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The precipitates and hydrogen permeation behavior in three kinds of hot rolled low carbon heavy plate steels for enameling were analyzed;then,both sides of the steels were enameled.The experimental results show that a large amount of coarse Ti4C2S2 and fine Ti(C,N) particles exist in the optimized Ti-bearing steel,quite a lot of fine Ti(C,N)particles exist in the optimized carbon steel,but only a little bit fine Ti(C,N) particles exist in the carbon steel.The fishscaling resistance of the steels can be correlated to the effective hydrogen diffusion coefficient,and a model of correlation between the effective hydrogen diffusion coefficient and the volume fraction of the precipitates was established and verified.The effective hydrogen diffusion coefficient should be lower than 3.96×10-6 cm2/s to avoid fishscaling in heavy plate steels.
The precipitates and hydrogen permeation behavior in three kinds of hot rolled low carbon heavy plate steels for enameling were analyzed; then, both sides of the steels were enameled. The experimental results show that a large amount of coarse Ti4C2S2 and fine Ti (C, N ) particles exist in the optimized Ti-bearing steel, quite a lot of fine Ti (C, N) particles exist in the optimized carbon steel, but only a little bit fine Ti (C, N) particles exist in the carbon steel. The fishscaling resistance of the steels can be correlated to the effective hydrogen diffusion coefficient, and a model of correlation between the effective hydrogen diffusion coefficient and the volume fraction of the precipitates was established and verified. The effective hydrogen diffusion coefficient should be lower than 3.96 × 10 -6 cm2 / s to avoid fishscaling in heavy plate steels.