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Plasma nitriding heat treatment process of 35crmov gear sleeve or gear ring for centrifugal compressor

A centrifugal compressor, ion nitriding technology, applied in heat treatment furnaces, heat treatment equipment, metal material coating technology, etc., can solve problems such as not meeting actual needs, achieve increased hardness, increased contact fatigue strength, and improved core performance Effect

Active Publication Date: 2019-03-19
SHENYANG TURBO MASCH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compressor industry is no exception. The fatigue life of gear sleeves (rings) for centrifugal compressors needs to be improved urgently. The above-mentioned traditional ion nitriding heat treatment process obviously cannot meet the actual needs.

Method used

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  • Plasma nitriding heat treatment process of 35crmov gear sleeve or gear ring for centrifugal compressor
  • Plasma nitriding heat treatment process of 35crmov gear sleeve or gear ring for centrifugal compressor
  • Plasma nitriding heat treatment process of 35crmov gear sleeve or gear ring for centrifugal compressor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 35CrMoV gear ring material for centrifugal compressor, its effective thickness is 100mm, its chemical composition: C: 0.048wt.%; Si: 0.42wt.%; Mn: 0.80wt.%; Cr: 13.70wt.%; Mo: 1.50 wt.%; S: 0.004 wt.%; P: 0.026 wt.%; V: 0.29 wt.%; Fe: balance. It is subjected to ion nitriding heat treatment, including the following steps:

[0036] (1) Normalizing treatment, heat preservation at 900°C for 2.5 hours, then air cooling;

[0037] (2) Quenching treatment, heat preservation at 900°C for 2.5 hours, then oil cooling;

[0038] (3) Tempering treatment, heat preservation at 600°C for 4.0 hours, then air cooling;

[0039] (4) Ion nitriding treatment, ion nitriding at 520°C for 22.0 hours, furnace cooling to 200°C, and then air cooling out of the furnace;

Embodiment 2

[0052]35CrMoV gear ring material for centrifugal compressor, its effective thickness is 100mm, its chemical composition: C: 0.048wt.%; Si: 0.42wt.%; Mn: 0.80wt.%; Cr: 13.70wt.%; Mo: 1.50 wt.%; S: 0.004 wt.%; P: 0.026 wt.%; V: 0.29 wt.%; Fe: balance. It is subjected to ion nitriding heat treatment, including the following steps:

[0053] (1) Normalizing treatment, heat preservation at 900°C for 2.5 hours, then air cooling;

[0054] (2) Quenching treatment, heat preservation at 900°C for 2.5 hours, then oil cooling;

[0055] (3) Tempering treatment, heat preservation at 600°C for 4.0 hours, then air cooling;

[0056] (4) Ion nitriding treatment, ion nitriding at 520°C for 18.0 hours, furnace cooling down to 200°C, and then air cooling out of the furnace;

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Abstract

The invention discloses an ion nitriding heat treatment process for a 35CrMoV gear sleeve or gear ring for a centrifugal compressor, which belongs to the technical field of heat treatment process. Calculated according to "effective thickness / 40mm" hours, and then air-cooled; (2) Quenching treatment: quenching temperature 900°C, heat preservation time is calculated according to "effective thickness / 40mm" hours, and then oil cooled; (3) Tempering treatment: tempering temperature 600°C, the holding time is calculated as "1.5 times the quenching holding time" in hours, and then air-cooled; (4) ion nitriding treatment, ion nitriding at 520°C for 18.0-25.0 hours, furnace cooling to 200°C, and then air cooling out of the furnace. The workpiece after ion nitriding heat treatment of the present invention can greatly improve the contact fatigue strength due to the improvement of core strength and hardness.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology, in particular to an ion nitriding heat treatment process of a 35CrMoV gear sleeve or gear ring for a centrifugal compressor. This process is applicable to the ion nitriding heat treatment process of 35CrMoV gear sleeves (rings) for all centrifugal compressors, and is also applicable to the ion nitriding heat treatment process of other product workpieces using 35CrMoV materials. Background technique [0002] At present, the traditional ion nitriding heat treatment process of 35CrMoV gear sleeve (ring) for centrifugal compressor is firstly quenched and tempered, that is, 900°C air cooling + 900°C oil cooling + 660°C air cooling, so that the core performance of the gear sleeve (ring) workpiece Reach the yield strength ≥ 735MPa, hardness HB269 ~ 302; then carry out ion nitriding treatment to make the surface hardness HV5 ≥ 502, and the thickness of the infiltrated layer ≥ 0.35mm. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/25C21D9/40C23C8/38
CPCC21D1/25C21D9/40C23C8/38
Inventor 张忠和陈炜茹海鹏雍建华金星于百芳
Owner SHENYANG TURBO MASCH CORP
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