Form This specification covers a corrosion and heat-resistant steel in the form of work-strengthened bars and wire@ 1-1/4 inches (31.8 mm) and under in nominal diameter or least distance between parallel sides (see 8.6). Application These products have been used typically for parts@ such as fasteners@ requiring room-temperature minimum tensile strength of 160 ksi (1103 MPa) after precipitation heat treatment@ for use up to 1000 ??(538 ?? and having oxidation resistance up to 1200 ??(649 ??@ but usage is not limited to such applications.