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ASTM A646/A646M-04

Historical Revision

Standard Specification for Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings

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1.1 This specification covers premium quality alloy steel semifinished rolled or forged blooms and billets for reforging into critical parts such as aircraft landing-gear forgings.

1.2 Blooms 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).

1.3 This specification covers two basic classifications of steel:

1.3.1 Class I—Vacuum-induction melted or consumable-electrode vacuum melted, or other suitable processes which will satisfy the quality requirements of this specification.

1.3.2 Class II—Air-melted vacuum degassed.

1.3.3 Class III—Air melted electric furnace ladle refined and vacuum degassed

1.4 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 stated in each system are not exact equivalents; therefore, each system must be used independent of the other. Combining values from the two systems may result in nonconformance with the specification.

1.5 Unless the order specifies the applicable "M" specification the material shall be furnished to the inch-pound units.


SDO ASTM: ASTM International
Document Number A646
Publication Date Sept. 1, 2004
Language en - English
Page Count 5
Revision Level 04
Supercedes
Committee A01.06
Publish Date Document Id Type View
May 1, 2024 A0646_A0646M-24 Revision
Nov. 15, 2017 A0646_A0646M-17 Revision
Dec. 1, 2006 A0646_A0646M-06 Revision
Sept. 1, 2004 A0646_A0646M-04 Revision
March 1, 2022 A0646_A0646M-17R22 Reaffirmation
March 1, 2016 A0646_A0646M-06R16 Reaffirmation
April 1, 2011 A0646_A0646M-06R11 Reaffirmation