CRUCIBLE 422 is a hardenable martensitic stainless steel which is being widely used for high temperatures up to 1200 °F. It has excellent creep-rupture properties in the range on 600/1200 °F and is capable of being treated to various high strength levels depending on section, form, and application involved. CRUCIBLE 422 offers designers in the aircraft and power industries high strength/weight ratios from room temperature to 1200°F. The composition is carefully balanced to provide a microstructure which is virtually all tempered martensite after heat treatment. This structure assures uniformity of mechanical properties with a minimum of directionality.