Stainless steel pump body casting refers to the manufacture of steel castings. Cast steel should be used when the strength of castings is high and cast iron cannot meet the requirements. However, the fluidity of molten steel is not as good as that of cast iron, so the thickness of the casting structure should not be too small and the shape should not be too complicated. The fluidity of molten steel can be improved when the silicon content is controlled at the upper limit. Cast steel can be divided into cast-steel for general engineering, cast-steel for welding structure, stainless steel and heat-resistant steel according to its varieties and USES.