1、Designation:A68692(Reapproved 2016)Standard Specification forTool Steel,Carbon1This standard is issued under the fixed designation A686;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
2、 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.Scope1.1 This specification covers the chemical,mechanical,andphysical requirements
3、for available wrought carbon tool steelproducts.1.2 These products,which include hot-or cold-finished bar,plate,sheet,rod,wire,or forgings,are normally fabricated intotools,dies,or fixtures.The selection of a material for aparticular application will depend upon design,serviceconditions,and desired
4、properties.1.3 The values stated in inch-pound 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:2A370 Test Methods and Definitions
5、 for Mechanical Testingof Steel ProductsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA561 Practice for Macroetch Testing of Tool Steel BarsA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentE3 Guide for Preparation of Metallographic SpecimensE30 Test
6、 Methods for ChemicalAnalysis of Steel,Cast Iron,Open-Hearth Iron,and Wrought Iron(Withdrawn 1995)3E45 Test Methods for Determining the Inclusion Content ofSteelE59 Practice for Sampling Steel and Iron for Determinationof Chemical Composition(Withdrawn 1996)32.2 Military Standard:4MIL-STD-163 Steel
7、Mill Products,Preparation for Ship-ment and Storage2.3 Federal Standards:4Fed.Std.No.123 Marking for Shipment(Civil Agencies)Fed.Std.No.183 Continuous Identification Marking of Ironand Steel Products3.Classification3.1 Material in accordance with this specification is classi-fied by chemical composi
8、tion.Types correspond to respectiveAISI designations.3.1.1 Carbon Tool Steels,Identification WTypes W1,W2,and W5 are often referred to as water hardening tool steelssince they require rapid quenching rates to attain the necessaryhardness.Except in very small sizes they will harden with ahard case an
9、d a soft core.3.1.1.1 Type W1 is an unalloyed carbon steel available inseveral carbon ranges.3.1.1.2 Type W2 is characterized by a nominal vanadiumcontent of 0.25%and is also available in several carbonranges.3.1.1.3 Type W5 is characterized by a nominal chromiumcontent of 0.50%.3.1.1.4 A suffix fol
10、lowing the type designation is added todenote the minimum carbon content of the carbon range to bespecified.3.1.2 Types W1 and W2 are further classified by qualitylevels,namely,Grade A and Grade C.3.1.2.1 GradeAis sometimes referred to as Extra or Special.It is controlled for hardenability;the chemi
11、cal composition isheld to closest limits;and it is subject to rigid tests to ensureuniformity.Grade A is available with three degrees ofhardenability,namely,shallow hardening,regular hardening,and deep hardening.3.1.2.2 Grade C is sometimes referred to as Regular orStandard.It is intended for applic
12、ations that do not requirecontrolled hardenability and where some latitude in uniformityis permissible.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.29 on Tool Steels.Current edition
13、 approved March 1,2016.Published June 2016.Originallyapproved in 1973.Last previous edition approved in 2010 as A686 92(2010).DOI:10.1520/A0686-92R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards
14、 volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.Copyright A
15、STM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Ordering Information4.1 Orders for material under this specification shall includethe following information,as required to describe adequatelythe desired material:4.1.1 Class of material(carbon tool
16、steel),4.1.2 Type(W1,W2,W5),4.1.3 Suffix denoting carbon range(where applicable,suchas W19,W210,etc.),4.1.4 Grade and hardenability(where applicable,forexample,Grade A deep hardening,and so forth),4.1.5 Shape(sheet,plate,flat bar,round bar,square bar,hexagon bar,octagon,special shapes),4.1.6 Dimensions(thickness,width,diameter,length),4.1.7 Finish(hot rolled,forged,blasted or pickled,colddrawn,machined,ground,precision ground and polished),4.1.8 Condition(annealed,unannealed,hardened andtempered
