904 l super austenitic stainless steel belongs to low carbon high nickel, molybdenum austenitic stainless acid-resistant steel, for the introduction of French h. S proprietary materials of the company. Has the very good activation - passivation shift ability, excellent corrosion resistance, in the oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid have good corrosion resistance, in neutral chlorine ion medium has the very good pitting resistance, at the same time has good resistance to crevice corrosion and stress corrosion resistance. Used in various concentration of sulfuric acid under 70 °C, under ordinary conditions of any concentration, temperature resistance of acetic acid and formic acid and acetic acid in mixed acid corrosion resistance is very good also.

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20 cr - ni 24-4.3 - Cu Mo - 1.5 (the content is provided by wuxi embellish ying steel co., LTD.)

Grades and standards: UNS N08904, DIN1.4539, ASTM A240 (new standard will be classified as stainless steel series, the original standard ASME SB - 625 to be classified as nickel base alloy series), SUS890L.