Abstract：The heat transfer model for solidification of continuous casting billet has been established, based on a round caster in a steel plant. The simulation and optimization were carried out at different drawing speeds when continuous casting billet with diameter of 280 mm was in secondary cooling process. Suitable secondary cooling scheme of 16MnNb steel was determined. When the drawing speed is the minimum of 0.9 m/min, the inner arc surface temperature of billet is 947 ℃ at straightening point, which can effectively avoid the secondary low ductile zone. When the round billet comes out of mould at the maximum drawing speed (1.2 m/min), the thickness of the solidified shell is 19 mm. Some problems such as breakout hardly happen. The section temperature is uniformly distributed under different drawing speed conditions. The macro inspecting indicates that the round billet surface and internal quality are good. Crack and contraction cavities and other defects were not found.
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2014, Vol. 49 
