IF钢中细小夹杂物的控制

Control of the Fine Inclusion in IF Molten Steel

高纯净度钢的生产是21世纪钢铁企业面临的重大课题,对钢中全氧含量和夹杂物含量的控制是生产高纯净IF钢的关键技术。为此笔者提出一种全新的夹杂物控制技术——反应诱发微小异相去除钢液中细小夹杂物的工艺,设计了一种具有该种功能的复合球体,并开展了工业现场试验研究。试验结果表明:反应诱发微小异相去除细小夹杂物工艺是一种成本低、效率高、简便易行的夹杂物控制技术,它可以显著降低IF钢中非金属夹杂物数量。与传统工艺相比,采用该技术对钢液进行处理后,铸坯中氧化物夹杂的数量明显减少,尺寸变小,铸坯的平均w([TO])最低可达7×10-6,吨钢成本可降低5～10元。

The production of high purity steel was a major task for the iron and steel enterprises in the 21st century.Decreasing the total oxygen content and the inclusion removal was the key technique to produce the high purity IF steel.A novel fine inclusion removal technology due to the dispersed in-situ phase induced by the composite ball explosive reaction was put forward.A composite ball with the function was designed and prepared using a laboratory model batch type balling disc（at 12 r/min） and the composite ball was fed at the end of RH refining.The results indicate that feeding composite ball in RH furnace is a novel technology and the inclusion in the molten steel can be removed effectively.The treatment time is less than 10 minutes.Compared with conventional inclusion removal technology,the number of the oxide inclusion can be decreased to a lower level and the inclusion size becomes finer.Using this novel technology,the total oxygen in the as-cast slab can approach to 7×10-6 and the steel production cost for per ton can be reduced by 5-10 yuan.