The sulfuric acid dew corrosion- resistant steels are low alloying steels for heat exchanging component. There are two kinds of sulfuric acid dew corrosion- resistant steel:(1)base alloy elements-0.2%～0.5%Cu-＞0.010S adding a small quantity P

Sn

As

Sb

Se

or Te;(2)Cu-Cr or Cu-Cr-Ni steels for corosion environ ment of concentrated sulfuric acid(80%～90%)at elevated temperature(130～160℃).The characteristics of sulfuric acid dew point environment are briefly introduced

and the mechanism of effect of alloy elements on sulfuric acid dew point corrosion-resistance of the low alloy steel are discussed and the chemical compositions

mechanical properties and corosion resistance of domestic and foreign current main low alloying sulfuric acid dew point corrosion-resistant steels are presented in this paper.