4流大方坯45 t中间包流场的物理模拟和冶金效果

通过几何相似比1:3的水模型对钢厂4流410 mm × 530 mm大方坯连铸机的不同结构的40～50t中间包进行流场、温度场以及流动特征的研究,并得出最佳控流装置。研究结果表明,为满足4流大方坯中间包对流场的要求,有通道式感应加热装置的中间包与无通道式感应加热装置的中间包优化出的最佳控流装置不同。对于无通道式感应加热装置的中间包,采用最佳方案(湍流控制器+带导流孔的"V"型挡渣墙+挡坝组合的控流方式),延长了近流水口响应时间及平均停留时间,各水口钢液的流动模式趋于一致,中间包内钢液的流动特征得到明显改善。生产40Cr钢实践表明,可连浇8炉,各水口最大温差为4℃,中间包钢液中T[O]约为10×10^-6。

Physical Simulation of Liquid Flow Field in 45 t Tundish for Four Strand Bloom and Its Metallurgical Effect

A study on liquid flow field,temperature field and flow characteristics in a 40 50 t tundish with different structure for 4-strand 410 mm×530 mm bloom caster at steel works has been carried out by using geometric similarity 1:3 water model to get optimum flow control devices.Research results show that in order to meet the requirement of flow field in tundish for 4-strand bloom,the optimized best flow control device for the tundish with channel type induction heating unit is different from that for the tundish without channel type induction heating unit.For the tundish without channel type induction heating unit,by using the optimum scheme i.e.the combined flow control method of turbulent flow control device + " V" tvpe retaining wall with deflector hole + dam,the response time and average residence time of the flow closer to nozzle are prolonged,the flow pattern of each nozzle is consistent,the liquid flow characteristics in tundish are obviously improved. The practice in production of steel 40Cr shows that continuous casting heats are up to 8 heat,extreme temperature different between each strand decreases to 4℃and T[O]in liquid in tundish is about 10×10^-6.