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针对厚板坯和中薄板坯连铸两条工艺路线生产的超低碳钢,采用相关手段分析了钢水从钢包到中间包的二次氧化、稳态和非稳态铸坯全氧、总体夹杂物水平、铸坯大颗粒夹杂物比例等。结果表明,两种工艺路线生产的超低碳钢在稳态浇注时铸坯洁净度基本一致;非稳态浇注时中薄板生产线钢水洁净度低于厚板坯连铸;受中薄板连铸结晶器和水口形状的制约,其水口结瘤现象较厚板坯连铸严重得多。作为中薄板连铸向薄板坯连铸的过渡,若在薄板坯连铸生产线实现正常浇注超低碳钢,进一步提高钢水洁净度、设计合理的浸入水口结构、稳定的连铸操作是亟待解决的问题。
For the ultra-low carbon steel produced by the two process routes of thick slab and medium-thin slab continuous casting, relevant methods were used to analyze the secondary oxidation of molten steel from ladle to tundish, the total oxygen content of steady state and unsteady slab, Material level, the proportion of large particles inclusions and so on. The results show that the ultra-low carbon steel produced by the two process routes is basically the same in the steady casting; the cleanliness of the molten steel in the thin plate production line is lower than that of the thick slab during the unsteady casting; The shape of the nozzle and the nozzle constraints, the nozzle nodular thicker slab casting much more serious. As the transition from thin slab continuous casting to thin slab continuous casting, if the ultra-low carbon steel is cast normally in the thin slab continuous casting production line to further improve the cleanliness of molten steel and design a reasonable immersion nozzle structure, the stable continuous casting operation is urgent to be solved problem.