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Ionic nitriding heat treatment technique of 35CrMoV toothed sleeve or toothed 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 that cannot meet actual needs, achieve increased hardness, increased contact fatigue strength, and improved core performance Effect

Active Publication Date: 2017-06-27
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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  • Ionic nitriding heat treatment technique of 35CrMoV toothed sleeve or toothed ring for centrifugal compressor
  • Ionic nitriding heat treatment technique of 35CrMoV toothed sleeve or toothed ring for centrifugal compressor
  • Ionic nitriding heat treatment technique of 35CrMoV toothed sleeve or toothed ring for centrifugal compressor

Examples

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 ionic nitriding heat treatment technique of a 35CrMoV toothed sleeve or toothed ring for a centrifugal compressor and belongs to the technical field of heat treatment techniques. The ionic nitriding heat treatment technique comprises the following steps that (1) normalizing treatment is conducted, specifically, the normalizing temperature is 900 DEG C, the heat preservation time is (effective thickness / 40mm) hours, and then air cooling is conducted; (2) quenching treatment is conducted, specifically, the quenching temperature is 900 DEG C, the heat preservation time is (effective thickness / 40mm) hours, and then oil cooling is conducted; (3) tempering treatment is conducted, specifically, the tempering temperature is 600 DEG C, the heat preservation time with the unit being hour is 1.5 times the quenching heat preservation time, and then air cooling is conducted; and (4) ionic nitriding treatment is conducted, specifically, ionic nitriding is conducted at the temperature of 520 DEG C for 18.0-25.0 h, furnace cooling is conducted till the temperature is lowered to be 200 DEG C, and then a product is moved out of a furnace and subjected to air cooling. The contact-fatigue strength of a workpiece treated through ionic nitriding heat treatment can be greatly improved owing to the fact that the core strength and hardness are improved.

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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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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