... 1. Brown corundum is of good hardness, high strength& corrosion resistance. 2. From raw bauxite 3 .Honest service Zibo JUNXU ... ) As there is high temperature, corrosion resistance, high strength properties, it poured with steel sliding gate, smelting rare ... plugs, heat-resistant anti-oxidation coating.(2) Due to high hardness, wear resistance, high strength characteristics, in the chemical system, used ...