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