Differential temperature heat treatment method of minor-diameter high chromium cast-iron roll

Abstract

The invention discloses a differential temperature heat treatment method of a minor-diameter high chromium cast-iron roll, which comprises the steps of roll neck bush welding, heat pretreatment, differential heating, precooling treatment, quenching & cooling, tempering treatment, roll neck bush removal and the like for the minor-diameter roll to achieve differential temperature heat treatment production of the minor-diameter roll. The method is simple and reasonable in technology; the roll is equipped with a roll neck bush, and an air-fuel ratio of a differential temperature furnace burner is adjusted, so that the heating capacity of a furnace is adaptive to the minor-diameter roll; the furnace temperature fluctuation range is greatly reduced; the heating and heat preservation stability is improved; and the heat treatment quality of the minor-diameter roll is improved.

Description

technical field

[0001] The invention relates to a heat treatment method for a roll, in particular to a differential temperature heat treatment method for a roll with a smaller diameter, and belongs to the field of roll production. Background technique

[0002] In recent years, my country's steel industry has developed rapidly, and its steel output has ranked first in the world for many years in a row. At the same time, my country's steel rolling technology is also constantly improving, rolling equipment is constantly updated, there are more and more types of rolls, and the performance requirements for rolls are also getting higher and higher. Under the same design composition and smelting conditions, the performance of the roll mainly depends on the quality of heat treatment. In order to ensure that the roll has high surface hardness and wear resistance while making the core have high toughness, people have developed a differential temperature heat treatment process for rol...

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