CN106637060A - Carbonitriding heat treatment technique under new atmosphere - Google Patents
Carbonitriding heat treatment technique under new atmosphere Download PDFInfo
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- CN106637060A CN106637060A CN201610911513.7A CN201610911513A CN106637060A CN 106637060 A CN106637060 A CN 106637060A CN 201610911513 A CN201610911513 A CN 201610911513A CN 106637060 A CN106637060 A CN 106637060A
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- 238000005256 carbonitriding Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 37
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 35
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 32
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000010791 quenching Methods 0.000 claims abstract description 17
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000008595 infiltration Effects 0.000 claims abstract description 14
- 238000001764 infiltration Methods 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 238000005255 carburizing Methods 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 238000005496 tempering Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000011888 foil Substances 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims description 18
- 229910021529 ammonia Inorganic materials 0.000 claims description 17
- 239000001294 propane Substances 0.000 claims description 14
- 239000003921 oil Substances 0.000 claims description 12
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000000047 product Substances 0.000 description 12
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a carbonitriding heat treatment technique under a new atmosphere. The technique comprises the following steps that (a), a multi-purpose chamber furnace suitable for carburizing treatment is selected; (b), a nitrogen, methyl alcohol, ammonia gas and dimethylmethane carburizing medium is adopted, and an oxygen probe is adopted to control the carbon potential, so that control over the carbon potential of the atmosphere in the furnace is achieved; (c), according to a charging mode, charging layers are chosen according to the heights of workpieces, and gaps are kept between the workpieces of each layer to guarantee the uniformity of infiltration layers; (d), according to technological parameters, the carbonitriding temperature is 815 DEG C-825 DEG C, the carbon potential is 1.20%-1.30%, and strong infiltration is conducted for 3 h-3.5 h; in the diffusion period, the temperature is 815 DEG C-825 DEG C, the carbon potential is 1.10%-1.20%, and diffusion is conducted for 3 h-3.5 h; KR-218 fast bright quenching oil is used for quenching, and cooling is conducted for 8 min-15min; and air cooling is conducted after tempering; and (e), steel foil is used for carbon determination during strong infiltration of each furnace. According to the carbonitriding heat treatment technique under the new atmosphere, a carbonitriding layer with a certain depth can be obtained in a relatively short time, and higher hardness is achieved.
Description
Technical field
The invention belongs to technical field of heat treatment, is related to a kind of carbo-nitriding Technology for Heating Processing of new atmosphere, more particularly to
To a kind of high-carbon-chromium bearing steel GCr15 bearing rings carbo-nitriding Technology for Heating Processing.The present invention is only applicable to bearing ring diameter
No more than 120mm, the carbo-nitriding Technology for Heating Processing under new atmosphere of bearing internal external circle of the effective thickness not less than 2.0mm.
The present invention is applied to mult-purpose chamber furnace, and carbo-nitriding process is carried out to bearing parts using this kind of new atmosphere.
Background technology
It is well known that GCr15 is a kind of most widely used high-carbon-chromium bearing steel of bearing industry, domestic and international some well-known product
The middle-size and small-size precision bearing of board or the bearing used under special operation condition, mostly by from the material, using special heat
Handling process, such as improves the case hardness and anti-wear performance of workpiece using carbo-nitriding, ultra fine process, carries
The service life of high bearing is required.Conventional GCr15 carbonitriding technology schemes：The atmosphere of methyl alcohol+ammonia+propane, CO contents
30% or so is reached, the shortcoming of this kind of scheme easily produces non-horse tissue, desmachyme, thick carbide；In in order to ensure finished product
Nothing but horse tissue, desmachyme, thick carbide etc. are organized, it is necessary to the reserved allowance of larger production, cause whole carbon nitrogen to be total to
Cycle stretch-out is oozed, the overall energy resource consumption of heat treatment is increased.And the atmosphere that the present invention intends by changing carbo-nitriding adopts nitrogen
The atmosphere of gas+methyl alcohol+ammonia+propane.
