エレクトロン・ビーム溶解における SUS 304, NCF-1 合金中の不純物元素の挙動(<特集>鋼の特殊精錬)

概要

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The purpose of this work is to present experimental results of impurity elimination during electron-beam melting (EBM) of SUS 304 and NCF-1 alloys. A continuous drip-type EBM furnace of 30kW max. Power and water cooled copper mold of 55mm in inner diameter were used. SUS 304 alloy was twice melted at a given melting rate, while NCF-1 alloy was melted for once. Concentration changes of elements in the alloys were summarized as follows : Remarkably decreased : Sb, O, Mn for SUS 304, and Pb, Bi, O, Mn for NCF-1. Decreased : Cu, Zn, N, Cr, for SUS 304, and Cu, Sb, N, Cr for NCF-1. Slightly decreased : As, Pb, (Sn, S) for SUS 304, and Sn, S for NCF-1. Unchanged or increased : Si, P, Al, Ni, C, B, for SUS 304 and As, C, Si, P, Ni, Fe for NCF-1. NCF-1 alloy was also melted by VAR, ESR, MSR, and PAM by using laboratory-scale furnaces. Removal degree of impurities during these melting processes were compared with that of EBM as to certify the superiority of EBM for the impurity removal.
社団法人日本鉄鋼協会の論文
1977-11-01