CN111118261A - Heat treatment process for 40CrNiMo forged pin shaft - Google Patents
Heat treatment process for 40CrNiMo forged pin shaft Download PDFInfo
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- CN111118261A CN111118261A CN202010156426.1A CN202010156426A CN111118261A CN 111118261 A CN111118261 A CN 111118261A CN 202010156426 A CN202010156426 A CN 202010156426A CN 111118261 A CN111118261 A CN 111118261A
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000010438 heat treatment Methods 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 238000005242 forging Methods 0.000 claims abstract description 19
- 238000005121 nitriding Methods 0.000 claims abstract description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005496 tempering Methods 0.000 claims abstract description 13
- 238000010791 quenching Methods 0.000 claims abstract description 12
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 238000003754 machining Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- -1 nitrogen ions Chemical class 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052572 stoneware Inorganic materials 0.000 description 1
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
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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
- 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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- 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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D9/28—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for plain shafts
-
- 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
- C23C8/08—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 only one element being applied
- C23C8/24—Nitriding
- C23C8/26—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
- C21D2261/00—Machining or cutting being involved
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment process for 40CrNiMo forged pin shafts, which comprises the following steps: step S10, putting the forging blank into an electric furnace for austenitizing, then controlling the temperature of the forging blank at 650 ℃, keeping the temperature for 15 hours, and then air-cooling; step S20, roughly processing and forming the forged blank processed in the step S10 into a 40CrNiMo steel pin shaft; step S30, sequentially carrying out quenching and tempering procedures on the 40CrNiMo steel pin shaft formed in the step S20; and step S40, cleaning the surface of the 40CrNiMo steel pin shaft by using a gas oil removal method, putting the 40CrNiMo steel pin shaft into an atmosphere nitriding furnace, heating the 40CrNiMo steel pin shaft to 520 ℃ under a heating condition and keeping the temperature for 2 hours, and then continuously injecting ammonia gas and keeping the temperature for 70 hours. Compared with the prior art, the heat treatment process for the 40CrNiMo forged pin shaft can effectively improve the tensile strength and the elongation after fracture of the 40CrNiMo forged pin shaft, greatly improve the impact absorption power, meet the requirements of engineering design on high strength and small size, and further improve the safety coefficient of equipment.
Description
Technical Field
The invention relates to the technical field of heat treatment of forgings, in particular to a heat treatment process for 40CrNiMo forged pin shafts.
Background
Heat treatment refers to a hot metal working process in which a material is heated, held and cooled in the solid state to achieve a desired texture and properties. In the process of moving from the times of stoneware to the times of cupreous and ironware, the effect of heat treatment is gradually recognized.
Heat treatment of metals is one of the important processes in mechanical manufacturing, and heat treatment generally does not change the shape and overall chemical composition of the workpiece, but imparts or improves the performance properties of the workpiece by changing the microstructure inside the workpiece, or changing the chemical composition of the surface of the workpiece, as compared to other machining processes. Its feature is to improve the intrinsic quality of the workpiece, which is not normally visible to the naked eye. Therefore, in order to make the metal workpiece have the required mechanical properties, physical properties and chemical properties, besides the reasonable selection of materials and various forming processes, a heat treatment process is often indispensable.
40CrNiMo is a high-strength alloy structural steel, has higher hardenability, and is usually treated by the following steps: normalizing at 850-870 ℃ after forging, then heating to 820-840 ℃ for oil cooling quenching, and finally tempering at 540 ℃. The processing mode can obtain more balanced mechanical properties, but the tensile strength can only reach 1000Mpa-1080Mpa, the normal-temperature impact energy is about 65J, and the improvement is not large compared with 42CrMo materials.
Therefore, it is necessary to provide a new heat treatment process for a 40CrNiMo forged pin shaft, which can effectively improve the tensile strength and the elongation after fracture of the 40CrNiMo forged pin shaft, greatly improve the impact absorption power, meet the requirements of engineering design on high strength and small size, and further improve the safety coefficient of equipment to solve the technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the heat treatment process for the 40CrNiMo forged pin shaft, which can effectively improve the tensile strength and the elongation after fracture of the 40CrNiMo forged pin shaft, greatly improve the impact absorption power, meet the requirements of engineering design on high strength and small size, and further improve the safety coefficient of equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
a heat treatment process for 40CrNiMo forged pin shafts comprises the following steps:
step S10, isothermal normalizing, namely putting the forging blank into an electric furnace for austenitizing, controlling the temperature of the forging blank at 650 ℃, keeping the temperature for 15 hours, and then cooling in air;
step S20, rough machining, namely, roughly machining and forming the forged blank processed in the step S10 into a 40CrNiMo steel pin shaft;
step S30, quenching and tempering, namely sequentially carrying out quenching and tempering procedures on the 40CrNiMo steel pin shaft formed in the step S20;
and step S40, performing gas nitriding treatment, namely cleaning the surface of the 40CrNiMo steel pin shaft by using a gas deoiling method, putting the 40CrNiMo steel pin shaft into an atmosphere nitriding furnace, heating the 40CrNiMo steel pin shaft to 520 ℃ under a heating condition and keeping the temperature for 2 hours, and then continuously injecting ammonia gas and keeping the temperature for 70 hours.