The content of the invention
In order to give full play to the potential of existing high-carbon-chromium bearing steel GCr15, conventional carbo-nitriding Technology for Heating Processing week is solved
The bad problem of phase length, economy, and non-horse tissue, desmachyme, the defect problem of thick carbide are easily produced, this
It is bright there is provided a kind of carbo-nitriding Technology for Heating Processing of new atmosphere, make the bearing ring after process that there is higher hardness, higher
Anti-wear performance and the longer life-span, improve the reliability of bearing operation,
For achieving the above object, the present invention is adopted the following technical scheme that:
A, equipment choosing can be used for the mult-purpose chamber furnace of Carburization Treatment.
B, carburizing medium：Nitrogen+methyl alcohol+ammonia+propane；Carbon potential is controlled using oxygen probe, control CO contents account for as 19%～
21%, ammonia flow is 0.30m3/ h～0.35 m3/ h, nitrogen about 3.8～4.1m3/ h, methyl alcohol about 4.1～4.5L/h, propane stream
The intake size of amount is automatically controlled using oxygen probe, realizes the control to furnace atmosphere carbon potential；
C, charging method：Fill 2 layers/disk～4 layer/disk, according to the height of workpiece select charging the number of plies, workpiece height direction with above
Charging tray diameter distance be 25mm～35mm；Separated with filter between each layer, retention gap 5mm between per layer of workpiece～
10mm ensures the uniformity of infiltration layer.
D, technological parameter：815 DEG C～825 DEG C of carbo-nitriding temperature, ammonia flow is 0.30m3/ h～0.35 m3/ h, nitrogen
About 3.8～4.1m3/ h, methyl alcohol about 4.1～4.5L/h, carbon potential：1.20%～1.30%, the time is oozed by force for 3.0h～3.5h；Diffusion
Phase temperature is 815 DEG C～825 DEG C, and ammonia flow is 0.3m3/ h～0.35 m3/ h, nitrogen about 3.8～4.1m3/ h, methyl alcohol about 4.1
～4.5L/h, carbon potential is 1.10%～1.20%；Diffusion time is 3.0h～3.5h；Quenching adopts the quick bright quenchings of KR-218
Oil, 60 DEG C～80 DEG C of oil temperature, cool time is 8～15 minutes；165 DEG C～175 DEG C of temperature, tempering time 2.5h～3h,
Then air cooling.
Carbon is determined using steel foil between e, every stove carburazing period.
Bearing ring carbo-nitriding Technology for Heating Processing of the present invention can obtain certain depth within the relatively short time
Carbonitrided case, and more rational case depth is still obtained after lasso finished product, and ensure surface and secondary table
Layer obtains higher hardness.
Because using technical scheme as above, the present invention has following superiority：
1st, a kind of new carbo-nitriding atmosphere, more suitable carbo-nitriding temperature, rational carbon potential, relatively reasonable strong is employed
Blend diffusion ratio about 1:1～1:1.2, solve traditional handicraft easily produce non-horse tissue, desmachyme, thick carbide with
And the defect such as grain boundary oxidation, it is ensured that the thermal treatment quality and end product quality of infiltration layer.Simultaneously this programme with than conventional carbo-nitriding
Technique is compared with cycle is short, and whole cycle can shorten at least 1/3 heat treatment process time；So as to realize carbo-nitriding heat
The practicality of handling process, economy and validity.Carbon-potential control is carried out using oxygen probe, it is 19%～21% to control CO contents,
And the time ratio of diffusion period being blended using rational carbon potential, ammonia allowance and by force, by no means the tissue such as horse tissue, desmachyme lacks solution
Fall into, and shorten whole Technology for Heating Processing flow process,
2nd, bearing ring carbo-nitriding Technology for Heating Processing of the present invention can obtain certain depth within the relatively short time
Carbonitrided case, and more rational case depth is still obtained after lasso finished product, and ensure surface and secondary top layer
Obtain higher hardness.There is the finished product of the PROCESS FOR TREATMENT of the present invention case hardness to be distributed in HV793～HV800, secondary table
Layer hardness is in HV798～HV809（Detected value at 0.20mm）；Case hardness after quenching is up to HV865～HV896, and general
Quench tempering bearing compare fabricated part case hardness improve 1HRC～2HRC.
