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ASTM A638/A638M-23

Current Revision

Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature Service

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1.1 This specification2 covers hot-finished or cold-finished precipitation hardening iron base superalloy bars, forgings, and forging stock for high-temperature service. The mechanical properties of these alloys are developed by suitable solution treating and precipitation hardening treatments.

1.2 Two grades of iron base alloy are covered. Selection will depend upon design, service conditions, mechanical properties, and elevated temperature characteristics.

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. SI units are shown in brackets. 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.

1.4 Unless the order specifies an “M” designation, the material shall be furnished to inch-pound units.

1.5 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.


This specification covers hot-finished or cold-finished precipitation hardening iron base superalloy bars, forgings, and forging stock for high-temperature service. The mechanical properties of these alloys are developed by suitable solution treating and precipitation hardening treatments. Two grades of iron base alloy are covered; Grade 660 and Grade 662 (bars and forgings). The material shall meet the requirements as to stress rupture properties specified. The material shall conform to the chemical, mechanical, and metallurgical properties requirements specified.


SDO ASTM: ASTM International
Document Number A638
Publication Date May 1, 2023
Language en - English
Page Count 3
Revision Level 23
Supercedes
Committee A01.17
Publish Date Document Id Type View
May 1, 2023 A0638_A0638M-23 Revision
March 1, 2020 A0638_A0638M-20 Revision
April 1, 2010 A0638_A0638M-10 Revision
March 10, 2000 A0638_A0638M-00 Revision
June 1, 2018 A0638_A0638M-10R18E01 Reaffirmation
Sept. 1, 2004 A0638_A0638M-00R04 Reaffirmation