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A kind of carbonitriding heat treatment process method

A process method and carbonitriding technology, applied in the field of heat treatment, can solve the problems of poor economy, long carbonitriding heat treatment process cycle, coarse carbides, etc., to achieve short cycle, shorten the heat treatment process flow, shorten the heat treatment process The effect of processing time

Active Publication Date: 2019-02-05
LUOYANG LYC BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to give full play to the potential of the existing high-carbon chromium bearing steel GCr15, solve the problems of long cycle and poor economy of the conventional carbonitriding heat treatment process, and the defects of non-horse structure, network structure and coarse carbide, The invention provides a carbonitriding heat treatment process, which makes the treated bearing ring have higher hardness, higher wear resistance and longer life, and improves the reliability of the bearing operation.

Method used

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  • A kind of carbonitriding heat treatment process method
  • A kind of carbonitriding heat treatment process method
  • A kind of carbonitriding heat treatment process method

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Embodiment 1

[0020] Embodiment 1: the described carbonitriding heat treatment process is as follows:

[0021] (1) The equipment adopts UBE-1200 multi-purpose furnace.

[0022] (2) Carburizing medium: nitrogen + methanol + ammonia + propane; use an oxygen probe to control the carbon potential, control the CO content to 20%, and the ammonia flow rate to 0.32m 3 / h, nitrogen is 4m 3 / h, methanol is 4.4L / h, and the flow rate of propane is automatically controlled by an oxygen probe to realize the control of the carbon potential of the furnace atmosphere;

[0023] (3) Loading method: load 3 layers / disc, select the number of loading layers according to the height of the workpiece, the gap between the workpiece along the height direction and the upper tray is 30mm; each layer is separated by a net , Keep a gap of 6mm between the workpieces of each layer to ensure the uniformity of the permeation layer.

[0024] (4) Process parameters: carbonitriding temperature 820°C, carbon potential: 1.25%, ...

Embodiment 2

[0026] Embodiment 2: the carbonitriding heat treatment process of described new atmosphere is as follows:

[0027] (1) The equipment adopts UBE-1200 multi-purpose furnace.

[0028] (2) Carburizing medium: nitrogen + methanol + ammonia + propane; use an oxygen probe to control the carbon potential, control the CO content to 19.5%, and the ammonia flow rate to 0.32m 3 / h, nitrogen is 4.1m 3 / h, methanol is 4.2L / h, and the flow rate of propane is automatically controlled by an oxygen probe to realize the control of the carbon potential of the furnace atmosphere;

[0029] (3) Loading method: load 3 layers / disc, select the number of loading layers according to the height of the workpiece, the gap between the workpiece along the height direction and the upper tray is 30mm; each layer is separated by a net , Keep a gap of 6mm between the workpieces of each layer to ensure the uniformity of the permeation layer.

[0030] (4) Process parameters: carbonitriding temperature 820°C, car...

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Abstract

The invention discloses a carbonitriding heat treatment technique under a new atmosphere. The technique comprises the following steps that (a), a multi-purpose chamber furnace suitable for carburizing treatment is selected; (b), a nitrogen, methyl alcohol, ammonia gas and dimethylmethane carburizing medium is adopted, and an oxygen probe is adopted to control the carbon potential, so that control over the carbon potential of the atmosphere in the furnace is achieved; (c), according to a charging mode, charging layers are chosen according to the heights of workpieces, and gaps are kept between the workpieces of each layer to guarantee the uniformity of infiltration layers; (d), according to technological parameters, the carbonitriding temperature is 815 DEG C-825 DEG C, the carbon potential is 1.20%-1.30%, and strong infiltration is conducted for 3 h-3.5 h; in the diffusion period, the temperature is 815 DEG C-825 DEG C, the carbon potential is 1.10%-1.20%, and diffusion is conducted for 3 h-3.5 h; KR-218 fast bright quenching oil is used for quenching, and cooling is conducted for 8 min-15min; and air cooling is conducted after tempering; and (e), steel foil is used for carbon determination during strong infiltration of each furnace. According to the carbonitriding heat treatment technique under the new atmosphere, a carbonitriding layer with a certain depth can be obtained in a relatively short time, and higher hardness is achieved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and relates to a carbonitriding heat treatment process, in particular to a carbonitriding heat treatment process for a high-carbon chromium bearing steel GCr15 bearing ring. The present invention is only applicable to the carbonitriding heat treatment process of the inner and outer rings of the bearing with the diameter of the bearing ring not greater than 120 mm and the effective wall thickness not less than 2.0 mm. The invention is applicable to a box-type multipurpose furnace, and carries out carbonitriding treatment on bearing parts. Background technique [0002] As we all know, GCr15 is the most widely used high-carbon chromium bearing steel in the bearing industry. Some domestic and foreign well-known brands of small and medium-sized precision bearings or bearings used in special working conditions mostly use this material and adopt special heat treatment processes. For example, car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/32C21D9/40C21D1/18
CPCC21D1/18C21D9/40C21D2211/008C23C8/32
Inventor 张玲孙伟仵永刚魏建文曾朝凡皇天鸣刘利军
Owner LUOYANG LYC BEARING
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