CarTech 355 alloy is a chromium-nickel-molybdenum stainless steel which can be hardened by martensitic transformation and/or precipitation hardening.

Depending upon the heat treatment, CarTech 355 alloy may have an austenitic structure and formability similar to other austenitic stainless steels or a martensitic structure and high strength comparable to other martensitic stainless steels. High strengths may also be attained by cold working, and are maintained (whether produced by heat treatment or by cold work) at temperatures up to 1000°F (538°C). Corrosion resistance of the alloy is superior to that of other quench-hardenable martensitic stainless steels and approaches that of the chromium-nickel austenitic stainless steels.

The alloy is usually supplied in either the annealed or in the equalized and over-tempered condition.

Applications:
It has been used for gas turbine compressor components such as blades, discs, rotors and shafts and similar parts where high strength is required at intermediate elevated temperatures.