| 摘要 |
A lance structure for oxygen refining of molten ferrous metal comprising three concentric metallic tubes extending through a side wall of a reaction vessel and terminating in a common discharge plane beneath the molten metal surface adjacent the side wall, the innermost tube conducting an oxygen-containing gas, the annular space between the innermost and second tube conducting a shroud gas, a pair of parallel auxiliary cooling pipes in another annular space between the second tube and the outermost tube for conducting cooling gas, the pipes being on opposite sides of the second tube in the 3 o'clock and 9 o'clock positions, and refractory material encasing the pipes and occupying the other annular space, the pipes being sufficiently remote from the second tube that cooling gas discharged therefrom does not intermingle with the oxygen. A method of oxygen refining molten steel is disclosed utilizing such a lance structure.
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