Stainless steel submersible pump material determines the price

Now on the market according to material points: 201 stainless steel submersible pump, 304 stainless steel submersible pump, 316 stainless steel submersible pumps, stainless steel pumps have a different material for each application environment and differential performance.
201 stainless steel submersible pump corrosion is as usual, but better than the cast iron corrosion resistance is a high level of cast iron pumps, tension for environmental requirements is not high. 304 material stainless steel submersible pump performance is relatively high, can comply with the huge corrosive environment, relative to the 201 stainless steel material in terms of quality and durability, is the best choice for many users (many factories or sewage treatment or Water purification treatment or water supply system of choice for urban water supply). The 316 stainless steel material can be resistant to strong acid and alkali, transport medium PH value of 2-13, the usual chemical plant or electroplating factory and so choose this material pump.
Different stainless steel pump with different performance characteristics, but also determines the price on the market, 316 stainless steel submersible pump with your 304, 304 and expensive in 201