Differential-temperature thermal treatment process for forged steel BD roller

A technology of differential temperature heat treatment and process method, which is applied in the direction of heat treatment furnace, heat treatment equipment, heat treatment process control, etc. It can solve the problems of insufficient impact toughness and wear resistance, so as to improve toughness, reduce scrap rate, and control grain length. a large degree of effect

Active Publication Date: 2020-05-12
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved in the present invention is to provide a process method for differential temperature heat treatment of forged steel BD rolls, which improves the wear resistance of the roll body and the toughness of the roll neck, and avoids insufficient wear resistance caused by low hardness of the roll body. Avoiding insufficient impact toughness caused by high roll neck hardness, making the roll body and roll neck hardness meet the process requirements

Method used

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  • Differential-temperature thermal treatment process for forged steel BD roller

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Effect test

Embodiment 1

[0028] The diameter of the neck of the forged steel BD roll is 460mm, the width-to-depth ratio of the roll body is 0.9-1.2, the groove bottom radius of the roll body before heat treatment is 4mm, the groove side radius is 2mm, and the roll body length is 12mm. First heat it in a high-temperature resistance furnace to 900°C, keep it warm for 25 hours, take it out of the furnace, cool it with water for 50 minutes, and air-cool it for 25 minutes to install it in the furnace, temper it at 610°C and keep it warm for 35 hours. , The differential heating temperature is 1090°C, the holding time is 90min, the water cooling is 60min after the differential heating and holding, the air cooling is 50min, and the furnace is tempered, the tempering temperature is 530°C, and the holding time is 39h.

Embodiment 2

[0030] The diameter of the neck of the forged steel BD roll is 460mm, the width-to-depth ratio of the roll body is 0.9-1.1, the groove bottom radius of the roll body before heat treatment is 5mm, the groove side radius is 4mm, and the roll body length is 13mm. First heat in a high-temperature resistance furnace to 930°C, keep it warm for 23 hours, then heat it in a furnace for 50 minutes, then air cool it for 30 minutes, keep it at 590°C for 39 hours, cool it down to 360°C after the heat preservation, and heat it for 12 hours. , The differential heating temperature is 1070°C, the holding time is 90min, the water cooling is 60min after the differential heating and holding, the air cooling is 50min, and the furnace is tempered, the tempering temperature is 535°C, and the holding time is 39h.

Embodiment 3

[0032] The diameter of the neck of the forged steel BD roll is 430mm, the width-to-depth ratio of the roll body is 0.8-1.1, the groove bottom radius of the roll body before heat treatment is 5mm, the groove side radius is 3mm, and the length of the roll body is 15mm. First heat it in a high-temperature resistance furnace to 940°C, keep it warm for 26 hours, then put it in the furnace after cooling it in water for 55 minutes, then air cool it for 30 minutes, keep it warm at 610°C for 36 hours, cool it down to 410°C after the heat preservation is over, and heat it with a differential temperature furnace after 11 hours of heat preservation. The differential temperature heating temperature is 1060°C, the holding time is 100min, the water cooling is 58min after the differential heating and holding time, the air cooling is 56min, and the furnace is tempered, the tempering temperature is 545°C, and the holding time is 39h.

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Abstract

The invention discloses a differential-temperature thermal treatment process for a forged steel BD roller, and relates to the technical field of high-performance roller special thermal treatment. Thedifferential-temperature thermal treatment process comprises three aspects of a forged steel BD roller thermal treatment process, pretreatment before heating, and thermal treatment process parameters.The differential-temperature thermal treatment process improves wear resistance of a roller body and toughness of a roller neck, avoids insufficient wear resistance caused by too low roller body hardness, and avoids insufficient impact toughness caused by too high hardness of the roller neck; and the roller body and the roller neck of the prepared forged steel BD roller have hardness which can meet the process requirements, and can meet the design purposes of high strength and high wear resistance of the roller body as well as high toughness of the roller neck.

Description

technical field [0001] The invention relates to the technical field of special heat treatment of high-performance rolls, in particular to a process method for differential temperature heat treatment of forged steel BD rolls. Background technique [0002] For the blanking rolls used in the blanking mill, the forged steel material is designed with grooves of different depths due to the requirements of on-site rolling conditions. Usually, the ratio of the width to the depth of the grooves ranges from 0.8 to 1.5. In order to meet the requirements of use, the roll body needs to obtain a hardness of 55-65HSD to ensure high strength and wear resistance, and the roll neck needs to obtain a hardness of 30-40HSD to have a certain toughness to meet the requirements of the roll neck rolling process. Rolling conditions such as bending moment and torque. If the heat treatment process of overall heating and cooling is adopted, the roll body and roll neck cannot be guaranteed to meet the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D11/00
CPCC21D9/38C21D11/00
Inventor 刘娣胡兵王延青苏军新杨静田春霞
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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