904L Stainless Steel Round Tube

904L stainless steel pipe is an austenitic stainless steel with better corrosion resistance. Because of the addition of 1.5% copper, it also has excellent corrosion resistance against reducing acids such as sulfuric acid and phosphoric acid.

904L alloy is an austenitic stainless steel with high alloy content and low carbon content. The structure is completely austenitic and is not easily affected by moisture ferrite and sigma phase. It has strong corrosion protection capabilities, especially in sulfuric and phosphoric acid environments, due to its high content of chromium, nickel, molybdenum and copper. Since the carbon content of 904L is very low (maximum 0.020%), there will be no carbide precipitation under normal heat treatment and welding. This eliminates the risk of intergranular corrosion that normally occurs after heat treatment and welding.

Due to the high chromium-nickel-molybdenum content and the addition of copper, 904L stainless steel pipes can be passivated even in reducing environments such as sulfuric acid and formic acid. The high nickel content also results in a lower corrosion rate in the active state. In pure sulfuric acid in the concentration range of 0~98%, the service temperature of 904L can be as high as 40°C. In pure phosphoric acid with a concentration range of 0~85%, its corrosion resistance is very good.

In industrial phosphoric acid produced by wet processes, impurities have a strong impact on corrosion resistance. Among all kinds of phosphoric acid, 904L stainless steel pipe has better corrosion resistance than ordinary stainless steel pipe. In highly oxidizing nitric acid, the corrosion resistance is lower compared to highly alloyed steels that do not contain molybdenum. In hydrochloric acid, the use of 904L stainless steel pipe is limited to lower concentrations of 1-2%. within this concentration range. The corrosion resistance of 904L stainless steel pipe is better than that of conventional stainless steel.

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