Rapid measurement method and device for trace carbon in molten steel

摘要

PURPOSE:To provide a method and an apparatus which can measure the concentration of trace carbon in a molten steel of which direct measurement has been impossible in the conventional art quickly and very precisely. CONSTITUTION:The blowing or recovering of a carrier gas containing carbon monoxide and carbon dioxide is performed once or a plurality of times while making the carrier gas pass or circulate through a gas circulation circuit A2 provided with an oxidation carbon concentration measuring means 16 in the course thereof to increase the concentrations of carbon monoxide and carbon dioxide gradually so that the values thereof approaches a value to achieve a balance between the concentrations of carbon and oxygen in a molten steel. When a specified frequency of circulation is reached or a specified time passes, the concentrations of carbon monoxide and carbon dioxide in the carrier gas are measured by the oxidation carbon concentration measuring means. Then, the concentration of carbon in the molten steel is estimated from a mutual relationship between the concentrations of the carbon monoxide and carbon dioxide and the concentration of oxygen in the molten steel.