1、Designation:A69690a(Reapproved 2012)Standard Specification forSteel Bars,Carbon,Hot-Wrought or Cold-Finished,SpecialQuality,for Pressure Piping Components1This standard is issued under the fixed designation A696;the number immediately following the designation indicates the year oforiginal adoption
2、or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()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 Thi
3、s specification2covers hot-wrought and cold-finished special quality carbon steel bars,in straight lengthsonly,subject to mechanical property requirements and intendedfor use in manufacturing components for pressure piping andother pressure-containing applications.1.2 The values stated in inch-pound
4、 units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.2.Referenced Documents2.1 ASTM Standards:3A29/A29M Specification for Steel Bars,Carbon and Alloy,Hot-Wrought,General Requ
5、irements forA370 Test Methods and Definitions for Mechanical Testingof Steel Products3.Classification3.1 The bars are furnished in two grades as follows:3.1.1 Grade BTensile strength 60 000 psi(415 MPa),minimum;yield strength 35 000 psi(240 MPa),minimum.3.1.2 Grade CTensile strength 70 000 psi(485 M
6、Pa),minimum;yield strength 40 000 psi(275 MPa),minimum.3.2 The bars are intended for machining,welding,hotforming,and threading by machining or cold rolling.4.Ordering Information4.1 Orders for material under this specification shouldinclude the following information:4.1.1 Quantity(weight or number
7、of bars),4.1.2 Name of material(carbon steel bars),4.1.3 Condition:hot wrought or cold finished(5.4.1),4.1.4 Finish(if descaled required,so state)(9.1),4.1.5 Dimensions(diameter,thickness,width,and length),4.1.6 Cross section(round,square,hexagon),4.1.7 ASTM designation and date of issue,4.1.8 Grade
8、(Table 1 and Table 2),4.1.9 End use,and4.1.10 Additions to the specification and supplementaryrequirements,if required.NOTE1Atypical ordering description is as follows:10 000 lb,CarbonSteel Bars,Hot Wrought,Descaled,1.000-in.diameter by 10 ft,Round,ASTM A696 dated _,Grade B;Supplementary Requirement
9、 S1Straightness 0.125 in.in any 5 ft.5.Materials and Manufacture5.1 Melting PracticeThe steel shall be made by one ormore of the following primary processes:open-hearth,basic-oxygen,or electric-furnace.The primary melting may incor-porate separate degassing or refining,and may be followed bysecondar
10、y melting using electroslag remelting or vacuum arcremelting.Where secondary melting is employed,the heatshall be defined as all of the ingots remelted from a singleprimary heat.5.2 DeoxidationThe steel shall be fully killed.5.3 QualityThe bars shall be special quality.5.4 Hot or Cold Working:5.4.1
11、The bars shall be hot wrought or cold finished asspecified by the purchaser.5.4.2 Cold-finished bars reduced in cross-sectional areamore than 10%by cold drawing or rolling shall be heat treatedas specified in 5.5.2.5.5 Heat Treatment:5.5.1 Except as provided in 5.5.2,the bars shall be furnishedas-ho
12、t wrought or as-cold finished.5.5.2 Cold-finished bars cold worked in excess of 10%(see5.4.2)shall be stress relief annealed at not less than 1200F(649C),normalized,or fully annealed.The specific heattreatment shall be at the option of the manufacturer.1This specification is under the jurisdiction o
13、f ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved March 1,2012.Published April 2012.Originallyapproved in 1974.Last previous edition approved in 2006 as A696 90a(2006).DOI:10.1520/A0696-90AR12.2For
14、 ASME Boiler and Pressure Vessel Code Applications,see related Specifi-cation SA-696 in Section II of that Code.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the stand
15、ards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Chemical Composition6.1 The heat analysis shall conform to the requirements forchemical composition specified in Table 1.6.2 A product analysi
16、s of the steel may be made by thepurchaser and shall conform to the requirements of Table 1subject to the product analysis tolerances specified in Specifi-cation A29/A29M.7.Tensile Requirements7.1 Requirements:7.1.1 The material,as represented by the test specimens,shall conform to the tensile requirements specified in Table 2.7.1.2 A deduction from the percentage of elongation speci-fied in Table 2 of 1.0%shall be made for each 1.0 in.(25.4 mm)of specified diameter over 2.0 in.(51 mm)orfraction
