CN115522036A - High alloy steel rack machining process based on heat treatment - Google Patents
High alloy steel rack machining process based on heat treatment Download PDFInfo
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- CN115522036A CN115522036A CN202210950388.6A CN202210950388A CN115522036A CN 115522036 A CN115522036 A CN 115522036A CN 202210950388 A CN202210950388 A CN 202210950388A CN 115522036 A CN115522036 A CN 115522036A
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- steel rack
- treatment
- alloy steel
- high alloy
- temperature
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- Pending
Links
- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 66
- 238000010438 heat treatment Methods 0.000 title claims abstract description 32
- 238000003754 machining Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 42
- 239000010959 steel Substances 0.000 claims abstract description 42
- 238000001816 cooling Methods 0.000 claims abstract description 39
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000005496 tempering Methods 0.000 claims abstract description 24
- 238000005121 nitriding Methods 0.000 claims abstract description 23
- 238000010791 quenching Methods 0.000 claims abstract description 21
- 230000000171 quenching effect Effects 0.000 claims abstract description 21
- 238000004321 preservation Methods 0.000 claims abstract description 19
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 abstract description 3
- 239000012466 permeate Substances 0.000 abstract description 3
- 239000002344 surface layer Substances 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 7
- 229910001563 bainite Inorganic materials 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
Classifications
-
- 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
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
-
- 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
- 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
- C23C8/36—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 using ionised gases, e.g. ionitriding
- C23C8/38—Treatment 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
Abstract
The invention relates to a high alloy steel rack machining process based on heat treatment, which comprises the following steps: (1) washing treatment: immersing the high alloy steel rack in a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying; (2) quenching treatment: the quenching temperature is 820-860 ℃, and the heat preservation time is 25-60 minutes; (3) cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out; (4) tempering treatment: tempering at 150-280 deg.c for 60-120 min, and cooling to room temperature. According to the invention, nitrogen atoms can permeate into the surface layer of the steel rack by nitriding the steel rack, so that the nitrided steel rack has excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance, the wear of the steel rack in the use process can be reduced, and the use effect and the service life of the steel rack can be improved.
Description
Technical Field
The invention relates to the technical field of rack processing, in particular to a high alloy steel rack processing technology based on heat treatment.
Background
The rack is commonly used in mechanical processing equipment, can form a gear-rack mechanism together with a gear, can convert the translation of the rack into the rotation of the gear, can also convert the rotation of the gear into the translation of the rack, and is commonly used in mechanical equipment with linear motion and circumferential motion, positioning devices and the like.
The heat treatment of the material is a necessary condition for processing the steel rack, and the wear resistance of the rack is also an important factor influencing the service life of the rack besides the requirement on strength in the long-time use process, but the wear resistance of the steel rack cannot be fully improved by the heat treatment process on the market at present, so that the produced steel rack is worn after being used for a period of time, and the normal use and the service life of the rack are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a high alloy steel rack processing technology based on heat treatment, which has the following specific technical scheme:
a high alloy steel rack machining process based on heat treatment comprises the following steps:
(1) Washing treatment: immersing the high alloy steel rack into a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying in air;
(2) Quenching treatment: the quenching temperature is 820-860 ℃, and the heat preservation time is 25-60 minutes;
(3) Cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out;
(4) Tempering treatment: tempering at 150-280 deg.c for 60-120 min, and cooling to room temperature;
(5) Nitriding treatment: heating the high alloy steel rack to 500-600 ℃ in a hydrogen environment, then carrying out low-temperature plasma nitriding treatment, heating to heat the nitrided high alloy steel rack to 500-600 ℃, keeping the temperature for 3-5 hours, and cooling to room temperature.
As an improvement of the technical scheme, the low-temperature plasma nitriding treatment comprises the following steps:
(1) Putting the high alloy steel rack into a nitriding furnace, and then introducing 6Mpa nitrogen into the furnace.
As an improvement of the technical scheme, the steel material of the high alloy steel rack is selected from one of 40Cr, 42CrMo and 45 Cr.
As an improvement of the above technical solution, the cooling method in the step (4) and the step (5) is air.
