The 347 stainless steel grade is a stabilized alloy, due to its columbium + tantalum component within. Ideal for long-term work life in high temperatures (800-1500ºF), 347 Stainless Steel is also resistant to intergranular corrosion in the chromium carbide precipitation range.

Alloy 347 is a balanced, austenitic, chromium steel containing columbium which takes into consideration the end of carbide precipitation, and thus intergranular corrosion. Alloy 347 is balanced out by the increases of chromium and tantalum and offers higher creep and stress rupture properties than alloy 304 and 304L, which may also be utilized for exposures where sensitization and intergranular corrosion are of concern.The expansion of columbium likewise permits Alloy 347 to have outstanding corrosion resistance, better than that of alloy 321. Alloy 347H is the higher carbon composition form of Alloy 347and display enhanced high temperature and creep properties.