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CSP薄板坯连铸开浇炉次大型夹杂物研究与控制
Investigation and Control of large Inclusion During CSP Thin Slab Continuous Casting Start Process
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- DOI:
- 作者:
- 谯德高 冯海军 冯永平 谢健
QIAO Degao;FENG Haijun;FENG Yongping;XIE Jian
- 作者单位:
- 酒泉钢铁（集团）有限责任公司
Jiuquan Iron and Steel(Group)Co.,Ltd.,Jiayuguan 735100,China
- 关键词:
- 开浇炉次 钙铝比 钢液二次氧化 大型夹杂缺陷
casting start calcium-aluminum ratio molten steel reoxidation large inclusion defects
- 摘要:
- 某钢厂CSP薄板连铸生产高强汽车用钢、家电用钢等产品,开浇炉次卷板表面大型夹杂缺陷对产品质量造成严重危害,通过在中间包取样,采用扫描电镜、氧氮分析、光谱分析等手段,结合现场工艺参数,对产生夹杂缺陷的影响因素进行了分析研究。结果表明,造成CSP薄板坯开浇过程结晶器液面波动的主要原因为钢液二次氧化生成大量的夹杂物,以及钢液钙铝比控制不合理,造成钢液流动性变差。基于研究结果提出了相应的控制措施,开机炉次大型夹杂缺陷率降低了35.82%。The large inclusion defects of high strength automobile steel and household appliance sheet seriously affect the product quality during CSP casting start process in a steel plant.The influencing factors of inclusion defects were studied by means of the SEM,oxygen and nitrogen analyzer and spectral analysis,in terms of process parameters.The results show that the main reasons for the fluctuation of molten steel liquid level in crystallizer during CSP thin slab casting are the large amount of inclusions generated by the secondary oxidation of molten steel,and the unreasonable control of the calcium-aluminum ratio of molten steel,resulting in the poor fluidity of molten steel.Based on the research results,the corresponding control measures are proposed,and the failure rate of secondary large inclusion is reduced by 35.82%during casting start process.