Form

This specification covers a premium aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, and forging stock.

Application

These products have been used typically for carburized parts requiring high minimum core hardness with a narrow range and subject to stringent magnetic particle inspection standards, but usage is not limited to such applications.

Classification

Steel covered by this specification is classified by melting practice as follows:

Type 1 Electroslag remelted (ESR)

Type 2 Consumable electrode vacuum remelted (VAR)

Unless a specific type is ordered, either type may be supplied.