... DIAMETER:60--200MM,LENGTH:3-6M,HARDNESS:HRC45-60 TYPE B: DIAMETER:60-150MM,LENGTH:3-6M,HARDNESS: HRC45 ... bar. The grinding steel bar series have A type and B type. The grinding steel bar series are mainly used ... ore and coal etc.Detailed introduction is as follows:A type: diameter: 60-200MM, length :3-10M,hardness : ... <0.035, P: <0.035, Cr: <0.04B type: diameter: 60-200MM, length :3-10M,hardness :45-65 ...