... for cast iron profile(dense bar),we've developed new casting tech ‘physics force field confinement and shaping ... casting’ in 2006, by using this tech we manufactured new kind of cast iron profiles ---Cast Iron Hollow Bar ... Automotivedry cylinder liner, piston ring, steering pump stator, gear Tractorshippingdry cylinder liner, piston ring, steering pump stator, gear Mine mechinanismwear resist sleeve ...