Stainless Steel Alloy 347 Composition

C 0.08%, Mn 2%, Si 0.75%, S 0.03%, P 0.045%, Cr 17 - 19%, Ni 9 - 13%, (Cb + Ta) 10xC min to 1% Max, , Fe Balance

Stainless Steel Alloy 347 Description

Alloy 347 is a stabilized stainless steel alloy which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperatures in the chromium carbide precipitation range from 800 - 1600°F

Stainless Steel Alloy 321 Applications

Oil Refineries

Fluid catalytic cracking units (FCC)

Hanger rods

Recuperator tube sheets, shell, supports

Especially where temperatures exceed 550°F and resistance to sulfidation is needed

Fired heater tubes

Distributor trays and thermowells

Equipment in and around reactors (good resistance to polythionic acid)