電磁界鋳型による鋼の連鋳鋳片表面性状の改善

概要

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In order to improve surface quality of continuously cast steel, the investigation applying alternating magnetic field on initial solidification shell was carried out. The capacity of electric generator is 200kW, and frequency is 20kHz. Mold size is 150mm and 180mm square, and the upper part of mold is divided into 28 segments and surrounded with coil. 0.12% carbon steel which has high crack sensitivity, was cast to verify the effect of alternating magnetic field on the billet surface quality. Casting speed ranges from 0.4 to 1.3m/min. At the casting, a mold flux was used. Surface roughness caused by mold oscillation and meniscus fluctuation can be remarkably decreased by applying optimum magnetic flux density distribution. In case of no magnetic field, average surface roughness caused mainly by mold oscillation is about 600 to 700μm and the deepest one reaches to 1300μm. However, when the electric power of 150kW is applied, the average roughness can be improved less than 300μm. When too much power is applied, the surface roughness worsens. It can be also cleared that there must be an optimum condition of the distance between coil and meniscus. The relation between the coil and meniscus position is an important factor to realize a soft contact situation between the solidified shell and mold. Shell formation in the electromagnetic mold was also examined.
社団法人日本鉄鋼協会の論文
1994-09-01