| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous measurement method of molten steel temperature using immersion type temperature sensor which stably and repeatedly measures the molten steel temperature in refining process, and a control method of the molten steel temperature using this measurement method. SOLUTION: This is the measurement method of the molten steel temperature used in refining of molten steel, characterized so that both a protective tube having refractory layers arranged on inner/outer periphery surfaces of its tubular cored bar and the temperature sensor arranged inside the above protective tube are immersed in the molten steel, with the molten steel left exposed inside the above protective tube, and immersion depth h of the above temperature sensor into the molten steel is made larger than immersion depth H of the above protective tube into the molten steel to continuously measure the molten steel temperature for three minutes or more. This method is used to continuously measure the molten steel temperature under secondary refining, controlling amount of oxygen supplied to the molten steel based on both difference between the above measured temperature and target temperature and heating-up efficiency held as database. COPYRIGHT: (C)2010,JPO&INPIT
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