904L is a low carbon high alloyed austenitic stainless steel. Conditions for the corrosion of the steel is designed for harsh environments. Initially the steel for corrosion resistance in sulfuric acid in the development. This feature after many years of practical application has been verified is very successful. Now, 904L in many countries has been standardized. Due to higher chromium, nickel, molybdenum and copper content, 904L for corrosion, especially in dilute sulfuric acid in, with excellent corrosion resistance. Other features include: - good resistance to pitting and crevice corrosion of capacity - high capacity of resistance to stress corrosion cracking - good resistance to intergranular corrosion ability - good machinability and weldability