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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.2 (1970) No.3 ■■■■■■■■■■■■■■■■■■■ |
| 実用鋼塊内の成分偏析低減に関する研究 Studies on the Reductions of Solute Segregation in Steel Ingots 中西 恭二(Kyoji Nakanishi) |
| 要旨 : 鋳鉄鋳型で造塊される実用鋼塊内の成分偏析を低減する方法について検討した。まず任意諸元の鋳型に対する最適押湯比の推定方法について検討し，押湯形式が発熱，断熱方式のそれぞれについて信頼できる推定式を得た。つぎに偏析低減に有効といわれるスクレイプ法を検討したところ鋳鉄鋳型を用いる限り，本法は有効な偏析低減法にはなり得ないという結論を得た。最後に鋳型−鋼塊間に生成する空隙内に直接冷却剤を送り込む強制冷却法を考案し，本法が鋼塊内の成分偏析低減に関して著しく効果のあることを示した。 |
| Synopsis : Casting methods were investigated in order to reduce the solute segregation in steel ingots cast into iron molds. First, a method for estimating optimum hot top ratio for a given mold was studied, and reliable equations were given for exothermic hot top ratios and thermo-insulating hot top ratios, respectively. As a result of some experiments in practical scale conducted to investigate the scraping method which had been reported to be useful for reducing the segregation in steel ingots, the author came to the conclusion that the scraping method could not be effective for reducing segregation without suppressing the horizontal solidification from the mold wall. Lastly, a new method was devised, in which some coolant such as air or water was introduced directly into the air-gap in order to increase the solidifying rate of steel ingot effectively. The experimental results show that solute segregations were remarkably reduced by this method. |
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