1. Scope

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 cm ² ].

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 shall be used independently 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A255 Test Methods for Determining Hardenability of Steel

A388/A388M Practice for Ultrasonic Examination of Steel Forgings

A604 Test Method for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets

A788/A788M Specification for Steel Forgings, General Requirements

E45 Test Methods for Determining the Inclusion Content of Steel

E114 Practice for Ultrasonic Pulse-Echo Straight-Beam Contact Testing

E127 Practice for Fabricating and Checking Aluminum Alloy Ultrasonic Standard Reference Blocks

E214 Practice for Immersed Ultrasonic Testing by the Reflection Method Using Pulsed Longitudinal Waves

E381 Method of Macroetch Testing Steel Bars, Billets, Blooms, and Forgings

AMS Standards

Keywords

aerospace application; alloy steels; consumable electrode remelted; electric furnace; ladle refined; premium quality; reforging stock; steel billets; steel blooms; vacuum degassed; vacuum melted; Aerospace applications--specifications; Aircraft materials/applications--specifications; Alloy steel blooms/billets--specifications; Alloy steel forgings--specifications; Steel billets and blooms--specifications;

ICS Code

ICS Number Code 49.025.10 (Steels)

DOI: 10.1520/A0646_A0646M-06

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