Stainless steel 347 (type 347 stainless steel) is a stabilized austenitic chromium-nickel stainless steel containing columbium. It has excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 800°F - 1500°F (427°C - 816°C). Its composition includes 17% chromium, 9% nickel, 2% molybdenum, and small amounts of nitrogen and columbium. In addition, it contains between 0.1 and 1.3 per cent titanium that stabilizes the material by forming extra stable carbonates on its grain boundaries when exposed to temperature ranges of 1650-1500 °F (899-816 °C).

Stainless Steel 347 is an austenitic chromium-nickel alloy combining columbium, tantalum, and molybdenum. It has excellent corrosion resistance and heat resistance up to 1500°F due to its high chromium content. Additionally, it maintains good formability even when exposed to high temperatures, making it ideal for use in environments such as automotive exhaust systems and dairy processing equipment or where weld decay may occur. Its many uses include the manufacture of pressure vessels, bolts, nuts and other fasteners frequently used in corrosive environments.