【连】 变钢种操作(In the grade change operation, the tundish containing the old grade of steel being cast is first emptied to a certain depth before pouring the new grade from the ladle. 变钢种操作时，在由钢包浇人下一炉异钢种钢水前，首先将盛有上一炉正在浇注钢种钢水的中间包排空到一定深度。)
变钢种过程(Therefore, it is desirable to develop a simpler and faster means of analyzing the grade change process. With this aim in mind, a simple tanks-in-series model has been developed to account for the grade change process. 因此，人们迫切需要开发一种简洁、快速的分析变钢种过程的方法。基于这一目标，现已开发出一种简易的系列槽模型用于说明变钢种过程。)
