CN108277451A - A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique - Google Patents
A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique Download PDFInfo
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- CN108277451A CN108277451A CN201810062449.9A CN201810062449A CN108277451A CN 108277451 A CN108277451 A CN 108277451A CN 201810062449 A CN201810062449 A CN 201810062449A CN 108277451 A CN108277451 A CN 108277451A
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- treatment
- temperature
- gcr15
- heat
- profile shafts
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
Abstract
The invention discloses a kind of GCr15 profile shafts to hold Heat-Treatment of Steel technique, is related to machine components technical field of heat treatment, includes the following steps：1) heat treatment in advance；2) carbo-nitriding；3) spheroidizing；4) normalizing；5) three sections of quenchings；6) high tempering.The heat treatment process of the present invention can improve bearing steel distribution of carbides state, improve its structural mechanics intensity, case hardness, contact fatigue and abrasion resistance properties, suitable for promoting and applying.
Description
Technical field
The present invention relates to machine components technical field of heat treatment, and in particular to a kind of GCr15 profile shafts hold Heat-Treatment of Steel work
Skill.
Background technology
GCr15 profile shafts are held in steel heat treatment process often problem appear to is that annealing speed is too fast, lead to the brittle of bearing steel
Property it is stronger, after being fabricated to bearing, due to the rotary motion of axial length phase, make what bearing undertaken to be more than only axial force, also
A part of radial load, the radial load are hit with bearing, and the situation that bearing has fracture in use for some time occurs.Again
Due in bearing steel heat treatment process, only undergo primary quenching and lonneal, make the intensity, hardness, wearability of bearing steel with
Anti-fatigue performance is relatively poor, and we have proposed a kind of bearing steel heat treatment process thus.
Invention content
For problems of the prior art, the present invention provides a kind of GCr15 profile shafts to hold Heat-Treatment of Steel technique, should
Kind heat treatment process can improve bearing steel distribution of carbides state, improve its structural mechanics intensity, case hardness, contact fatigue
And abrasion resistance properties, suitable for promoting and applying.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique, follow the steps below：
(1) heat treatment in advance：Bearing steel workpiece is placed in high-temperature vacuum furnace and homogenizes the pre-heat treatment 2.6-3.5h；
(2) carbo-nitriding：Bearing steel workpiece is warming up to 780-820 DEG C of progress carbo-nitriding processing, is oozing stage carbon by force
Gesture control is 1.10-1.25%, is 1.30-1.45% in diffusion phase carbon-potential control；700-750 DEG C is cooled to later to be protected
Temperature, holding stage carbon-potential control is in 1.10-1.20%；
(3) spheroidizing：It is 720-780 DEG C to use isothermal spheroidizing technique, nodularization heating temperature to bearing steel workpiece,
Soaking time is 1.5-2h, and 840-880 DEG C is heated to before annealing, keeps the temperature 40-50min；
(4) normalizing：By the diathermanous rear heat preservation 1.5-2h of bearing steel workpiece, water mist is cooled to 60-80 DEG C；
(5) three sections of quenchings：Bearing steel workpiece is delivered in glowing furnace and carries out quenching treatment, is divided into one section of heating, heating
Two sections and soaking zone go out glowing furnace and immerse the quenching liquid that temperature is 18-22 DEG C, cool time 60-80s after quenching；
(6) high tempering：It is 330~360 DEG C of heat preservations that workpiece after quenching treatment, which is delivered in tempering furnace in temperature,
2.5-3.5h continuing heating to be tempered；High tempering is warming up to 650~700 DEG C, keeps the temperature and is air-cooled to room with stove after 4.5-5.5h
Temperature.
Further, in step (1), the heat treatment in advance is by bearing steel workpiece with the rate of 15-25 DEG C/min
It is warming up to 480-560 DEG C, and keeps the temperature 3.2h.
Further, which is characterized in that in step (2), the strong phases-time that oozes is 1-2h；When the diffusion phase
Between be 25-35min；The holding stage time is 15-25min.
Further, in carbo-nitriding processing, nitrogen source is ammonia, and carbon source is methanol and propane.
