Designation: A 521 – 03
Standard Specification for
Steel, Closed-Impression Die Forgings for General Industrial
Use
1
This standard is issued under the fixed designation A 521; 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.
1. Scope*
1.1 This specification covers untreated and heat-treated
steel, closed-impression die forgings (Note 1) for general
industrial use.
NOTE 1—For the definition of a forging, refer General Requirements
Specification A 788.
1.2 The Grades of forgings are as follows, the choice
depending on design and stress or service to be imposed:
1.2.1 Grade CA—Untreated, carbon steel forgings,
1.2.2 Grades CC, CC1, and CE—Annealed, normalized and
tempered, carbon steel forgings,
1.2.3 Grade CF—Normalized and tempered carbon steel
forgings,
1.2.4 Grade CF1—Double normalized and tempered car-
bon steel forgings,
1.2.5 Grade CG—Quenched and tempered, or normalized,
quenched and tempered carbon steel forgings,
1.2.6 Grade AA—Annealed, normalized, or normalized and
tempered alloy steel forgings,
1.2.7 Grades AB and AC—Normalized and tempered alloy
steel forgings, and
1.2.8 Grades AD, AE, AF, AG, and AH—Normalized,
quenched, and tempered alloy steel forgings.
1.3 The values stated in inch-pound units are to be regarded
as the standard.
2. Referenced Documents
2.1 ASTM Standards:
2
A 29/A 29M Specification for Steel Bars, Carbon and
Alloy, Hot-Wrought and Cold-Finished, General Require-
ments for
A 275/A 275M Test Method for Magnetic Particle Exami-
nation of Steel Forgings
A 322 Specification for Steel Bars, Alloy, Standard Grades
A 388/A 388M Practice for Ultrasonic Examination of
Heavy Steel Forgings
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 576 Specification for Steel Bars, Carbon, Hot-Wrought,
Special Quality
A 711 Specification for Steel Forging Stock
A 788 Specification for Steel Forgings General Require-
ments
A 921/A 921M Steel Bars, Microalloy, Hot-Wrought, Spe-
cial Quality for Subsequent Hot Forging
E 3 Guide for Preparation of Metallographic Specimens
E 45 Practice for Determining the Inclusion Content of
Steel
E 94 Guide for Radiographic Examination
E 112 Test Methods for Detemining the Average Grain Size
E 340 Macro Etching Metals and Alloys
E 381 Method of Macroetch Testing, Inspection and Rating
Steel Products, Comprising Bars, Billets, Blooms, and
Forgings
E 407 Practice for Microetching of Metals and Alloys
3. Ordering Information and General Requirements
3.1 Material supplied to this specification shall conform to
the requirements of Specification A 788, which outlines addi-
tional ordering information, manufacturing requirements, test-
ing and retesting methods and procedures,product analysis
variations, marking, certification and additional supplementary
requirements. Failure to comply with the requirements of
Specification A 788 constitutes non-conformance with this
specification
3.2 In addition to the ordering information required by
Specification A 788, the purchaser may require that the
tolerances stated in the appendices to this specification shall
apply.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.06 on Steel Forgings and Billets.
Current edition approved Sept. 10, 2003. Published December 2003. Originally
approved in 1964. Last previous edition approved in 2001 as A 521–96 (2001).
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
1
*A Summary of Changes section appears at the end of this standard.
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