用板坯比直接用扁锭来轧制厚板具有很大优越性,但对于厚板产量不大的工厂专门设置一台板坯轧机是不经济的。近代连续铸钢技术的发展,使得有可能采用连续铸出的板坯来轧制厚板,这种生产方式是合理的,但由于目前尚未掌握某些特殊钢种和大型尺寸板坯的浇铸工艺,因此铸出的板坯不能完全满足厚板轧机对厚坯的要求,欧洲及美国发展的复合式板 The use of slabs is much more advantageous than rolling slabs directly with slabs, but it is uneconomical to set up a slab mill in a factory where slab production is low. The development of modern continuous casting technology makes it possible to roll slabs with continuously cast slabs, which is reasonable. However, due to the fact that some special steel grades and large size slabs have not yet been mastered , So the cast slab can not fully meet the thick slab mill requirements, the development of Europe and the United States composite panels