METHOD FOR DECREASING OF HYDROGEN CONCENTRATION ON RH PROCESS

摘要

PURPOSE: A method for reducing hydrogen concentration in an RH process is provided to produce molten steel with low hydrogen by improving dehydrogenation efficiency. CONSTITUTION: A method for reducing hydrogen concentration in an RH process is as follows. Molten steel is re-circulated in a ladle and a vacuum vessel by controlling the internal pressure of the vacuum vessel of degassing equipment to a set vacuum degree(S10). When the internal pressure of the vacuum vessel reaches the set vacuum degree, a top lance is descended and is located at the top of the molten steel in the vacuum vessel(S20). Gas is jetted to the top surface of the molten steel through the descended top lance to dehydrogenate the molten steel(S30). [Reference numerals] (AA) Start; (BB) End; (S10) Re-circulating molten steel by adjusting the internal pressure of a vacuum vessel of re-circulating type degassing equipment to a set vacuum degree; (S20) Locating a top lance at the top of the molten steel in the upper part of the vacuum vessel; (S30) Jetting gas to the top surface of the molten steel through the top lance