A  type: diameter: 60-200MM, length :3-10M,hardness :45-65 chemical elements: C: 0.52-0.7,    Si: 0.17-0.37,    Mn: 0.6-1.2,    S: <0.035,      P: <0.035,     Cr: <0.04B  type: diameter: 60-200MM, length :3-10M,hardness :45-65 chemical elements: C: 0.72-0.82,    Si: 0.17-0.37,    Mn: 0.7-0.8,    S: 0.035MAX,     P: 0.035,MAX     Cr: 0.28-0.60

grinding rod