Abstract
Some improvements for making ultra low carbon steel have been obtained since AF-LF duplex refining process coupled with vacuum degassing was induced in Hoshizaki plant, Daido Steel Co., Ltd.Main points of the improvements are as follow;(1) Carbon pick-ups during LF processings are eliminated by the choice of low carbon bricks, the application of long arc heating and the usage of low carbon alloys.(2) Decarburization reaction is controlled by the αFeO. In order to reach the minimum carbon level, αFeO must be kept as higher as possible.
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