... Density,Zero Defects 4.ductile iron piston ring I.Intro:Based on horizontal continuous casting for cast iron profile(dense bar), ... machine,engineering machine,auto parts,compressor, hydraulic and pneumatics,chemical pump, machine tool,metallurgical equipment etc.Meantime, we also supply ... related products in blank, such as cylinder liner,piston ring,ADI bushing,sealing ring,suction pipe etc. By ...