3rd, the product of the PROCESS FOR TREATMENT has heat treatment deformation little, and allowance is reasonably distributed, it is ensured that the quality of finished product infiltration layer
Uniformity and the carbonitride of a large amount of small and disperseds is finally obtained, with good Technology for Heating Processing.
4th, finished product lasso superficial layer is distributed with the carboritride of a large amount of small and disperseds, and the retained austenite of acquisition is about
12.6%-25.4%, can improve the anti-wear performance of bearing.Compared with conventional martensite quenches tempering process, after this PROCESS FOR TREATMENT
Lasso there is higher toughness and longer fatigue life.And core structure does not have thick acicular martensite, center portion group
The cryptocrystalline martensite tissue crystal grain for knitting acquisition uniformity is tiny, and its grain size is 11 grades.
5th, good stress distribution, carbo-nitriding process surface of the work finished product residual stress be -408MPa～-
503MPa, the residual stress of three sample finished surfaces, paralympic, halfwidth distribution are as shown in the table.
6th, good infiltration layer distribution is obtained：After quenching layer depth be 0.60mm～0.80mm, 0.50mm～0.70mm after tempering,
Layer depth is 0.40mm～0.50mm after finished product.
7th, the infiltration layer has higher anti-temper resistance, even if being tempered at 240 DEG C higher of temperature, surface is hard
Degree remains to reach HV766, and centre hardness reaches HV709.
Specific embodiment
Embodiment 1：The carbo-nitriding Technology for Heating Processing of described new atmosphere is as follows：
（1）, equipment choosing UBE-1200 multipurpose furnaces.
（2）, carburizing medium：Nitrogen+methyl alcohol+ammonia+propane；Carbon potential is controlled using oxygen probe, control CO contents are accounted for as 20%
(carburizing medium whole content), ammonia flow is 0.32m3/ h, nitrogen about 4m3/ h, methyl alcohol about 4.4L/h, propane flow is passed through
Amount size is automatically controlled using oxygen probe, realizes the control to furnace atmosphere carbon potential；
（3）, charging method：3 layers/disk is filled, the charging number of plies, workpiece height direction and charging tray above are selected according to the height of workpiece
The distance of diameter is 30mm；Separated with filter between each layer, retention gap 6mm ensures the uniform of infiltration layer between per layer of workpiece
Property.
（4）, technological parameter：820 DEG C of carbo-nitriding temperature, carbon potential：1.25%, the time is oozed by force for 3h；Diffusion period temperature is
820 DEG C, carbon potential is 1.15%；Diffusion time is 3h；Quenching adopts the quick bright quenc hing oils of KR-218,68 DEG C of oil temperature, cool time
For 10 minutes；170 DEG C of temperature, tempering time 2.5h, then air cooling；
（5）, per determining carbon using steel foil between the stove carburazing period.
Embodiment 2：The carbo-nitriding Technology for Heating Processing of described new atmosphere is as follows：
（1）, equipment choosing UBE-1200 multipurpose furnaces.
（2）, carburizing medium：Nitrogen+methyl alcohol+ammonia+propane；Using oxygen probe control carbon potential, control CO contents account for for
19.5%, ammonia flow is 0.32m3/ h, nitrogen about 4.1m3/ h, methyl alcohol about 4.2L/h, the intake size of propane flow adopts oxygen
Probe is automatically controlled, and realizes the control to furnace atmosphere carbon potential；
（3）, charging method：3 layers/disk is filled, the charging number of plies, workpiece height direction and charging tray above are selected according to the height of workpiece
The distance of diameter is to be separated with filter between each layers of 30mm, and retention gap 6mm ensures the uniformity of infiltration layer between per layer of workpiece.
（4）, technological parameter：820 DEG C of carbo-nitriding temperature, carbon potential：1.25%, the time is oozed by force for 3h；Diffusion period temperature is
820 DEG C, carbon potential is 1.10%；Diffusion time is 3h；Quenching adopts the quick bright quenc hing oils of KR-218,68 DEG C of oil temperature, cool time
For 10 minutes；170 DEG C of temperature, tempering time 2.5h, then air cooling；
（5）, per determining carbon using steel foil between the stove carburazing period.