Preferably, in step S40, the heating condition is to exhaust the air before the furnace temperature is raised to 150 ℃, so as to ensure that only ammonia and nitrogen are involved in the nitriding process.
Preferably, in step S40, the furnace temperature is kept at 520 ℃ in the holding stage after the 40CrNiMo steel pin shaft is heated.
Preferably, in step S20, after the forged blank is roughly formed into a 40CrNiMo steel pin shaft, the 40CrNiMo steel pin shaft is placed in an electric furnace and heated to 850 ℃ and kept for 3 hours, and then the heating is turned off to cool the 40CrNiMo steel pin shaft to 610 ℃ along with the electric furnace and kept.
Preferably, the heating time of the 40CrNiMo steel pin shaft in the electric furnace is 50-70 min.
Preferably, in the step S30, the quenching step is to keep the 40CrNiMo steel pin at 610 ℃ for 45min, and then to take out of the furnace for oil cooling.
Preferably, the tempering procedure is to keep the 40CrNiMo steel pin shaft at 560 ℃ for 5h, and then air cooling is carried out.
Preferably, in step S10, the forged blanks are distributed at intervals in the electric furnace and are located on the same plane.
Preferably, the austenitizing condition of the forged blank is that the forged blank is heated to 900 ℃ at a constant speed in the electric furnace and then is kept for 8 hours.
In summary, compared with the prior art, the invention has the following beneficial effects: by adding the gas nitriding treatment process after the tempering process, the 40CrNiMo forged pin shaft processed by the process can obtain higher surface hardness and wear resistance; the processing steps of a 40CrNiMo forged pin shaft in the prior art are further optimized, and particularly, the yield strength of the 1/2d position of the 40CrNiMo forged pin shaft processed by adopting the heat treatment process provided by the invention is not lower than 1100Mpa, the hardness is not lower than HRC37, the normal-temperature impact energy is not less than 70J, the yield strength of the core part is not lower than 1080Mpa, the hardness is not lower than HRC35, the normal-temperature impact energy is not less than 65J, the surface hardness is not less than 700HV, the performances are superior to those of similar products in the market, namely, a workpiece processed by adopting the process has better tensile strength, elongation after fracture, higher impact absorption energy and equipment safety coefficient.
Drawings
FIG. 1 is a sampling test chart of a 40CrNiMo forged piece after rough turning round bar treatment by applying the heat treatment process of the 40CrNiMo forged pin shaft provided by the invention;
FIG. 2 is a block diagram of a heat treatment process for 40CrNiMo forged pin shafts provided by the invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples. The following experimental examples and examples are intended to further illustrate but not limit the invention.
Referring to fig. 2, the invention provides a heat treatment process for 40CrNiMo forged pin shafts, and specifically includes the following steps:
step S10, isothermal normalizing, namely putting the forging blank into an electric furnace for austenitizing, controlling the temperature of the forging blank at 650 ℃, keeping the temperature for 15 hours, and then cooling in air; to obtain more austenitic structure.
The plurality of forging blanks are distributed in the electric furnace at intervals and are positioned on the same plane, and it is noted that when the plurality of forging blanks are placed into the electric furnace at the same time, the distance between the adjacent forging blanks is required to be larger than the diameter of a single forging blank, and the forging blanks cannot be stacked.
Austenitizing the forging blank is carried out in an electric furnace at a constant speed, raising the temperature to 900 ℃, and then keeping for 8 hours.
The method is mainly used for refining grains, homogenizing tissues and eliminating internal stress of the forging stock, and improving the overheating defects and banded tissues of the material such as coarse grains, and is prepared for the subsequent processes.
