1、Designation:A709/A709M18Standard Specification forStructural Steel for Bridges1This standard is issued under the fixed designation A709/A709M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in paren
2、theses 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 carbon and high-strength low-alloy steel structural shapes,plates,and bars,quenched andtempered alloy steel,and stainless stee
3、l for structural platesintended for use in bridges.Twelve grades are available in fiveyield strength levels as follows:Grade U.S.SIYield Strength,ksi MPa36 25036 25050 34550 34550S 345S50 345QST 50 QST 34550 345QST 50S QST 345S50 34550W 345W50 345HPS 50W HPS 345W50 34550CR 345CR50 345QST 65 QST45065
4、 450QST 70 QST48570 485HPS 70W HPS 485W70 485HPS 100W HPS 690W100 6901.1.1 Grades 36 250,50 345,50S 345S,50W 345W,50CR 345CR,QST 50 QST 345,QST 50S QST 345S,QST 65 QST 450,and QST 70 QST 485 are also includedin Specifications A36/A36M,A572/A572M,A992/A992M,A588/A588M,A1010/A1010M(UNS S41003),and A91
5、3/A913M respectively.When the requirements of Table 11 orTable 12 or the supplementary requirements of this specifica-tion are specified,they exceed the requirements of Specifica-tions A36/A36M,A572/A572M,A992/A992M,A588/A588M,A1010/A1010M(UNS S41003),and A913/A913M.Product availability is shown in
6、Table 1.1.1.2 Grades 50W 345W,50CR 345CR,HPS 50W HPS345W,HPS 70W HPS 485W,and HPS 100W HPS 690Whave enhanced atmospheric corrosion resistance(see 13.1.2).Product availability is shown in Table 1.1.2 Grade HPS 70W HPS 485W or HPS 100W HPS690W shall not be substituted for Grades 36 250,50 345,50S 345S
7、,50W 345W,or HPS 50W HPS 345W.Grade50W 345W,or HPS 50W HPS 345W shall not be substi-tuted for Grades 36 250,50 345 or 50S 345S withoutagreement between the purchaser and the supplier.1.3 When the steel is to be welded,it is presupposed that awelding procedure suitable for the grade of steel and inte
8、ndeduse or service will be utilized.See Appendix X3 of Specifica-tion A6/A6M for information on weldability.1.4 For structural products to be used as tension componentsrequiring notch toughness testing,standardized requirementsare provided in this standard,and they are based uponAmerican Association
9、 of State Highway and TransportationOfficials(AASHTO)requirements for both fracture critical andnon-fracture critical members.1.5 Supplementary requirements are available but shallapply only if specified in the purchase order.1.6 The values stated in either SI units or inch-pound unitsare to be rega
10、rded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 For structural products produced from coil and fur-nished wit
11、hout heat treatment or with stress relieving only,theadditional requirements,including additional testing require-ments and the reporting of additional test results,of Specifi-cation A6/A6M apply.1.8 This international standard was developed in accor-dance with internationally recognized principles
12、on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requireme
13、nts for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingA36/A36M Specification for Carbon Structural Steel1This 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 Ste
14、el for Bridges,Buildings,Rolling Stock and Ships.Current edition approved Nov.15,2018.Published December 2018.Originallyapproved in 1974.Last previous edition approved in 2017 as A709/A709M 171.DOI:10.1520/A0709_A0709M-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact A
15、STM 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 International,100 Barr Harbor Drive,PO Box C700,West Conshohocke
16、n,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 A370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA572/A572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural