ASTM A521-96

Standard Specification for Steel, Closed-Impression Die Forgings for General Industrial Use

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 to Definition A 509.
1.2 The classes of forgings are as follows, the choice depending on design and stress or service to be imposed:  
1.2.1 Class CA—Untreated, carbon steel forgings,  
1.2.2 Classes CC, CC1 and CE— Annealed, normalized and tempered, carbon steel forgings,  
1.2.3 Class CF—Normalized and tempered carbon steel forgings,  
1.2.4 Class CF1— Double normalized and tempered carbon steel forgings,  
1.2.5 Class CG—Quenched and tempered, or normalized, quenched and tempered carbon steel forgings,  
1.2.6 Class AA—Annealed, normalized, or normalized and tempered alloy steel forgings,  
1.2.7 Classes AB and AC—Normalized and tempered alloy steel forgings, and  
1.2.8 Classes AD, AE, AF, AG and AH—Normalized, quenched, and tempered alloy steel forgings.  
Note 2—The appendix tables list recommended tolerances for a number of materials other than those covered by the above classes. The tables are for information only and the purchaser must define the condition in which he desires forgings made from materials not described above.  
1.3 The values stated in inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 09-Sep-1996
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.06 - Steel Forgings and Billets

Relations

• Replaced By: ASTM A521-96(2001) - Standard Specification for Steel, Closed-Impression Die Forgings for General Industrial Use
• Effective Date: 10-Sep-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: A 521 – 96 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Steel, Closed-Impression Die Forgings for General Industrial
1
Use
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 A 370 Test Methods and Definitions for Mechanical Testing
3
of Steel Products
1.1 This specification covers untreated and heat-treated
4
A 509 Definition of Terms Relating to Steel Forging
steel, closed-impression die forgings (Note 1) for general
A 576 Specification for Steel Bars, Carbon, Hot-Wrought,
industrial use.
2
Special Quality
2
NOTE 1—For the definition of a forging, refer to Definition A 509.
A 711 Specification for Steel Forging Stock
E 10 Test Method for Brinell Hardness of Metallic Materi-
1.2 The classes of forgings are as follows, the choice
5
als
depending on design and stress or service to be imposed:
E 23 Test Method for Notched Bar Impact Testing of
1.2.1 Class CA—Untreated, carbon steel forgings,
5
Metallic Materials
1.2.2 Classes CC, CC1, and CE—Annealed, normalized
6
E 94 Guide for Radiographic Testing
and tempered, carbon steel forgings,
3. Terminology
1.2.3 Class CF—Normalized and tempered carbon steel
forgings,
3.1 Definitions of Terms Specific to This Standard:
1.2.4 Class CF1—Double normalized and tempered carbon 3.1.1 annealing—the forgings shall be reheated to a tem-
steel forgings,
perature which produces an austenitic structure and then cooled
slowly. A furnace charge thus treated is termed an annealing
1.2.5 Class CG—Quenched and tempered, or normalized,
quenched and tempered carbon steel forgings, charge.
3.1.2 cooling prior to heat treatment—after forging and
1.2.6 Class AA—Annealed, normalized, or normalized and
before reheating for heat treatment, the forgings shall be cooled
tempered alloy steel forgings,
to provide substantially complete transformation of austenite.
1.2.7 Classes AB and AC—Normalized and tempered alloy
3.1.3 normalizing—the forgings shall be reheated to a
steel forgings, and
temperature which produces an austenitic structure and then
1.2.8 Classes AD, AE, AF, AG, and AH—Normalized,
withdrawn from the furnace and cooled in air. A furnace charge
quenched, and tempered alloy steel forgings.
thus treated is termed a normalized charge.
NOTE 2—The appendix tables list recommended tolerances for a
3.1.4 quenching—the forgings shall be reheated to a tem-
number of materials other than those covered by the above classes. The
perature which produces an austenitic structure and then
tables are for information only and the purchaser must define the condition
quenched in a suitable liquid medium by spraying or immer-
in which he desires forgings made from materials not described above.
sion. A group thus treated is termed a quenching charge.
1.3 The values stated in inch-pound units are to be regarded 3.1.5 tempering—the forgings shall be reheated to and held
as the standard. at the proper temperature, which will be below the austenitic
transformation range, and then cooled under suitable condi-
2. Referenced Documents
tions. A furnace charge thus treated is termed a tempering
charge.
2.1 ASTM Standards:
A 29/A 29M Specification for Steel Bars, Carbon, Hot-
4. Ordering Information
2
Wrought, Special Quality
4.1 The purchaser shall specify in the inquiry, contract, and
2
A 322 Specification for Steel Bars, Alloy, Standard Grades
order the class of steel desired; and any exceptions, modifica-
tions, or agreements with regard to the provisions of this
specification.
1
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
3
A01.06 on Steel Forgings and Billets. Annual Book of ASTM Standards, Vol 01.03.
4
Current edition approved Sept. 10, 1996. Published July 1997. Originally Discontinued—see 1982 Annual Book of ASTM Standards, Vol 01.05.
e1 5
published as A 521 – 64. Last previous edition A 521 – 76 (1992) . Annual Book of ASTM Standards, Vol 03.01.
2 6
Annual Book of ASTM Standards, Vol 01.05. Annual Book of ASTM Standards, Vol 03.03.
1

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A 521
5. Process tensile properties prescribed in Table 1 when tested in accor-
dance with the latest issue of Test Methods and Definitions
5.1 The steel shall be made by any or all of the following
A 370.
processes: open-hearth, electric-furnace, or basic-oxygen.
...