Further, in carbo-nitriding processing, the methanol and propane are passed through in the strong stage of oozing, until holding stage knot
Stop when beam；The ammonia is passed through when diffusion phase starts, until stopping at the end of holding stage.
Further, in carbo-nitriding processing, the flow of methanol and propane is 0.8-1.2L/min, and the flow of ammonia is
1.0-2.0L/min。
Further, in carbo-nitriding processing, the volume ratio of the methanol and propane is 1:(2-4).
Further, the temperature that one section is heated in step (5), in the quenching treatment is 780-820 DEG C, the retention time
For 20-30min；The temperature of two sections of heating is 840-880 DEG C, retention time 30-40min.
Further, in step (5), the quenching liquid is using isothermal quenching oil.
The present invention has following advantageous effect：The present invention is held in conventional GCr15 profile shafts to be increased on steel heat treatment process
Heat treatment in advance and carbo-nitriding suitably adjust, improve and optimize the related ginseng of annealing, normalizing, quenching and tempering
Number so that bearing finished products steel internal structure crystal grain is uniform, and face crack is small, and various crystal are reasonably distributed, and overall performance is good；It opens
The heat treatment in advance effect that beginning uses is the spheroidizing time of bearing steel steel totality after being effectively shortened, and improves ball
Rate, in conjunction with carbo-nitriding so that carbide size and distribution are more tiny and uniform than arriving of being heat-treated of conventional spheroidizing,
Bearing steel distribution of carbides state is improved, contact fatigue and abrasion resistance properties are improved, meets bearing relevant industries to axis
Hold the high requirement of steel.In addition, the present invention suitably increases quenching times, temperature drop rate when reducing quenching reduces bearing steel
Inside and outside temperature difference avoids occurring surface fracture when quenching, improves quenching quality, and hardness and the surface abrasion resistance for improving bearing steel are strong
Degree, increases the adaptation intensity of bearing steel, and bearing steel is avoided to be distorted and surface abrasion, improves bearing holder (housing, cover) precision, reduces time
The generation of product rate, extends service life.Corresponding normalizing, three sections of quenchings and high tempering processing are then carried out, further
The intensity and hardness of bearing steel are improved, and enhances the wearability and anti-fatigue performance of bearing steel, suitable for promoting and applying.
Specific implementation mode
The specific implementation mode of the present invention is further described with reference to embodiment, following embodiment is only used for more
Technical scheme of the present invention is clearly demonstrated, and not intended to limit the protection scope of the present invention.
Embodiment 1
A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique, follow the steps below：
(1) heat treatment in advance：First bearing steel workpiece is placed in high-temperature vacuum furnace, by bearing steel workpiece with 15 DEG C/min's
Rate is warming up to 480 DEG C, and with equalizing temperature the pre-heat treatment 2.6h；
(2) carbo-nitriding：Bearing steel workpiece is warming up to 780 DEG C of progress carbo-nitriding processing, wherein nitrogen source uses ammonia
Gas, carbon source use methanol and propane, and the volume ratio of the two is 1:2, including following three phases：
Ooze the stage by force：Carbon-potential control is 1.10%, and it is 1h to ooze the time by force,
Diffusion phase：Carbon-potential control is 1.30%, diffusion time 25min,
Holding stage (700 DEG C)：Carbon-potential control in 1.10%, soaking time 15min,
In carbo-nitriding processing, above-mentioned methanol and propane are passed through in the strong stage of oozing, until stop at the end of holding stage,
During being somebody's turn to do, the flow of methanol and propane is 0.8L/min；Above-mentioned ammonia is passed through when diffusion phase starts, until holding stage
At the end of stop, should during, the flow of ammonia is 1.0L/min；
(3) spheroidizing：It is 720 DEG C to use isothermal spheroidizing technique, nodularization heating temperature to bearing steel workpiece, heat preservation
Time is 1.5h, and 840 DEG C are heated to before annealing, keeps the temperature 40min；
(4) normalizing：By the diathermanous rear heat preservation 1.5h of bearing steel workpiece, water mist is cooled to 60 DEG C；
(5) three sections of quenchings：Bearing steel workpiece is delivered in glowing furnace and carries out quenching treatment, including following three heating
Section：
One section of heating：Heating temperature is 780 DEG C, retention time 20min；
Two sections of heating：Heating temperature is 840 DEG C, retention time 30min；
Soaking zone：Heating temperature is 820 DEG C, retention time 1h；
Go out glowing furnace after quenching to immerse in the isothermal quenching oil that temperature is 18 DEG C, the cool time is set as 60s；
(6) high tempering：It is 330 DEG C of heat preservations that finally the workpiece after quenching treatment, which is delivered in tempering furnace in temperature,
2.5h continues heating and is tempered；High tempering is warming up to 650 DEG C, and being air-cooled to room temperature with stove after heat preservation 4.5h completes this hair
It is bright that Heat-Treatment of Steel technique is held to GCr15 profile shafts.
