含マンガン極低炭素鋼の溶製方法

Ingot method for manganese-containing ultra-low carbon steel

Abstract

PROBLEM TO BE SOLVED: To provide an ingot method for manganese-containing ultra-low carbon steel capable of reducing the amount of use of metal Mn from a conventional method, and executing the processing in a vacuum degassing apparatus with the scheduled casting start time.SOLUTION: The ingot method for manganese-containing ultra-low carbon steel, in which the target Mn concentration is 0.3-3.0 mass%, is improved as follows: the scheduled casting start time of this time's charge is determined by predicting the time, at which the continuous casting of a previous charge is ended, by the casting rate; the allowance time from the present time to the scheduled casting start time is calculated when starting the vacuum degassing processing; the decarburization processing-possible time is obtained by subtracting the required time for killed processing in the vacuum degassing processing, the required conveying time of molten steel to continuous casting facilities after the vacuum degassing processing is completed, and the casting preparation time from the allowance time; the charging amount of Fe-Mn alloy to be added into molten steel is determined before starting the processing so that the decarburization processing can be executed within the decarburization processing-possible time; and the difference, between the expected Mn concentration in the molten steel after charging the Fe-Mn alloy and the target Mn concentration of a steel product, is adjusted by adding metal Mn in the molten steel during the killed processing.
【課題】 本発明は、金属Mnの使用量を従来より低減し、且つ真空脱ガス装置内での処理を鋳造開始予定時間内で行うことの可能な含マンガン極低炭素鋼の溶製方法を提供することを目的としている。 【解決手段】 目標Mn濃度が0.3〜3.0質量%である含マンガン極低炭素鋼の溶製方法を改良した。その内容は、前チャージの連続鋳造が終了する時間を鋳造速度で予測して今回チャージの鋳造開始予定時刻を定めると共に、真空脱ガス処理開始時に、現時点から前記鋳造開始予定時刻までの余裕時間を算出し、該余裕時間から、真空脱ガス処理におけるキルド処理所要時間、真空脱ガス処理終了から連続鋳造設備への溶鋼の搬送所要時間及び鋳造準備時間を差し引いた時間を脱炭処理可能時間とし、該脱炭処理可能時間内に脱炭処理が可能となるように、処理開始前に溶鋼中に添加するFe−Mn合金の投入量を決定し、投入後の溶鋼中の予想Mn濃度と製品鋼材の目標Mn濃度との差分を前記キルド処理時に溶鋼中に金属Mnを添加して調整するものである。 【選択図】 図1

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