Type 309 is an austenitic chromium-nickel stainless steel (0.08% carbon maximum). Type 309 is used for parts requiring corrosion, heat and oxidation resistance up to 2000ºF. Strength at elevated temperatures is similar to 18-8 stainless steel. This alloy has excellent oxidation resistance, as well as high tensile and creep strength at elevated temperatures. It is more resistant to marine atmospheres than Type 304 and is generally considered a heat resistant alloy.