ASTM A579/A579M-04a
(Specification)Standard Specification for Superstrength Alloy Steel Forgings
Standard Specification for Superstrength Alloy Steel Forgings
ABSTRACT
This specification deals with the standard requirements for superstrength alloy steel forgings for highly stressed structural members. Covered here are eight types (twenty-seven grades) of alloy steels, namely: quenched and tempered steels (Grades 11, 12, 12a, 13, 21, 22, 23, 31, 32, and 33); air hardened steel (Grade 41); martensitic stainless steels (Grades 51, 52, and 53); No. 1 precipitation hardened stainless steel (Grade 61); No. 2 precipitation hardened stainless steel (Grade 64); No. 3 precipitation hardened stainless steels (Grades 62 and 63); maraging steels (Grades 71, 72, 73, 74, and 75); and miscellaneous steels (Grades 81, 82, 83, and 84). The steels shall be manufactured by melting process and shall be finished by hot-worked forging. Forgings may be furnished in one of the following conditions: stress relieving; annealing; solution treatment; solution treatment and ageing; normalizing; normalizing and tempering; or quenching and tempering. Heat and product analyses shall be employed to assess the conformance of steels with required chemical compositions. Forgings shall examined by tension and Charpy impact tests and conform to required mechanical properties such as yield strength, tensile strength, elongation, reduction of area, minimum room-temperature Charpy V-notch energy absorption, maximum annealed hardness, and section size capability. Nondestructive tests, such as magnetic particle, liquid penetrant, and ultrasonic inspection procedures, shall also be performed.
SCOPE
1.1 This specification covers requirements for forged steel shapes for highly stressed structural members requiring yield strengths in excess of 140 ksi [965 MPa].
1.2 This specification is not intended for applications limited by creep deformation.
1.3 Twenty-seven grades are covered by this specification. Selection will depend upon design, service conditions, and mechanical properties required.
1.4 Supplementary requirements are provided for use when additional testing or inspection is desired. These shall apply only when specified individually by the purchaser in the order.
1.5 The values stated in either inch-pound or SI (metric) units are to be regarded separately as standards. Within the text and tables, the SI units are shown in brackets. The values in each system are not exact equivalents; therefore, each system must be used independently of each other. Combining values from the two systems may result in non-conformance with the specification.
1.6 Unless the order specifies the applicable "M" specification designation, the material shall be furnished to the inch-pound units.
General Information
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Standards Content (Sample)
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Designation: A 579/A 579M – 04a
Standard Specification for
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Superstrength Alloy Steel Forgings
This standard is issued under the fixed designationA579/A579M; 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* E3 Methods of Preparation of Metallographic Specimens
E21 Test Methods for Elevated Temperature Tension Tests
1.1 This specification covers requirements for forged steel
of Metallic Materials
shapes for highly stressed structural members requiring yield
E45 Test Methods for Determining the Inclusion Content
strengths in excess of 140 ksi [965 MPa].
of Steel
1.2 This specification is not intended for applications lim-
E112 Test Methods for Determining Average Grain Size
ited by creep deformation.
E 165 Test Method for Liquid Penetrant Examination
1.3 Twenty-seven grades are covered by this specification.
Selection will depend upon design, service conditions, and
3. Ordering Information and General Requirements
mechanical properties required.
3.1 In addition to the ordering information required by
1.4 Supplementary requirements are provided for use when
Specification A 788, the purchaser shall include with the
additional testing or inspection is desired. These shall apply
inquiry and order a detailed drawing, sketch, or written
only when specified individually by the purchaser in the order.
description of the forging.
1.5 The values stated in either inch-pound or SI (metric)
3.2 Material supplied to this specification shall conform to
units are to be regarded separately as standards.Within the text
the requirements of Specification A 788, which outlines addi-
and tables, the SI units are shown in brackets. The values in
tional ordering information, manufacturing requirements, test-
each system are not exact equivalents; therefore, each system
ing and retesting methods and procedures, marking, certifica-
must be used independently of each other. Combining values
tion, product analysis variations, and additional supplementary
from the two systems may result in non-conformance with the
requirements.
specification.
3.3 If the requirements of this specification are in conflict
1.6 Unless the order specifies the applicable “M” specifica-
with the requirements of SpecificationA 788, the requirements
tion designation, the material shall be furnished to the inch-
of this specification shall prevail.
pound units.
4. Materials and Manufacture
2. Referenced Documents
2 4.1 The steel shall be made in accordance with the Melting
2.1 ASTM Standards:
Process Section of Specification A 788. A sufficient discard
A 255 Test Methods for Determining Hardenability of Steel
shall be made to secure freedom from injurious pipe and undue
A 275/A 275M Test Method for Magnetic Particle Exami-
segregation.
nation of Steel Forgings
4.2 The material shall be forged as close as practical to the
A 370 Test Methods and Definitions for MechanicalTesting
specified shape and size.
of Steel Products
4.3 The finished product shall be a hot-worked forging as
A 388/A 388M Practice for Ultrasonic Examination of
defined by Specification A 788.
Heavy Steel Forgings
4.4 Heat Treatment Performed by Forging Supplier—
A 788 Specification for Steel Forgings, General Require-
Forgings may be furnished in one of the following conditions
ments
as specified in the inquiry and purchase order (some conditions
are not applicable to all grades):
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
4.4.1 Stress relieved,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4.4.2 Annealed,
A01.06 on Steel Forgings and Billets.
4.4.3 Solution treated,
CurrenteditionapprovedSeptember1,2004.PublishedOctober2004.Originally
approved in 1967. Last previous edition approved in 2004 as A 579 – 04.
4.4.4 Solution treated and aged,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.4.5 Normalized,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.4.6 Normalized and tempered, or
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 4.4.7 Quenched and tempered.
*ASummary of Changes section appears at the end of this standard.
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A 579/A 579M – 04a
4.5 Heat Treatment Performed by Purchaser—When final 6. Mechanical Properties
heat treatment is to be performed by the purchaser after
6.1 The material shall conform to the mechanical properties
machining or fabrication
...
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