1、Designation:A 1026 03Standard Specification forAlloy Steel Structural Shapes for Use in Building Framing1This standard is issued under the fixed designation A 1026;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification covers Grades 50 345 and 65 450
3、alloy steel“W”shapes(rolled wide flange shapes)intended foruse in building framing.This steel is a low carbon,copper-containing,alloy steel with a bainitic microstructure that isdeveloped through the control of chemical composition and theuse of thermo-mechanical rolling followed by air cooling.Thec
4、opper is present to enhance precipitation strengthening.1.2 When the steel is to be welded,a welding proceduresuitable for the grade of steel and intended use or service is tobe utilized.See Appendix X3 of Specification A 6/A 6M forinformation on weldability.1.3 The shapes are not intended to be gal
5、vanized or to bepost-weld heat treated at temperatures exceeding 750 F 400C.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI values are shown in brackets.The values stated in eachsystem are not exact equivalents;therefore,eac
6、h system is tobe used independently of the other,without combining valuesin any way.1.5 The text of this specification contains notes or footnotes,or both,that provide explanatory material;such notes andfootnotes,excluding those in tables and figures,do not containany mandatory requirements.2.Refere
7、nced Documents2.1 ASTM Standards:A 6/A 6MSpecification for General Requirements forRolled Structural Steel Bars,Plates,Shapes,and SheetPiling2A 673/A 673MSpecification for Sampling Procedure forImpact Testing of Structural Steel23.General Requirements3.1 Product furnished under this specification sh
8、all conformto the requirements of the current edition of Specification A6/A 6M for the ordered product,unless a conflict exists,inwhich case this specification shall prevail.4.Materials and Manufacture4.1 The steel shall be made to fine grain practice.4.2 The shapes shall be produced by a controlled
9、 processthat incorporates thermo-mechanical rolling followed by aircooling to result in a precipitation-strengthened bainitic micro-structure.5.Chemical Composition5.1 The heat analysis shall conform to the requirementsgiven in Table 1.5.2 The product analysis shall conform to the requirementsgiven
10、in Table 1 subject to the variations in product analysisthat are permitted in Specification A 6/A 6M.5.3 Where the amount of tin is less than 0.02%,it shall bepermissible for the heat or product analysis,whichever isapplicable,to be reported as“0.02%.”6.Mechanical Properties6.1 Tension TestThe produ
11、ct as represented by the testspecimens shall conform to the requirements for tensile prop-erties given in Table 2.6.2 Impact Test:6.2.1 Charpy V-notch tests shall be made in accordance withSpecification A 673/A 673M,Frequency H.6.2.2 Test results for full-size test specimens shall meet aminimum aver
12、age value of 40 ftlbf 54 J at 70 F 21 C ora lower test temperature as specified in the purchase order.7.Keywords7.1 alloy steel;bainitic steel;building framing;copper;precipitation strengthening;shapes;structural shapes;weldedconstruction1This specification is under the jurisdiction of ASTM Committe
13、e 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 April 10,2003.Published June 2003.2Annual Book of ASTM Standards,Vol 01.04.1Copyright ASTM International
14、,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.SUPPLEMENTARY 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 inSpecifi
15、cation A 6/A 6M.Those that are considered suitable for use with this specification are listed bytitle:S1.Vacuum TreatmentS3.Simulated Post-Weld Heat Treatment of MechanicalTest CouponsS8.Ultrasonic ExaminationS30.Charpy V-Notch Impact Test for Structural Shapes:Alternate Core LocationASTM Internatio
16、nal 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 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 com