As the improvement of the technical proposal, the steel material of the high alloy steel rack is 40Cr;
the quenching treatment temperature is 820-850 ℃, and the heat preservation time is 25-50 minutes;
the tempering temperature is 150-220 ℃, and the heat preservation time is 60-90 minutes.
As the improvement of the technical scheme, the steel material of the high alloy steel rack is 42CrMo;
the quenching treatment temperature is 840-860 ℃, and the heat preservation time is 35-55 minutes;
the tempering temperature is 180-240 ℃, and the heat preservation time is 70-100 minutes.
As the improvement of the technical scheme, the steel material of the high alloy steel rack is 45Cr;
the quenching treatment temperature is 840-860 ℃, and the heat preservation time is 35-60 minutes;
the tempering temperature is 220-280 ℃, and the heat preservation time is 80-120 minutes.
The invention has the beneficial effects that:
the high-alloy high rack is firstly quenched at 820-860 ℃ so as to enable super-cooled austenite inside the steel rack to be transformed into martensite or bainite to obtain martensite or bainite tissues, and then tempering is carried out, so that the rigidity, hardness, wear resistance, fatigue strength, toughness and the like of steel materials can be greatly improved, the use requirement of the rack is met, and then nitriding treatment is carried out on the steel rack so as to enable nitrogen atoms to permeate into the surface layer of the steel rack, so that the steel rack subjected to nitriding treatment has the characteristics of excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance, the abrasion of the steel rack in the use process can be reduced, the use effect and the service life of the steel rack can be improved.
Drawings
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The first embodiment is as follows: a high alloy steel rack machining process based on heat treatment comprises the following steps: (1) washing treatment: immersing the high alloy steel rack in a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying; (2) quenching treatment: the quenching temperature is 820-860 ℃, and the heat preservation time is 25-60 minutes; (3) cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out; (4) tempering treatment: tempering at 150-280 deg.c for 60-120 min, and cooling to room temperature; (5) nitriding treatment: heating the high alloy steel rack to 500-600 ℃ in a hydrogen environment, then carrying out low-temperature plasma nitriding treatment, heating to heat the nitrided high alloy steel rack to 500-600 ℃, keeping the temperature for 3-5 hours, and cooling to room temperature. The steel rack needs to be washed before heat treatment is carried out on the high alloy steel rack, the high alloy steel rack is immersed in the dilute hydrochloric acid solution, the effect of removing rust can be achieved, iron rust and other dust on the surface of steel can be fully washed off by double-frequency ultrasonic cleaning for 5-15 minutes, and then the descaling effect can be improved by rinsing with industrial citric acid. In order to transform the super-cooled austenite inside the steel rack into martensite or bainite to obtain martensite or bainite structure, the high alloy steel rack needs to be quenched at 820-860 ℃, the quenching temperature is suitable for various alloy steel materials made of different materials, and the phenomenon that the steel material is brittle and easy to crack due to insufficient hardness or overhigh temperature caused by over-low temperature can be prevented. The quenched steel rack can be rapidly cooled through oil cooling, so that the cooling time is shortened, and the next treatment is facilitated. Tempering the cooled steel rack at 150-280 deg.c to reduce the internal stress of the steel rack and raise the strength and plasticity of the steel rack, and three times of tempering to ensure the release of internal metallographic structure force. After the tempering treatment is finished, nitriding treatment is carried out on the steel rack, so that nitrogen atoms can permeate into the surface layer of the steel rack, the steel rack subjected to nitriding treatment has excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance, the wear of the steel rack in the using process can be reduced, and the using effect and the service life of the steel rack can be improved. The low-temperature plasma nitriding treatment comprises the following steps: (1) Putting the high alloy steel rack into a nitriding furnace, and then introducing 6Mpa nitrogen into the furnace. And (5) the cooling mode in the step (4) and the step (5) is air, so that the steel rack can be naturally cooled. The steel material of the high alloy steel rack