904L Bright Annealed Stainless Steel Pipe Tube ASTM 100mm For Chemical Industry

Because the carbon content of 904L is very low (maximum 0.020%), there will be no carbide precipitation under general heat treatment and welding conditions. This eliminates the risk of intergranular corrosion after general heat treatment and welding. Due to the high content of chromium, nickel and molybdenum and the addition of copper, 904L stainless steel tubes can be passivated even in reducing environments, such as sulfuric acid and formic acid. The high nickel content makes it have a lower corrosion rate in the active state. In the concentration range of 0~98% pure sulfuric acid, the service temperature of 904L can be as high as 40 ℃. 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, 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 strong oxidizing nitric acid, the corrosion resistance is lower than that of high alloyed steel without molybdenum. In hydrochloric acid, the use of 904L stainless steel pipe is limited to 1-2% of lower concentration. In this concentration range. The corrosion resistance of 904L stainless steel pipe is better than that of conventional stainless steel. 904L stainless steel pipe has high resistance to spot corrosion. In chloride solution, its crack corrosion resistance is also very good.