Abstract: A technology of low superheat casting for 150 mm x 150 mm billet by two rollers cooling has been put forward ,that is the molten steel flowing out from tundish into mold through cooling turning rollers to reduce molten steel superheat and improve quality of casting billet. The results of numerical simulation for a 0. 45C steel by hydromechanics analysis software indicated that the superheat of molten steel through cooling roller reduced, the impact depth of molten steel flow in mold was up to 250 mm, it was available to break columnar crystal at forward position of solidification, moreover the molten steel flow field and temperature field in mold distributed homogeneously and the solidification condition of casting billet improved obviously.

Key words: Low Superheat, Temperature Field, Flow Field, Casting Billet, Numerical Simulation

摘要： 提出了一种双辊冷却低过热度浇铸150 mm×150 mm方坯的技术,即使从中间包流出的钢水通过转动的冷却辊浇入结晶器内,通过降低钢水过热度改善铸坯质量。借助流体力学分析软件,对0.45C钢水的数值模拟结果发现,通过冷却辊冷却的钢液过热度降低,结晶器中钢水流冲击深度达250 mm,有利于打断凝固前沿的柱状晶,扩大等轴晶比例,同时结晶器内的钢液流场和温度场分布均匀,且铸坯的凝固状况也明显改善。

关键词: 低过热度, 温度场, 流场, 连铸方坯, 数值模拟