Hitachi KH180-3 Track Roller Crawler Crane
The material of track roller is 50Mn,42CrMo,the main process is casting or forging ,machining, heat-treated. After quenching of wheel surface ,The hardness require up to HRC 52-58 to strengthen the wear resistance of wheel surface. The shaft for track roller has high accuracy， the material of shaft is 50Mn or 40Mn2. Then the the shaft also need quenching , the surface hardness require up to HRC48-53.