CarTech Custom 450 stainless is a martensitic age-hardenable stainless steel which exhibits very good corrosion resistance (similar to that of CarTech 304 stainless) with moderate strength (similar to that of Stainless Type 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. A particular advantage is ease of welding and brazing.

CarTech Custom 450 stainless is generally supplied in the annealed condition, requiring no heat treatment by the user for many applications. Because it has corrosion resistance like CarTech 304 stainless but three times the yield strength, it has been used in applications where CarTech 304 was not strong enough. On the other hand, it has also replaced Type 410 stainless directly on a strength basis where CarTech 410 had insufficient corrosion resistance. Mechanical properties will depend on the aging temperature selected.