1、Designation:A30416Standard Specification forCarbon and Alloy Steel Bars Subject to End-QuenchHardenability Requirements1This standard is issued under the fixed designation A304;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、 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 U.S.Department of Defense.1.Scope*1.1 This specification covers hot-wor
3、ked alloy,carbon,andcarbon-boron steels in a variety of compositions and sizes,which may attain specified depth of hardening in the endquench test.These steel compositions are identified by thesuffix letter“H”added to the conventional grade number.1.2 This specification provides for analyses other t
4、han thoselisted under Tables 1 and 2.Special hardenability limits arealso permissible when approved by the purchaser and manu-facturer.1.3 The values stated in inch-pound units are to be regardedas standard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Sta
5、ndards:2A29/A29M Specification for General Requirements for SteelBars,Carbon and Alloy,Hot-WroughtA108 Specification for Steel Bar,Carbon and Alloy,Cold-FinishedA255 Test Methods for Determining Hardenability of SteelE112 Test Methods for Determining Average Grain SizeE527 Practice for Numbering Met
6、als and Alloys in theUnified Numbering System(UNS)2.2 Society of Automotive Engineers(SAE)Standard:3J 1086 Numbering Metals and Alloys3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 hardenabilitythe relative ability of a steel to hardenunder heat treatment becomes apparent in t
7、he degree to whichthe material hardens when quenched at different cooling rates.It is measured quantitatively,usually by noting the extent ordepth of hardening of a standard size and shape test specimenin a standardized quench.In the“end-quench”test the“depthof hardening”is the distance along the sp
8、ecimen from thequenched end to a given hardness.4.Ordering Information4.1 Orders for material under this specification shouldinclude the following information,in proper sequence:4.1.1 Quantity(weight),4.1.2 Name of material(alloy,carbon,or carbon-boronsteel),4.1.3 Cross-sectional shape,4.1.4 Size,4.
9、1.5 Length,4.1.6 Grade,4.1.7 End-quenched hardenability(see Section 9),4.1.8 Report of heat analysis,if desired(see Section 7),4.1.9 Special straightness,if required,4.1.10 ASTM designation and date of issue,4.1.11 End use or special requirements,and4.1.12 Leaded steel,when required.NOTE1A typical o
10、rdering description is as follows:10 000 lb,alloybars,round,4.0 in.dia by 10 ft,Grade 1340H,J 40 56=616in.,heatanalysis required,ASTM A304,dated _,worm gear.4.2 The purchaser shall specify the desired grade,includingthe suffix letter“H,”in accordance with Table 1 or Table 2.4.3 Band limits are shown
11、 graphically and as tabulations inFigs.2-87,inclusive.For specifications purposes,the tabulatedvalues of Rockwell C hardness are used.Values below 20Rockwell C hardness(20 HRC)are not specified because suchvalues are below the normal range of the C scale.The graphsare shown for convenience in estima
12、ting the hardness valuesobtainable at various locations on the end quench test bar andfor various locations in oil or water quenched rounds.Therelationship between end-quench distance and bar diameter isapproximate and should be used only as a guide.1This specification is under the jurisdiction of A
13、STM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.15 on Bars.Current edition approved Dec.1,2016.Published January 2017.Originallyapproved in 1947.Last previous edition approved in 2011 as A304 11.DOI:10.1520/A0304-16.2For referenced AS
14、TM 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 standard Document Summary page onthe ASTM website.3Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096,http:
15、/www.sae.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardizat
16、ion 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 TABLE 1 Chemical Requirements of Alloy H SteelsANOTE1Phosphorus and sulfur in electric-furnace steel(designated by the prefix letter“E”)is 0.025%,max.NOTE2Small quantities of certain elements are present in alloy steels that are not specified or required.These elements are considered as incidental
