Stainless Steel Anti-Corrosion Performance Difference in Domestic Hot Water Heat Pump?
For a domestic hot water heat pump, the water tank stainless steel materials always have three options: Duplex 2205, SS316L and 304.
In the anti-corrosion performance aspect, Duplex is better than SS316L, and SS316 is better than SS304.
The element molybdenum(MO) is widely used in the production of stainless steel alloys and well known that it is very efficient for improving anti-corrosion resistance.
Obviously the resistance level is based on the MO element percentage in the stainless steel material.
In duplex stainless steel, the MO percentage is from 3%-3.5%, 2-2.5% in 316L, and 0 in SS304 stainless steel.
Duplex stainless steel’s anti-corrosion resistance level is better than SS316L, and SS316L is better than SS304.
There is another element NICKEL affects the resistance. In 304 SS material, NICKEL percentage is 9% and it is 12% in SS316L. Proving that SS316L resistance level is higher than SS304.
What type of water tank stainless steel shall I promote to my customers?
SS304 material water tanks for hot water is very rare in the market, especially in Europe.SS316L leads the market and the Duplex SS type is becoming more and more popular. More and more factories prefer Duplex SS and its cost goes down. Surely the local laws and regulations, homeowners habitats, and whale brands are good directions.