CN101186965B - GCr15 steel bearing collar bainite isothermal quenching technique - Google Patents
GCr15 steel bearing collar bainite isothermal quenching technique Download PDFInfo
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- CN101186965B CN101186965B CN2007101931354A CN200710193135A CN101186965B CN 101186965 B CN101186965 B CN 101186965B CN 2007101931354 A CN2007101931354 A CN 2007101931354A CN 200710193135 A CN200710193135 A CN 200710193135A CN 101186965 B CN101186965 B CN 101186965B
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- gcr15 steel
- steel bearing
- bearing
- bearing collar
- isothermal
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- Rolling Contact Bearings (AREA)
Abstract
Provided is an bainite austempering process of GCr15 steel bearing rings, which firstly heats GCr15 steel bearing rings to the temperature of 870 DEG C, then the GCr15 steel bearing rings are placed in the 50% KNO3+50%NaNo2 nitrate solution to be isothermal and is taken out after four hours of isothermal time. The bearing rings treated by the technology have high tenacity and long fatigue life. In particular, the service life of the working bearings under heavy load and impulse can be prolonged and the operation reliability of the bearings can be increased.
Description
Technical field
The invention belongs to the heat treatment technics field, refer more particularly to a kind of GCr15 steel bearing collar bainite isothermal quenching technique.
Background technology
Domestic rolling mill bearing major part is with GCr15 and the manufacturing of GCr15SiMn bearing steel, adopts that conventional martensite is quenched, tempering heat treatment process.Because martensitic stucture is hard and crisp, in the thermal treatment heat-processed, the decarburization of bearing ring surface oxidation, the back of quenching forms surperficial tensile stress, transports collision at inter process the lasso cracking often takes place, and grinds to add easily to form grinding crack man-hour; Secondly, rolling mill bearing in use, the load that withstands shocks is big, working conditions is abominable, has inside and outside circle cracking of quite a few bearing and rib to rupture; Moreover the marquench workpiece deformation is big, scrap rate is high and the mill finishing allowance is big, and production causes very big waste to rolling mill bearing.
Summary of the invention
For addressing the above problem, improve rolling mill bearing work-ing life and reliability, the present invention has designed a kind of GCr15 steel bearing collar bainite isothermal quenching technique, use the bearing ring after this art breading to have high toughness and long fatigue lifetime, especially the bearing of working under heavy duty and impact can improve work-ing life and operating reliability.
For achieving the above object, the present invention adopts following technical scheme:
Described GCr15 steel bearing collar bainite isothermal quenching technique is that the GCr15 steel bearing collar is heated to 870 ℃ earlier, then the GCr15 steel bearing collar is put into 230 ℃ the 50%KNO that limits by weight percentage
3+ 50%NaNO
2Isothermal in the nitrate solution, isothermal time take out after 4 hours and get final product.
Because adopt aforesaid technical scheme, the present invention has following superiority:
1) expand the use range of making bearing ring with the GCr15 steel, greatly, part substitutes the GCr15SiMn steel.The effective thickness of bearing ring is below 12mm during general GCr15 steel marquench, but during austempering because the salt made from earth containing a comparatively high percentage of sodium chloride cooling power is strong, the bearing ring effective thickness can be extended to about 30mm, has reduced the manufacturing cost of rolling mill bearing.
2), improved the rolling mill bearing thermal treatment quality, stable, the good uniformity of the back hardness of quenching.Because bainite transformation is a slow process, bearing ring is long-time isothermal in salt made from earth containing a comparatively high percentage of sodium chloride, the surface changes with core structure and almost carries out simultaneously, therefore hardness is stable, good uniformity, hardness is at 59～61HRC behind the general GCr15 steel austempering, homogeneity≤1HRC, bigger slightly problems such as hardness is low with regard to occurring, soft spots and lack of homogeneity of bearing ring wall thickness when not resembling conventional marquench.
3), significantly reduced rolling mill bearing quenching crack and grinding crack tendency, improved mill processed finished products rate.Because bainite structure is than martensitic stucture good toughness, simultaneously the surface form up to-400～-stress of 500MPa, greatly reduced the quenching crack tendency; Add the man-hour bearing stress at mill and offset the part grinding stress, the integrated stress level is descended, significantly reduced grinding stress.
