Stainless 309 is an austenitic chromium nickel stainless steel and offers a better corrosion resistance than the type 304 because of higher percentages of nickel and chromium. Suitable for parts requiring both corrosion and heat resistance and oxidation resistance up to 2000 °F. Strength at elevated temperatures is similar to that of 18-8 Stainless Steels. This alloy posses excellent resistance to oxidation as well as high tensile and creep strengths at elevated temperatures. It is generally considered as a heat-resisting alloy.
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)
Stainless 304, also known as 18-8 stainless, is the most common steel used in a variety of uses because of the ease in which it can be formed into various shapes. Non-magnetic and highly resistant to corrosion makes it a good all-purpose stainless.
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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