... slag ,sand,and concrete,etc. Abrasion resistant pipe steel-corundum ceramic composite pipe to convey pulvarized coal and fly ash and so ... part of is highly wear- resistant and anti-crrosion corundum ceramic (a-Al2O3 ).Mohsscale of hardness of inner layer is around ... , T, Y, reducer and so on. abrasion (erosion)resistant steel-ceramic composite pipe