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针对梅钢2号铸机板坯的气孔缺陷问题,采用水力学物理模拟的方法,研究了拉速、水口插入深度和吹气量对结晶器内气泡分布的影响。根据物理模拟结果对吹气量进行了优化,得到了吹氩量与结晶器通钢量的定量关系式,并在大生产中进行了应用。结果表明,将实际中的吹氩量控制在优化的吹气量范围之内时,硫印评级方法检测的针孔状气孔缺陷等级从1.0级降为0.5级,缺陷铸坯比例降幅达12.7%,低倍检验缺陷铸坯比例降幅达61.8%。
Aiming at the problem of porosity defects in the slab of No.2 caster in Meishan Iron and Steel Co., Ltd., the effects of casting speed, nozzle insertion depth and blow volume on bubble distribution in the mold were studied by means of hydraulic physics simulation. According to the result of physical simulation, the air blowing quantity is optimized, and the quantitative relation between the amount of argon blowing and the amount of steel passing through the mold is obtained and applied in large production. The results show that when the amount of argon in practice is controlled within the optimized blowing capacity, the pinhole porosity defects detected by the S & P rating method drop from 1.0 to 0.5, and the proportion of defective slabs decreases by 12.7% The ratio of defects in low inspection defects decreased by 61.8%.