Mechanical Properties Volues Hardness of roll surface HSD65-85 Hardness of roll neck HSD35-48 Tensile strength of core ≥400MPa Chemical composition% C Si Mn Cr Ni Mo 2.4～2.8 0.4～0.6 0.8～1.2 14.0～22.0 0.8～1.5 0.2～0.8