| 摘要 |
PURPOSE:To easily produce high Mn steel while preventing combustion loss of Mn by supplying carbonic material quantity counterbalanced to decarbonizing quantity at the time of oxygen blowing molten iron in a top and bottom blowing reaction vessel and decarbonized-refining by supplying the prescribed quantity of Mn while supplying the carbonic material. CONSTITUTION:The molten iron is charged into the top and bottom blowing reaction vessel and the carbonic material quantity counter-balanced or more to the decarbonizing quantity caused by oxygen blowing, is supplied into the molten iron while executing oxygen-blowing. during or after supplying the carbonic material, the prescribed quantity of Mn is supplied to adjust the high temp. molten iron and next, decarbonized refining is executed to the prescribed carbon concn. Then, as Mn source adding into the molten iron, middle carbon or low carbon ferro-manganese, etc., besides high carbon ferro-manganese is used. In this way, the supplied carbonic material is burnt by the oxygen blowing to five heat to the bath, and a part of heat is utilized to raise the temp. and also the remaining part is utilized to compensate endothermic in melting Mn, and the high Mn steel is easily produced at low cost.
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