Analysis of Fishscaling Resistance of Low Carbon Heavy Plate Steels

The precipitates and hydrogen permeation behavior in three kinds of hot rolled low carbon heavy plate steels for enameling were analyzed1 then, both sides of the steels were enameled. The uperimental results show that a large amount of coarse Ti 4 C 2 S 2 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 cllifusion 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 cm 2 /s to avoid fishscaling in heavy plate steels.