Method for producing low nitrogen-containing chromium molten steel

摘要

PPROBLEM TO BE SOLVED: To provide a method for producing molten low nitrogen and chromium-containing steel by which molten low nitrogen and high purity chromium-containing steel is provided by reducing a degassing treatment in a reduced-pressure secondary decarburization-refining process and the shortening of a treating time in a reduced-pressure secondary decarburization-refining furnace, the reduction of a refractory cost, etc., can be obtained. PSOLUTION: A reduction-treatment of chromium oxide in slag is applied by dividedly adding COSB2/SBgenerating material 13 after adding a reduced agent into the molten chromium-containing steel performing the decarburization- refining in a converter 1. Successively, the reduced-pressure secondary decarburization-refining is applied after tapping off the chromium-containing steel 8 performing the reduction treatment in a ladle 12 charging the COSB2/SBgenerating material 13. PCOPYRIGHT: (C)2004,JPO