球墨铸钢轧辊的轧制寿命比70Mn轧辊提高1—2倍,但其含碳和含矽量高(C1.3—1.5％;Si1.3—1.6％),体积收缩较低碳钢大得多,很容易产生缩孔,其缩孔缺陷要占整个废品的60—70％,影响了新钢种的发展。采用上海耐火材料研制绝热保温帽浇注,取得以下效果:1.绝热帽比普通帽处的钢水温度平均提高60℃—100℃,形成了一个理想的上补下顺序凝固条件,可消除缩孔缺 Ductile cast steel roll life than the 70Mn roller 1-2 times, but its carbon and silicon content is high (C1.3-1.5%; Si1.3-1.6%), volume shrinkage is lower than the carbon steel More, it is easy to produce shrinkage, shrinkage defects account for 60-70% of the entire waste, affecting the development of new types of steel. Adopting Shanghai refractories to produce adiabatic cap, the following results are obtained: 1. The average temperature of the molten steel in the adiabatic cap is increased by 60 ℃ -100 ℃ on average, forming an ideal solidification condition for up-down order, which can eliminate the shrinkage hole