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.
303 Stainless machines well and cuts clean and maintains it resistance to corrosion in temperatures up to 1500 degrees F. Good applications include repeat machining, fittings and fasteners.
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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