Embodiment 2
A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique, follow the steps below：
(1) heat treatment in advance：First bearing steel workpiece is placed in high-temperature vacuum furnace, by bearing steel workpiece with 20 DEG C/min's
Rate is warming up to 520 DEG C, and with equalizing temperature the pre-heat treatment 3.0h；
(2) carbo-nitriding：Bearing steel workpiece is warming up to 800 DEG C of progress carbo-nitriding processing, wherein nitrogen source uses ammonia
Gas, carbon source use methanol and propane, and the volume ratio of the two is 1:3, including following three phases：
Ooze the stage by force：Carbon-potential control is 1.15%, and it is 1.5h to ooze the time by force,
Diffusion phase：Carbon-potential control is 1.40%, diffusion time 30min,
Holding stage (720 DEG C)：Carbon-potential control in 1.15%, soaking time 20min,
In carbo-nitriding processing, above-mentioned methanol and propane are passed through in the strong stage of oozing, until stop at the end of holding stage,
During being somebody's turn to do, the flow of methanol and propane is 1.0L/min；Above-mentioned ammonia is passed through when diffusion phase starts, until holding stage
At the end of stop, should during, the flow of ammonia is 1.5L/min；
(3) spheroidizing：It is 750 DEG C to use isothermal spheroidizing technique, nodularization heating temperature to bearing steel workpiece, heat preservation
Time is 1.8h, and 860 DEG C are heated to before annealing, keeps the temperature 45min；
(4) normalizing：By the diathermanous rear heat preservation 1.8h of bearing steel workpiece, water mist is cooled to 70 DEG C；
(5) three sections of quenchings：Bearing steel workpiece is delivered in glowing furnace and carries out quenching treatment, including following three heating
Section：
One section of heating：Heating temperature is 800 DEG C, retention time 25min；
Two sections of heating：Heating temperature is 860 DEG C, retention time 35min；
Soaking zone：Heating temperature is 830 DEG C, retention time 1.5h；
Go out glowing furnace after quenching to immerse in the isothermal quenching oil that temperature is 20 DEG C, the cool time is set as 60-
80s；
(6) high tempering：It is 345 DEG C of heat preservation 3h that finally the workpiece after quenching treatment, which is delivered in tempering furnace in temperature,
Continue heating to be tempered；High tempering is warming up to 680 DEG C, keep the temperature after 5.0h with stove be air-cooled to room temperature complete it is of the invention right
GCr15 profile shafts hold Heat-Treatment of Steel technique.
