40-70# 50-100# Chromite Sand for Foundry Factory Graphite Iron
40-70# 50-100# Chromite Sand for Foundry Factory Graphite Iron Chromite sand ,it’s main chemical composition is Cr2O3(chromic oxide), This kind of sand heating volume is stable , High thermal conductivity , sand molten metal contact , not only has a good alkali slag resistance , not with iron oxide and other chemical reaction , and