ASTM A668/A668M-04

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American Association State
Designation: A668/A668M – 04 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 designationA668/A668M; 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 (´) 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* A275/A275M Practice for Magnetic Particle Examination
of Steel Forgings
1.1 This specification covers untreated and heat-treated
A370 Test Methods and Definitions for Mechanical Testing
carbon and alloy steel forgings for general industrial use. Other
of Steel Products
ASTM specifications for forgings are available for specific
A388/A388M Practice for Ultrasonic Examination of Steel
applications such as pressure vessels, railroad use, turbine
Forgings
generators, gearing, and others involving special temperature
A788/A788M Specification for Steel Forgings, General Re-
requirements.
quirements
1.2 Hot-rolled or cold finished bars are not within the scope
E381 Method of Macroetch Testing Steel Bars, Billets,
of this specification.
Blooms, and Forgings
1.3 Six classes of carbon steel and seven classes of alloy
steel forgings are listed (see Section 7) , which indicates their
3. Terminology
required heat treatments, as well as mechanical properties.
3.1 The terminology section of Specification A788/A788M
1.4 Provision, with the suffix H for certification and mark-
is applicable to this specification.
ing, for the supply of forgings after hardness testing only.
3.2 Definitions of Terms Specific to This Standard:
1.5 Supplementary requirements, including those in Speci-
3.2.1 hollow cylindrical forging—a forging whose length,
fication A788/A788M, of an optional nature are provided.
as measured on its longitudinal axis is more than its diameter,
These shall apply only when specified by the purchaser.
shall be considered as a hollow cylinder within the scope of
1.6 Appendix X1 lists the current classes corresponding to
this specification if it has been lengthened by extrusion or
the various classes of Specifications A235, A237, and A243,
forged in a manner similar to that of a ring, namely, expanded
which have been superseded by this specification.
in diameter on a mandrel.
1.7 The values stated in either inch-pound units or SI units
3.2.2 ring-shaped or disk-shaped forging—a forging whose
are to be regarded separately as the standard; within the text
length, as measured on its longitudinal axis, is less than its
andtables,theSIunitsareshowninbrackets.Thevaluesstated
diameter or main transverse dimension is considered a ring or
in each system are not exactly equivalent; therefore; each
disk within the meaning of this specification.
system must be used independently of the other. Combining
values from the two systems may result in nonconformance
4. Ordering Information and General Requirements
with the specification.
4.1 Material supplied to this specification shall conform to
1.8 Unless the order specifies the applicable 9M9 specifica-
the requirements of SpecificationA788/A788M which outlines
tion, the forgings shall be furnished to the inch-pound units
additional ordering information, manufacturing requirements,
testing and retesting methods and procedures, marking, certi-
2. Referenced Documents
2
fication, product analysis variations and additional supplemen-
2.1 ASTM Standards:
tary requirements.
4.1.1 If the requirements of this specification are in conflict
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
with the requirements of Specification A788/A788M, the
Stainless Steel, and RelatedAlloys, and is the direct responsibility of Subcommittee
requirements of this specification shall prevail.
A01.06 on Steel Forgings and Billets.
4.2 When this specification is to be applied to an inquiry,
Current edition approved March 1, 2004. Published April 2004. Originally
approved in 1972. Last previous edition approved in 2003 as A668 – 03. DOI:
contract, or order, the purchaser should furnish the following
10.1520/A0668_A0668M-04.
information:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.2.1 The ordering information required by Specification
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
A788/A788M.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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