Form

This specification covers a premium aircraft-quality corrosion-resistant steel in the form of bars, wire, forgings, mechanical tubing, flash welded rings, extrusions, and stock for forging, flash welded rings, or extruding.

Application

These products are used typically for parts, such as compressor wheels and structural members, requiring high strength and oxidation resistance up to 800 °F (427 °C), but usage is not limited to such applications.

Classification

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

Type 1 - Multiple melted using consumable electrode vacuum arc (VAR) practice in the remelt cycle.

Type 2 - Multiple melted using electroslag (ESR) process in the final melting cycle.

Type 1 shall be supplied unless Type 2 is permitted or required by purchaser.