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Differential temperature heat treatment method for small diameter high chromium cast iron roll

A technology of differential temperature heat treatment and high chromium cast iron, applied in the field of heat treatment of rolls and differential temperature heat treatment, it can solve the problems of large furnace temperature fluctuation and inability to install the furnace, so as to improve the performance of the roll, reduce the fluctuation range, and improve the Markov range. Effects of Body Transformation Variables

Active Publication Date: 2014-10-08
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to provide a differential temperature heat treatment method for small-diameter high-chromium cast iron rolls, so as to solve the technical problems that the traditional differential temperature furnace cannot be installed and the furnace temperature fluctuates greatly when heat-treating small-diameter rolls

Method used

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  • Differential temperature heat treatment method for small diameter high chromium cast iron roll
  • Differential temperature heat treatment method for small diameter high chromium cast iron roll
  • Differential temperature heat treatment method for small diameter high chromium cast iron roll

Examples

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Effect test

Embodiment 1

[0041] A differential temperature heat treatment method for small-diameter high-chromium cast iron rolls. In this embodiment, the differential temperature furnace 2 used is an MC3 horizontal differential temperature furnace. , Designed for rolls with a roll neck diameter of 350mm to 750mm. There are more than 30 burners arranged in the differential temperature furnace, and the burners in different positions have different air-fuel ratio standard values, that is, different air pressure standard values ​​and gas pressure standard values. In general, the standard value of the air pressure of these burners is between 9Mpa and 12Mpa, and the standard value of the gas pressure is between 1.8Mpa and 2.4Mpa. In the present embodiment, the roll 1 to be processed is a high-chromium cast iron roll of the KmTBCr20Mo material, and its structure is as follows figure 2 As shown, the roll body 11 has a diameter of 550 mm and a length of 2000 mm, and the roll necks 12 at both ends of the roll ...

Embodiment 2～5

[0057] The difference with Example 1 is shown in the table below, and other conditions are the same.

[0058]

[0059] After testing, the fluctuating range of the furnace temperature has a certain correlation with the fit gap between the roll neck and the roll neck sleeve. When the fit gap is between 3 mm and 8 mm, the roll necks in Examples 2, 4, and 5 are adopted. When the inner diameter of the sleeve is set, the fluctuation range of the furnace temperature is between -3°C and +4°C, the fluctuation range is small, and the furnace performance is more stable. When the fitting gap is below 3 mm, the positive deviation of the furnace temperature is large, and the fluctuation range of the furnace temperature in Example 3 is between -2°C and +7°C. When the fit gap is above 8 mm, the negative deviation of the furnace temperature is relatively large, and the fluctuation range of the furnace temperature in Example 1 is between -6°C and +3°C. Therefore, the preferred fit clearance...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/38C21D1/18
Inventor 程志平张建吴昊
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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