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 Ni Cr Mo 1.2～2.2 0.34～0.6 0.7～1.1 ≥0.3 0.8～1.2 0.2～0.6