4), improved the work-ing life of rolling mill bearing.For the milling train that bears heavy shock loads, railway bearing etc., main failure forms is when using behind marquench: being hit in cover cracking, the use in during assembling, the outer ring rib falls piece, inner ring is cracked, and behind the austempering because good, the bearing stress of impelling strength, cover cracking in when no matter assembling, still the outer ring rib falls piece in the use, the inner ring fracture prone significantly reduces, GCr15 steel rolling mill bearing part is after isothermal quenching, and bearing life has improved more than 65%.
GCr15 steel bearing collar bainite isothermal quenching technique of the present invention is that the GCr15 steel bearing collar is heated to 870 ℃ earlier, then the GCr15 steel bearing collar is put into 230 ℃ the 50%KNO that limits by weight percentage
3+ 50%NaNO
2Isothermal in the nitrate solution, isothermal time take out after 4 hours and get final product.
Embodiment
GCr15 steel bearing collar of the present invention its tissue behind austempering has very high obdurability, yield strength and fracture toughness property, and impelling strength is quenched, improved 65% after the tempering than conventional martensite.Therefore, the bearing parts through means of isothermal quenching can improve the bearing life and the reliability of working under shock-resistant loading capacity and the severe environmental conditions.
The GCr15 steel bearing collar bainite isothermal quenching technique has improved the rolling mill bearing inner quality, reduced the production cost in the production process, improved the finished product rate, improved bearing work-ing life, the present invention can be widely used in bearing, economic benefit and obvious social benefit such as railway, automobile, milling train, lifting machine and drilling machine.
Claims (1)
1. GCr15 steel bearing collar bainite isothermal quenching technique, it is characterized in that: this technology is that the GCr15 steel bearing collar is heated to 870 ℃ earlier, then the GCr15 steel bearing collar is put into 230 ℃ nitrate solution isothermal, wherein KNO in the nitrate solution
3, NaNO
2Respectively accounting for weight percent is 50%, and isothermal time takes out after 4 hours and gets final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101931354A CN101186965B (en) | 2007-11-30 | 2007-11-30 | GCr15 steel bearing collar bainite isothermal quenching technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101931354A CN101186965B (en) | 2007-11-30 | 2007-11-30 | GCr15 steel bearing collar bainite isothermal quenching technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101186965A CN101186965A (en) | 2008-05-28 |
| CN101186965B true CN101186965B (en) | 2010-08-25 |
Family
ID=39479571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101931354A Expired - Fee Related CN101186965B (en) | 2007-11-30 | 2007-11-30 | GCr15 steel bearing collar bainite isothermal quenching technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101186965B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828005A (en) * | 2011-06-14 | 2012-12-19 | 瓦房店正达冶金轧机轴承有限公司 | Isothermal quenching self-shaping process for large-scale sleeve in salt bath |
| CN103143886B (en) * | 2013-02-19 | 2016-05-11 | 浙江为尚机械有限公司 | A kind of novel processing method of ball bearing |
| CN103540726B (en) * | 2013-09-25 | 2015-08-05 | 西安交通大学 | A kind of Super High Carbon profile shaft holds Heat Treatment Of Steel method |
| CN108165722A (en) * | 2017-12-29 | 2018-06-15 | 人本集团有限公司 | GCr15 bearing ring heat treatment process |
| CN108342565A (en) * | 2018-02-28 | 2018-07-31 | 武汉理工大学 | A kind of secondary quenching heat treatment process improving quenching deformation for bearing ring |
| CN108754085A (en) * | 2018-07-02 | 2018-11-06 | 洛阳Lyc轴承有限公司 | A kind of GCr15 small steels thin-wall bearing ferrule Bainitic hardening process |
| CN110106323A (en) * | 2019-05-29 | 2019-08-09 | 临清市瓦临精工轧机轴承有限公司 | A kind of GCr15SiMn steel bearing collar horse austempering method |
| CN113564320B (en) * | 2021-08-05 | 2023-03-17 | 沈阳工业大学 | Heat treatment method of G13Cr4Mo4Ni4V steel for aeroengine bearing |
| CN114480797A (en) * | 2022-01-27 | 2022-05-13 | 石狮市汇星机械有限公司 | Heat treatment process method for producing knitting machine cam by using GCr15 steel |
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2007
- 2007-11-30 CN CN2007101931354A patent/CN101186965B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN101186965A (en) | 2008-05-28 |
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Effective date of registration: 20180510 Address after: 471000 No. 1 axis research road, Jianxi science and Technology Industrial Park, Luoyang, Henan Patentee after: Luoyang Bearing Research Institute Address before: No. 1, Jilin Road, Luoyang, Henan, Henan Patentee before: Zhouyan Science and Technology Co., Ltd., Luoyang |
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