molten steel desulphurization method, secondary cast steel refining method, and molten steel production method

摘要

Patent Specification: "Cast Steel Desulfurization Method, Secondary Cast Steel Refining Method, and Cast Steel Production Method". At this point a method for the desulphurization of cast steel is provided, characterized in that a sample taken from the cast steel after puncture emptying from a converter or during secondary refining is quickly analyzed at high precision by means of a A method comprising a high frequency induction heating step wherein the sample is burned and oxidized under high frequency induction heating in a pure oxygen atmosphere to convert those in the sample to so2 and an analysis step wherein the gas containing so2 produced in the high frequency induction heating step is analyzed by an ultraviolet fluorescence method to quantify the s concentration of the sample, whereby the concentration s of molten steel after puncture emptying of the converter can be controlled. at a high accuracy to prevent insufficient concentration if and also the temp The desulphurization rate in the secondary refining may be shortened and the amount of desulphurizer or other employed may be reduced, and a method of producing molten steel by the use of such a method.