キルド鋼の非金属介在物に関する研究 (III)

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(1) The relation between the cooling conditions of ingot bottom and the flow-up speed of macroscopic inclusions were researched. Here the experimentally designed 500kg ingot molds whose bottoms were lined with refractories were compared with the normal molds by investigation of experimental ingots or forged billets. Al additions in the ladle were 200∿500 g/t. The results obtained were as follows. (i) The streak seams were far less found in the bottoms of the ingots which were made with the special molds using refractories at their bottoms than in those with normal molds. (ii) When Al additions in the ladle were 210 g/t, Fe-Mn-Al silicate-seams with high Al_2O_3-content were found in the sample-ingots, but the seams of Al_2O_3-type increased by addition of 500 g/t Al. These silicate-seams presumably had been molten in the mold because of the appearance of almost perfect sphere, while Al_2O_3-seams (cubic crystals) had been at solid state in the molten steel. (iii) The relations between the crystal structure of ingot and the seams-distribution were not clearly recognized. (iv) A small secondary pipe was found in the ingot bottom which was made by the special mold. (2) The relations between the crystal structure of ingots and the seams-distribution in 5 ton practical ingot (top-poured) were investigated. (i) The seams almost never occurred in the columnar crystals. (ii) The seams were found at random within the end of columnar crystals at the ingot-bottom. These inclinations of seams-distribution presumably were as much influenced by other causes as by crystal structure. (iii) The group seams which were very rarely found in the ring ghost were recogniged to have been influenced by segregation at the solidification of the ingot.
社団法人日本鉄鋼協会の論文
1957-02-01

キルド鋼の非金属介在物に関する研究 (III)

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