... the casting pipe must be grinded on the finishing line. The uneven floating residues and oxidized iron sheets, etc in the internal ... and chamfering at the spigot of the pipes. The finishing line equipment includes rounding machine, the internal wall grinding machine, the ... ,DN800(600)-1200mmx5500-6000mm.The hot mold ductile casting pipe line can be divided into categories of DN800-1600mm,DN1200-2200mm ...