薄板坯单流中间包混浇水力学模型试验研究

Research on continuous casting grades transition process by hydraulic model of CSP 45 t single strand tundish

针对武汉钢铁有限公司CSP高品质钢品种多、批量小、生产组织复杂、连铸成本高的难题,采用水力模型方法对CSP 45 t单流连铸中间包异钢种混浇进行了研究,模型与实物比例为1︰2,试验满足弗劳德准数相似。分析了不同拉速和中间包余钢量条件下,铸坯长度方向上浓度曲线的变化,提出了较优组合方案,并进行了现场试验。试验结果表明:在中包剩余钢水量10 t、拉速4.5 m/min时,混浇坯长度最短,为22.40 m,其结果与现场试验结果相符。项目技术应用后,缓解了高品质钢多品种、小批量生产组织复杂的难题,提高了薄板坯连铸高品质钢的生产效率,降低了制造成本。

Aimed at the problem of complicated production organization and high cost of continuous casting,which is due to multi-product and small batch of high performance steels in CSP plant of Wuhan Iron and Steel Co.,Ltd. Length of the transition slab during the CSP casting was investigated by hydraulic modelling and pilot trials. The used water model was in a proportion of 1 ∶ 2 to simulate the industrial tundish with a capacity of 45 t. During the simulation,the conditions satisfied the Froude number similarity principle. Important factors which affect the flow and mixing of liquid steel were taken into account,including the casting speed and the weight of residual molten steel in tundish. As a result,concentration curves along the casting direction were analyzed and obtained. It was found that the minimum length of the intermixing slab was about 22. 4 m when the residual molten steel and casting speed were about 10 t and4. 5 m/min,respectively. Hereafter,industrial trials were carried out,which agreed with the obtained results in the cold model simulation. After application,the problem of complicated production organization,which is due to multi-product and small batch of high,was be relieved. Productivity of high performance steels was increased and the cost was effectively reduced in CSP plant.