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一、前言我厂6T地坑式空气侧吹转炉,渣中∑FeO在35—55％之间,生产采用上小下大的8吋锭模。这种工艺生产出来的钢锭内部缩孔严重,并且缩孔表面被大量夹杂污染,轧制时不能焊合,造成轧裂。我厂80年3月实行退废制度,那时因钢锭缩孔造成轧裂的钢占炼钢车间总废品量的47.6％,尤其在轧制小元钢时,轧裂钢占钢锭总废品量的82.4％。钢锭质量差不仅增加了炼钢车间的退废量,而且给小轧车间的生产带来很大困难。一支缩孔废品经常引起后面几支钢坯不能继续轧制而报
I. INTRODUCTION Our factory 6T pit-type air-side blowing converter, slag ΣΣFeO between 35-55%, the production of small big 8-inch ingot mold. This process produces severe internal shrinkage of ingot ingot, and shrinkage surface is contaminated by a large number of inclusions, welding can not be welded, resulting in rolling cracks. I plant in March 80 to implement the retirement system, when the shrinkage caused by shrinkage of steel steel accounted for 47.6% of the total amount of waste in the steel shop, especially in the rolling of small steel, the total amount of scrap steel ingot Of the 82.4%. The poor quality of steel ingot not only increases the amount of steel scrap in the steelmaking plant, but also brings great difficulties to the production of small steel rolling stock. A shrinkage of scrap often caused by several billet can not continue rolling behind