... /250/300/350) ---Matrix: ferrite+pearlite ---σb=250-380 Mpa, HB=150-240, E=1.1-1.7*105Mpa4. Alloy Gray ... bushing Metallurgical equipmentcasting lift tube ,suction tube, thermocouple protect tube Air-condition compression machinerolling piston ring Automotivedry cylinder liner, piston ring, steering ... , steering pump stator, gear Mine mechinanismwear resist sleeve, engine cylinder Air Compressor Liner