Cr is also one of the alloy elements to improve the atmospheric corrosion resistance of 05CuPCrNi steel plate, but it has obvious effect only with the combination of Cu. The corrosion potential of Cr is low, and Cr is an element with passivation tendency, which promotes the formation of dense oxidation passivation film on the surface of 05CuPCrNi steel plate in the atmosphere, so as to improve the corrosion resistance of 05CuPCrNi steel plate.
In the process of atmospheric corrosion, the content of Cr should be controlled within 0.30%-0.45%. Ni is also one of the effective alloying elements for atmospheric corrosion resistance. When Ni content is less than or equal to 1% and Cu is contained in 05CuPCrNi steel plate, the effect of improving corrosion resistance is not obvious. However, the alloy phase can be formed when the ratio of Ni to Cu is 1:3. Therefore, controlling the Ni content of 0.3% Cu in 05CuPCrNi steel plate to be greater than 0.1% can prevent the cracking of 05CuPCrNi steel plate during hot rolling.
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