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Abstract

A process for decarburizing a steel melt for the production of high-chromium steels by blowing in oxygen in which the decarburization rate is continuously measured and the amount of oxygen to be injected is adjusted depending on the measured values. The following controlled quantities are calculated: a) the duration of the Al--Si oxidation phase at the start of the decarburization process, b) the duration of a principle decarburization phase immediately following the Al--Si oxidation phase until the transition point from the decarburization reaction to the metal oxidation is reached, and c) the decarburization rate in the principal decarburization phase. The injected oxygen quantity is increased at an accelerated rate immediately following the Al--Si oxidation phase to the oxygen quantity of the principal decarburization phase until the decarburization rate calculated in c) is reached. The decarburization rate is maintained substantially constant for the duration of the principal decarburization phase by the injected quantity of oxygen. The injected oxygen quantity is continuously reduced immediately following the principal decarburization phase so that the decarburization rate decreases continuously in time at a predetermined time constant.

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