ASTM A681-07e1
(Specification)Standard Specification for Tool Steels Alloy
Standard Specification for Tool Steels Alloy
ABSTRACT
This specification covers the chemical, mechanical, and physical requirements for available wrought alloy tool steel products. The material shall be made by an electric melting process. It shall be made from ingots that have been reduced in cross section in such a manner and to such a degree as to ensure proper refinement of the ingot structure. Chemical composition, hardness, macrostructure and decarburization of the material shall conform to the requirements in accordance to the referenced ASTM documents itemized herein.
SCOPE
1.1 This specification covers the chemical, mechanical, and physical requirements for available wrought alloy tool steel products.
1.2 These products, which include hot or cold finished bar, plate, sheet, strip, rod, wire, or forgings, are normally fabricated into tools, dies, or fixtures. The selection of a material for a particular application will depend upon design, service conditions, and desired properties.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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Designation: A 681 – 07
Standard Specification for
1
Tool Steels Alloy
This standard is issued under the fixed designation A 681; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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
e NOTE—Table 7 and Table 8 corrected editorially in May 2008.
1. Scope 2.2 Military Standard:
MIL-STD-163 Steel Mill Products, Preparation for Ship-
1.1 This specification covers the chemical, mechanical, and
4
ment and Storage
physical requirements for available wrought alloy tool steel
2.3 Federal Standards:
products.
4
Fed. Std. No. 123 Marking and Shipment (CivilAgencies)
1.2 These products, which include hot or cold finished bar,
Fed. Std. No. 183 Continuous Identification Marking of
plate, sheet, strip, rod, wire, or forgings, are normally fabri-
4
Iron and Steel Products
catedintotools,dies,orfixtures.Theselectionofamaterialfor
2.4 Other Standards:
a particular application will depend upon design, service
SAE J1086 Recommended Practice for Numbering Metals
conditions, and desired properties.
5
and Alloys (UNS)
1.3 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
3. Classification
conversions to SI units that are provided for information only
3.1 Material in accordance with this specification is classi-
and are not considered standard.
fied by chemical composition. Types correspond to respective
2. Referenced Documents AISI designations.
2
3.1.1 Hot Work Tool Steels, Identification H:
2.1 ASTM Standards:
3.1.1.1 Types H10 to H19 are characterized by a controlled
A 370 Test Methods and Definitions for MechanicalTesting
chromium content along with other alloying elements.The first
of Steel Products
four, containing molybdenum, offer excellent toughness and
A 561 Practice for Macroetch Testing of Tool Steel Bars
high hardenability and are frequently used in cold work
A 600 Specification for Tool Steel High Speed
applications requiring toughness at relatively high hardness
A 700 Practices for Packaging, Marking, and Loading
levels.
Methods for Steel Products for Shipment
3.1.1.2 Types H21 to H26 are characterized by a controlled
E3 Guide for Preparation of Metallographic Specimens
tungsten content along with other alloying elements. These
E30 Test Methods for Chemical Analysis of Steel, Cast
3
steels offer greater resistance to the softening effect of elevated
Iron, Open-Hearth Iron, and Wrought Iron
service temperatures but exhibit a lower degree of toughness.
E45 Test Methods for Determining the Inclusion Content
3.1.1.3 Types H41 to H43 are low-carbon modifications of
of Steel
molybdenum high speed tool steels (Note 1) and have charac-
E59 PracticeforSamplingSteelandIronforDetermination
3
teristics similar to the tungsten types.
of Chemical Composition
E 527 Practice for Numbering Metals and Alloys in the
NOTE 1—High-speed tool steels are covered in Specification A 600.
Unified Numbering System (UNS)
3.1.2 Cold Work Tool Steels, Identification A—Types A2 to
A10 cover a wide range of carbon and alloy contents but all
1
have high hardenability and may be hardened in air. The low
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
carbon Types A8 and A9 have less wear resistance but offer
A01.29 on Tool Steels.
