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Introduction To 904l Stainless Steel
Mar 05, 2018

The 904L super austenitic stainless steel is a low carbon, high nickel, molybdenum austenitic stainless steel, which is a proprietary material for the introduction of French H • S. Has the very good activation and 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 ℃, 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.

Since the carbon content of 904L is very low (maximum 0.020%), there will be no carbon precipitation in the case of general heat treatment and welding. This eliminates the risk of intergranular corrosion after normal heat treatment and welding. Because of the high chromium nickel content and the addition of copper, 904L can be passivated even in reduced conditions such as sulfuric acid and formic acid. High nickel content also has low corrosion velocity in active state. In pure sulfuric acid at a concentration of 0~98%, the temperature of 904L can reach up to 40c. The corrosion resistance of pure phosphoric acid in the concentration range of 0~85% is very good. In industrial phosphoric acid produced by wet process, impurity has a strong influence on corrosion resistance. Of all kinds of phosphoric acid, 904L is better than ordinary stainless steel. In the highly oxidized nitric acid, 904L has low corrosion resistance compared with the high alloying steel without molybdenum. In hydrochloric acid, the use of 904L is limited to a low concentration of 1-2%. In this concentration range. The corrosion resistance of 904L is better than that of conventional stainless steel. 904L steel has high corrosion resistance. Its anti - crevice corrosion resistance is also very good in chloride solution. The high nickel content of 904L reduces the corrosion rate at the pits and crevices. Ordinary austenitic stainless steel when temperature is higher than 60 degrees Celsius, in a rich chloride environment sensitive to stress corrosion may be, by improving the nickel content of stainless steel, can reduce the sensitization. Due to high nickel content, 904L is highly resistant to stress corrosion cracking in the environment of chloride solution, concentrated hydroxide solution and hydrogen sulfide.