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Differential-temperature heat treating method for roller

A technology of differential temperature heat treatment and roll, which is applied in the field of heat treatment, can solve the problems of affecting the anti-accident ability of the roll, long heat preservation time, waste of energy consumption, etc., achieve good core structure and comprehensive mechanical properties, reduce heat treatment energy consumption, reduce The effect of production costs

Active Publication Date: 2016-02-03
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The current heat treatment process for forging and casting large backup rolls is generally induction hardening process and differential temperature quenching process. Different types of rolls have poor adaptability
The differential temperature quenching process adopts the flame heating method. In order to ensure that the heating depth of the working layer meets the requirements, the traditional differential temperature quenching process has a higher preheating temperature and a longer holding time. Heating up at full speed, resulting in inconsistencies in the temperature of the rolls during heat preservation, and poor temperature uniformity
In the later stage of quenching, the hardness will be uneven, and the temperature of the core will continue to rise, resulting in changes in the structure of the core, resulting in a decrease in comprehensive mechanical properties and affecting the accident resistance of the roll during rolling
The service life of the roll is low, and the energy consumption in the whole heat treatment stage is seriously wasted, which increases the production cost of the enterprise

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The material of the roll required for heat treatment is Cr5, the specification is Φ1500mm, and the required thickness of the working layer is 75mm.

[0047] The heat treatment process of the present embodiment is as follows:

[0048] ①Process preparation, installing temperature measuring thermocouples on the rolls to be processed;

[0049] ②Hang the finished roll into the air furnace for overall preheating. Set the preheating temperature to 500°C. When the temperature measured by the thermocouple to be measured reaches the preset temperature of 500°C, stop heating and heat preservation for 15 hours, and the heat preservation is over. Finally, the roll is lifted out and transferred to the differential temperature furnace;

[0050] ③ Hang the preheated roll into the differential temperature furnace, first preheat it at a heating rate of 15°C / min to the initial fixed temperature of 850°C, then raise the temperature to 900°C at a heating rate of 25°C / min, keep it warm for ...

Embodiment 2

[0055] The material of the roll required for heat treatment is Cr4, the specification is Φ1500mm, and the required thickness of the working layer is 75mm.

[0056] The heat treatment process of the present embodiment is as follows:

[0057] ①Process preparation, installing temperature measuring thermocouples on the rolls to be processed;

[0058] ②Hang the finished roll into the air furnace for overall preheating. Set the preheating temperature to 500°C. When the temperature measured by the thermocouple to be measured reaches the preset temperature of 500°C, stop heating and heat preservation for 15 hours, and the heat preservation is over. Finally, the roll is lifted out and transferred to the differential temperature furnace;

[0059] ③ Hang the preheated roll into the differential temperature furnace, first preheat it at a heating rate of 15°C / min to the initial fixed temperature of 850°C, then raise the temperature to 900°C at a heating rate of 22°C / min, keep it for 2 min...

Embodiment 3

[0064] The material of the roll required for heat treatment is Cr3, the specification is Φ1200mm, and the required thickness of the working layer is 65mm.

[0065] The heat treatment process of the present embodiment is as follows:

[0066] ① Process preparation, install temperature measuring thermocouples on the rolls to be processed;

[0067]②Hang the finished roll into the air furnace for overall preheating. Set the preheating temperature to 480°C. When the temperature measured by the thermocouple to be measured reaches the preset temperature of 480°C, stop heating and heat preservation for 11 hours, and the heat preservation is over. Finally, the roll is lifted out and transferred to the differential temperature furnace;

[0068] ③ Hang the preheated roll into the differential temperature furnace, preheat it at a heating rate of 15°C / min to the initial fixed temperature of 850°C, then raise the temperature to 900°C at a heating rate of 20°C / min, keep it warm for 2 minutes...

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Abstract

The invention discloses a differential-temperature heat treating method for a roller, and relates to the technical field of heat treating. The differential-temperature heat treating method includes the steps of a technological preparation stage, a preheating stage, a differential-temperature preheating stage, a high-speed temperature rising stage and a high-temperature heat preservation stage. According to the differential-temperature heat treating method, the preheating temperature is low and is 480 DEG C to 500 DEG C, the constant temperature before high-speed temperature rising is 800 DEG C to 850 DEG C, a stage-type temperature rising mode is adopted for the high-speed temperature rising stage, three temperature rising nodes exist, heat preservation is carried out for two minutes every time one temperature node is achieved, high-temperature heat preservation is divided two stages, and the heat preservation time and the temperature of the two stages are different. The roller prepared with the heat treating method has high hardness evenness and the good core microstructure, energy consumption of heat treatment can be reduced, and the production cost of an enterprise can be reduced.

Description

technical field [0001] The invention relates to a differential temperature heat treatment process method for rolls, and relates to the technical field of heat treatment. Background technique [0002] At present, the heat treatment process of forging and casting large backup rolls is generally induction hardening process and differential temperature quenching process. The induction hardening process is limited by the heating depth and is not suitable for making rolls with deep working layers. Different types of rolls have poor adaptability. The differential temperature quenching process adopts the flame heating method. In order to ensure that the heating depth of the working layer meets the requirements, the traditional differential temperature quenching process has a higher preheating temperature and a longer holding time. The temperature rises at full speed, resulting in inconsistent temperatures throughout the roll during heat preservation, and poor temperature uniformity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D1/18
Inventor 崔聪聪梁俊良杨静
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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