1、Designation: A913/A913M 14Standard 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). Self-tempering temperatureshall be a minimum of 1100F 600C and the self-temperingtemperature for the material represented shall be reported onthe mill test report. See Appendix X1 for Process De
10、scription.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 therequirements prescribed in Table 1.5.2 The steel shall conform on product analysis
11、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 the tensile properties given inTable 2.6.2 Charpy V-notch tests shall be made in
12、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 Charpy V-notch test requirements exceeding the valuespecified in 6.2.1 or lower t
13、est 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 responsibility of SubcommitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling S
14、tock and Ships.Current edition approved May 1, 2014. Published May 2014. Originallyapproved in 1993. Last previous edition approved in 2011 as A913/A913M 11.DOI: 10.1520/A0913_A0913M-14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceas
15、tm.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 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United Sta
16、tes17. 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 carbon equivalentformula and the actual carbon equivalent shall be reported.Carbon equival
17、ent 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-strength low-alloy steel; QST; quenching and self-tempering process; steel shapes; structural
18、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 purchaser are listed inSpecification A6/A6M. Those that are considered suitable for use
19、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.S30. Charpy V-Notch Impact Test for Structural Shapes:Alternate Core Location.ADDITIONAL
20、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 per bloom.The results obtained and the actual self-tempering temperaturefor the ingot
21、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. Single Heat Bundles:S32.1 Bundles containing shapes or bars shall be from asingle heat of s
22、teel.S75. Maximum Yield Point 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.S77. Reduced SulfurGrade 65 450:S77.1 The Grade 65 450 shall be furnished with a maxi-mum sulfur of 0.010 %. This may
23、be desirable in materialsubjected to high through-thickness stresses.TABLE 1 Chemical Requirements (Heat Analysis)ElementMaximum content in %Grade 50345Grade 60415Grade 65450Grade 70485Carbon 0.12 0.14 0.16 0.16Manganese 1.60 1.60 1.60 1.60Phosphorus 0.040 0.030 0.030 0.040Sulfur 0.030 0.030 0.030 0
24、.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 0.25 0.25 0.25 0.25Molybdenum 0.07 0.07 0.07 0.07Columbium 0.05 0.04 0.05 0.05Vanadium 0.06 0.06 0.08 0.09TABLE 2 Tensile RequirementsGradeYield Point,min.TensileStrength, min.Elongation, minksi MPa ksi MPa8i
25、n.200 mm, %2in.50 mm, %50 345 50 345 65 450 18 2160 415 60 415 75 520 16 1865 450 65 450 80 550 15 1770 485 70 485 90 620 14 16A913/A913M 142APPENDIX(Nonmandatory Information)X1. QUENCHING AND SELF-TEMPERING PROCESS (QST)X1.1 Introduction The quenching and self-temperingprocess, commonly referred to
26、 as “QST,” has evolved 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 bl
27、oom reheating to in-lineinterrupted 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 ma
28、rtensiteand varying the pearlite or bainite, or both, volume fractionthrough time quenching (interrupted quenching in which theduration of holding in the quenching medium (water) iscontrolled) in the temperature region above Ar3 (the tempera-ture at which austenite begins to transform to ferrite dur
29、ingcooling) to a minimum self-tempering temperature (STT, thatis, the maximum surface temperature after quenching) of1100F 600C in order to meet the specified requirements.Time quenching can be performed after conventional rollingprocesses (AR) and (CR) or after thermomechanical controlledrolling (T
30、MCR).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 requiredproperties.A913/A913M 143SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last i
31、ssue(A913/A913M 11) that may impact the use of this standard. (Approved May 1, 2014.)(1) Deleted footnote 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 ad
32、vised 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 revised, eithe
33、r 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 attend.
34、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. Indiv
35、idual 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/).FIG. X1.1 Schematic Diagrams of Thermo-Mechanical Control and Conventional ProcessA913/A913M 144
