ASTM-A681-Standard-Specification-for-Tool-Steel-Alloy

Designation:A 681-08NTERNATIONALStandard Specification forTool Steels Alloy1This standard is issued under the fixed designation A 681;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 reapproval.This standard has been approved for use by agencies of the Department of Defense.1.ScopeMIL-STD-163 Steel Mill Products,Preparation for Ship-1.1 This specification covers the chemical,mechanical,andment and Storagephysical requirements for available wrought alloy tool steel2.3 Federal Standards:productsFed.Std.No.123 Marking and Shipment(Civil Agencies)41.2 These products,which include hot or cold finished bar,Fed.Std.No.183 Continuous Identification Marking ofplate,sheet,strip,rod,wire,or forgings,are normally fabri-Iron and Steel Products4cated into tools,dies,or fixtures.The selection of a material for2.4 Other Standards:a particular application will depend upon design,serviceSAE J1086 Recommended Practice for Numbering Metalsconditions,and desired properties.and Alloys (UNS)51.3 The values stated in inch-pound units are to be regarded3.Classificationas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information only3.1 Material in accordance with this specification is classi-and are not considered standard.fied by chemical composition.Types correspond to respectiveAISI designations.2.Referenced Documents3.1.1 Hot Work Tool Steels,Identification H:2.1 ASTM Standards:23.1.1.1 Types H10 to H19 are characterized by a controlledA 370 Test Methods and Definitions for Mechanical Testingchromium content along with other alloying elements.The firstof Steel Productsfour,containing molybdenum,offer excellent toughness andA 561 Practice for Macroetch Testing of Tool Steel Barshigh hardenability and are frequently used in cold workA 600 Specification for Tool Steel High Speedapplications requiring toughness at relatively high hardnessA 700 Practices for Packaging,Marking,and Loadinglevels.Methods for Steel Products for Shipment3.1.1.2 Types H21 to H26 are characterized by a controlledE3 Guide for Preparation of Metallographic Specimenstungsten content along with other alloying elements.TheseE 30 Test Methods for Chemical Analysis of Steel,Caststeels offer greater resistance to the softening effect of elevatedIron,Open-Hearth Iron,and Wrought Iron3service temperatures but exhibit a lower degree of toughness.E45 Test Methods for Determining the Inclusion Content3.1.1.3 Types H41 to H43 are low-carbon modifications ofof Steelmolybdenum high speed tool steels (Note 1)and have charac-E 59 Practice for Sampling Steel and Iron for Determinationteristics similar to the tungsten types.of Chemical CompositionNore 1-High-speed tool steels are covered in Specification A 600.E527 Practice for