Composed of imported chromite sand, refined quartz sea sand, and high refractory materials, it has the advantages of good fluidity, high specific gravity, fast speed, appropriate sintering layer degree, resistance to steel corrosion and penetration, and a self flowing pouring rate of over 98% for steel ladles. It greatly reduces the labor intensity of workers, reduces oxygen blowing and drainage, improves the quality of steel products, and ensures the smooth progress of continuous casting process.