Rare earth boronizing process for roller

Abstract

The invention relates to a rare earth boronizing process for a roller. The process comprises the following steps: a co-cementation agent is prepared; the steel roller is co-cemented with the co-cementation agent at high temperature; natural cooling is performed in air; heating, oil-quenching, tempering heating and oil cooling are performed on the steel roller in a salt-bath furnace. By adopting the rare earth boronizing process, the surface hardness of the steel roller can be effectively improved, a co-cementation layer containing two iron boride and iron boride can be formed, the two iron boride and iron boride are wedged into a matrix in a needle-shaped manner, the co-cementation layer and the central part are combined tightly, so that the toughness and crack resistance are enhanced, a small amount of rare earth compound appears in the tissue, the heat resistance property and fatigue resistance fatigue property of the roller are enchanted, and the service life the roller is prolonged obviously.

Description

technical field [0001] The invention relates to a rare earth boron co-infiltration process, in particular to a rare earth boron co-infiltration process for rolls that can effectively improve the service life of 40 chromium 40Cr steel rolls. Background technique [0002] At present, in industrial production, the service life of rolls is generally low. After rolling 80-100 tons of a new set of rolls, it often needs to be repaired due to wear and tear. Each repair can roll 60-80 tons. Once, after rolling 200-400 tons of steel pipes, radial cracks appear on the upper edge of the rolls and cannot be repaired and completely fail. According to statistics, the general roll consumption is 0.7 kg / ton steel pipes, which is far behind foreign countries, which seriously restricts the quality of steel pipes. Improvements in quality and productivity. Contents of the invention [0003] In order to solve the problem of low service life of rolls used in industrial production, the invention...

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Problems solved by technology

[0003] In order to solve the problem of low service life of rolls used in industrial production, the invention provides a rare earth boron co-infiltration process for rolls. The rare earth boron co-infiltration process for rolls can effectively improve the surface hardness of the rolls, and can form iron boride and In the co-infiltrated layer of iron boride, ferric boride and iron boride are wedged into the matrix in the shape of fine needles, and the infiltrated layer is closely combined with the core tissue, which enhances the toughness and crack resistance of the roll, and a small amount of The rare earth compound enhances the thermal fatigue resistance of the roll and significantly improves the service life of the roll

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