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Heat treatment process for carburizing bearing steel

A carburizing bearing and bearing steel technology, applied in the field of carburizing bearing steel heat treatment process, can solve the problems of low production efficiency, low efficiency, long time, etc., and achieve the effect of improving production efficiency, reducing cost and improving surface structure.

Pending Publication Date: 2022-05-13
成都天马精密机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The total time of a high-temperature tempering step includes heating, heat preservation and cooling processes, which is about 10 hours. The whole step takes a long time and the efficiency is low; after the workpiece completes the carburizing and quenching step, the production efficiency of the product 150 pieces / day, low production efficiency

Method used

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  • Heat treatment process for carburizing bearing steel
  • Heat treatment process for carburizing bearing steel
  • Heat treatment process for carburizing bearing steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Carburized bearing steel heat treatment process, including the following steps:

[0044] Carburizing and quenching steps: start to pass RX gas for exhaust before heating up, the exhaust time is 1h, RX gas is continuously introduced throughout the whole process, and the flow rate of RX gas is 5m 3 / h;

[0045] Intensive infiltration stage: raise the temperature in the furnace to 920°C and keep it warm for 70 hours; during the heat preservation period, the set value of carbon potential is 1.2%, and the carbon potential is lower than the set value, and the natural gas flow rate is 0.2m 3 / h, the carbon potential is higher than the set value, stop feeding natural gas;

[0046] Diffusion stage: heat preservation at 940°C for 14 hours; during the heat preservation period, the carbon potential set value is 1.0%, and the carbon potential is lower than the set value, and natural gas is introduced, and the flow rate of natural gas is 0.2m 3 / h, the carbon potential is higher th...

Embodiment 2

[0053] Carburized bearing steel heat treatment process, including the following steps:

[0054] Carburizing and quenching steps:

[0055] Intensive infiltration stage: raise the temperature in the furnace to 940°C and keep it warm for 60 hours; during the heat preservation period, the set value of the carbon potential is 1.35%, and the carbon potential is lower than the set value, and the natural gas is introduced, and the flow rate of the natural gas is 0.8m 3 / h, the carbon potential is higher than the set value, stop feeding natural gas;

[0056] Diffusion stage: heat preservation at 940°C for 18 hours; during the heat preservation period, the carbon potential set value is 1.2%, and the carbon potential is lower than the set value, and natural gas is introduced, and the flow rate of natural gas is 0.8m 3 / h, the carbon potential is higher than the set value, stop feeding natural gas;

[0057] Insulation stage: lower the temperature to 880°C and keep it for 12 hours; durin...

Embodiment 3

[0064] Carburized bearing steel heat treatment process, including the following steps:

[0065] Carburizing and quenching steps:

[0066] Intensive infiltration stage: raise the temperature in the furnace to 930°C and keep it warm for 63 hours; during the heat preservation period, the set value of carbon potential is 1.3%, and the carbon potential is lower than the set value, and natural gas is introduced, and the flow rate of natural gas is 0.5m 3 / h, the carbon potential is higher than the set value, stop feeding natural gas;

[0067] Diffusion stage: heat preservation at 920°C for 15 hours; during the heat preservation period, the set value of carbon potential is 1.0%, and the carbon potential is lower than the set value, and natural gas is introduced at a flow rate of 0.5m 3 / h, the carbon potential is higher than the set value, stop feeding natural gas;

[0068] Insulation stage: lower the temperature to 880°C and keep the temperature for 10 hours; during the insulation...

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Abstract

The invention relates to the field of bearing heat treatment, and particularly discloses a carburizing bearing steel heat treatment process which comprises the following steps of carburizing and quenching, refining treatment, secondary quenching and low-temperature tempering. And refining treatment: raising the temperature to 750-840 DEG C, preserving heat for 1-2 hours, then rapidly quenching in oil for cooling, introducing the inorganic gas in the atmosphere of mixed gas of the inorganic gas and the organic gas, introducing the organic gas in the heat preservation stage, and stopping introducing the organic gas in the heat preservation stage until the heat preservation is finished. By means of the heat treatment process, the production efficiency can be remarkably improved, and meanwhile the quality of bearing parts is improved.

Description

technical field [0001] This application relates to the field of bearing heat treatment, more specifically, it relates to a carburized bearing steel heat treatment process. Background technique [0002] For bearing parts made of carburized bearing steel G20Cr2Ni4, the heat treatment process of deep carburizing (depth of hardened layer ≥ 2.5mm) is usually: carburizing quenching → high temperature tempering (2-3 times) → secondary quenching + low temperature tempering. Especially for carburized bearing steel G20Cr2Ni4, if the bearing parts require a hardened layer depth ≥ 4mm, in order to make the surface structure qualified after secondary quenching, it must undergo two high-temperature tempering to ensure that the surface structure and hardness after secondary quenching are qualified. Therefore, high temperature tempering is a necessary process. [0003] The total time of a high-temperature tempering step includes heating, heat preservation and cooling processes, which is ab...

Claims

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Application Information

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IPC IPC(8): C23C8/22C21D1/18C21D1/74C21D6/00
CPCC23C8/22C21D1/18C21D6/00C21D1/74
Inventor 杨群浩邹勇余淮
Owner 成都天马精密机械有限公司
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