Investigation on Carbonizing From Mold Flux into Ultra-low-Carbon Steel During Continuous Casting

Carbonizing phenomena from carbon-containing mold flux into ultra-low-carbon liquid steel have always been one of the important factors affecting surface quality continuous casting billets. An experimental method has adopted in this investigation to study carbonizing behavior during steel, and locations where occurs process were predicted by ANSYS Fluent numerical simulations. The results indicate that low-carbon with carbon concentration 2.19 pct would form thickness about 1500 μm, high-carbon 3.64 over 4000 μm when steel–mold contact for 20 seconds at high temperature. And metallographic structure primitive ferrite firstly precipitates chain pearlite ferritic grain boundary then grows up flake pearlite. Furthermore, simulation show phenomenon is likely occur a quarter width thin slab there are violent free fluctuations process, which consistent found actual production sampling.