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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.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
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-eight 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 SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A255 Test Methods for Determining Hardenability of Steel
A275/A275M Practice for Magnetic Particle Examination of Steel Forgings
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A388/A388M Practice for Ultrasonic Examination of Steel Forgings
A788/A788M Specification for Steel Forgings, General Requirements
E3 Guide for Preparation of Metallographic Specimens
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E45 Test Methods for Determining the Inclusion Content of Steel
E112 Test Methods for Determining Average Grain Size
E165/E165M Practice for Liquid Penetrant Testing for General Industry
ICS Number Code 77.140.85 (Iron and steel forgings)
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ASTM A579 / A579M-20, Standard Specification for Superstrength Alloy Steel Forgings, ASTM International, West Conshohocken, PA, 2020, www.astm.orgBack to Top