保温冒口是苏联的先进经验,它是在冒口外面装上一个用特殊材料制成的导热性低的套简——保温套,降低冒口钢水的凝固速度。运用这个先进经验可以缩小冒口体积,因而节省大量液体金属及切割冒口的氧气。在某些特厚的铸件上采用保温冒口,可以充分补给铸件的收缩,防止产生缩孔,提高产品合格率。我们学习了这个先 Insulating riser is the Soviet advanced experience, it is installed outside the riser with a special material made of low thermal conductivity of the sleeve - insulation sleeve, reducing riser molten steel solidification speed. With this advanced experience, the riser volume can be reduced, thus saving a great deal of liquid metal and cutting riser oxygen. Insulation in some of the thick castings used riser, casting can fully supply the shrinkage, to prevent shrinkage, improve product yield. We learned this first