High-chromium alloy iron roll and preparation method thereof

Abstract

The invention provides a high-chromium alloy iron roll and a preparation method thereof. The roll is composed of a high-chromium alloy cast iron work layer and a nodular cast iron roll core. The work layer comprises the elements of, by mass percentage, 2.6-2.8% of C, 0.5-0.9% of Si, 0.3-0.8% of Mn, 20-22% of Cr, 0.6-1.5% of Ni, 0.2-0.3% of Mo, 0.2-0.4% of Cu, 0.001-0.003% of B, 0.1-0.6% of V, 0.01-0.03% of RE, less than 0.05% of P, less than 0.05% of S and the balance iron. The work layer and the roll core are compounded in a centrifugal machine casting mode, and the high-chromium alloy iron roll is prepared through sub-critical heat treatment. The high-chromium alloy iron roll has good abrasion resistance, tenacity and heat crack resistance, the service life of the roll is prolonged, the heat treatment temperature is low, and energy saving and environment protection are achieved.

Description

technical field [0001] The invention relates to a roll, in particular to a high-chromium alloy cast iron roll and a preparation method thereof, belonging to the technical field of roll manufacturing. Background technique [0002] Roll is the main consumable spare part in steel rolling production. Its quality directly affects the surface quality of rolled material and the production cost of rolled material. Improving roll quality and reducing roll cost have always been the focus of roll manufacturers. At present, the commonly used roll materials are high-nickel-chromium infinitely chilled cast iron, semi-steel, high-chromium white cast iron and high-carbon high-speed steel. High-nickel-chromium infinitely chilled cast iron rolls are brittle, and semi-steel rolls have low hardness and poor wear resistance. Although high-carbon high-speed steel has high hardness and good wear resistance, it needs to add more iron alloys such as tungsten, molybdenum, vanadium, and niobium. Caus...

AI Technical Summary

Problems solved by technology

However, the high-chromium alloy cast iron rolls of the prior art also have the following deficiencies: first, the thermal crack resistance is poor, and the roll body is prone to cracks and peeling off, which affects the service life of the roll; Tempering treatment has thermal stress, is easy to deform and crack, and reduces the service life of the roll. Moreover, the temperature of the destabilization treatment is very high, which consumes a lot of energy in production and is not conducive to environmental protection.

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