The characteristics and usage conditions of common materials for plates

The index for evaluating the corrosion resistance of the material is that the greater the value of "prevention of local corrosion equivalent PRE", the better the corrosion resistance. Mainly determined by the content of Cr, MO, Ni.

1) 304 stainless steel: used in organic and inorganic media, concentration <30% temperature <= 100/concentration> 30% temperature> 50 temperature> 100 various concentrations of carbonic acid, ammonia and alcohol The material of 304L is basically the same as the material of 304, which has better weldability and can be used as a welded heat exchanger.

2) 316L natural cooling water, cooling tower water, demineralized water, carbonic acid, acetic acid and solutions with a concentration of less than 50%, alcohols and other solvents, dilute (﹤20%) dilute phosphoric acid (﹤30%) with a temperature of less than 100 degrees,But not suitable for sulfuric acid. 316 is basically the same as it.

3) 317 is suitable for more use conditions than 316L.

4) AISI904L and SUS890L are cost-effective and better than the above materials. Particularly suitable for general sulfuric acid, phosphoric acid and halides.

5) SMO 254 stainless steel, which improves the MO content, is a super stainless steel modified for 316. It has excellent resistance to chloride and crevice corrosion. Suitable for salt water and inorganic acids.

6) SMO654 is a better material than 254 and can be used in cold seawater.

7) RS-2 (0Cr20Ni26Mo3Cu3Si2Nb) stainless steel, which is domestically produced equivalent to 316, has better resistance to stress corrosion and can be used for temperatures above 80 degrees. (Concentration 90%-98%)