Stainless Steel 347 is an austenitic stainless steel that has been stabilized with columbium (niobium) to enhance its corrosion resistance to intergranular corrosion. It is an extremely good choice where high-temperature and corrosion conditions prevail. SS 347 possesses better oxidation and creep strength than other grades of stainless steel and finds best application in petrochemica... https://www.globalsteelindustries.com/stainless-steel-347-flanges-manufacturers-suppliers-stockists-exporters.html