Form This specification covers a premium aircraft-quality@ maraging steel in the form of bars@ forgings@ mechanical tubing@ flash welded rings up to 10.0 inches (254 mm) in diameter or least distance between parallel sides@ and stock of any size for forging or flash welded rings (see 8.6). Application These products have been used typically for parts@ such as pressure vessels@ requiring through hardening@ without quenching@ to a minimum yield strength of 240 ksi (1655 MPa) and where such parts may require welding during fabrication@ but usage is not limited to such applications.