17-4, also known as 630 stainless, can be heat treated to high levels of strength and hardness, and good for machining and is corrosion resistant. Often used in petroleum and chemical industries, as well as in aircraft parts.
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)
Grade 302 is a slightly higher carbon version than 304. 302 stainless steel is an extremely tough, ductile grade that demonstrates superior corrosion resistance. It is a non-magnetic grade that is not hardenable by heat treating. It is generally used in the annealed condition and is noted for its ease of fabrication and formability.
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