1990 年 76 巻 11 号 p. 1972-1977
The accurate estimation method of the end-point composition of the steel in BOF is indispensable to the quick tapping operation of the converter. The two estimation methods were studied in Kobe Steel. One is so-called the [O]F method which is based on the free-oxygen content of the steel at the blow-end-point. The other is so-callled a QV method which is based on the spectroscopic analysis data of the steel sample obtained by the sublance in the blowing period.
The results of the study are as follows.
1) As the [O]F method is based on material balance and the slag-metal equilibrium, the accuracy of the method is not sufficient and the method is not applicable to high carbon steel.
2) The QV method supplements the weak points of  F method. The accuracy of the QV method is so high that it has been applied to the highest specifications of the steel. In addition, the method is applicable to high carbon steel.