... %,ak≥35J/mm23.Gray Cast Iron Pipe/bar(ISO:150/200/250/300/350) ---Matrix: ferrite+pearlite ---σb=150 ... industries,such as railway vehicle, oil machine,engineering machine,auto parts,compressor, hydraulic and pneumatics,chemical pump, machine tool ... bridge plug, suction vitta Railway vehicle bogie bush, braking system bushing Metallurgical equipmentcasting lift tube ,suction tube, thermocouple protect ...