Type 420 stainless steel is a general purpose steel and possesses similar qualities to the 410 grade, but contains more carbon which provides improved hardness and strength when heat treated. 420 stainless has good mechanical and machining properties.
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.
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.
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.
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