According to the application of the research on industrial pure titanium at home and abroad in recent ten years, titanium material is an ideal material that can fully meet the above requirements in the production of salt and nitrate because: 1, laboratory and production practice have proved that titanium In the range of not higher than 140 ℃, sodium chloride solution of various concentrations is almost not corrosive, than stainless steel 316L and copper-nickel alloy, etc. have much higher corrosion resistance. 2. Titanium also has high corrosion resistance in high flow rate media (including sodium chloride). Due to its ability to rapidly repair its protective oxide film, titanium is highly resistant to corrosion. 3, titanium in sodium sulfate solution and ammonia, ammonia corrosion resistance is also good at various temperatures, concentrations of corrosion rate of less than 0.13mm / year. 4, industrial titanium on the contact corrosion, pitting, intergranular corrosion, stress corrosion are not sensitive. 5, titanium due to poor infiltration of the surface oxide film, the surface smooth and non-corrosive, so the surface is not easy scaling, better than other metals. Although the thermal conductivity of titanium is similar to that of stainless steel (thermal conductivity of 14 kcal / square, hour, ° C), titanium has good corrosion resistance, thinner wall and less fouling on the surface, generally preventing heat transfer Of the film-like dirt, so the heat transfer efficiency of titanium is very high. Foreign experiments show that titanium heat transfer coefficient close to the Navy brass, suitable for heat exchanger materials.