On the End Point Temperature and Carbon Control with Dropping Thermocouple and Carbon Detector in the Molten Bath of L. D. Converter during Blowing

Abstract

In order to improve the quality and to increase the production of steel ingot, it is essential to achieve the most accurate and the speediest control of end point temperature and C in L. D. converter. For this purpose homemade dropping thermoconple and carbon detector were tested 20 times atAmagasaki 30 t L.D. Furnace of Kobe Steel, and the results obtained were as follows:
(1) Using the computer and dropping the temperature and C detector into the moltenbath at 3 to 5 min before blow off, the deviation from aimed end point values can be restricted within ±10°C and ±0.01%C.
(2) Measuring the bath and its freeging temperature within 15 sec, bath carbon canbe presumed for very short time.
(3) The measuring accuracy is mainly decided by the blow hole and aluminum killingmethod in the sample, measuring time and position in the L.D. furnace and measuring technique of temperatures.
(4) Detector can be used repeatedly, so the actual cost of consumption can be minimized.
(5) Samples obtained in the detector can be used for analysis.