In slab continuous caster, when slabs of different widths are to be produced, casting has to be stopped in order to change the mold width to the required size. The technique to solve such problem is a variable width mold, which changes the mold width during casting. Nippon steel developed the high speed variable width mold "NS-VWM" which permits a shift mold width changing speed to higher speed with a combination of changes of a narrow face taper and parallel movement. In this paper, the features and effects of this equipment are outlined.
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