连铸坯皮下气泡缺陷成因及控制

皮下气泡是连铸坯常见的质量缺陷,严重影响钢材的质量及使用性能。通过对国内部分钢厂生产的连铸坯皮下气泡的缺陷情况进行总结分析,发现一氧化碳气泡缺陷和氩气泡缺陷占很大比例。其次,总结概述了连铸坯皮下气泡缺陷的分布特点,气泡被捕获的机理以及不同类型气泡缺陷的形成原因,发现脱氧不良、水口吹氩工艺、电磁搅拌以及过热度等均会对皮下气泡缺陷造成影响。为降低铸坯皮下气泡缺陷产生的不良影响,提出了控制连铸坯皮下气泡缺陷的有效措施,以期为实际生产提供参考。

Causes and control of subcutaneous bubble defects in continuous casting billets

Subcutaneous bubbles are common quality defects of continuous casting billets, which seriously affect the quality and performance of steel. The situation of subcutaneous bubble defects in continuous casting billets of some domestic steel mills was summarized and analyzed. And it was found that the defects of carbon monoxide bubbles and argon bubbles accounted for a large proportion. Then the distribution characteristics of subcutaneous bubble defects in continuous casting billets, the mechanism of trapped bubbles, and the causes of the formation of different types of bubble defects were summarized. It was found that incomplete deoxygenation, nozzle argon blowing process, electromagnetic stirring and degree of superheat, etc., could affect the subcutaneous bubbles defects. In order to reduce the adverse effects caused by the subcutaneous bubbles defects in continuous casting billets, the effective measures to control the defects were put forward, which could provide a reference for actual production.