射钉法在铸坯凝固终点预报模型中的应用

Application of nail-shooting technique in forecasting model of slab solidification end point

为了精确掌握连铸机的综合冷却特性,验证铸机模型计算的准确性,进而为优化二次冷却制度提供依据,采用射钉法分别对新钢3号特厚板连铸机中碳钢和高碳钢进行了射钉试验,测量出典型工况条件下矫直区前后位置处铸坯凝固坯壳厚度,并以测得的凝壳厚度为边界模拟预报出凝固终点的位置。从模型计算预报的结果来看,中碳钢在典型工况条件下凝固终点的位置距离弯月面的距离为33.7m,而高碳钢在典型工况条件下凝固终点的位置距离弯月面的距离为27.6m。射钉试验与凝固模拟相结合预报的凝固末端为末端大压下位置设定提供了理论依据。

In order to master the comprehensive cooling characteristics of casting machine,verify the accuracy of calculation of caster model and provides the basis for the optimization of the secondary cooling system,nail-shooting experiment was carried out on medium carbon steel and high carbon steel of No.3super-thick slab caster in Xinsteel.By the experiment,the solidified shell thickness near straightening area was accurately measured under certain working conditions,which was used as the boundary conditions to simulation the position of solidification end point.The numerical simulation results showed that the distances from meniscus to final stage of solidification on the conditions of medium carbon steel production and high carbon steel production were about 33.7mand 27.6m,respectively.The nail-shooting experiment combined with the solidification simulation can provide the theoretical basis for the process of dynamic soft reduction of slab caster.