Therefore, stainless steel pumps generally have excellent corrosion resistance and high temperature resistance. Ferritic stainless steel and austenitic stainless steel with chromium content not less than 14% have excellent nitric acid corrosion resistance. Stainless steel corrosion-resistant pump sucks and discharges liquid through the movement of working parts, which makes the working volume increase and decrease periodically, and directly increases the pressure of liquid through the extrusion of working parts.