Step S20, rough machining, namely, roughly machining and forming the forged blank processed in the step S10 into a 40CrNiMo steel pin shaft;
specifically, after the forging blank is processed and formed into the 40CrNiMo steel pin shaft, the 40CrNiMo steel pin shaft is placed into an electric furnace again and heated to 850 ℃ and kept for 3 hours, and then the heating is closed, so that the 40CrNiMo steel pin shaft is cooled to 610 ℃ along with the electric furnace and kept. Through the steps, the 40CrNiMo steel pin shaft after rough machining is heated thoroughly, and normal operation of subsequent processes is guaranteed.
It should be noted that the heating time of the 40CrNiMo steel pin shaft in the electric furnace needs to be ensured to be 50min-70 min. In the embodiment, the heating time of the 40CrNiMo steel pin shaft in the electric furnace is 60 min.
Step S30, quenching and tempering, namely sequentially carrying out quenching and tempering procedures on the 40CrNiMo steel pin shaft formed in the step S20;
specifically, the quenching procedure is to keep the 40CrNiMo steel pin shaft at 610 ℃ for 45min and then take the pin shaft out of the furnace for oil cooling; and the tempering procedure is to keep the 40CrNiMo steel pin shaft at 560 ℃ for 5h, and then air-cooling. Thereby ensuring the full quenching and the full back penetration of the 40CrNiMo steel pin shaft.
And step S30, through the optimized temperature curve, the 40CrNiMo steel pin shaft obtains a uniform internal structure, and the overall strength and hardness of the 40CrNiMo steel pin shaft are improved.
And step S40, performing gas nitriding treatment, namely cleaning the surface of the 40CrNiMo steel pin shaft by using a gas deoiling method, putting the 40CrNiMo steel pin shaft into an atmosphere nitriding furnace, heating the 40CrNiMo steel pin shaft to 520 ℃ under a heating condition, keeping the temperature for 2 hours, and then continuously injecting ammonia gas and keeping the temperature of 520 ℃ for 70 hours so as to ensure that nitrogen ions are fully permeated.
It should be noted that, during the heating process using the atmosphere nitriding furnace, only ammonia gas and nitrogen gas should be ensured to participate in the nitriding process. On one hand, the device can prevent the ammonia gas from decomposing and contacting with the air to generate explosive gas, and on the other hand, the device can prevent the surface of the 40CrNiMo steel pin shaft from being oxidized.
Specifically, in this embodiment, the heating condition is that nitrogen is introduced to exhaust the air in the furnace before the furnace temperature is raised to 150 ℃, so as to ensure that only ammonia and nitrogen are involved in the nitriding treatment.
In the holding stage after the 40CrNiMo steel pin shaft is heated, the temperature of the 40CrNiMo steel pin shaft and the furnace temperature need to be kept at 520 ℃, and ammonia gas is continuously injected to keep the positive pressure in the furnace. And after keeping 70H, turning off a power supply to slowly reduce the temperature of the 40CrNiMo steel pin shaft and the furnace temperature, and opening the furnace when the furnace temperature is reduced to below 150 ℃.
Through setting up this step, further improve the surface hardness of 40CrNiMo steel round pin axle promotes wear resistance.
The invention also provides a group of experimental examples, and please refer to fig. 1 and table 2 specifically, fig. 1 is a sampling test chart of a 40CrNiMo forged piece roughly turned round bar (phi 140 x 175mm) processed by applying the heat treatment process of the 40CrNiMo forged pin shaft provided by the invention; table 1 shows the rough-turned round bar core position L0 point test data; table 2 is 1/2d position L1 point test data.
Watch 1
Watch two
The graph shows that the 40CrNiMo forged pin shaft produced by the heat treatment process of the 40CrNiMo forged pin shaft has excellent mechanical properties, the yield strength at 1/2d is not lower than 1100MPa, the hardness is not lower than HRC37, the normal-temperature impact energy is not less than 70J, the yield strength at the core part is not lower than 1080MPa, the hardness is not lower than HRC35, the normal-temperature impact energy is not less than 65J, the surface hardness is not less than 700HV, and the performance is obviously superior to that of similar products in the market.
Compared with the prior art, the invention has the following beneficial effects: by adding the gas nitriding treatment process after the tempering process, the 40CrNiMo forged pin shaft processed by the process can obtain higher surface hardness and wear resistance; the processing steps of a 40CrNiMo forged pin shaft in the prior art are further optimized, and particularly, the yield strength of the 1/2d position of the 40CrNiMo forged pin shaft processed by adopting the heat treatment process provided by the invention is not lower than 1100Mpa, the hardness is not lower than HRC37, the normal-temperature impact power is not less than 70J, the yield strength of the core part is not lower than 1080Mpa, the hardness is not lower than HRC35, the normal-temperature impact power is not less than 65J, the surface hardness is not less than 700HV, the performances are superior to those of similar products in the market, namely, a workpiece processed by adopting the process has better tensile strength, elongation after fracture and equipment safety coefficient.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several improvements and modifications without departing from the principle of the present invention will occur to those skilled in the art, and such improvements and modifications should also be construed as within the scope of the present invention.
