ABSTRACT

The corner crack is an important issue during special steel continuous casting. To comprehensively investigate the heat transfer, stress, and shrinkage behaviours of slab corner, a full-scale thermo-mechanical model of a slab and its mould was developed, the inverse algorithm was applied to the model. The model was validated by comparing the calculated data with the measured data in the plant trials. The results showed that the thermo-mechanical behaviours of the slab corner showed a similar tendency but were not the same, which reflected the necessity of building a full-scale model. There exists ‘hot spots’ at the slab off-corner region, and its position moved away from the corner along the casting direction, which affects the temperature and stress distributions. The maximum stress value reached approximately 16 MPa at the mould exit. The model provides an in-depth understanding of slab corner during special steel continuous casting.

摘要

角裂是特钢连铸过程中的一个重要问题。为了全面研究板坯角部的传热、应力和收缩行为，开发了板坯及其结晶器的全尺寸热机械模型，并将逆算法应用于该模型。通过将计算数据与工厂试验中的测量数据进行比较来验证该模型。结果表明，板坯角部的热力学行为表现出相似但不相同的趋势，这反映了建立全尺寸模型的必要性。板坯角部区域存在“热点”，其位置沿浇铸方向远离角部，影响温度和应力分布。模具出口处的最大应力值达到约 16 MPa。