904L super austenitic stainless steel is a low-carbon high-nickel, molybdenum austenitic stainless acid-proof steel, with a very good activation – passivation conversion capability, excellent corrosion resistance, in non-oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid has good corrosion resistance in neutral chloride ion has a good medium resistance to pitting corrosion, but also has good resistance to crevice corrosion and stress corrosion resistance. For various concentrations of sulfuric acid below 70 ℃, any resistance at atmospheric pressure and the concentration of acetic acid and formic acid at any temperature mixed with acetic acid corrosion resistance is also very good.