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1984年,拉赫厂把3座80吨LD转炉改成LD—KG转炉,底部吹氩气和氮气。各种不同钢种吹炼程序控制纳入到这些气体流量自动控制系统。此改造工艺由日本川崎公司提供并负责施工。生产钢种为C—Mn结构钢、热轧钢带和热轧厚板用微合金钢,以及用来深冲的铝镇静钢。现有LD转炉底部搅拌优点如下: 1、泡沫渣少,铁的收得率理想; 2、石灰、铝、锰铁合金消耗量分别减少8kg/t、0.1～0.2kg/t、0.4kg/t; 3、硫的分配率好(分配系数由7提高到9); 4、对于碳含量很低的钢种,渣中铁含量较低; 5、可生产超低碳钢种。不足是: 1、氮含量低时,氩气成本增加; 2、炉底耐火材料熔损(在1500炉的炉役中采用底吹,炉底只能吹炼1100炉): 3、钢中氮含量增加(+10～+20ppm)。该厂投资回收时间不到一年。下一步将对转炉耐火材料炉衬的改进和低碳钢的生产进行研究。
In 1984, the Rach plant changed the three 80-ton LD converters to LD-KG converters, with argon and nitrogen blowing at the bottom. Various types of steel blowing process control incorporated into these automatic gas flow control system. This modification process provided by Kawasaki, Japan and responsible for the construction. Steel grades are C-Mn structural steels, microalloyed steels for hot-rolled strip and hot-rolled plate, and aluminum-killed steels for deep drawing. The advantages of the existing LD converter bottom stirring are as follows: 1, less foaming slag and less iron yield; 2, the consumption of lime, aluminum and manganese ferroalloy is reduced by 8kg / t, 0.1 ~ 0.2kg / t and 0.4kg / 3, sulfur distribution rate is good (distribution coefficient increased from 7 to 9); 4, for the low carbon content of steel, iron content in the slag lower; 5, can produce ultra-low carbon steel. Inadequacies are as follows: 1, when the nitrogen content is low, the cost of argon is increased; 2, the melting loss of refractory in the bottom of the furnace (bottom blowing in the furnace of 1500 furnace, 1100 furnace bottom); 3, Increased content (+10 ~ +20 ppm). The plant investment recovery time of less than a year. The next step will be to improve the converter refractory lining and the production of mild steel.