Custom 450® is a martensitic age-hardenable stainless steel which exhibits very good corrosion resistance (similar to 304) with moderate strength (similar to 410). The alloy has a yield strength somewhat greater than 100 ksi (689 MPa) in the annealed condition but is easily fabricated. A single-step aging treatment develops higher strength with good ductility and toughness. This stainless can be machined, hot-worked, and cold-formed in the same manner as other martensitic age-hardenable stainless steels with mechanical properties that will depend on the aging temperature selected. A particular advantage is ease of welding and brazing.