Heat treatment method for high ferrochrome roll requiring stepped hardness of roll body

Abstract

The invention discloses a heat treatment method for a high ferrochrome roll requiring stepped hardness of a roll body. The method mainly comprises the following steps of: before the roll is preheated, coating ceramic fibers on parts, which have low hardness requirement on the roll body, close to the roll necks of the roll; performing preheating treatment, differential temperature heat treatment and quenching treatment; before tempering, removing the ceramic fibers on two end parts of the roll; and performing tempering treatment on the roll in a low temperature tempering furnace. By the heat treatment method, the technical requirement that the roll body of the roll has stepped hardness can be met.

Description

technical field [0001] The invention relates to the field of rolling steel manufacturing, in particular to a heat treatment method when the hardness of the roll body is required to have a gradient when manufacturing high-chromium iron rolls. Background technique [0002] The roll is the main consumable spare part in steel rolling production. The roll mainly includes the roll body and the roll neck connected to the two ends of the roll body. The quality of the roll directly affects the production rate of the rolling mill and the output, quality and production cost of the rolled material. Because high-chromium ferrocontains high-hardness M7C3 carbides, and the carbides are distributed in the matrix in the form of blocks, the continuity of the matrix is ​​enhanced. Therefore, high-chromium ferro has good toughness and wear resistance, and it has good performance in the manufacture of rolls. Effect. The production process of the roll must go through a heat treatment process in ...

AI Technical Summary

Problems solved by technology

This method is mainly a heat treatment method to solve the cracking of the end of the roll, and it cannot solve the problem of the stepped hardness requirement of the roll body