wear resisting pipe of conveying pulvarised coal ,fly ash,mine dust,metallurgy slag ,sand,and concrete,etc. steel-corundum ceramic composite pipe to ... .The out part of the pipe is steel and inner part of is highly wear- resistant and anti-crrosion corundum ceramic (a-Al2O3 ... pipe, but also elbow, T, Y, reducer and so on. abrasion (erosion)resistant steel pipe