| 摘要 |
<p>An abrasion-resistant composite roll and a process for its production are disclosed. The roll comprises an outer layer composed of an iron-based allow containing at least one carbide of W, V, Nb, Ti, Ta, Zr and Hf crystallized from molten metal in the solidifying step and a steel shaft metallically bound to the outer layer. The outer layer has a surface hardness of 70 or more in Shore hardness while the shaft has a tensile strength and an elongation of 55 kg/mm2 or more and 1.0 % or more, respectively, and the bonding strength of the interfacial portion between the outer layer and the shaft is stronger than that of the outer layer or the shaft, whichever is weaker. The iron-based alloy comprises, by weight, 1.5 to 3.5 % of C, 0.3 to 3.0 % of Si, 0.3 to 1.5 % of Mn, 2 to 7 % of Cr, up to 9 % of Mo, up to 20 % of W, and 3 to 15 % of V, the balance being substantially Fe.</p> |
