CN106555040A - A kind of Technology for Heating Processing for improving bearing steel toughness - Google Patents
A kind of Technology for Heating Processing for improving bearing steel toughness Download PDFInfo
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- CN106555040A CN106555040A CN201611096426.7A CN201611096426A CN106555040A CN 106555040 A CN106555040 A CN 106555040A CN 201611096426 A CN201611096426 A CN 201611096426A CN 106555040 A CN106555040 A CN 106555040A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of Technology for Heating Processing for improving bearing steel toughness, comprises the following steps：S1, annealing：Steel are incubated 4 6h at 880 1000 DEG C, and temperature is cooled to 800 860 DEG C with the speed of 25 45 DEG C/h, be incubated 1 2h, then temperature is cooled to 600 700 DEG C with the speed of 20 30 DEG C/h, air cooling of coming out of the stove after 1 2h of insulation；S2, normalizing：Temperature in stove is risen to into 750 820 DEG C, steel are put into, 2 4h, air cooling of coming out of the stove is incubated；S3, quenching：Under nitrogen protection, after steel are incubated 1 2h at a temperature of 1,000 1100 DEG C, cool down in 100 220 DEG C of oil of quenching rapidly so that distribution of carbides is uniform, take out when steel temperature is down to 150 180 DEG C, subsequent air cooling；S4, a freezing processing：By the steel of S3 at a temperature of 73 DEG C 1 2h of cold treatment；S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 150 170 DEG C, be incubated 1 3h.Bearing steel degree of purity prepared by the present invention is higher, and the amount of inclusions is few, and carbide is tiny and disperse, and size uniform, and toughness is significantly improved.
Description
Technical field
The present invention relates to bearing steel technical field of heat treatment, more particularly to a kind of heat treatment work for improving bearing steel toughness
Skill.
Background technology
Bearing steel is the steel for manufacturing ball, roller and bearing ring.Bearing steel has a height and uniform hardness and wear-resisting
Property, and high elastic limit.The content of uniformity, non-metallic inclusion to the chemical composition of bearing steel and distribution, carbonization
Distribution of thing etc. is required all very strictly, is to require one of most stringent of steel grade during all iron and steel are produced.
The physical property of bearing steel is mainly based on inspection microstructure decarburized layer, non-metallic inclusion, macrostructure.
Generally delivered goods with hot-roll annealing, cold drawn annealing.The condition of delivery should be indicated in contract.The macrostructure of steel is necessary
Without shrinkage cavity, rimhole, white point and microscopic pores.Center porosity, General Loosen must not exceed 1.5 grades, and segregation must not exceed 2
Level.The annealed structure of steel should be equally distributed acinous pearlite.Decarburized layer deepness, non-metallic inclusion and carbide are not
The uniformity should meet corresponding the countries concerned's standard regulation.
Existing bearing steel in heat treatment process, due to the difference of processing mode, the skewness of carbide,
The performance for easilying lead to bearing steel is affected, and existing bearing steel toughness need to be improved, with external bearing steel also
There is a certain distance, a kind of Technology for Heating Processing for improving bearing steel toughness is we have proposed for this, for solving the above problems.
The content of the invention
Based on the technical problem that background technology is present, the present invention proposes a kind of heat treatment work for improving bearing steel toughness
Skill.
A kind of Technology for Heating Processing for improving bearing steel toughness proposed by the present invention, comprises the following steps：
S1, annealing：Steel are incubated 4-6h at 880-1000 DEG C, and temperature is cooled to 800-860 DEG C with the speed of 25-45 DEG C/h, protect
Warm 1-2h, then temperature is cooled to into 600-700 DEG C with the speed of 20-30 DEG C/h, air cooling of coming out of the stove after insulation 1-2h；
S2, normalizing：Temperature in stove is risen to into 750-820 DEG C, steel are put into, 2-4h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, after steel are incubated 1-2h at a temperature of 1000-1100 DEG C, quenched into 100-220 DEG C rapidly
Oil in cool down so that distribution of carbides is uniform, takes out, subsequent air cooling when steel temperature is down to 150-180 DEG C；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 1-2h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 150-170 DEG C, be incubated 1-3h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 1-2h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 170-190 DEG C, insulation 1-2h can be complete after taking out
Into bearing Heat-Treatment of Steel.
