固定鹽基性平爐に依る特殊熔解法に就て

概要

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In the stationary basic open hearth furnace used heretofore, which has a difficulty in substituting slags, the slag usually contains more than 10% of SiO_2, so that there is a limit around 0.01% P and 0.02% S in the usual refining. However, the author made success in practicing a Hoesch-system refining two times using a Merz-type open hearth furnace and managed to obtain a steel melt with 0.003∿0.010% P and 0.006∿0.012% S. The following are the conclusions from viewpoint of the actual operation : (1) It is recommended to keep the CaO/SiO_2 in the slag to the second order in the first melting, to tap as soon as possible before the failure of the furnace bed, and, in the second melting, to make the highly basic slag with the CaO/SiO_2 of the fourth order as soon as possible. (2) Therefore, a considerable quantity of fluorite should be used to retain a suitable quantity of CaF_2 in the slag. (3) The Mn in the steel melt should be retained at least up to 0.2% in the case of the second melting, to make the desulphurization effective.
社団法人日本鉄鋼協会の論文
1942-08-25