Corrosion Resistance of New BGNDMA Low-Alloy Steel

The microstructure, tensile properties and corrosion resistance of a new BGNDMA low-alloy steel were studied and compared with the properties of 09CrCuSb steel and 2205 duplex stainless steel. The results show that the microstructure of the BGNDMA steel was ferrite and pearlite, and the tensile properties were better than those of 09CrCuSb steel. When immersed in 70 ℃, 50wt% H₂SO₄ solution for 24 h, the corrosion rates of most samples were not higher than 80 g·m^-2·h^-1, and the statistical average value was about 36.367 g·m^-2·h^-1, indicating the excellent resistance to sulfuric acid corrosion. In the dead green liquor and the industrial flue gas dew point (not higher than 80 ℃) corrosion environment, the BGNDMA steel underwent uniform corrosion, and 2205 duplex stainless steel underwent local corrosion such as pitting corrosion and crevice corrosion; BGNDMA steel was expected to replace 2205 duplex stainless steel in H₂SO₄-HCl mixed acid dew point corrosion environment. In an industrial flue gas dew point corrosion environment, the corrosion resistance of the hot rolled BGNDMA steel was better than that of the normalized steel.