CHARACTERISTICS AND OPERATING CONDITIONS OF COMMON MATERIALS USED IN PLATE HEAT EXCHANGER

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Characteristics and operating conditions of common materials used in plate heat exchanger
The criterion for evaluating the corrosion resistance of materials is that the greater the bipre value, the better the corrosion resistance. It is mainly determined by the contents of Cr, MO and Ni.
1)304 stainless steel: used in organic and inorganic media, concentration <30% temperature <=100/ concentration >30% temperature 50
Various concentrations of carbonic acid, ammonia and alcohols of nitric acid temperature <100. The material of 304L is basically the same as that of 304, which has better weldability and can be used as welding heat exchanger.
2)316L of natural cooling water, cooling tower water, softening water, carbonic acid, acetic acid and caustic soda solutions with concentrations less than 50%, alcohols and acetone and other solvents, dilute nitric acid (20%) dilute phosphoric acid (< 30%) at temperatures less than 100 degrees, but not suitable for sulfuric acid. 316 is basically the same as that.
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 3)317 is suitable for more situations than 316L.
4)AS904L and sUs89oL are cost-effective and better than the above materials. It is especially suitable for sulphuric acid, phosphoric acid and halides in general.
5)SMO254 advanced stainless steel, improved MO is, is the 316 improved super stainless steel. It has excellent resistance to chloride and crevice corrosion. It is suitable for inorganic acid containing salt water.
6) better material SMO654254 can be used in cold sea water.
7) rs-2 (0Cr20Ni26Mo3Cu3Si2Nb) stainless steel, which is the domestic equivalent of 316, resistant to stress corrosion better
Can be used for concentrated sulfuric acid above 80 degrees (concentration 90%-98%)

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