Cast basalt lined lateral is composed of steel pipe tee, cast basalt pipe and cement mortar concrete. Cast basalt lined lateral is used too many industrial areas where the abrasive, chemical
and hot materials transported and which are commonly lined steel elbows. At the same time cement mortar is selected as the filling material and this can make the inside surface of steel pipe in
alkali mediums. So the surface of steel pipe generates purifying films these films can prevent being rusted.