1、Designation:A311/A311M04(Reapproved 2015)Standard Specification forCold-Drawn,Stress-Relieved Carbon Steel Bars Subject toMechanical Property Requirements1This standard is issued under the fixed designation A311/A311M;the number immediately following the designation indicates the yearof original ado
2、ption 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.Scope1.1 This specification covers two classes,nine grades,andfour conditions of stres
3、s-relieved cold-drawn carbon steel barsproduced to mechanical property requirements.One class,B,iscold drawn with higher than normal(heavy)drafts to providehigher strength levels,and four grades provide improvedmachinability.1.2 Supplementary Requirements,S1 through S6,of anoptional nature are provi
4、ded.1.3 The values stated in inch-pound units or SI units are tobe regarded as the standard.Within the text,the SI units areshown in brackets.The values stated in each system are notexact equivalents,therefore,each system must be used inde-pendently of the other.Combining values from the two systems
5、may result in nonconformance with the specification.2.Referenced Documents2.1 ASTM Standards:2A29/A29M Specification for General Requirements for SteelBars,Carbon and Alloy,Hot-WroughtA108 Specification for Steel Bar,Carbon and Alloy,Cold-FinishedA370 Test Methods and Definitions for Mechanical Test
6、ingof Steel ProductsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)3.Terminology3.1 Definitions:3.1.1 stress relievingheating to a suitable temperature,holding long enough to reduce residual stresses,and thencooling slowly enough to minimize the development of newre
7、sidual stresses.3.2 Definitions of Terms Specific to This Standard:3.2.1 heavy draftUsing higher than normal drafts(ap-proximately 10%through 35%reduction),followed by stressrelieving,produces higher tensile and yield strengths providedan appropriate composition is used;for example,mediumcarbon with
8、 normal or higher manganese content.4.Classification4.1 The bars are furnished in the following classes andgrades,and in the conditions shown in 6.4.4.1.1 Class ANormal-draft cold-drawn and stress-relievedrounds,squares,hexagons,and flats in the following grades:3GradesUNS Designations31018G10180103
9、5G103501045G104501050G105001541G154101117G111701137G113701141G114101144G114404.1.2 Class BHeavy-draft cold-drawn and stress-relievedrounds and hexagons in the following grades:GradeUNS Designations31045G104501050G105001541G154101141G114101144G114405.Ordering Information5.1 Orders for material under
10、this specification shouldinclude the following information as required to adequatelydescribe the desired material:5.1.1 Quantity(weight mass or number of pieces),5.1.2 Name of material(carbon steel bars,cold drawn,stressrelieved),5.1.3 Condition 8.3,5.1.4 Cross-sectional shape,5.1.5 Size,5.1.6 Lengt
11、h,1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 1947.Last previous edition approved in 201
12、0 as A311/A311M 04(2010).DOI:10.1520/A0311_A0311M-04R15.2For 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 standards Document Summary page onthe ASTM website.3New desig
13、nation established in accordance with Practice E527 and SAEJ 1086.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.7 Class and grade,5.1.8 Report of heat analysis,tensile properties Section 11,5.1.9 ASTM designation A311 or A311M,5.1.1
14、0 Application,5.1.11 Leaded steel,when required(see Table 1,footnoteA),5.1.12 Supplementary requirements,if any,and5.1.13 Additional requirements,if any.NOTE1Atypical ordering description is as follows:10 000 lb carbonsteel bars,cold drawn,stress relieved turned and polished,round 2.0 in.50.8 mm Dia
15、meter,10 to 12 ft 3048 to 3658 mm long,Class B,Grade1050,(UNS G 10500),fine grain,test reports required,ASTM A311/A311M dated_,hydraulic cylinder piston rods.5000kg carbon steel bars,cold drawn,stress relieved turned and polished round50 mm diameter,3050 to 3650 mm long,Class B,Grade 1050(UNS G10500
16、),fine grain,test reports required,ASTM A311Mdated _,hydraulic cylinder piston rods.6.Materials and Manufacture6.1 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 bysecondary melting using electroslag remelting or vacuum arcremelting.Where secondary melting is employed,the heatshall be defined as all of the ingots remelted f
