摘要
针对包钢Q690D宽厚板坯在连铸生产过程中出现的振痕及角裂等表面缺陷,分析了保护渣性能、结晶器振动参数、铸机冷却效果以及钢中含N量对铸坯表面缺陷的影响,通过降低保护渣黏度、提高碱度,结晶器采用高振频低振幅,控制铸坯矫直温度在900～1 300℃的塑性区,以及控制钢水中的含氮量≤50×10-6,有效地减轻了铸坯振痕,消除了星裂、角裂等裂纹的产生,提高了Q690D铸坯质量。
The surface defects such as oscillation marks and corner cracks appeared in the Q690D slab for heavy plate in Baotou Steel. In order to solve the problems, the influences of the performance of mould powder, oscillation parameters of the crystallizer, cooling effect of continuous caster and the content of nitrogen in the steel on the surface defects were analyzed. By decreasing the viscosity and increasing the basicity of mould powder, enhancing the oscillation frequency and reducing the amplitude of the crystallizer, controlling the range of straightening temperature between 900 and 1 300 ℃（the plastic zone）and controlling the content of nitrogen in the steel ≤50×10-6, the oscillation marks were lightened efficiently, the corner crack and star crack were removed and the Q690D slab quality was improved.
出处
《山东冶金》
CAS
2014年第2期34-36,39,共4页
Shandong Metallurgy
关键词
Q690D连铸坯
表面缺陷
振痕
角裂
星裂
Q690D continuously cast slab
surface defect
oscillation mark
corner crack
star crack
