Study and Production of Automobile Brake Drum with Improved Properties
Through analyzing the specimen of the failure automotive brake drums, it was found that the brake drums of common cast iron had frequently serious wear or thermal fatigue crack, which could not satisfy today's automotive requirements in high load and high speed. By virtue of the high thermal conductivity of graphite, the high-carbon cast iron has better thermal fatigue resistance, but increasing the graphite reduces the strength. Therefore, adding Cr, Mo, Cu, Sn in high-carbon gray iron, a balance is obtained between strength and thermal fatigue resistance. The service life of automobile brake drum can largely prolong.