Molten steel desulfurization method, molten steel secondary refining method, and molten steel manufacturing method
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United States of America Patent
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May 14, 2019
Grant Date -
Apr 10, 2014
app pub date -
Aug 8, 2012
filing date -
Aug 12, 2011
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Abstract
A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert S in the sample into SO2 and an analyzing step wherein SO2-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify S concentration of the sample.
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