904L Super Austenitic stainless steel is a highly alloyed austenitic stainless steel with very low carbon content and excellent corrosion resistance in dilute sulfuric acid, designed for harsh corrosion conditions. Has high chromium content and plenty of nickel content, the addition of copper makes it have strong ability to resist acid, especially for chloride clearance corrosion and stress corrosion cracking are highly resistant, not easy appeared pitting spots and cracks, pitting resistance slightly better with other steel grade, good machinability and weldability, can be used for pressure vessels.