303 Free machining variation of T302/304 for use in automatic machining operations. Corrosion resistant to atmospheric exposures, sterilizing solutions, most organic and many inorganic chemicals, most dyes, nitric acid and foods.

304 The most widely used of the stainless and heat resisting steels. Offers good corrosion resistance to many chemical corrodents as well as industrial atmospheres. Has very good formability and can be readily welded by all common methods.

304L Extra low carbon variation of T304 avoids harmful carbide precipitation due to welding. Same corrosion resistance as T304. Slightly lower mechanical properties than T304.

316 Better corrosion and pitting resistance as well as higher strength at elevated temperatures than T304. Used for pumps, valves, textile and chemical equipment, pulp & paper and marine applications.

316L Extra low carbon variation of T316 to avoid carbide precipitation due to welding. Same excellent corrosion resistance of T316.

416 Free-machining variation of T410 with useful corrosion resistance to natural food acids, basic salts, water ad most atmospheres.

440 C A high carbon (.95/1.20%C chromium steel that can attain the highest hardness (Rockwell C60) of any standard stainless grade. In the hardened and stress relieved condition, 440 C has maximum hardness together with high strength and corrosion resistance. Also has good abrasion resistance. 440 A is lower carbon variety (.60/.75%C) which results in lower hardness but greater toughness in the hardened condition.

17-4/TYPE 630 A precipitation hardening grade combining high strength and hardness with corrosion resistance similar to T304 in most media. Simple low temperature heat treatment eliminates scaling and prevents excessive warpage.