ASTM A668/A668M-02

Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use

SCOPE
1.1 This specification covers untreated and heat-treated carbon and alloy steel forgings for general industrial use. Other ASTM specifications for forgings are available for specific applications such as pressure vessels, railroad use, turbine generators, gearing, and others involving special temperature requirements.  
1.2 Hot-rolled or cold finished bars are not within the scope of this specification.  
1.3 Six classes of carbon steel and seven classes of alloy steel forgings are listed (see Section 7) , which indicates their required heat treatments, as well as mechanical properties.  
1.4 Supplementary requirements of an optional nature are provided. These shall apply only when specified by the purchaser.  
1.5 Appendix X1 lists the grades corresponding to the various grades of Specifications A235, A237, and A243 which have been superseded by this specification.  
1.6 The values stated in either inch-pound units or SI units are to be regarded separately as the standard; within the text and tables, the SI units are shown in brackets. The values stated in each system are not exactly equivalent; therefore; each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 09-Jul-2002
• ICS: 77.140.85 - Iron and steel forgings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaces: ASTM A668/A668M-96(2001) - Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use
• Effective Date: 10-Jul-2002
• Replaced By: ASTM A668/A668M-03 - Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use
• Effective Date: 10-Jul-2002
• Referred By: ASTM F1073-19 - Standard Specification for Door Fittings, for Watertight /Gastight /Airtight, Weathertight, and Non-Tight Doors, for Marine Use
• Effective Date: 10-Jul-2002
• Referred By: ASTM F993-21 - Standard Specification for Valve Locking Devices
• Effective Date: 10-Jul-2002
• Referred By: ASTM A36/A36M-19 - Standard Specification for Carbon Structural Steel
• Effective Date: 10-Jul-2002
• Referred By: ASTM A788/A788M-23 - Standard Specification for Steel Forgings, General Requirements
• Effective Date: 10-Jul-2002
• Referred By: ASTM A456/A456M-08(2023) - Standard Specification for Magnetic Particle Examination of Large Crankshaft<brk/> Forgings
• Effective Date: 10-Jul-2002

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
American Association State
Designation: A 668/A 668M – 02
Highway and Transportation Officials Standard
AASHTO No.: M 102
Standard Specification for
Steel Forgings, Carbon and Alloy, for General Industrial
1
Use
This standard is issued under the fixed designation A 668/A 668M; 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. Scope* A 654 Specification for Special Requirements for Steel
Forgings and Bars for Nuclear and Other Special Appli-
1.1 This specification covers untreated and heat-treated
4
cations
carbon and alloy steel forgings for general industrial use. Other
A 788 Specification for Steel Forgings, General Require-
ASTM specifications for forgings are available for specific
2
ments
applications such as pressure vessels, railroad use, turbine
E 381 Method of Macroetch Testing Steel Bars, Billets,
generators, gearing, and others involving special temperature
5
Blooms, and Forgings
requirements.
1.2 Hot-rolled or cold finished bars are not within the scope
3. Terminology
of this specification.
3.1 Definitions of Terms Specific to This Standard:
1.3 Six classes of carbon steel and seven classes of alloy
3.1.1 hollow cylindrical forging—a forging whose length,
steel forgings are listed (see Section 7) , which indicates their
as measured on its longitudinal axis is more than its diameter,
required heat treatments, as well as mechanical properties.
shall be considered as a hollow cylinder within the scope of
1.4 Supplementary requirements of an optional nature are
this specification if it has been lengthened by extrusion or
provided. These shall apply only when specified by the
forged in a manner similar to that of a ring, namely, expanded
purchaser.
in diameter on a mandrel.
1.5 Appendix X1 lists the grades corresponding to the
3.1.2 ring-shaped or disk-shaped forging—a forging whose
various grades of Specifications A 235, A 237, and A 243,
length, as measured on its longitudinal axis, is less than its
which have been superseded by this specification.
diameter or main transverse dimension is considered a ring or
1.6 The values stated in either inch-pound units or SI units
disk within the meaning of this specification.
are to be regarded separately as the standard; within the text
and tables, the SI units are shown in brackets. The values stated
4. Ordering Information
in each system are not exactly equivalent; therefore; each
4.1 When this specification is to be applied to an inquiry,
system must be used independently of the other. Combining
contract, or order, the purchaser should furnish the following
values from the two systems may result in nonconformance
information:
with the specification.
4.1.1 The ordering information required by Specification A
2. Referenced Documents 788.
4.1.2 The class of forging desired as listed in Section 7,
2.1 ASTM Standards:
4.1.3 The options which may be selected as found in 5.4.2,
A 275/A 275M Test Method for Magnetic Particle Exami-
2 7.1.2, 7.3, and 14.1, and
nation of Steel Forgings
4.1.4 Applicable supplementary requirements.
A 370 Test Methods and Definitions for Mechanical Testing
3
of Steel Products
5. Materials and Manufacture
A 388/A 388M Practice for Ultrasonic Examination of
2 5.1 Melting Process—The steel shall be made by the
Heavy Steel Forgings
open-hearth, basic-oxygen, or electric-furnace process.
5.2 Discard—Sufficient discard shall be made from each
ingot to secure freedom from piping and undue segregation.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
5.3 Forging Process
Stainless Steel, and Related Alloys, and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
Current edition approved July 10, 2002. Published July 2002. Originally
published as A 668 – 72. Last previous edition A 668 – 96 (2001).
2 4
Annual Book of ASTM Standards, Vol 01.05. Discontinued. See 1983 Annual Book of ASTM Standards, Vol 01.05.
3 5
Annual Book of ASTM Standards, Vol 01.03. Annual Book of ASTM Standards, Vol 03.01.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 668/A 668M – 02
5.3.1 The forging shall be brought as close as practical to 7.1.3 Size Classification—The dimen
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