Carburization Treatment is carried out to model 6205E-2Z/01 and 6305E-2Z/01 bearing rings using above-mentioned process
Product have heat treatment deformation little, allowance is reasonably distributed, it is ensured that the quality uniformity of finished product infiltration layer and final obtain a large amount of
The carbonitride of small and dispersed, with good Technology for Heating Processing.Dimensional measurement feelings after 6205E-2Z/01 carbo-nitridings process
Condition is as shown in table 1 below, and allowance situation is as shown in table 2 below after 6305E-2Z/01 carbo-nitridings are processed.
The 6205E-2Z/01 carbo-nitridings of table 1 measure situation after processing
Unit：×0.01mm
Allowance situation after the 6305E-2Z/01 carbo-nitridings of table 2 process
Claims (3)
1. a kind of carbo-nitriding heat-treatment technology method of new atmosphere, is characterized in that：Its process is as follows：
A, equipment choosing can be used for the mult-purpose chamber furnace of Carburization Treatment；
B, carburizing medium：Nitrogen+methyl alcohol+ammonia+propane；Carbon potential is controlled using oxygen probe, control CO contents are accounted for as 19%～21%,
Ammonia flow is 0.30m3/ h～0.35 m3/ h, nitrogen about 3.8～4.1m3/ h, methyl alcohol about 4.1～4.5L/h, propane flow
Intake size is automatically controlled using oxygen probe, realizes the control to furnace atmosphere carbon potential；
C, charging method：Fill 2 layers/disk～4 layer/disk, according to the height of workpiece select charging the number of plies, workpiece height direction with above
Charging tray diameter distance be 25mm～35mm；Separated with filter between each layer, retention gap 5mm between per layer of workpiece～
10mm ensures the uniformity of infiltration layer；
D, technological parameter：815 DEG C～825 DEG C of carbo-nitriding temperature, carbon potential：1.20%～1.30%, ooze by force the time for 3.0h～
3.5h；Diffusion period temperature is 815 DEG C～825 DEG C, and carbon potential is 1.10%～1.20%；Diffusion time is 3.0h～3.5h；Quenching is adopted
With bright quenc hing oil, 60 DEG C～80 DEG C of oil temperature, cool time is 8～15 minutes；165 DEG C～175 DEG C of temperature, tempering time
2.5h～3h, then air cooling；
Carbon is determined using steel foil between e, every stove carburazing period.
2. a kind of carbo-nitriding heat-treatment technology method of new atmosphere according to claim 1, is characterized in that：Its is preferred
Process is as follows：
A, equipment choosing UBE-1200 multipurpose furnaces；
B, carburizing medium：Nitrogen+methyl alcohol+ammonia+propane；Carbon potential is controlled using oxygen probe, control CO contents are accounted for as 20% (carburizing
Medium whole content), ammonia flow is 0.32m3/ h, nitrogen about 4m3/ h, methyl alcohol about 4.4L/h, the intake size of propane flow
Automatically controlled using oxygen probe, realize the control to furnace atmosphere carbon potential；
C, charging method：3 layers/disk is filled, the charging number of plies is selected according to the height of workpiece, workpiece height direction is straight with charging tray above
The distance in footpath is 30mm；Separated with filter between each layer, retention gap 6mm ensures the uniformity of infiltration layer between per layer of workpiece；
D, technological parameter：820 DEG C of carbo-nitriding temperature, carbon potential：1.25%, the time is oozed by force for 3h；Diffusion period temperature is 820 DEG C, carbon
Gesture is 1.15%；Diffusion time is 3h；Quenching adopts the quick bright quenc hing oils of KR-218,68 DEG C of oil temperature, and cool time is 10 points
Clock；170 DEG C of temperature, tempering time 2.5h, then air cooling；
Carbon is determined using steel foil between e, every stove carburazing period.
