一、前言随着世界科技和工业生产的发展,对钢的品种、质量要求日趋严格。为此,许多工厂均采用炉外精炼技术来达到此目的。由于宝钢转炉容量大,冶炼周期短,时间间隔均衡,而且产品方案中的钢管钢和连铸优质坯都需要尽可能地降低钢中的气体、夹杂及控制狭窄范围的化学成份和钢液温度,所以选 I. Introduction With the development of world science and technology and industrial production, the varieties and quality requirements of steel are becoming more and more stringent. To this end, many factories are using furnace refining technology to achieve this goal. Due to the large capacity of the converter in Baosteel, the short smelting cycle and the balanced time interval, the steel pipe and continuous casting high quality billets in the product scheme all need to reduce the gas, inclusions and the narrow range of chemical composition and molten steel temperature in the steel as much as possible, So choose