Since the 904L carbon content is very low (up to 0.020%), there is no carbide separation in the case of normal heat treatment and welding. This eliminates the risk of intergranular corrosion that occurs after heat treatment and welding. Because of the high chromium nickel molybdenum content and the addition of copper, the 904L stainless steel plate can be passivated even in a reducing environment such as acid and formic acid.
High nickel content in the active state also has a lower corrosion rate. In the concentration range of 0 ~ 98% pure acid, 904L of the application temperature can be as high as 40 degrees Celsius. In the range of 0 ~ 85% concentration of pure phosphoric acid, its corrosion resistance is very good.
In the industrial process of phosphoric acid produced by wet technology, the impurity has a strong influence on the opposite corrosion function. In all the various phosphoric acid, 904L stainless steel plate corrosion resistance is superior to the general stainless steel. In strong oxidizing acids, 904L has a lower corrosion resistance compared to highly alloyed steels free of molybdenum.
In hydrochloric acid, the use of 904L is limited to a lower concentration of 1-2%. In this concentration range. 904L corrosion resistance is better than conventional stainless steel. 904L steel has a high resistance to corrosion. It is also excellent in crevice corrosion in chloride solutions.
904L stainless steel plate high nickel content, reducing the corrosion rate in the pit and the gap. Ordinary austenitic stainless steels may be sensitive to stress corrosion in a chloride-rich environment at temperatures above 60 ° C, which can be reduced by increasing the nickel content of stainless steels. Because of the high nickel content, 904L has a high resistance to stress corrosion cracking in chloride solutions, concentrated hydroxide solutions and hydrogen sulfide-rich environments.
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