Form:

This specification covers an aircraft-quality, low-alloy steel in the form of bars, forgings, mechanical tubing, flash welded rings, and stock for forging or flash welded rings.

Application:

These products have been used typically for heat treated parts, which may be welded during fabrication, requiring through-hardening to high strength levels and which may be used at operational stress levels approaching the yield strength, but usage is not limited to such applications.