钢锭冷凝过程数学模型及应用

MATHEMATICAL MODEL ON SOLIDIFICATION OF INGOT AND ITS APPLICATION

本文建立了钢锭冷凝过程的二维数学模型，采用了修正温度回升，Ｃ－Ｎ辐射边界热流、分区时间步长等新方法，应用该模型对武钢Ｄ４８１３、Ｃ８８１２、Ｄ８９０８、Ｃ９２１３四种锭型钢锭的冷凝过程进行了计算，并用实测钢锭、钢锭模表面温度的方法进行了验证，计算值、实测值一致性良好。制定出了该四种锭型的＂钢锭传搁时间表＂，通过分析钢锭的传搁过程，首次提出了对先浇注钢锭的装炉温度进行修正的方法。另外，还成功地研究出了＂Ｃ８８１２钢锭微能加热工艺＂。四种锭型的＂钢锭传搁时间表＂和＂微能加热工艺＂全部纳入武钢技术操作规程，投入生产使用。

A two-dimensional mathematical midel on the solidification of ingot is set up and the solidification process of four different types of WISCO produced ingots, D48B, C8812, D8908 and C9213 is calculated by applying such a few new methods as adjustement on the ruturn of the temperature rise, the fhermal flow of C-N radiation boundary and the time-step length in differential area. Verification of the calculated values by the math model with the real temperatures measured from the surfaces of the physical ingots and moulds shows that they are in remarkable agreement with one another. A 'Thim Table for lngot transfer' of these 4 different types of ingots is alredady drawn out and method for adjustment on the charging temperature of the casting ingots initially put forward by analyzing the process of the ingot transfer, ln addition. proceduree for heating C8812 with minimun energy resource is successfully established. oth the 'Time Table for lngot Transfer' and 'procedure for Heating lngot with Minimum Energy Resource' have already been in corporated into the WISCO technical operation instruction and used in the practical production area.