... vehicle, oil machine,engineering machine,auto parts,compressor, hydraulic pressure,chemical pump, machine tool,metallurgical equipment etc. ... protect tube Air-condition compression machinerolling piston ring Automotivedry cylinder liner, piston ring, steering pump stator, gear Tractorshippingdry ... than the grades 1-2. F:For gray cast iron and gray iron alloy materials, we can get uniform structure ...