1、NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information.Designation:A 331 95(Reapproved 2000)Standard Specification forSteel Bars,Alloy,Cold-Finished1This standard is issued under the fixed designat
2、ion A 331;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reappro
3、val.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification covers cold-finished alloy steel barsof grades and cross sections regarded as generally suitable forheat treatment,for machining into components,or for use inthe“as-finished”condition i
4、n constructional applications,orfor other similar purposes.Grades of steel are identified bygrade numbers or by chemical composition(see SpecificationsA 304 or A 322,or Practice A 400).1.2 Some end uses may require material superior to standardrequirements,involving one or more of the available desi
5、gna-tions shown in the supplementary requirements.These shallapply only when specified individually by the purchaser in theorder.2.Referenced Documents2.1 ASTM Standards:A 29/A 29M Specification for Steel Bars,Carbon andAlloy,Hot-Wrought and Cold-Finished,General Requirementsfor2A 304 Specification
6、for Carbon and Alloy Steel Bars Sub-ject to End-Quench Hardenability Requirements2A 322 Specification for Steel Bars,Alloy,Standard Grades2A 400 Practice for Steel Bars,Selection Guide,Composi-tion,and Mechanical Properties2E 45 Test Methods for Determining the Inclusion Contentof Steel3E 112 Test M
7、ethods for Determining the Average GrainSize32.2Other Documents:SAE Handbook4Fed.Std.No.66,Steel:Chemical Composition and Hard-enability5AISI Steel Products Manual for Alloy Steel:Semifinished,Hot-Rolled and Cold-Finished Bars63.Ordering Information3.1 Orders for material under the specification sho
8、uld in-clude the following information:3.1.1 Quantity(weight or number of pieces),3.1.2 Cross-sectional shape,3.1.3 Dimensions(size,length),3.1.4 Name of material(bars,alloy steel,cold-finished),3.1.5 ASTM designation and date of issue,3.1.6 Grade or chemical composition,3.1.7 Condition(4.4),3.1.8 H
9、eat treatment(4.5),3.1.9 Supplementary requirements,if any,3.1.10 Additional requirements,if any,3.1.11 End use,and3.1.12 Report of heat analysis,if required.4.Materials and Manufacture4.1 Melting PracticeThe steel shall be made by one ormore of the following primary processes:open-hearth,basic-oxyg
10、en,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 from a singleprimary heat.4
11、.2 DiscardA sufficient discard shall be made to securefreedom from injurious piping and undue segregation.4.3 MaterialThe bars shall be produced from hot-wroughtalloy steel bars(Specification A 322),or from alloy steel barssubject to end-quenched hardenability requirements(Specifi-cation A 304).4.4
12、ConditionThe bars shall be furnished in one of thefollowing surface finishes as specified by the purchaser:4.4.1 Rounds:4.4.1.1 Cold drawn.4.4.1.2 Cold drawn,turned,and polished.4.4.1.3 Cold drawn,ground,and polished.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainl
13、ess Steel,and Related Alloys and is the direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved Sept.10,1995.Published November 1995.Originallypublished as A 33150T.Last previous edition A 33190(1995)e1.2Annual Book of ASTM Standards,Vol 01.05.3Annual Book of ASTM Standards,Vol
14、03.01.4Available from Society of Automotive Engineers,400 Commonwealth Drive,Warrendale,PA 15096.5Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 19111-5094,Attn:NPODS.6Available from the American Iron and Steel Institute,150 E.42nd St.,NewYork,NY
15、 10017.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information.4.4.1.4 Cold drawn,turned
16、,ground,and polished.4.4.1.5 Hot wrought,turned,and polished.4.4.1.6 Hot wrought,turned,ground,and polished.4.4.1.7 Hot wrought,rough turned.4.4.2 Squares and HexagonsCold drawn.4.4.3 Flats:4.4.3.1 Cold drawn.4.4.3.2 Cold rolled.4.5 Heat TreatmentWhen required,the bars shall befurnished in one of the following heat-treated conditions asspecified by the purchaser:4.5.1 Annealed and cold finished,4.5.2 Spheroidize annealed and cold finished,4.5.3 Normalized and cold finished,4.5.4 Cold drawn and s