造塊作業の研究 (IV) : 鋼塊内に於けるサンドの分布及びその一考察

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The authors studied on the distribution of sand and the causes of it concerning silicon or silicon-aluminum killed low-carbon Cr-Mo steel ingots which were melted with an Heroult electric furnace. The results obtained were as follows : (1) Ingot No. 1 (which was deoxidized with manganese and silicon in the furnace.) Content of sand was at minimum at the outside and it increased as the inspection went inside, but MnO/SiO_2 and (FeO+MnO)/SiO_2 in it showed a reverse change against the above results, while FeO and MnO decreased and SiO_2 increased as the inspection went inside. But the sand content was low at the center of ingot top. The sand at the outside of ingot where the total amount of the sand small, had no constant forms and were very large, but as the inspection went further inside they became spherical and very fine in size. It was concluded that the large sand at the outside of ingot were not deoxidation products produced in the mold but most of it had been included in the molten steel just before casting. These large sands were not found at the inside, and as the inside portion was cooled slowly in comparison with the outside portion, it could be supposed that these large sand floated up in the mold during solidification. On the other hand, the total content of sand showed the maximum value at the inside and their form was finely spherical and as SiO_2 increased but FeO and MnO decreased in their composition in comparison with the inside. It was concluded that this fine and spherical sand at the inside were deoxidation products produced in the mold during solidification. (2) Ingot No. 2 (which was deoxidized with manganese and silicon in the furnace and added to aluminum in the ladle.) Content of sand was at maximum at the outside and it decreased as the inspection went inside but at the neighbourhood of the bottom it did not show a low content. This sand was composed of Al_2O_3, and then SiO_2, FeO and MnO in sand were very few and had fine and no constant forms. It was concluded that this sand was deoxidation products by aluminum and most of it was not produced in the mold but in the ladle.
社団法人日本鉄鋼協会の論文
1954-12-25

造塊作業の研究 (IV) : 鋼塊内に於けるサンドの分布及びその一考察

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