摘要:
针对裂纹敏感性钢种的凝固特点,分析了应用于该钢种保护渣应具有的理化性能,提出提高保护渣结晶率,控制传热是解决裂纹敏感性钢种出现纵裂、凹陷及粘结漏钢等质量缺陷和事故的主要途径。在保护渣性能测试及实验室研究的基础上,给出了两种不同的优化思路:方案一为高碱度高结晶率优化方案,方案二为低碱度高结晶率优化方案,结合国内不同钢厂进行应用实践。使用方案一的保护渣结晶问题得到很好地解决,保护渣的析晶率达到80%,铸坯表面平整,纵裂比例控制到0.87%。使用方案二的保护渣的结晶率接近80%,很好地解决了低碱度保护渣不容易结晶的问题,优化后的铸坯表面平整,纵裂、凹坑等问题得到明显控制。
关键词:
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连铸 /
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裂纹敏感钢 /
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保护渣 /
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纵裂 /
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碱度 /
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结晶
Abstract:
According to the solidification characteristics of crack sensitive steel,the physical and chemical properties of the mold fluxes which could be applied in the steel are analyzed,and the improvement of the crystallization rate of the mold fluxes and the control of heat transfer are the main measures to solve the defects such as the longitudinal defects,the depression and the leakage of the steel.Based on the tested performance of mould slag and experimental results,two kinds of measures have been put forward,ie,high basicity high crystallization rate（S1） and low basicity high crystallization rate（S2） With implement of S1,the crystallization rate of the mould slag has reached 80%,the surface of the billet is flat,and the ratio of longitudinal cracks is controlled to 0.87%. The crystallization rate of the mould slag used in scheme 2 reaches 80%,which well solves the problem that the low basicity slag is not easy to crystallize. The surface of the cast slab after optimization is flat,and the problems such as longitudinal cracks and pits are well controlled.
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