快削鋼の熔製に就て

概要

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High-sulphur free-cutting steel with specification C : 0.07∿0.15%, Si<0.10%, Mn 0.80∿1.20%, P 0.07% and S 0.2∿0.3%, was successfully manufactured in semi-killed ingots by a 60t basic open hearth furnace aiming at high tapping temperature and short track time. The greater part of ferro-manganese was found preferably to be added in the ladle because of stability and improvement of the yield of manganese. There was a limit, however, of the amount of ferro-manganese to be added in the ladle from the standpoint of the ununiformity of elements and the temperature drop of the molten steel in the ladle. Granulated pure sulphur of about 20mm size, packed in paper bags was added to the ladle. The yield of them was 62.9% in the average. The segregations in the ingot were the same as ordinary semi-killed steel ingots and kinds and distributions of inclusions in the ingot were the same as the other examples reported in literatures of other authors on this steel. The return scrap was to be used again as material for the steel of this sort. Most part of its manganese ran into slag and the greater part of its sulphur into slag and atmosphere, while a small part of the latter remained in the molten bath until the end of refining period, but no trouble was found in the use of the return scrap in operation.
社団法人日本鉄鋼協会の論文
1954-02-25