The pickling solution in the pickling process is generally a mixture of various acids, mainly sulfuric acid, nitric acid, and hydrofluoric acid. , which puts forward high requirements on the corrosion resistance of anti-corrosion materials. The process of stainless steel pickling production line has a strong corrosion state from production to waste water and waste gas recovery system. Therefore, the selection of anti-corrosion materials is directly related to the equipment, workshop floor, trench, environmental protection recovery system of waste water and waste gas, etc. Normal use.