板坯表面纵裂纹的原因分析及预防措施  

The Analysis and Preventive Measures to Surface Longitudinal Cracks on Wide Slab

作　　者：王小峰[1] 吕亚[1] 刘磊[1] 王新志[1] 

机构地区：[1]安阳钢铁集团有限责任公司,河南安阳455004

出　　处：《金属材料与冶金工程》2013年第2期11-14,共4页Metal Materials and Metallurgy Engineering

摘　　要：分析了宽板坯表面纵裂纹的产生原因,认为在浇注碳含量处于0.12%~0.17%包晶区的钢种、硫含量偏高且锰硫比小于30的钢种及含Nb的微合金钢种时易产生表面纵裂纹;此外还进一步分析了工艺拉速、保护渣、水口浸入深度、结晶器液面波动对表面纵裂纹的影响。结合生产实践,提出了切实可行的工艺预防措施。The reasons effected on surface longitudinal cracks of wide slab are analyzed. It is concluded that the steel in peritectic area carbon content in 0.12% - 0.17%, the steel in high sulfur content and whose Mn/S ratio less than 30 and microalloy steel containing Nb are easy to produce surface longitudinal cracks. In addition, analyzes further the effects of casting speed, protection flux, immersion depth of nozzle and level fluctuation in mold on the longitudinal surface cracks of wide slab. Uniting manufacturing practice, proposes the practicable technical measures.

关 键 词：表面纵裂纹 宽板坯 表面质量 分析 

分 类 号：TF777.1[冶金工程—钢铁冶金]