Embodiment 3
A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique, follow the steps below：
(1) heat treatment in advance：First bearing steel workpiece is placed in high-temperature vacuum furnace, by bearing steel workpiece with 25 DEG C/min's
Rate is warming up to 560 DEG C, and with equalizing temperature the pre-heat treatment 3.5h；
(2) carbo-nitriding：Bearing steel workpiece is warming up to 820 DEG C of progress carbo-nitriding processing, wherein nitrogen source uses ammonia
Gas, carbon source use methanol and propane, and the volume ratio of the two is 1:4, including following three phases：
Ooze the stage by force：Carbon-potential control is 1.25%, and it is 2h to ooze the time by force,
Diffusion phase：Carbon-potential control is 1.45%, diffusion time 35min,
Holding stage (750 DEG C)：Carbon-potential control in 1.20%, soaking time 25min,
In carbo-nitriding processing, above-mentioned methanol and propane are passed through in the strong stage of oozing, until stop at the end of holding stage,
During being somebody's turn to do, the flow of methanol and propane is 1.2L/min；Above-mentioned ammonia is passed through when diffusion phase starts, until holding stage
At the end of stop, should during, the flow of ammonia is 2.0L/min；
(3) spheroidizing：It is 780 DEG C to use isothermal spheroidizing technique, nodularization heating temperature to bearing steel workpiece, heat preservation
Time is 2h, and 880 DEG C are heated to before annealing, keeps the temperature 50min；
(4) normalizing：By the diathermanous rear heat preservation 2h of bearing steel workpiece, water mist is cooled to 80 DEG C；
(5) three sections of quenchings：Bearing steel workpiece is delivered in glowing furnace and carries out quenching treatment, including following three heating
Section：
One section of heating：Heating temperature is 820 DEG C, retention time 30min；
Two sections of heating：Heating temperature is 880 DEG C, retention time 40min；
Soaking zone：Heating temperature is 840 DEG C, retention time 2h；
Go out glowing furnace after quenching to immerse in the isothermal quenching oil that temperature is 22 DEG C, the cool time is set as 60-
80s；
(6) high tempering：It is 360 DEG C of heat preservations that finally the workpiece after quenching treatment, which is delivered in tempering furnace in temperature,
3.5h continues heating and is tempered；High tempering is warming up to 700 DEG C, and being air-cooled to room temperature with stove after heat preservation 5.5h completes this hair
It is bright that Heat-Treatment of Steel technique is held to GCr15 profile shafts.
Performance detection
GCr15 type bearing finished products steel is made to above-described embodiment 1-3 and carries out performance detection, surveys its defect rate, average tensile
The performance parameters such as intensity, yield strength, hardness, are recorded in the following table 1；
Table 1
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features.All essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (9)
1. a kind of GCr15 profile shafts hold Heat-Treatment of Steel technique, which is characterized in that include the following steps：
(1) heat treatment in advance：Bearing steel workpiece is placed in high-temperature vacuum furnace and homogenizes the pre-heat treatment 2.6-3.5h；
(2) carbo-nitriding：Bearing steel workpiece is warming up to 780-820 DEG C of progress carbo-nitriding processing, is oozing stage carbon potential control by force
It is made as 1.10-1.25%, is 1.30-1.45% in diffusion phase carbon-potential control；700-750 DEG C is cooled to later to be kept the temperature,
Holding stage carbon-potential control is in 1.10-1.20%；
(3) spheroidizing：It is 720-780 DEG C to use isothermal spheroidizing technique, nodularization heating temperature to bearing steel workpiece, heat preservation
Time is 1.5-2h, and 840-880 DEG C is heated to before annealing, keeps the temperature 40-50min；
(4) normalizing：By the diathermanous rear heat preservation 1.5-2h of bearing steel workpiece, water mist is cooled to 60-80 DEG C；
(5) three sections of quenchings：Bearing steel workpiece is delivered in glowing furnace and carries out quenching treatment, is divided into one section of heating, two sections of heating
And soaking zone, glowing furnace is gone out after quenching and immerses the quenching liquid that temperature is 18-22 DEG C, cool time 60-80s；
(6) high tempering：It is 330~360 DEG C of heat preservation 2.5- that workpiece after quenching treatment, which is delivered in tempering furnace in temperature,
3.5h continues heating and is tempered；High tempering is warming up to 650~700 DEG C, keeps the temperature and is air-cooled to room temperature i.e. with stove after 4.5-5.5h
It can.
2. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in step (1)
In, the heat treatment in advance is bearing steel workpiece to be warming up to 480-560 DEG C with the rate of 15-25 DEG C/min, and keep the temperature 3.2h.
3. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in step (2)
In, the strong phases-time that oozes is 1-2h；The diffusion phase time is 25-35min；The holding stage time is 15-
25min。
4. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in carbo-nitriding
In processing, nitrogen source is ammonia, and carbon source is methanol and propane.
5. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in carbo-nitriding
In processing, the methanol and propane are passed through in the strong stage of oozing, until stopping at the end of holding stage；The ammonia is in diffusion phase
It is passed through when beginning, until stopping at the end of holding stage.
6. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in carbo-nitriding
In processing, the flow of methanol and propane is 0.8-1.2L/min, and the flow of ammonia is 1.0-2.0L/min.
7. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in carbo-nitriding
In processing, the volume ratio of the methanol and propane is 1:(2-4).
8. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in step (5)
In, the temperature that one section is heated in the quenching treatment is 780-820 DEG C, retention time 20-30min；The temperature of two sections of heating
It is 840-880 DEG C, retention time 30-40min.
9. a kind of GCr15 profile shafts according to claim 1 hold Heat-Treatment of Steel technique, which is characterized in that in step (5)
In, the quenching liquid is using isothermal quenching oil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810062449.9A CN108277451A (en) | 2018-01-23 | 2018-01-23 | A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique |
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| CN201810062449.9A CN108277451A (en) | 2018-01-23 | 2018-01-23 | A kind of GCr15 profile shafts hold Heat-Treatment of Steel technique |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110512167A (en) * | 2019-10-11 | 2019-11-29 | 江苏康达顺精密汽车附件制造有限公司 | A kind of hydraulic part Surface hardened layer carbo-nitriding heat treatment process |
| CN110684891A (en) * | 2019-11-05 | 2020-01-14 | 浙江辛子精工机械有限公司 | Induction quenching process for steel bearing part of high-carbon chromium bearing |
| CN111575453A (en) * | 2020-06-30 | 2020-08-25 | 张家港联峰钢铁研究所有限公司 | Bearing steel heat treatment process |
| CN115233151A (en) * | 2022-06-24 | 2022-10-25 | 重庆市新超力轴承有限公司 | Bearing ring heat treatment method and high-temperature-resistant bearing |
| CN116536618A (en) * | 2023-05-23 | 2023-08-04 | 江苏丰东热技术有限公司 | Novel carbonitriding process for bearing product |
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| CN106555131A (en) * | 2016-12-02 | 2017-04-05 | 机械科学研究总院青岛分院 | A kind of Super High Carbon profile shaft holds Heat-Treatment of Steel method |
| CN107201494A (en) * | 2017-06-20 | 2017-09-26 | 合肥博创机械制造有限公司 | A kind of alloy carburizing steel gear heat treatment technique |
| CN107236856A (en) * | 2017-06-28 | 2017-10-10 | 安徽华飞机械铸锻有限公司 | A kind of seamless steel pipe Technology for Heating Processing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106555131A (en) * | 2016-12-02 | 2017-04-05 | 机械科学研究总院青岛分院 | A kind of Super High Carbon profile shaft holds Heat-Treatment of Steel method |
| CN107201494A (en) * | 2017-06-20 | 2017-09-26 | 合肥博创机械制造有限公司 | A kind of alloy carburizing steel gear heat treatment technique |
| CN107236856A (en) * | 2017-06-28 | 2017-10-10 | 安徽华飞机械铸锻有限公司 | A kind of seamless steel pipe Technology for Heating Processing |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110512167A (en) * | 2019-10-11 | 2019-11-29 | 江苏康达顺精密汽车附件制造有限公司 | A kind of hydraulic part Surface hardened layer carbo-nitriding heat treatment process |
| CN110684891A (en) * | 2019-11-05 | 2020-01-14 | 浙江辛子精工机械有限公司 | Induction quenching process for steel bearing part of high-carbon chromium bearing |
| CN111575453A (en) * | 2020-06-30 | 2020-08-25 | 张家港联峰钢铁研究所有限公司 | Bearing steel heat treatment process |
| CN115233151A (en) * | 2022-06-24 | 2022-10-25 | 重庆市新超力轴承有限公司 | Bearing ring heat treatment method and high-temperature-resistant bearing |
| CN116536618A (en) * | 2023-05-23 | 2023-08-04 | 江苏丰东热技术有限公司 | Novel carbonitriding process for bearing product |
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