is selected from one of 40Cr, 42CrMo and 45Cr, and the high strength alloy steel material is adopted because the steel rack has higher requirement on strength. The second embodiment: a high alloy steel rack machining process based on heat treatment is characterized in that steel of the high alloy steel rack is 40Cr, and the high alloy steel rack machining process comprises the following specific steps: (1) washing treatment: immersing the high alloy steel rack in a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying; (2) quenching treatment: the quenching treatment temperature is 820-850 ℃, and the heat preservation time is 25-50 minutes; (3) cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out; (4) tempering: tempering at 150-220 deg.C for 60-90 min, and cooling to room temperature; (5) nitriding treatment: heating the high alloy steel rack to 500-600 ℃ in a hydrogen environment, then carrying out low-temperature plasma nitriding treatment, heating to heat the nitrided high alloy steel rack to 500-600 ℃, keeping the temperature for 3-5 hours, and cooling to room temperature. Example three: a high alloy steel rack machining process based on heat treatment is characterized in that steel of the high alloy steel rack is 42CrMo, and the high alloy steel rack machining process comprises the following specific steps: (1) washing treatment: immersing the high alloy steel rack into a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying in air; (2) quenching treatment: the quenching treatment temperature is 840-860 ℃, and the heat preservation time is 35-55 minutes; (3) cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out; (4) tempering treatment: tempering at 180-240 deg.c for 70-100 min, and cooling to room temperature; (5) nitriding treatment: heating the high alloy steel rack to 500-600 ℃ in a hydrogen environment, then carrying out low-temperature plasma nitriding treatment, heating to heat the nitrided high alloy steel rack to 500-600 ℃, keeping the temperature for 3-5 hours, and cooling to room temperature. Example four: a high alloy steel rack machining process based on heat treatment is characterized in that steel of the high alloy steel rack is 45Cr, and the high alloy steel rack machining process comprises the following specific steps: (1) washing treatment: immersing the high alloy steel rack into a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying in air; (2) quenching treatment: the quenching treatment temperature is 840-860 ℃, and the heat preservation time is 35-60 minutes; (3) cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out; (4) tempering treatment: tempering at 220-280 deg.c for 80-120 min, and cooling to room temperature; (5) nitriding treatment: heating the high alloy steel rack to 500-600 ℃ in a hydrogen environment, then carrying out low-temperature plasma nitriding treatment, heating to heat the nitrided high alloy steel rack to 500-600 ℃, keeping the temperature for 3-5 hours, and cooling to room temperature. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A high alloy steel rack machining process based on heat treatment is characterized by comprising the following steps:
(1) Washing treatment: immersing the high alloy steel rack in a dilute hydrochloric acid solution, carrying out double-frequency ultrasonic treatment for 5-15 minutes, rinsing with industrial citric acid, and naturally drying;
(2) Quenching treatment: the quenching temperature is 820-860 ℃, and the heat preservation time is 25-60 minutes;
(3) Cooling treatment: carrying out oil cooling on the high alloy steel rack workpiece for 35-150 seconds, cooling to 550-600 ℃, and taking out;
(4) Tempering treatment: tempering at 150-280 deg.c for 60-120 min, and cooling to room temperature;
(5) Nitriding treatment: heating the high alloy steel rack to 500-600 ℃ in a hydrogen environment, then carrying out low-temperature plasma nitriding treatment, heating to heat the nitrided high alloy steel rack to 500-600 ℃, keeping the temperature for 3-5 hours, and cooling to room temperature.
2. The heat treatment-based high alloy steel rack machining process according to claim 1, characterized in that: the low-temperature plasma nitriding treatment comprises the following steps:
(1) Putting the high alloy steel rack into a nitriding furnace, and then introducing 6Mpa nitrogen into the furnace.
3. The heat treatment-based high alloy steel rack machining process according to claim 1, characterized in that: the steel material of the high alloy steel rack is selected from one of 40Cr, 42CrMo and 45 Cr.
4. The heat treatment-based high alloy steel rack machining process according to claim 1, characterized in that: and (5) cooling in the step (4) and the step (5) by air.
