Deoxidation and Desulfurization of Liquid Steel with Calcium Complex Alloys
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概要
- 論文の詳細を見る
In order to know the effect of calcium alloy on the change in the contents of oxygen and sulfur in liquid steel, the deoxidation of steel at 1600℃ was studied by the use of different calcium complex deoxidizers under the condition of the high frequency induction melting in a magnesia-lined crucible, with a covering of unslaked lime to a depth of 10mm. The results obtained are summarized as follows : (1) Although the oxygen content decreased up to 0.004% in the case of the addition of 2%SiMn, either by the addition of one lump sum at a time or by the divided additions of the same sum, the desulfurization did not significantly proceed. By the addition of calcium complex deoxidizers containing aluminum, after lowering the oxygen content, the sulfur content decreased considerably below that obtained by the addition of CaSi, CaSiMn, or CaSiBa. (2) When the oxygen content was constant, the greatest desulfurization was obtained by the divided additions of calcium complex deoxidizers containing aluminum ; that is, the S/O ratio became as low as the value of about 0.67 to 0.90, in comparison with the value of 2.3 which was obtained with CaSi or CaSiMn. (3) According to the results of electron-probe microanalysis, the compositions of the non-metallic inclusions in ingots, which were produced by the addition of calcium complex deoxidizer containing aluminum, were in such wide concentration ranges of CaO (26 to 46%), Al_2O_3 (40 to 54%), and CaS (to 34%) as indicated the presence of complex oxy-sulfide inclusions. (4) It is suggested from the differences in the yield of silicon and aluminum in ingots and in the ratio of desulfurization to deoxidation that the calcium complex alloy having the ratio of Al : Ca : Si : Mn : Fe=1 : 1 : 1 : 1 : 1 is favorable for the deoxidizer.
- 東北大学の論文
著者
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Ototani Tohei
The Research Institute For Iron Steel And Other Metals
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Kataura Yasuzi
The Research Institute For Iron Steel And Other Metals
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