| 摘要 |
PURPOSE:To prevent the generation of any cracking defect in an ingot in the stage of cooling a continuous casting mold for steel with liquid alkali metal by specifying the temp. of the liquid metal flowing out from the casting mold. CONSTITUTION:A NaK alloy (about 56% Na, about 44% K) is used as liquid alkali metal, and is introduced through a heat exchanger 5, a tank 4, a pump 3, a filter 2 and a flowmeter 6 into a casting mold 1 to cool the mold, whereafter the metal is circulated again to the heat exchanger 5. Cold water or hot water is supplied by a circulation pump 11 to the water side of the heat exchanger 5 to control the temp. of the liquid metal. The temp. of the liquid alkali metal flowing out through the outlet of the mold 1 is controlled by such cooling mechanism so that said temp. is kept always in a specified range of <=330 deg.C, and particularly in the case of the liquid metal in upward current to<=250 deg.C. The generation of any defect such as breakout in the ingot is thus prevented. |
