What material should be used to pump seawater, 316 stainless steel, duplex stainless steel or titanium?

Q: What material should be used to pump seawater, 316 stainless steel, duplex stainless steel or titanium?

A: This is a problem of pump selection for many pump companies (including, of course, Aitke pump industry). According to the experience of visiting the site after pump selection for customers, it is summarized as follows:

1. Austenitic stainless steel stainless steel pump has very poor chloride ion corrosion resistance, and dual-phase stainless steel corrosion resistant pump has much better seawater corrosion resistance at room temperature than austenitic stainless steel

2. For the order bits from high to low pitting equivalent: 2507 2205 2304 317L 304L;

3. Below 20℃, even the proportion of pitting in 304L is small, but it rises sharply above 20℃; The corrosion of 2205 steel only occurs when it reaches 80 degrees and 2%Cl ion concentration. Duplex stainless steel is often used to build offshore Bridges in foreign countries.

4. For Cl ion resistance at high temperatures, Ni-based alloys are required, and the cost is very high.

Therefore, the comprehensive durability and procurement cost we should know what material to use the pump products.