5. The heat treatment-based high alloy steel rack machining process of claim 3, characterized in that: the steel material of the high alloy steel rack is 40Cr;
the quenching treatment temperature is 820-850 ℃, and the heat preservation time is 25-50 minutes;
the tempering temperature is 150-220 ℃, and the heat preservation time is 60-90 minutes.
6. The heat treatment-based high alloy steel rack machining process of claim 3, characterized in that: the steel material of the high alloy steel rack is 42CrMo;
the quenching treatment temperature is 840-860 ℃, and the heat preservation time is 35-55 minutes;
the tempering temperature is 180-240 ℃, and the heat preservation time is 70-100 minutes.
7. The heat treatment-based high alloy steel rack machining process of claim 3, characterized in that: the steel material of the high alloy steel rack is 45Cr;
the quenching treatment temperature is 840-860 ℃, and the heat preservation time is 35-60 minutes;
the tempering temperature is 220-280 ℃, and the heat preservation time is 80-120 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210950388.6A CN115522036A (en) | 2022-08-09 | 2022-08-09 | High alloy steel rack machining process based on heat treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210950388.6A CN115522036A (en) | 2022-08-09 | 2022-08-09 | High alloy steel rack machining process based on heat treatment |
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| CN115522036A true CN115522036A (en) | 2022-12-27 |
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| CN202210950388.6A Pending CN115522036A (en) | 2022-08-09 | 2022-08-09 | High alloy steel rack machining process based on heat treatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299722A (en) * | 2000-12-26 | 2001-06-20 | 常州市钢筘厂 | Production process of metal rack |
| CN103774085A (en) * | 2014-01-03 | 2014-05-07 | 华南理工大学 | High-nitrogen austenite layer in low-carbon alloy steel surface preparation and preparation method thereof |
| CN105714304A (en) * | 2014-12-03 | 2016-06-29 | 重庆远煌机械制造有限公司 | 40Cr pin shaft heat treatment process |
| CN108611589A (en) * | 2018-05-07 | 2018-10-02 | 常州大学 | A kind of composite pretreatment technique improving glow discharge nitriding efficiency |
| CN109576631A (en) * | 2018-10-29 | 2019-04-05 | 山东建筑大学 | A kind of workpiece surface reinforcing new method |
| CN111118261A (en) * | 2020-03-09 | 2020-05-08 | 湖南申亿机械应用研究院有限公司 | Heat treatment process for 40CrNiMo forged pin shaft |
| CN111500970A (en) * | 2020-04-27 | 2020-08-07 | 湖州求精汽车链传动有限公司 | Carbonitriding process for chain pin shaft |
| CN112725724A (en) * | 2020-12-28 | 2021-04-30 | 厦门真冈热处理有限公司 | Nitriding method of inner gear ring of automobile gearbox |
-
2022
- 2022-08-09 CN CN202210950388.6A patent/CN115522036A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299722A (en) * | 2000-12-26 | 2001-06-20 | 常州市钢筘厂 | Production process of metal rack |
| CN103774085A (en) * | 2014-01-03 | 2014-05-07 | 华南理工大学 | High-nitrogen austenite layer in low-carbon alloy steel surface preparation and preparation method thereof |
| CN105714304A (en) * | 2014-12-03 | 2016-06-29 | 重庆远煌机械制造有限公司 | 40Cr pin shaft heat treatment process |
| CN108611589A (en) * | 2018-05-07 | 2018-10-02 | 常州大学 | A kind of composite pretreatment technique improving glow discharge nitriding efficiency |
| CN109576631A (en) * | 2018-10-29 | 2019-04-05 | 山东建筑大学 | A kind of workpiece surface reinforcing new method |
| CN111118261A (en) * | 2020-03-09 | 2020-05-08 | 湖南申亿机械应用研究院有限公司 | Heat treatment process for 40CrNiMo forged pin shaft |
| CN111500970A (en) * | 2020-04-27 | 2020-08-07 | 湖州求精汽车链传动有限公司 | Carbonitriding process for chain pin shaft |
| CN112725724A (en) * | 2020-12-28 | 2021-04-30 | 厦门真冈热处理有限公司 | Nitriding method of inner gear ring of automobile gearbox |
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