| 摘要 |
PURPOSE: Provided is an ore input tube of introducing the ore into the interior of the furnace. The tube is made with increased contents of Cr and Ni and fabricated by centrifugal casting so that the life of the tube is extended. CONSTITUTION: The preparation method comprises: a melting step(10) of metals, consisting 0.5% of C, 2% of Si, 2% of Mn, 0.04% of P, 0.04% of S, 30-26% of Cr, 4.5% of Ni, 0.5% of Mo and 61.4% of Fe, in the microwave induced melting vessel; a centrifugal casting step(20) wherein the above melt ore is put inside of a horizontal mold of the horizontal centrifugal casting machine; a detaching step(30) of the above hardened cast from the horizontal mold of the horizontal centrifugal casting machine; a polishing step(40) of the above separated cast by spraying water containing sands with the force of compressed air; and a cutting step(50) of the both ends of the above polished cast.
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