Centrifugal composite high-nickel-niobium wear-resisting cast iron roll and casting method thereof

Abstract

The invention relates to the field of cast iron rolls, in particular to a centrifugal composite high-nickel-niobium wear-resisting cast iron roll and a casting method thereof. The centrifugal composite high-nickel-niobium wear-resisting cast iron roll comprises a working layer and a core layer, and is characterized in that the working layer is composed of the following chemical components by weight percentage: 2.9-3.6% of C, 0.6-1.5% of Si, 0.4-1.2% of Mn, less than 0.10% of P, less than 0.05% of S, 3.01-4.8% of Ni, 1.0-2.0% of Cr, 0.2-2.0 % of Mo, 0.1-2.0% of Nb, 1.0-4.0% of V, 0.05-2.0% of W, and the balance of Fe. Compared with the prior art, the invention has the benefits that bulk wear-resisting particles are distributed in a dispersing way and embedded in a roll metal matrix in dot and bulk shapes, and graphite exists in a dot shape; the wear-resisting particles are distributed in a dispersing way and are firm and not easy to fall off by being embedded into the matrix, so that the whole wear-resisting performance of the matrix structure of the roll is greatly prompted; and wear of the whole roll surface of the roll is uniform.

Description

technical field [0001] The invention relates to the field of casting methods of cast iron rolls, in particular to a centrifugal composite high-nickel-niobium wear-resistant cast iron roll and a casting method thereof. Background technique [0002] The current ICDP (high-nickel-chromium infinitely chilled cast iron work rolls) rolls are commonly used in hot strip mills, and the rolls mainly have the defect that they are not wear-resistant as a whole. Graphite in the matrix structure of the roll is a low-strength phase. Under the action of rolling load, it is easy to fall off and form small pits. The embedding of the rolled steel oxide scale can easily cause cracks around the pits, resulting in roughness of the roll surface, but the matrix structure of the roll The presence of medium graphite is beneficial to smooth rolling and heat conduction. Due to the existence of coarse graphite in the matrix structure of the roll, graphite peeling is prone to occur during the rolling pr...

AI Technical Summary

Problems solved by technology

Due to the existence of coarse graphite in the matrix structure of the roll, graphite peeling is prone to occur during the rolling process, which will cause the roll surface to be rough prematurely. When the roll is repaired, the machining allowance is large, which will inevitably lead to a low comprehensive mm rolled material volume of the roll.

In order to improve the overall wear resistance of the roll, V and W alloy elements are appropriately added to the working layer of the ICDP roll at present, but the density of VC is lower than that of molten iron, and the density of WC is higher than that of molten iron. Segregation of structural components is easy to occur, which greatly affects the further improvement of the overall wear resistance of the roll

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