›› 2015, Vol. 31 ›› Issue (5): 42-46.

• 试验研究 • 上一篇    下一篇

连铸二冷模式对微合金钢板坯角部表层组织的影响

黎建全1,2,周明佳1,1,李云峰1,1,侯自兵3,唐萍4,文光华1,5   

  1. 1.
    2. 攀钢集团攀枝花钢钒有限公司
    3. 重庆大学材料科学与工程学院冶金工程系
    4. 重庆大学材料科学与工程学院冶金系
    5. 重庆大学
  • 收稿日期:2015-01-06 修回日期:2015-02-05 接受日期:1900-01-01 出版日期:2015-10-05 发布日期:2015-10-05
  • 通讯作者: 黎建全 E-mail:fpljq@sina.com
  • 基金资助:
    微合金钢连铸过程铸坯表层原始奥氏体晶粒细化研究

Effect of secondary cooling patterns on corner subsurface microstructure of microalloyed steel slab during continuous casting

  1. 1.
    2. College of Materials Science and Engineering, Chongqing University
  • Received:2015-01-06 Revised:2015-02-05 Accepted:1900-01-01 Online:2015-10-05 Published:2015-10-05
  • Contact: Li Jianquan E-mail:fpljq@sina.com

摘要: 为了减少和预防攀枝花钢钒有限公司P510L微合金钢连铸角部裂纹的发生,进行了不同二冷区冷却模式对铸坯角部表层组织及表面横裂纹的影响研究。结果表明:传统弱冷模式下,大量膜状先共析铁素体连成网状,阻碍了奥氏体基体的连续性,降低了铸坯角部的热塑性。在优化冷却模式下,在铸坯角部表层2-3mm内的组织细小、分布均匀,没有出现先共析铁素体膜,有利于控制铸坯表面横裂纹的发生。相对于传统弱冷模式,优化冷却模式可将铸坯角部表面横裂纹指数由3.2降至0.4,使裂纹发生率得到了控制。

关键词: 连铸, 微合金钢, 微观组织, 表面横裂纹

Abstract: In order to decrease and prevent the occurrence of slab transverse corner crack, effect of secondary cooling pattern on slab corner subsurface microstructure and related surface corner transverse crack was investigated via casing of P510L steel using a slab arc continuous caster. It is shown that, under the mild cooling pattern, the formation of continuous matrix was separated by the film-like ferrite along the prior austenite grain boundary, which decreased the hot ductility of slab subsurface; under the control cooling pattern, the microstructure was even and film-like ferrite was inhibited in the range of 2-3mm to the slab surface, resulting in promoting the reduction of transversal cracking susceptibility. And compared to the mild cooling pattern, under the optimized cooling pattern, the crack index fell from 3.2 down to 0.4.

Key words: continuous casting, micro-alloyed steel, microstructure, surface transverse cracks