福建冶金2025，Vol.54Issue(4)：20-24,5.
板坯微合金钢边部表面裂纹控制
Control of Surface Cracks on the Edges of Microalloyed Steel Slabs
程凯群1
作者信息
- 1. 福建省三钢(集团)有限责任公司,福建 三明 365000
- 折叠
摘要
Abstract
This article investigates the issue of transverse cracks on the surface of the edges of niobium-containing microalloyed steel slabs in Fujian Sangang.Through metallographic analysis and surface temperature measurement coMParison,it is found that the main reason for the generation of transverse cracks on the edges is that the edges of the cast slabs cool quickly and are prone to be in the third brittle zone during straightening.By referring to relevant materials and combining with the actual situation of our factory,two control schemes are developed.One is to reduce the spray water volume at the edges of the fan-shaped section to increase the temperature of the edges of the cast slab.The other is to conduct strong cooling of the mold foot roller spray to obtain fine ferrite with high surface plasticity.The test results show that after adopting weak cooling at the edges of the fan-shaped section,the surface defect rates of niobium-containing microalloyed steel for Slab No.1 and Slab No.2 decreased from 94.57%and 91.38%to 26.35%and 22.66%respectively.The research on the strong cooling of the mold foot roller shows that it can obtain fine ferrite with plasticity,providing another research direction for solving the edge cracking problem.关键词
含铌微合金钢/边部横裂纹/第Ⅲ脆性区/扇形段边部弱冷/结晶器足辊强冷Key words
niobium-containing microalloyed steel/transverse cracks on the edges/the third brittle zone/weak cooling at the edges of the fan-shaped section/strong cooling of the mold foot roller引用本文复制引用
程凯群..板坯微合金钢边部表面裂纹控制[J].福建冶金,2025,54(4):20-24,5.