Current edition approved Sept. 1, 2007. Published September 2007. Originally
approved in 1973. Last previous edition approved in 2004 as A 681 – 94 (2004).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from the Standardization Documents, Order Desk, Bldg. 4, Section
Standards volume information, refer to the standard’s Document Summary page on D 700 Robbins Ave. Philadelphia, PA 19111-5094 Attn: NPODS.
5
the ASTM website. Available from the Society ofAutomotive Engineers, 400 Commonwelth drive,
3
Withdrawn. Warrendale, PA 15096.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
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A 681–07
greater toughness than others in this group.TypeA7, with high 6.2 Analysis may be made by the purchaser from finished
carbon and vanadium, offers exceptional wear resistance but at bars and forgings by machining off the entire cross section and
a very low level of toughness. drilling parallel to the axis of the bar or forging at any point
3.1.3 Cold
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
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Designation:A 681–94 (Reapproved 1999) Designation: A 681 – 07
Standard Specification for
1
Tool Steels Alloy
This standard is issued under the fixed designation A 681; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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
e NOTE—Table 7 and Table 8 corrected editorially in May 2008.
1. Scope
1.1 This specification covers the chemical, mechanical, and physical requirements for available wrought alloy tool steel
products.
1.2 These products, which include hot or cold finished bar, plate, sheet, strip, rod, wire, or forgings, are normally fabricated into
tools, dies, or fixtures. The selection of a material for a particular application will depend upon design, service conditions, and
desired properties.
1.3The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for
information only.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A 370 Test Methods and Definitions for Mechanical Testing of Steel Products
A 561 Practice for Macroetch Testing of Tool Steel Bars
A 600 Specification for Tool Steel High Speed
A 700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Domestic Shipment
E 3Methods of Preparation of Metallographic Specimens Guide for Preparation of Metallographic Specimens
3
E 30 Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron
E 45 Test Methods for Determining the Inclusion Content of Steel
0
E 59 Practice for Sampling Steel and Iron for Determination of Chemical Composition
E 527Practice for Numbering Metals and Alloys (UNS) Practice for Numbering Metals and Alloys in the Unified Numbering
System (UNS)
2.2 Military Standard:
4
MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage
2.3 Federal Standards:
4
Fed. Std. No. 123 Marking and Shipment (Civil Agencies)
4
Fed. Std. No. 183 Continuous Identification Marking of Iron and Steel Products
2.4 Other Standards:
5
SAE J1086 Recommended Practice for Numbering Metals and Alloys (UNS)
1
This specification is under the jurisdiction of ASTM Committee A-1A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.29 on Tool Steels.
Current edition approved June 15, 1994.Sept. 1, 2007. PublishedAugust 1994.September 2007. Originally published asA681–73.approved in 1973. Last previous edition
approved in 2004 as A 681 – 94 (2004).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 01.03.volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Withdrawn.
4
Annual Book of ASTM Standards, Vol 03.01.
4
Available from the Standardization Documents, Order Desk, Bldg. 4, Section D 700 Robbins Ave. Philadelphia, PA 19111-5094 Attn: NPODS.
5
Annual Book of ASTM Standards, Vol 03.05.
5
Available from the Society of Automotive Engineers, 400 Commonwelth drive, Warrendale, PA 15096.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
e1
A 681–07
3. Classification
3.1 Material in accordance with this specification is classified by chemical composition. Types correspond to respective AISI
designations.
3.1.1 Hot Work Tool Steels, Identification H:
3.1.1.1 TypesH10toH19arecharacterizedbyacontrolledchromiumcontentalongwithotheralloyingelements.Thefirstfour,
containing molybdenum, offer excellent toughness and high hardenability and are frequently used in cold work applications
requiring toughness at relatively high hardness levels.
3.1.1.2 Types H21 to H26 are characterized by a controlled tungsten content along with other alloying elements. These steels
offer greater resistance to the softening effect of elevated service temperatures but exhibit a lower degree of toughness.
3.1.1.3 Types H41 to H43 are low-carbon modifications of molybdenum high speed tool steels (Not
...
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