Direct bonded magnesia chrome bricks use high purity sintered magnesia and chromium concentrate as main raw materials, manufactured by sintering at high temperature or ultra-high temperature. In order to form direct bonded, the SiO₂ content in raw materials is best to low, and that the sintering temperature must be raised to about 1700℃.

　　Direct bonded magnesia chrome bricks have the advantages of less impurities, lower porosity, high strength, strong abrasion resistance, high corrosion resistance, high thermal shock-resistance and flake resistance.

　　Direct bonded magnesia chrome bricks for RH vacuum degasser are mainly used as permanent linings in lower vessel and snorkel etc. Besides, direct bonded magnesia chrome bricks are also used for VOD furnace barrel.