ASTM A 646/A646M : 2024
Current
The latest, up-to-date edition.
Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings
Hardcopy , PDF
English
01-05-2024
Important note : All end users must be registered with an Account prior to user licenses being assigned.| Committee |
A 01
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| DocumentType |
Standard
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| Pages |
5
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| PublisherName |
American Society for Testing and Materials
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| Status |
Current
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| Supersedes |
1.1This specification covers premium quality alloy steel semifinished rolled or forged blooms and billets for reforging into critical parts such as aircraft landing-gear forgings.
1.2Blooms and billets, hereinafter referred to as blooms, are semifinished steel products, hot rolled or forged to approximate cross-sectional dimensions. Blooms may be square, round, hexagonal, octagonal, or rectangular in section. For the purposes of this specification, minimum bloom section size will be 16 in.2 [103 cm2].
1.3This specification covers three basic classifications of steel:
1.3.1Class I—Vacuum-induction melted or consumable-electrode vacuum-melted, or other suitable processes which will satisfy the quality requirements of this specification.
1.3.2Class II—Air-melted vacuum-degassed.
1.3.3Class III—Air-melted electric furnace ladle refined and vacuum-degassed.
1.4The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard. Within the text and tables, the 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.
1.5Unless the order specifies the applicable “M” specification the material shall be furnished to the inch-pound units.
1.6This 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.
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