.2, Category D, or a similar provision in anotherwelding standard, is to be applied. The weldability data shallinclude a complete joint penetration groove weld according toAWS D1.1 and an oblique Y groove test according to AWSB4.0.S75. Maximum Yield Point
25、to Tensile Strength RatioGrade 50 345:S75.1 The maximum yield point shall be 65 ksi. 450.S75.2 The maximum yield to tensile strength ratio shall be0.85.TABLE 1 Chemical Requirements (Heat Analysis)NOTE 1Boron shall not be intentionally added. See SpecificationA6/A6M, Section 7.1.2 for additional gui
26、dance regarding boron.ElementMaximum content in %Grade 50345Grade 60415Grade 65450Grade 70485Carbon 0.12 0.12 0.12 0.12Manganese 1.60 1.60 1.60 1.60Phosphorus 0.030 0.030 0.030 0.030Sulfur 0.030 0.030 0.030 0.030Silicon 0.40 0.40 0.40 0.40Copper 0.45 0.35 0.35 0.45Nickel 0.25 0.25 0.25 0.25Chromium
27、0.25 0.25 0.25 0.25Molybdenum 0.07 0.07 0.07 0.07Columbium 0.05 0.05 0.05 0.05Vanadium 0.06 0.06 0.08 0.09TABLE 2 Tensile RequirementsGradeYield Point,min.TensileStrength, min.Elongation, minksi MPa ksi MPa8in.200 mm, %2in.50 mm, %50 345 50 345 65 450 18 2160 415 60 415 75 520 16 1865 450 65 450 80
28、550 15 1770 485 70 485 90 620 14 16A913/A913M 152S77. Reduced Sulfur:S77.1 The Grade 65 450 shall be furnished with a maxi-mum sulfur of 0.010 %. Sulfur of 0.010 % or less can bedesirable in material subjected to high through-thicknessstresses.S77.2 The Grade 70 485 shall be furnished with a maxi-mu
29、m sulfur of 0.010 %. Sulfur of 0.010 % or less can bedesirable in material subjected to high through-thicknessstresses.APPENDIX(Nonmandatory Information)X1. QUENCHING AND SELF-TEMPERING PROCESS (QST)X1.1 IntroductionThe quenching and self-temperingprocess, commonly referred to as “QST,” has evolved
30、from the“thermo-mechanical control processes” (TMCP) that havebeen known and used for a number of years. QST, which is avariation of TMCP, produces fine-grained steel by a combina-tion of chemical composition and integrated controls of manu-facturing processes from ingot or bloom reheating to in-lin
31、einterrupted quenching and self-tempering, thereby achievingthe specified mechanical properties in the required productthicknesses.X1.2 Outline of QSTGiven in Fig. X1.1.X1.2.1 Quenching and Self-Tempering (QST) steels of finegrain size are manufactured by producing tempered martensiteand varying the
32、 pearlite or bainite, or both. This is accom-plished through interrupted water quenching in which theduration of the quench is controlled after the final reductionpass while still in the temperature region above the Ar3. Rapidquenching is continued until the maximum surface temperatureof the steel i
33、s below the Ms. Tempering occurs as the coreFIG. X1.1 Schematic Diagrams of Thermo-Mechanical Control and Conventional ProcessA913/A913M 153temperature causes the surface temperature to gradually re-bound to a proper temperature, defined as the self-temperingtemperature (STT), to achieve desired pro
34、perties.X1.2.2 The selection of the rolling process to be used ismade by the producer depending upon the chemicalcomposition, the product thickness, and the required proper-ties.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A913
35、/A913M 14a) that may impact the use of this standard. (Approved July 1, 2015.)(1) Revised 4.(2) Revised Table 1.(3) Added Supplementary Requirement S59.(4) Revised X1.2.1.Committee A01 has identified the location of selected changes to this standard since the last issue(A913/A913M 14) that may impac
36、t the use of this standard. (Approved May 15, 2014.)(1) Revised and expanded Supplementary Requirement S77.Committee A01 has identified the location of selected changes to this standard since the last issue(A913/A913M 11) that may impact the use of this standard. (Approved May 1, 2014.)(1) Deleted f
37、ootnote from 1.1.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 expressly advised that determination of the validity of any such patent rights, and the riskof infringement of
38、 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 standard or for a
39、dditional 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 views known to
40、 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
41、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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 154