Preferably, the oil is machine oil, bobbin oil, transformer oil or diesel oil.
Preferably, in the S1, steel are incubated 5h at 940 DEG C, and temperature is cooled to 830 DEG C with the speed of 35 DEG C/h, are incubated
1.5h, then temperature is cooled to into 650 DEG C with the speed of 25 DEG C/h, air cooling of coming out of the stove after insulation 1.5h.
Preferably, after in the S3, under nitrogen protection, steel are incubated 1.5h at a temperature of 1050 DEG C, quenched into 150 rapidly
DEG C oil in cool down so that distribution of carbides is uniform, takes out, subsequent air cooling when steel temperature is down to 165 DEG C.
Preferably, in the bearing steel, carbon element content is 0.8-1.4%.
Preferably, in the bearing steel, carbon element content is 1.1%.
In the present invention, first steel are carried out annealing, normalizing operation, and strict demand is made to its temperature and time, afterwards
Under nitrogen protection, steel are incubated so that distribution of carbides is uniform, and secondary freezing processing and secondary returning has been repeated
Fire, improves the obdurability of material, effectively alleviates the stress concentration of crack tip, and delays or terminate the extension of crackle,
Improve the fatigue life of bearing steel, bearing steel degree of purity prepared by the present invention is higher, and the amount of inclusions is few, carbide it is tiny and
Disperse, and size uniform, toughness are significantly improved.
Specific embodiment
The present invention is further explained with reference to specific embodiment.
Embodiment one
A kind of Technology for Heating Processing for improving bearing steel toughness proposed by the present invention, comprises the following steps：
S1, annealing：Steel 880 DEG C be incubated 4h, temperature is cooled to into 800 DEG C with the speed of 25 DEG C/h, be incubated 1h, then by temperature with
The speed of 20 DEG C/h is cooled to 600 DEG C, air cooling of coming out of the stove after insulation 1h；
S2, normalizing：Temperature in stove is risen to into 750 DEG C, steel are put into, 2h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, after steel are incubated 1h at a temperature of 1000 DEG C, cool down in 100 DEG C of oil of quenching rapidly,
So that distribution of carbides is uniform, take out when steel temperature is down to 150 DEG C, subsequent air cooling；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 1h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 150 DEG C, be incubated 1-3h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 1h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 170 DEG C, insulation 1h can complete bearing after taking out
Heat-Treatment of Steel.
Embodiment two
A kind of Technology for Heating Processing for improving bearing steel toughness proposed by the present invention, comprises the following steps：
S1, annealing：Steel are incubated 4.5h at 900 DEG C, and temperature is cooled to 810 DEG C with the speed of 30 DEG C/h, are incubated 1.2h, then by temperature
Degree is cooled to 625 DEG C with the speed of 22 DEG C/h, insulation 1.Come out of the stove after 2h air cooling；
S2, normalizing：Temperature in stove is risen to into 770 DEG C, steel are put into, 2.5h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, it is after steel are incubated 1.2h at a temperature of 1025 DEG C, cold in 120 DEG C of oil of quenching rapidly
But so that distribution of carbides is uniform, take out when steel temperature is down to 160 DEG C, subsequent air cooling；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 1.2h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 155 DEG C, be incubated 1.5h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 1.2h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 175 DEG C, insulation 1.2h can complete axle after taking out
Hold Heat-Treatment of Steel.
