| 摘要 |
The invention relates to a process for decarbonising a steel melt for the production of high-chromium steels with blown oxygen, in which the decarbonisation rate is continuously measured and adjusted in accordance with the measured values of the oxygen to be blown in, in which the following control values are calculated: a) the duration of the Al-Si oxidation phase at the start of the decarbonisation process; b) the duration of the main decarbonisation phase immediately following the Al-Si oxidation phase as far as the transition point from the decarbonisation reaction to metal oxidation; and c) the decarbonisation rate in the main decarbonisation phase; and in which the quantity of oxygen blown in is increased at an accelerated rate to the quantity of oxygen in the main decarbonisation phase until the decarbonisation rate as per c) is reached, the decarbonisation rate is kept substantially constant during the main decarbonisation phase by the quantity of oxygen blown in and immediately after the main decarbonisation phase the quantity of oxygen blown in is continuously reduced in such a way that the decarbonisation rate is reduced gradually in time at a predetermined time constant.
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