1、Designation: A913/A913M 14A913/A913M 14aStandard 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 indicat
2、es 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 () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers high-strength low-
3、alloy structural steel shapes in Grades 50 345, 60 415, 65 450 and 70 485,produced by the quenching and self-tempering process (QST). The shapes are intended for riveted, bolted or welded constructionof bridges, buildings and other structures.1.2 The QST process consists of in line heat treatment an
4、d cooling rate controls which result in mechanical properties in thefinished condition that are equivalent to those attained using heat treating processes which entail reheating after rolling. Adescription of the QST process is given in Appendix X1.1.3 Due to the inherent characteristics of the QST
5、process, the shapes 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 a welding procedure suitable for the grade of steel and intended useor service will be utilized. See Appendix X3 of Specification A6/A6M f
6、or information on weldability.1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be usedindependently of th
7、e other. Combining values from the two systems may result in nonconformance with this specification.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA673/A673M Specification for Sampling Procedu
8、re for Impact Testing of Structural SteelA898/A898M Specification for Straight Beam Ultrasonic Examination of Rolled Steel Structural Shapes3. General Requirements for Delivery3.1 Material furnished under this specification shall conform to the applicable requirements of the current edition ofSpecif
9、ication A6/A6M.4. Materials and Manufacture4.1 The shapes shall be produced by the quenching and self-tempering process (QST). Self-tempering temperature shall be aminimum of 1100F 600C and the self-tempering temperature for the material represented shall be reported on the mill testreport. See Appe
10、ndix X1 for Process Description.4.2 For grades 60 415, 65 450, and 70 485, the requirements for fine austenitic grain size in Specification A6/A6M shallbe met.5. Chemical Composition5.1 The chemical analysis of the heat shall conform to the requirements prescribed in Table 1.1 This specification is
11、under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.02on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved May 1, 2014May 15, 2014. Published May 2014. Originally approved
12、 in 1993. Last previous edition approved in 20112014 asA913/A913M 11.A913/A913M 14. DOI: 10.1520/A0913_A0913M-14.10.1520/A0913_A0913M-14A.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume i
13、nformation, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequatel
14、y depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM Inter
15、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.2 The steel shall conform on product analysis to the requirements prescribed in Table 1 subject to the product analysistolerances in Specification A6/A6M.6. Mechanical Properties6.1 Tensile PropertiesThe
16、material as represented by the test specimens shall conform to the tensile properties given in Table2.6.2 Charpy V-notch tests shall be made in accordance with Specification A673/A673M, Frequency H:6.2.1 The test results of full-size specimens shall meet an average value of 40 ft-lbf 54 J at 70F 21C
17、.6.2.1.1 Test reports for every heat supplied are required.6.2.2 Charpy V-notch test requirements exceeding the value specified in 6.2.1 or lower test temperatures are subject toagreement between the purchaser and the producer.7. Maximum Carbon Equivalent Requirement7.1 The carbon equivalent on heat
18、 analysis shall not exceed the limits listed in this section. The chemical analysis (heat analysis)of the elements that appear in the carbon equivalent formula 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
19、 70 485: 0.45 %7.2 Calculate the carbon equivalent using the following equation:CE 5C1Mn/61Cr1Mo1V!/51Cu1Ni!/158. Keywords8.1 high-strength low-alloy steel; QST; quenching and self-tempering process; steel shapes; structural shapes; structural steelSUPPLEMENTARY REQUIREMENTSSupplementary requirement
20、s 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 with this specification are listed bytitle:TABLE 1 Chemical Requirements (
21、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 0.030Silicon 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 0.2
22、5 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 MPa 8 in.200 mm, % 2 in.50 mm, %50 345 50 345 65 450 18 2160 415 60 415 75 520 16 1865 450 65 450 80 550
23、 15 1770 485 70 485 90 620 14 16A913/A913M 14a2S1. Vacuum Treatment.S2. Product Analysis.S3. Simulated Post-Weld Heat Treatment of Mechanical Test Coupons.S5. Charpy V-Notch Impact Test.S18. Maximum Tensile Strength.S30. Charpy V-Notch Impact Test for Structural Shapes: Alternate Core Location.ADDIT
24、IONAL 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 temperature forthe
25、 ingot or bloom represented shall be reported on the mill test report when such tests are required by the order.S8. Ultrasonic Examination:S8.1 Ultrasonic Examination in accordance with Specification A898/A898M.S32. Single Heat Bundles:S32.1 Bundles containing shapes or bars shall be from a single h
26、eat of steel.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 be 0.85.S77. Reduced SulfurGrade 65 450:Sulfur:S77.1 The Grade 65 450 shall be furnished with a maximum sulfur of 0.0
27、10 %. This may Sulfur of 0.010 % or less can bedesirable in material subjected to high through-thickness stresses.S77.2 The Grade 70 485 shall be furnished with a maximum sulfur of 0.010 %. Sulfur of 0.010 % or less can be desirablein material subjected to high through-thickness stresses.A913/A913M
28、14a3APPENDIX(Nonmandatory Information)X1. QUENCHING AND SELF-TEMPERING PROCESS (QST)X1.1 Introduction The quenching and self-tempering process, commonly referred to as “QST,” has evolved from the“thermo-mechanical control processes” (TMCP) that have been known and used for a number of years. QST, wh
29、ich is a variationof TMCP, produces fine-grained steel by a combination of chemical composition and integrated controls of manufacturingprocesses from ingot or bloom reheating to in-line interrupted quenching and self-tempering, thereby achieving the specifiedmechanical properties in the required pr
30、oduct thicknesses.X1.2 Outline of QSTGiven in Fig. X1.1.X1.2.1 Quenching and self-tempering (QST)-steels of fine grain size are manufactured by producing tempered martensite andvarying the pearlite or bainite, or both, volume fraction through time quenching (interrupted quenching in which the durati
31、on ofholding in the quenching medium (water) is controlled) in the temperature region above Ar3 (the temperature at which austenitebegins to transform to ferrite during cooling) to a minimum self-tempering temperature (STT, that is, the maximum surfacetemperature after quenching) of 1100F 600C in or
32、der to meet the specified requirements. Time quenching can be performedafter conventional rolling processes (AR) and (CR) or after thermomechanical controlled rolling (TMCR).FIG. X1.1 Schematic Diagrams of Thermo-Mechanical Control and Conventional ProcessA913/A913M 14a4X1.2.2 The selection of the r
33、olling process to be used is made by the producer depending upon the chemical composition, theproduct thickness, and the required properties.SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue(A913/A913M 14) that may impact the use of
34、 this standard. (Approved May 15, 2014.)(1) Revised and expanded Supplementary Requirement S77.SUMMARY OF CHANGESCommittee 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) Del
35、eted 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 advised that determination of the validity of any such patent rights, and the riskof infringem
36、ent 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 standard or
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38、wn 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/).A913/A913M 14a5