Embodiment three
A kind of Technology for Heating Processing for improving bearing steel toughness proposed by the present invention, comprises the following steps：
S1, annealing：Steel are incubated 5h at 920 DEG C, and temperature is cooled to 830 DEG C with the speed of 35 DEG C/h, are incubated 1.5h, then by temperature
It is cooled to 650 DEG C with the speed of 25 DEG C/h, air cooling of coming out of the stove after insulation 1.5h；
S2, normalizing：Temperature in stove is risen to into 780 DEG C, steel are put into, 3h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, it is after steel are incubated 1.5h at a temperature of 1050 DEG C, cold in 170 DEG C of oil of quenching rapidly
But so that distribution of carbides is uniform, take out when steel temperature is down to 170 DEG C, subsequent air cooling；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 1.5h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 160 DEG C, be incubated 2h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 1.5h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 180 DEG C, insulation 1.5h can complete axle after taking out
Hold Heat-Treatment of Steel.
Example IV
A kind of Technology for Heating Processing for improving bearing steel toughness proposed by the present invention, comprises the following steps：
S1, annealing：Steel are incubated 5.5h at 930 DEG C, and temperature is cooled to 850 DEG C with the speed of 40 DEG C/h, are incubated 1.8h, then by temperature
Degree is cooled to 680 DEG C with the speed of 28 DEG C/h, air cooling of coming out of the stove after insulation 1.8h；
S2, normalizing：Temperature in stove is risen to into 800 DEG C, steel are put into, 3.8h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, it is after steel are incubated 1.8h at a temperature of 1075 DEG C, cold in 200 DEG C of oil of quenching rapidly
But so that distribution of carbides is uniform, take out when steel temperature is down to 170 DEG C, subsequent air cooling；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 1.8h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 165 DEG C, be incubated 2.5h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 1.8h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 185 DEG C, insulation 1.8h can complete axle after taking out
Hold Heat-Treatment of Steel.
Embodiment five
A kind of Technology for Heating Processing for improving bearing steel toughness proposed by the present invention, comprises the following steps：
S1, annealing：Steel are incubated 6h at 1000 DEG C, and temperature is cooled to 860 DEG C with the speed of 45 DEG C/h, are incubated 2h, then by temperature
It is cooled to 700 DEG C with the speed of 30 DEG C/h, air cooling of coming out of the stove after insulation 2h；
S2, normalizing：Temperature in stove is risen to into 820 DEG C, steel are put into, 4h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, after steel are incubated 2h at a temperature of 1100 DEG C, cool down in 220 DEG C of oil of quenching rapidly,
So that distribution of carbides is uniform, take out when steel temperature is down to 180 DEG C, subsequent air cooling；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 2h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 170 DEG C, be incubated 1-3h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 2h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 190 DEG C, insulation 1-2h can complete axle after taking out
Hold Heat-Treatment of Steel.
In order to check the mechanical property of the bearing steel of the present invention, embodiment 1-5 in the present invention is detected respectively by experiment
Common bearing steel on bearing steel, and scrutineer market, as a result such as following table:
| Group | HRC | Impulsive force/J |
| Embodiment one | 59.1 | 10.2 |
| Embodiment two | 61.8 | 11.4 |
| Embodiment three | 62.5 | 12.2 |
| Example IV | 61.3 | 11.1 |
| Embodiment five | 59.5 | 10.3 |
| Plain bearing steel | 51.1 | 5.5 |
As seen from the above table, the Bearing Steel and toughness that prepared by the present invention is above common bearing steel, and toughness is significantly carried
It is high.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept equivalent or change in addition, should all be included within the scope of the present invention.
Claims (6)
1. it is a kind of improve bearing steel toughness Technology for Heating Processing, it is characterised in that comprise the following steps：
S1, annealing：Steel are incubated 4-6h at 880-1000 DEG C, and temperature is cooled to 800-860 DEG C with the speed of 25-45 DEG C/h, protect
Warm 1-2h, then temperature is cooled to into 600-700 DEG C with the speed of 20-30 DEG C/h, air cooling of coming out of the stove after insulation 1-2h；
S2, normalizing：Temperature in stove is risen to into 750-820 DEG C, steel are put into, 2-4h, air cooling of coming out of the stove is incubated；
S3, quenching：Under nitrogen protection, after steel are incubated 1-2h at a temperature of 1000-1100 DEG C, quenched into 100-220 DEG C rapidly
Oil in cool down so that distribution of carbides is uniform, takes out, subsequent air cooling when steel temperature is down to 150-180 DEG C；
S4, a freezing processing：By the steel of S3 at a temperature of -73 DEG C cold treatment 1-2h；
S5, is once tempered：Steel are put into into tempering furnace, tempering furnace is warming up to into 150-170 DEG C, be incubated 1-3h；
S6, secondary freezing processing：By the steel in S5 at a temperature of -83 DEG C cold treatment 1-2h；
S7, double tempering：Steel are put into into tempering furnace, tempering furnace is warming up to into 170-190 DEG C, insulation 1-2h can be complete after taking out
Into bearing Heat-Treatment of Steel.
