造塊作業の研究 (III) : 取鍋内に於ける酸性及び鹽基性兩平爐鋼中の非金属介在物の變化

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The authors studied on the changes of non-metallic inclusion in acid and basic open hearth furnace steels (0.3% C, 0.3∿0.4% Si, 0.4∿0.5% Mn) in the ladle (capacity ; 65ton) during the ingot casting process, with results of observation on sand by the hot HNO_3 method. And the authors evicenced the difference between acid and basic open hearth furnace steel on the characteristics of origination and variation of non-metallic inclusion in them during the ingot casting proccess. 1) In the early period of ingot casting process, the basic molten steel made the sand increased but the microscopic non-metallic inclusion decreased and the acid molten steel caused to decrease both inclusions in comparison with the molten steel before tapping. 2) In the middle of ingot casting process, the sand and microscopic non-metallic inclusion of acid molten steel kept the low value and the microscopic non-metallic inclusion of basic molten steel kept low value, but the sand of it showed the high value in those ladles. 3) At the end period of ingot casting process, the acid molten steel caused to increase the both inclusions, but the basic molten steel did not show any large variation in comparison with the inclusion in middle of ingot casting process. 4) By passing throngh the tundish, basic molten steel showed large variation of both inclusions, but acid molten steel did not show any large variation of them.
社団法人日本鉄鋼協会の論文
1953-05-25