ND steel pipe is currently one of the best stainless steel plates used in countries around the world for resistance to sulfuric acid ultra-low temperature dew point corrosion. The key assessment standard for ND seamless steel pipe is immersion in a 70 degree and 50% H2SO4 aqueous solution for 24 hours. If the corrosion rate does not exceed 14mg/cm · h, compared with carbon steel, similar steel imported from Japan, and stainless steel plates, its corrosion resistance is 1.84 times that of Japanese CR1R steel, 2.97 times that of 1Cr18Ni9 steel, 8.63 times that of Corten steel, and 14.11 times that of Q235B steel. ND steel is heated in a furnace; The main purpose of the heat exchanger, exhaust pipe, chimney and other components of the heating furnace is to develop and design hot-rolled steel and steel pipes with excellent resistance to sulfuric acid dew point corrosion. Its excellent resistance to sulfuric acid dew point corrosion and high cost-effectiveness make it a complete replacement for stainless steel plates. In terms of sulfuric acid dew point corrosion resistance, it is the raw material.