二次精錬プロセスの開発と低酸素, 低硫鋼溶製法の確立

概要

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Recently the needs of ultra low [S] and ultra low [O] steel for many kinds of products increase. Secondary refining process to achieve less than 5ppm sulfur and less than 10ppm oxygen in molten steel was investigated. In order to produce ultra low sulfur steel the optimum slag composition was determined as 60%CaO-32%Al_2O_3-8%SiO_2 and the deviation of final slag composition could be decreased by the method of 2 times flux addition. In the case of producing ultra low oxygen steel, it was important for increasing deoxidation rate that the total content of FeO+MnO in slag before RH process was less than 1wt% and then deoxidizing products were removed through RH process. On the basis of these results, the refining process, BOF-VSC-NKAP-GI-RH process, was established. By this process it became possible to achieve less than 5ppm sulfur and less than 10ppm oxygen in steel.
社団法人日本鉄鋼協会の論文
1986-07-01