Claims (9)
1. A heat treatment process for 40CrNiMo forged pin shafts is characterized by comprising the following steps:
step S10, isothermal normalizing, namely putting the forging blank into an electric furnace for austenitizing, controlling the temperature of the forging blank at 650 ℃, keeping the temperature for 15 hours, and then cooling in air;
step S20, rough machining, namely, roughly machining and forming the forged blank processed in the step S10 into a 40CrNiMo steel pin shaft;
step S30, quenching and tempering, namely sequentially carrying out quenching and tempering procedures on the 40CrNiMo steel pin shaft formed in the step S20;
and step S40, performing gas nitriding treatment, namely cleaning the surface of the 40CrNiMo steel pin shaft by using a gas deoiling method, putting the 40CrNiMo steel pin shaft into an atmosphere nitriding furnace, heating the 40CrNiMo steel pin shaft to 520 ℃ under a heating condition and keeping the temperature for 2 hours, and then continuously injecting ammonia gas and keeping the temperature for 70 hours.
2. The heat treatment process for 40CrNiMo forged pin shafts as claimed in claim 1, wherein in step S40, the heating condition is that the furnace air is exhausted before the furnace temperature is raised to 150 ℃, so that only ammonia and nitrogen are ensured to be used as the gases participating in the nitriding process.
3. The heat treatment process for 40CrNiMo forged pin shafts according to claim 1, wherein in the step S40, the furnace temperature is kept at 520 ℃ in the holding stage after the 40CrNiMo steel pin shafts are heated.
4. The heat treatment process for 40CrNiMo forged pins according to claim 1, wherein in step S20, after the forging blank is roughly processed and formed into 40CrNiMo steel pins, the 40CrNiMo steel pins are placed in an electric furnace and heated to 850 ℃ and kept for 3h, and then the heating is turned off to cool the 40CrNiMo steel pins to 610 ℃ along with the electric furnace and kept.
5. The heat treatment process for the 40CrNiMo forged pin shaft according to claim 4, wherein the heating time of the 40CrNiMo steel pin shaft in the electric furnace is 50-70 min.
6. The heat treatment process of the 40CrNiMo forged pin shaft as claimed in claim 4, wherein in the step S30, the quenching process is to keep the 40CrNiMo steel pin shaft at 610 ℃ for 45min and then take out of the furnace for oil cooling.
7. The heat treatment process for the 40CrNiMo forged pin shaft according to claim 6, wherein the tempering procedure is to keep the 40CrNiMo steel pin shaft at 560 ℃ for 5 hours and then cool the pin shaft in air.
8. The heat treatment process for 40CrNiMo forged pin shafts according to claim 1, wherein in step S10, a plurality of forged blanks are distributed at intervals in the electric furnace and are in the same plane.
9. The heat treatment process of a 40CrNiMo forged pin shaft according to claim 8, wherein the condition for austenitizing the forged blank is that the temperature is uniformly raised to 900 ℃ in the electric furnace and then is kept for 8 hours.
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| CN202010156426.1A CN111118261A (en) | 2020-03-09 | 2020-03-09 | Heat treatment process for 40CrNiMo forged pin shaft |
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| CN202010156426.1A CN111118261A (en) | 2020-03-09 | 2020-03-09 | Heat treatment process for 40CrNiMo forged pin shaft |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375882A (en) * | 2020-11-19 | 2021-02-19 | 太原理工大学 | Heat treatment process for improving strength of flexible gear 40CrNiMo steel |
| CN115522036A (en) * | 2022-08-09 | 2022-12-27 | 合肥九米传动技术有限公司 | High alloy steel rack machining process based on heat treatment |
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| CN109290162A (en) * | 2018-11-05 | 2019-02-01 | 张盼 | A kind of wear-resisting oscillation ring and preparation method thereof for pneumatic high-frequency excitation equipment |
Cited By (2)
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| CN112375882A (en) * | 2020-11-19 | 2021-02-19 | 太原理工大学 | Heat treatment process for improving strength of flexible gear 40CrNiMo steel |
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