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Nitriding heat treatment process for 38CrMoAlA

A nitriding and process technology, applied in the field of nitriding heat treatment process, to achieve the effects of high product quality, low experience requirements and simple operation

Inactive Publication Date: 2016-07-20
CHONGQING HUANDE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing 38CrMoAlA nitriding heat treatment process still has some experience and technicality in the adjustment of process steps and equipment parameters. For new operators, a lot of practice is needed to master the operation skills and produce good quality product

Method used

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with embodiment:

[0027] A nitriding heat treatment process of 38CrMoAlA, comprising the following steps:

[0028] Gas nitriding is selected, and the three-stage gas nitriding method is adopted; that is, the workpiece is heated slowly with the furnace, kept at 440°C for 2 hours, then raised to 500°C, kept at 30h, slowly raised to 560°C, kept at 24h, and then slowly cooled with the furnace to 530°C, keep warm for 6h to remove nitrogen; close the outlet valve and open the inlet valve; then cool the furnace to less than 200°C and leave the furnace for air cooling;

[0029] 1) Heating temperature

[0030] Choice: 440°C, 500°C, 560°C, 530°C respectively

[0031] Reason: In order to ensure that the core strength and hardness of the nitride itself do not change, the nitriding temperature must be lower than the quenching and tempering temperature; if the nitriding temperature is too low, the nitriding speed...

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Abstract

The invention discloses a nitriding heat treatment process for 38CrMoAlA. The nitriding heat treatment process comprises the following procedures that gas nitriding is adopted, and a three-stage gas nitriding method is adopted, that is, the temperature of a workpiece is slowly increased along with a furnace, heat preservation is conducted for 2 h at 440 DEG C, the temperature is increased to 500 DEG C, heat preservation is conducted for 30 h, the temperature is slowly increased to 560 DEG C, heat preservation is conducted for 24 h, the temperature of the workpiece is slowly decreased to 530 DEG C along with the furnace, heat preservation is conducted for 6 h, and denitriding treatment is conducted; a gas outlet valve is closed, and a gas inlet valve is opened; and the furnace is cooled to 200 DEG C or lower, and the workpiece is discharged out of the furnace and air-cooled. The nitriding heat treatment process is easy to operate and has low requirements for experience of an operator, and the product quality is high.

Description

technical field [0001] The invention relates to a nitriding heat treatment process of 38CrMoAlA. Background technique [0002] The existing 38CrMoAlA nitriding heat treatment process still has some experience and technicality in the adjustment of process steps and equipment parameters. For new operators, a lot of practice is needed to master the operation skills and produce Good quality product. Contents of the invention [0003] In order to achieve the purpose of the present invention, the present invention provides a nitriding heat treatment process of 38CrMoAlA which is convenient, quick and easy to use. [0004] In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions: [0005] A nitriding heat treatment process of 38CrMoAlA, comprising the following steps: [0006] Gas nitriding is selected, and the three-stage gas nitriding method is adopted; that is, the workpiece is heated slowly with the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/26
Inventor 张翠云
Owner CHONGQING HUANDE TECH CO LTD
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