Heat treatment method for one-piece casting hot-rolled strip supporting roller

Abstract

The invention discloses a heat treatment method for a one-piece casting hot-rolled strip supporting roller and belongs to the technical field of roller heat treatment methods. The heat treatment method is used for carrying out heat treatment on the one-piece casting hot-rolled strip supporting roller. According to the technical scheme, the heat treatment method comprises the following steps of entirely heating the roller to a certain temperature by virtue of a resistance furnace, then transferring the roller to a differential temperature furnace for further heating the surface layer of a roller body to a higher temperature, carrying out heat preservation for enough time, tapping, and carrying out spray quenching and tempering treatment so that the microstructure of the roller body is changed into bainite and the microstructures of a roller neck are sorbite and pearlite. By the differential temperature treatment method, the one-piece casting hot-rolled strip supporting roller exhibits excellent wear resistance and comprehensive mechanical properties, so that the wear resistance, thermal cracking resistance and accident resistance of the roller body are improved. By innovating the heat treatment method for the one-piece casting hot-rolled strip supporting roller, the problem that no heat treatment method is suitable for the one-piece casting hot-rolled strip supporting roller in a long term is solved, the quality of the roller is significantly improved, and user requirements in use and enterprise economy benefits are met.

Description

technical field [0001] The invention relates to a method for heat treating cast hot-rolled strip support rolls, and belongs to the technical field of roll heat treatment methods. Background technique [0002] The hot-rolled strip support roll is an important part of hot-rolling, which can be manufactured by forging and casting. The advantage of the integrally forged hot-rolled strip support roll is that all parts of the roll have the same composition. The integrally forged support roll can be widely used in hot-rolled strip mills. The hardness of the roll body is mostly controlled at 55-70HSD, which has good wear resistance. However, the cost of forged backup rolls is far greater than that of integrally casted backup rolls, and if traditional heat treatment methods are used for integrally cast backup rolls, their technical parameters such as wear resistance and hardness drop cannot be well achieved. Requirements. At present, various roll production enterprises still contin...

AI Technical Summary

Problems solved by technology

The advantage of the integrally forged hot-rolled strip support roll is that all parts of the roll have the same composition. The integrally forged support roll can be widely used in hot-rolled strip mills. The hardness of the roll body is mostly controlled at 55-70HSD, which has good wear resistance. However, the cost of forged backup rolls is far greater than that of integrally casted backup rolls, and if traditional heat treatment methods are used for integrally cast backup rolls, their technical parameters such as wear resistance and hardness drop cannot be well achieved. Requirements

At present, various roll production enterprises still continue to manufacture hot-rolled strip support rolls in two ways. Some use the integral forging method to produce forged support rolls. Although the quality is good and the service life is long, the production cost remains high; Although the production cost is relatively low, the casting support roll has a short service life and cannot meet the needs of production. This situation has not been effectively changed so far.

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