old grade of steel being cast(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。)
sequence casting of unlike grades(How to minimize intermixed region is still a major problem for sequence casting of unlike grades. 如何将混钢区减少到最小仍然是异钢种多炉连浇的一个主要难题。)
sequentially casting mixed grades(This paper presents some of the considerations, practices and results that are associated with sequentially casting mixed grades. 本文介绍了一些与异钢种多炉连浇相关的研究、实践和结果。)
unlike grade casting(Unlike grade casting may be performed by one of two methods: either a "flying" tundish change, together with a grade separator plate, or a lowered tundish practice and grade separator plate may be used. 异钢种多炉连浇可以采用以下两种方法中的一种进行：采用飞包同时使用钢种隔离板的方法，或者采用降低中间包液位和使用钢种隔离板的方法。)
