攀钢板坯连铸机不同断面铸坯角部横裂纹分析

详细信息

Analysis on corner transverse cracks of slabs with different section dimensions cast with Pangang slab casting machine

1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Pangang Group Panzhihua Steel & Vanagium Co. Ltd., Panzhihua 617000, China

摘要: 通过喷嘴性能测试、重熔凝固冷却实验和计算机仿真软件计算,研究了攀钢不同断面板坯角部冷却情况对铸坯角部横裂纹的影响.研究表明:对于1160、1080和1250mm三个断面尺寸的铸坯,较强的冷却使角部温度较早低于A₃温度,矫直前沿奥氏体晶界形成大量膜状先共析铁素体,矫直时容易沿奥氏体晶界形成角部横裂纹.为解决角部横裂纹问题,通过改变铸坯表层组织来控制铸坯角部横裂纹的产生,并将其应用于攀钢现场生产.
- 连铸 /
- 二次冷却 /
- 裂纹 /
- 微观组织控制
Abstract: The effect of cooling conditions on the corner transverse cracks of slabs with different section dimensions was studied by nozzle performance measurements, remehing and solidification cooling experiments and numerical simulations. The results show that the corner temperature is lower than the A₃ temperature earlier for slabs with section dimensions of 1000, 1160 and 1250 mm during a stronger cooling. There is a large number of film-like proeutectoid ferrite along grain boundaries, and transverse cracks form along prior austenite grain boundaries when straightening. To prevent from these transverse cracks, a process to control the surfaee mierostrueture of a slab was adopted and applied to actual production at Pansteel.
- continuous casting /
- secondary cooling /
- cracks /
- microstructure control