Heat treatment method for improving hardness uniformity of roller body of support roller of forged steel

A heat treatment method and technology of uniform hardness, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of low hardness uniformity of backup rolls, improve accident resistance, improve roll body hardness uniformity, and shorten holding time. Effect

Active Publication Date: 2017-06-27
TIANJIN HEAVY EQUIP ENG RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a heat treatment method for improving the hardness uniformity of the forged steel backing roll body, so as to solve the problem of low hardness uniformity of the backing roll after the existing heat treatment method

Method used

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  • Heat treatment method for improving hardness uniformity of roller body of support roller of forged steel
  • Heat treatment method for improving hardness uniformity of roller body of support roller of forged steel
  • Heat treatment method for improving hardness uniformity of roller body of support roller of forged steel

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The size and main technical requirements of the back-up rolls for cold-acid rolling in a steel plant are as follows:

[0058]

[0059] The existing differential temperature heat treatment is carried out on the above-mentioned support roller, and the hardness test results are as follows:

[0060]

[0061] According to the above requirements, the hardness uniformity of the roll body needs to be improved to meet the technical requirements. The specific heat treatment process is as follows:

[0062] 1) First, apply a temperature measuring thermocouple (2 in total) on the shoulder of the back-up roll body and the middle of the roll body to monitor the temperature of the back-up roll workpiece during heat treatment.

[0063] 2) if figure 2 As shown, the high temperature resistant asbestos felt with a thickness of 80mm and a width of 350mm is glued and wrapped on the shoulder of the roller body, the main purpose is to reduce the temperature rise rate of the shoulder of t...

Embodiment 2

[0069] The size and main technical requirements of a galvanized back-up roll in a steel plant are as follows:

[0070]

[0071] The existing differential temperature heat treatment is carried out on the above-mentioned support roller, and the hardness test results are as follows:

[0072]

[0073] According to the above requirements, the hardness uniformity of the roll body needs to be improved to meet the technical requirements. The specific heat treatment process is as follows:

[0074] 1) First, apply a temperature measuring thermocouple (total 2) on the upper and lower shoulders of the back-up roll body and in the middle of the roll body to monitor the temperature of the back-up roll workpiece during heat treatment.

[0075] 2) if figure 2 As shown, the high temperature resistant asbestos felt with a thickness of 100mm and a width of 300mm is glued and wrapped on the shoulder of the roller body; the main purpose is to reduce the temperature rise rate of the shoulde...

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Abstract

The invention relates to a heat treatment method for improving the hardness uniformity of a roller body of a support roller of forged steel. The heat treatment method comprises the steps that the temperature of the support roller is kept for 5-15 hours at the furnace temperature of 200-300 DEG C; the furnace temperature rises to 450-550 DEG C at the temperature rising speed smaller than or equal to 40 DEG C / h, and the temperature is kept for 10-30 hours; the furnace temperature drops to 350-450 DEG C at the cooling speed smaller than or equal to 30 DEG C / h; the furnace temperature drops to 150 DEG C below at the cooling speed smaller than or equal to 20 DEG C / h; and the support roller is taken out from a medium-low temperature tempering furnace and is cooled to the normal temperature in the air. By the adoption of the heat treatment method, the support roller can meet the requirements that the hardness of the roller body ranges from 60 HSD to 78 HSD and the uniformity of hardness delta HSD is smaller than or equal to 4, and the quality level of the support roller of the forged steel is increased.

Description

technical field [0001] The invention relates to the technical field of a heat treatment method for improving hardness uniformity, in particular to a heat treatment method for improving the hardness uniformity of a forged steel backup roll body. Background technique [0002] As an important tool and consumable part of steel rolling equipment, backup rolls have been continuously developed along with the progress of steel rolling technology and the update of steel rolling equipment. Their performance directly determines the cost, performance and output of rolled products. Cr5 type forged steel back-up rolls have high alloy content, superior hardenability, hardenability, good wear resistance and fracture resistance, and become the mainstream product of strip mill back-up rolls. In order to manufacture high-performance backup rolls, it is necessary to go through steelmaking, forging, heat treatment, machining and other processes, especially the heat treatment process directly det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/70C21D9/38C21D6/00
CPCC21D1/18C21D1/70C21D6/004C21D6/005C21D6/008C21D9/38
Inventor 白兴红赵席春郭峰陈太辉姜德鹏
Owner TIANJIN HEAVY EQUIP ENG RES
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