Thermal treatment technology of high-nitrogen stainless bearing steel

A technology of bearing steel and high nitrogen, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as hardness inconsistency, achieve the effect of ensuring dimensional stability, solving deformation problems and crack problems

Inactive Publication Date: 2011-01-05
LUOYANG LYC BEARING
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Problems solved by technology

However, the retained austenite content of 40Cr15Mo2VN steel is very high after the conventional heat treatment process, and the higher the retained austenite content, the greater the dimensional stability of the bearing. In order to solve this problem, we use lower quenching temperature and cryogenic treatment, but research It is found that after the quenching temperature is lowered, the hardness after quenching does not meet the product requirements, and cryogenic treatment is required. In order to prevent cracks and deformation, a pre-cooling treatment is added before cryogenic treatment

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  • Thermal treatment technology of high-nitrogen stainless bearing steel
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Embodiment Construction

[0020] The present invention is further described in detail by means of examples.

[0021] The heat treatment process of the 40Cr15Mo2VN high-nitrogen stainless bearing steel described in the present invention is: quenching→cold treatment→tempering. Processing equipment includes: ZC 2 -65 vacuum furnace, freezer (model: D-0.8) and tempered oil furnace (model: 130174). Specifically:

[0022] First use ZC 2 Preheat the 40Cr15Mo2VN workpiece in a -65 vacuum furnace. Preheat once at 650±10°C and 850±10°C. After the temperature rises to 650°C, keep it warm for 25-35 minutes, then continue to heat up to 850°C and keep it warm for 20-45 minutes. After the heat preservation is completed, the temperature is rapidly raised to the quenching temperature; the quenching temperature is 1060±10°C, and the heat preservation is 50-60 minutes; after the quenching and heat preservation is completed, the workpiece is sent from the heating chamber of the vacuum furnace to the oil quenching chamb...

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Abstract

The invention discloses a thermal treatment technology of high-nitrogen stainless bearing steel, comprising the following steps of: primarily preheating at a temperature of 650+/-10 DEG C and preserving the temperature for 25-35 min; secondarily preheating at a temperature of 850+/-10 DEG C and preserving the temperature for 20-45 min; quenching at a temperature of 1060+/-10 DEG C and preserving the temperature for 50-60 min; cooling to the room temperature after the quenching and performing cold treatment in half an hour at a temperature of -196+/-5 DEG C for 2-3 h for twice; and warming to the room temperature after the cold treatment and performing tempering immediately at a temperature of 160+/-5 DEG C for 4-4.5 h for twice. The best thermal treatment technology of 40Crl5Mo2VN high-nitrogen stainless bearing steel of the invention, which is finally determined on the basis of numerous experiments, not only effectively controls the content of the remained austenite to guarantee the size stability problem of the 40Crl5Mo2VN steel workpiece, but also solves the deformation problem and crack problem of the thermal treatment.

Description

technical field [0001] The invention belongs to the technical field of bearing heat treatment, and mainly relates to a high-nitrogen stainless bearing steel heat treatment process. Background technique [0002] At present, in addition to high fracture toughness, high contact fatigue life, and high wear resistance, the bearings used in industries with very harsh working conditions such as aerospace must also meet the requirements of salt spray, mold, and damp heat. "Three-proof" test requirements, but the traditional high-carbon chromium stainless bearing steel used in China cannot meet the performance requirements. Due to the high carbon and chromium content of high-carbon chromium stainless bearing steel (9Cr18, 9Cr18Mo), these two steels will inevitably produce large eutectic carbides, which are unevenly distributed and form bands. Most of it is precipitated on the grain boundary and cannot be eliminated during heat treatment, which often has an adverse effect on the grin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00
Inventor 于芸王明杰孙伟李昭昆龚建勋仵永刚焦晶明刘汇河
Owner LUOYANG LYC BEARING
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