3. a kind of carbo-nitriding heat-treatment technology method of new atmosphere according to claim 1, is characterized in that：Its is preferred
Process is as follows：
A, equipment choosing UBE-1200 multipurpose furnaces；
B, carburizing medium：Nitrogen+methyl alcohol+ammonia+propane；Carbon potential is controlled using oxygen probe, control CO contents are accounted for as 19.5%, ammonia
Throughput is 0.32m3/ h, nitrogen about 4.1m3/ h, methyl alcohol about 4.2L/h, the intake size of propane flow is automatic using oxygen probe
Control, realizes the control to furnace atmosphere carbon potential；
C, charging method：3 layers/disk is filled, the charging number of plies is selected according to the height of workpiece, workpiece height direction is straight with charging tray above
The distance in footpath is 30mm；Separated with filter between each layer, retention gap 6mm ensures the uniformity of infiltration layer between per layer of workpiece；
D, technological parameter：820 DEG C of carbo-nitriding temperature, carbon potential：1.25%, the time is oozed by force for 3h；Diffusion period temperature is 820 DEG C, carbon
Gesture is 1.10%；Diffusion time is 3h；Quenching adopts bright quenc hing oil, 68 DEG C of oil temperature, and cool time is 10 minutes；Temperature
170 DEG C, tempering time 2.5h, then air cooling；
Carbon is determined using steel foil between e, every stove carburazing period.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108048788A (en) * | 2017-12-27 | 2018-05-18 | 瓦房店轴承集团有限责任公司 | Tapered roller bearing ring high-carbon-chromium bearing steel carbo-nitriding heat treatment method |
| CN109182958A (en) * | 2018-11-22 | 2019-01-11 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109266999A (en) * | 2018-11-23 | 2019-01-25 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109487069A (en) * | 2018-12-31 | 2019-03-19 | 兴化东华齿轮有限公司 | A kind of heat treatment method of ring gear control heat-treatment distortion |
| CN110965014A (en) * | 2019-12-30 | 2020-04-07 | 椿中岛机械（重庆）有限公司 | Steel ball carbonitriding process |
| CN112301308A (en) * | 2020-11-03 | 2021-02-02 | 江苏丰东热处理及表面改性工程技术研究有限公司 | Carbonitriding heat treatment method and alloy part prepared by same |
| CN114427074A (en) * | 2022-01-28 | 2022-05-03 | 中国铁建重工集团股份有限公司 | Heat treatment process of high-carbon chromium bearing part |
| CN114481006A (en) * | 2020-11-13 | 2022-05-13 | 上海汽车变速器有限公司 | Carburizing method capable of adjusting nitrogen-methanol atmosphere proportion |
| 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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| CN108048788A (en) * | 2017-12-27 | 2018-05-18 | 瓦房店轴承集团有限责任公司 | Tapered roller bearing ring high-carbon-chromium bearing steel carbo-nitriding heat treatment method |
| CN109182958A (en) * | 2018-11-22 | 2019-01-11 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109266999A (en) * | 2018-11-23 | 2019-01-25 | 福泉市发隆钢构有限公司 | A kind of steel structure surface processing method |
| CN109487069A (en) * | 2018-12-31 | 2019-03-19 | 兴化东华齿轮有限公司 | A kind of heat treatment method of ring gear control heat-treatment distortion |
| CN110965014A (en) * | 2019-12-30 | 2020-04-07 | 椿中岛机械（重庆）有限公司 | Steel ball carbonitriding process |
| CN112301308A (en) * | 2020-11-03 | 2021-02-02 | 江苏丰东热处理及表面改性工程技术研究有限公司 | Carbonitriding heat treatment method and alloy part prepared by same |
| CN114481006A (en) * | 2020-11-13 | 2022-05-13 | 上海汽车变速器有限公司 | Carburizing method capable of adjusting nitrogen-methanol atmosphere proportion |
| CN114427074A (en) * | 2022-01-28 | 2022-05-03 | 中国铁建重工集团股份有限公司 | Heat treatment process of high-carbon chromium bearing part |
| CN114427074B (en) * | 2022-01-28 | 2024-01-19 | 中国铁建重工集团股份有限公司 | Heat treatment process for high-carbon chromium bearing part |
| 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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