2. it is according to claim 1 it is a kind of improve bearing steel toughness Technology for Heating Processing, it is characterised in that it is described oil be machine
Oil, bobbin oil, transformer oil or diesel oil.
3. it is according to claim 1 it is a kind of improve bearing steel toughness Technology for Heating Processing, it is characterised in that in the S1,
Steel are incubated 5h at 940 DEG C, and temperature is cooled to 830 DEG C with the speed of 35 DEG C/h, are incubated 1.5h, then by temperature with the speed of 25 DEG C/h
Degree is cooled to 650 DEG C, air cooling of coming out of the stove after insulation 1.5h.
4. it is according to claim 1 it is a kind of improve bearing steel toughness Technology for Heating Processing, it is characterised in that in the S3,
Under nitrogen protection, after steel are incubated 1.5h at a temperature of 1050 DEG C, cool down in 150 DEG C of oil of quenching rapidly so that carbide
It is evenly distributed, takes out when steel temperature is down to 165 DEG C, subsequent air cooling.
5. it is according to claim 1 it is a kind of improve bearing steel toughness Technology for Heating Processing, it is characterised in that the bearing steel
Middle carbon element content is 0.8-1.4%.
6. it is according to claim 5 it is a kind of improve bearing steel toughness Technology for Heating Processing, it is characterised in that the bearing steel
Middle carbon element content is 1.1%.
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| CN201611096426.7A CN106555040A (en) | 2016-12-02 | 2016-12-02 | A kind of Technology for Heating Processing for improving bearing steel toughness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018103079A1 (en) * | 2016-12-09 | 2018-06-14 | 机械科学研究总院青岛分院有限公司 | Heat treatment process for increasing resilience of bearing steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226253A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | Carburized bearing steel for high-speed railways and preparation method thereof |
| CN103173690A (en) * | 2013-04-16 | 2013-06-26 | 牛加伟 | Wear-resistant bearing steel and heat treatment method thereof |
| CN105603329A (en) * | 2016-01-09 | 2016-05-25 | 钢铁研究总院 | High-carbon and high-strength-and-toughness tungsten-molybdenum composite secondary hardening stainless bearing steel and preparation method |
-
2016
- 2016-12-02 CN CN201611096426.7A patent/CN106555040A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226253A (en) * | 2011-06-10 | 2011-10-26 | 钢铁研究总院 | Carburized bearing steel for high-speed railways and preparation method thereof |
| CN103173690A (en) * | 2013-04-16 | 2013-06-26 | 牛加伟 | Wear-resistant bearing steel and heat treatment method thereof |
| CN105603329A (en) * | 2016-01-09 | 2016-05-25 | 钢铁研究总院 | High-carbon and high-strength-and-toughness tungsten-molybdenum composite secondary hardening stainless bearing steel and preparation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018103079A1 (en) * | 2016-12-09 | 2018-06-14 | 机械科学研究总院青岛分院有限公司 | Heat treatment process for increasing resilience of bearing steel |
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Address after: Jiaozhou City, Shandong province 266300 Qingdao City Huiying economic and Technological Development Zone, South First Street Applicant after: Qingdao Branch Co., Ltd. of Mechanical Science Research Institute Address before: Jiaozhou City, Shandong province 266300 Qingdao City Huiying economic and Technological Development Zone, South First Street Applicant before: Qingdao Branch of China Academy of Machinery Science and Technology |
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Application publication date: 20170405 |