熔炼炉用浇口砖的优化改造

Optimization and Transformation of Riser Brick for Smelting Furnace

实验室冶炼设备真空感应炉使用的钢锭模浇注浇口砖对钢锭质量影响较大。真空熔炼炉内的钢水经浇口砖倾倒入钢锭模,冷却后形成钢锭,流经浇口砖钢水的流速和角度、钢水中夹杂物、钢锭模内壁情况都会影响钢锭质量。文章针对浇口砖的结构进行优化设计,增加导流平台,一方面降低钢水对钢锭模内壁的冲刷力度,提高钢锭模使用寿命和钢锭表面质量;另一方面增加钢水在浇口砖内的停留时间,使得钢水内部的夹杂物上浮去除,提高钢锭内部质量。实践证明,优化改造后的浇口砖设计合理,应用效果较好。

The effects of riser brick for casting ingot mould used in the smelting equipment of laboratory,vacuum induction furnace on quality of steel ingot are greater.The molten steel in vacuum melting furnace is poured into ingot mould through riser brick and steel ingot is formed after cooling.The flow velocity and angle of the molten steel flowing through riser brick,inclusions in molten steel and inner wall of ingot mould all affect quality of steel ingot.In the paper,the optimization design for structure of riser brick is introduced,which is to add a diversion platform.On the one hand,the scouring force of molten steel to inner wall of ingot mould is reduced so that the service life of ingot mould and surface quality of steel ingot are improved;on the other hand,the retention time of molten steel in riser brick is increased so that the inclusions in molten steel float to be removed and internal quality of steel ingot is improved.The practices prove that the design of riser brick with optimization and transformation is reasonable as well as application effects are good.