High-strength anti-nodulation CNRE rare earth heat-resistant steel for furnace bottom roller and preparation method of high-strength anti-nodulation CNRE rare earth heat-resistant steel

Abstract

The invention relates to the field of metallurgical machinery, in particular to high-strength anti-nodulation CNRE rare earth heat-resistant steel for a furnace bottom roller and a preparation methodof the high-strength anti-nodulation CNRE rare earth heat-resistant steel. The steel comprises the following chemical components in percentage by weight: 0.2 to 0.5 percent of C, 1.5 to 2.5 percent ofSi, 6.0 to 13.0 percent of Mn, 16.0 to 26.0 percent of Cr, 1.0 to 6.0 percent of Ni, 0.3 to 2.0 percent of Mo, 0.05 to 0.50 percent of V, 0.05 to 0.50 percent of Nb, 0.2 to 0.6 percent of N, 0.005 to0.5 percent of RE and the balance of Fe. According to the high-strength anti-nodulation rare earth heat-resistant steel for the furnace bottom roller, strong solution strengthening and precipitationstrengthening effects are generated through C and N co-alloying and V and Nb micro-alloying, and the initial strength of the furnace bottom roller is improved; a high-temperature structure is stabilized by means of rare earth microalloying; the attenuation rate of high-temperature strength is reduced; surface abrasion of the furnace bottom roller is reduced; the anti-nodulation capacity is improved; moreover, an intermediate frequency furnace high-nitrogen alloying technology, a high-purity rare earth treatment technology and a centrifugal casting technology are adopted, so that a furnace bottom roller casting which is uniform in component, compact in structure and excellent in performance is obtained; and the technical problems of deformation, nodulation and the like of the furnace bottomroller can be effectively solved.

Description

technical field [0001] The invention relates to the field of metallurgical machinery, in particular to a high-strength, nodulation-resistant CNRE rare earth heat-resistant steel for hearth rolls and a preparation method thereof. Background technique [0002] Post-rolling heat treatment is an essential process for the production of steel slabs. The continuous heat treatment furnace is the key production equipment for post-rolling heat treatment. The hearth roller is the core heat-resistant component of the continuous heat treatment furnace. It is mainly used to transport the steel slab for heat treatment. In order to realize the continuous heat treatment process. The service environment of hearth rollers is very harsh. They work in the temperature range of 900-1200°C for a long time, and the surface bears relatively large compressive stress of the steel plate. Hearth rollers need to have high high-temperature strength. At the same time, during the continuous heat treatment p...

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Problems solved by technology

[0005] The object of the present invention is to provide a high-strength, nodulation-resistant CNRE rare earth heat-resistant steel for hearth rolls and a preparation method thereof, through C, N co-alloying and V, Nb, RE micro-alloying, to improve high-temperature strength and anti-nodulation Nodulation ability, solving the technical problems of insufficient strength and serious nodulation of traditional high Cr-high Ni heat-resistant steel hearth rolls, with lower alloy cost, thereby greatly improving the production efficiency of continuous heat treatment furnaces and reducing production costs

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