330 is an austenitic nickel-iron-chromium alloy metled as AOD melt type. This grade is comprised of approximately 36% nickel giving it excellent high temperature oxidation resistance up to 2200oF. 330 stainless remains fully austenitic at all temperatures and is not subject to embrittlement from sigma formation. It has a solid solution composition and is not hardenable by heat treatment.
Type 403 stainless is a corrosion and heat resistant 12% Cr martensitic alloy, very similar to stainless type 410, with the exception of a slightly lower maximum silicon content and a slightly lower maximum chromium content. Good levels of strength, toughness and ductility may be obtained with this alloy.
Stainless 422 is a hardenable, martensitic stainless steel with better strength at higher temperatures as high as 1200 F. It is capable of being heat treated to various high strength levels.
Of the 400 series of stainless steels, 400C has the highest carbon content and moderate corrosion resistance and can heat-treat to the highest harness of RC 60. (In contrast, 416 is normally heat treated to RC 26/32)
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