Form: This specification covers a premium-aircraft-quality@ maraging steel in the form of bars@ forgings@ mechanical tubing@ flash welded rings@ and stock for forging or flash welded rings. Application: Primarily for parts@ such as pressure vessels and other components@ requiring through hardening@ without quenching@ to a yield strength of 270@000 psi (1860 MPa) and higher and where such parts may require welding during fabrication.