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Plasma nitriding heat treatment process of 35crmov gear sleeve or gear ring for centrifugal compressor
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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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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.
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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 ionnitriding 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 quenchingholding time" in hours, and then air-cooled; (4) ionnitriding treatment, ionnitriding 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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