METHOD FOR ESTIMATING MOLTEN STEEL TEMPERATURE AND CARBON CONCENTRATION AT BLOWING TIME IN CONVERTER, AND BLOWING METHOD IN CONVERTER

摘要

PROBLEM TO BE SOLVED: To simply estimate molten steel temp. at end point and carbon concn. at end stage of blowing in a converter in high accuracy. SOLUTION: The molten steel temp. and the carbon concn. in an optional target temp.-carbon concn. range are estimated by using the measured values of the molten steel temp. and the carbon concn. during blowing, and a decarburizing speed constant, decarburizing speed transition carbon concn. and decarburizing limited carbon concn. estimated from the operating conditions. Based on these estimated values, a molten steel tapping target temp. and carbon concn. at the completing time of blowing, are automatically corrected under consideration of the temp. dropping rate at the molten steel tapping time in the converter. Oxygen blowing quantity and cold material additional quantity till completing the blowing or kind of alloys and charging quantity thereof added at the molten steel tapping time, are indicated so as to become the min. cost.