CN115044861B - Micro-carbonitriding process for medium carbon alloy steel precise fastener - Google Patents
Micro-carbonitriding process for medium carbon alloy steel precise fastener Download PDFInfo
- Publication number
- CN115044861B CN115044861B CN202210733770.1A CN202210733770A CN115044861B CN 115044861 B CN115044861 B CN 115044861B CN 202210733770 A CN202210733770 A CN 202210733770A CN 115044861 B CN115044861 B CN 115044861B
- Authority
- CN
- China
- Prior art keywords
- carbonitriding
- fastener
- fastener material
- placing
- micro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005256 carbonitriding Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 56
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 229910001339 C alloy Inorganic materials 0.000 title claims abstract description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 110
- 238000005238 degreasing Methods 0.000 claims description 34
- 238000004140 cleaning Methods 0.000 claims description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 24
- 239000013527 degreasing agent Substances 0.000 claims description 24
- 238000005237 degreasing agent Methods 0.000 claims description 24
- 239000007864 aqueous solution Substances 0.000 claims description 23
- 239000003915 liquefied petroleum gas Substances 0.000 claims description 19
- 238000005496 tempering Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000003054 catalyst Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 15
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 14
- 238000003892 spreading Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000003421 catalytic decomposition reaction Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 2
- 238000006297 dehydration reaction Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 8
- 238000005406 washing Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000006032 tissue transformation Effects 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
- C23C8/08—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
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
-
- 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
- C23C8/02—Pretreatment of the material to be coated
-
- 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
- C23C8/80—After-treatment
Abstract
The application discloses a micro carbonitriding process of a medium carbon alloy steel precise fastener, which belongs to the technical field of metal treatment, and in the carbonitriding process, the temperature, the carbon concentration and the ammonia flow are reasonably controlled, so that the precise fastener is prevented from being broken on the premise of ensuring higher mechanical property, the cost is reduced, the time is shortened, and the carbonitriding process is mainly aimed at carbonitriding of the precise fastener with the outer diameter of M0.8-M1.2 mm, so that the breakage phenomenon of the precise fastener can be effectively avoided.
Description
Technical Field
The application relates to the technical field of metal treatment, in particular to a micro-carbonitriding process of a medium carbon alloy steel precise fastener.
Background
With the rapid development of the fastener industry and the increasing market competition, the requirements of customers on the quality of fastener products such as light weight, environmental protection, long service life and the like are continuously improved, and the treatment process is required to continuously adapt to the market demands and continuously develop.
Carbonitriding is a chemical heat treatment process that mainly involves carburization while simultaneously introducing nitrogen. The method overcomes the defects that the hardness of the nitriding layer is high but the carburized layer is shallow, and the hardness of the carburized layer is large but the surface hardness is low to a certain extent.
In the prior art, according to the traditional carburizing process, the temperature of the medium carbon alloy steel precise fastener is 900-930 ℃, the carbon concentration is 1.0-1.6%, the time is more than 1H, and the Vickers hardness is used for measuring the core part 430-490HV and the tooth part 550HV. The traditional process is easy to cause that a carburized layer of a small outer diameter of the precise fastener is too deep within the range of M0.8mm-M1.2mm, the surface brittleness of the precise fastener is increased, the plastic deformation condition of materials is reduced, the breakage phenomenon can occur in the use process of the middle carbon alloy steel precise fastener, the hardness of teeth is uneven due to the fact that the teeth are subjected to tooth twisting extrusion, and the tissue transformation time is not well controlled in the heat treatment carburization process.
Therefore, there is a need to develop a technique capable of avoiding breakage of the small outer diameter of the medium carbon alloy steel precision fastener at m0.8mm-m1.2 mm.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the embodiment of the application provides a micro carbonitriding process for a precise fastener of medium carbon alloy steel, which can effectively avoid the breakage phenomenon of the precise fastener by reasonably controlling the temperature, the carbon concentration and the ammonia flow and the time.
In order to achieve the above purpose, the present application provides the following technical solutions: the micro-carbonitriding process of the medium carbon alloy steel precise fastener comprises the following steps:
step 1): placing the fastener material into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to generate the fastener material to be carbonitriding;
step 2): mixing liquefied petroleum gas and air, introducing the mixture into a furnace for catalytic decomposition to generate mixed gas after mixing and decomposing the liquefied petroleum gas and the air;
step 3): introducing the mixed gas generated in the step 2) after mixing and decomposing the liquefied petroleum gas and air into a quenching furnace with a preset temperature to be in contact with the fastener material to be carbonitriding in the step 1), and introducing ammonia gas in the process to obtain the quenched carbonitriding fastener material subjected to carbonitriding treatment;
step 4): placing the quenched carbonitriding fastener material obtained in the step 3) into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to obtain a carbonitriding fastener finished product;
wherein the carbon concentration in the carbonitriding treatment in the step 3) is 0.45-0.5%, and ammonia gas is introduced for 0.2-0.25m 3 /h; the carbonitriding time is 23-27min.
Further, the predetermined temperature in the quenching furnace in the step 3) is set to be 880-890 ℃.
Further, in the step 1), the fastener material is placed into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing, so as to generate the fastener material to be carbonitriding, which specifically comprises the following steps:
placing the fastener material into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to generate a degreased fastener material;
placing the degreased fastener material into cleaning equipment, adding water to clean and remove surface degreasing residues, and carrying out water cleaning again at a net drawing frequency of 30 minutes/time to obtain a cleaned fastener material;
placing the cleaned fastener material into a dehydrator for dehydration to obtain a dry fastener material;
and (3) spreading the dried fastener material on a mesh belt to obtain the fastener material to be carbonitriding.
Further, in the step 2), the liquefied petroleum gas and the air are mixed and introduced into a furnace for catalytic decomposition, so as to generate mixed gas after the liquefied petroleum gas and the air are mixed and decomposed, and the temperature in the furnace is 1030 ℃.
Further, the catalyst for catalytic decomposition is a nickel catalyst;
the nickel catalyst is a two-stage conversion catalyst taking nickel as an active component and aluminum oxide as a main carrier.
Further, in the step 3), the mixed gas generated in the step 2) and after being mixed and decomposed with air is introduced into a quenching furnace with a preset temperature to be in contact with the fastener material to be carbonitriding in the step 1), and ammonia is introduced in the process to obtain the carbonitriding fastener material after quenching through carbonitriding treatment, and the method further comprises the following steps:
and carrying out oil bath cooling on the carbonitriding fastener material subjected to carbonitriding treatment to obtain the quenched carbonitriding fastener material.
Further, in the step 4), the carbonitriding fastener material obtained after quenching in the step 3) is put into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to obtain a carbonitriding fastener finished product, and the method specifically comprises the following steps:
placing the carbonitriding fastener material obtained in the step 3) into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to obtain a degreased fastener material;
placing the degreased fastener material into cleaning equipment, adding water for cleaning to remove surface degreasing residues, and carrying out water cleaning again at a net drawing frequency of 30 minutes/time to obtain a clean carbonitriding fastener material;
placing the obtained clean carbonitriding fastener material into a dehydrator, dehydrating and heating to obtain a dehydrated fastener;
and placing the dehydrated fastener in a baking tray for tempering treatment to obtain a carbonitriding fastener finished product.
Further, the dehydrated fastener is placed in a baking tray for tempering treatment to obtain a carbonitriding fastener finished product, which specifically comprises the following steps:
the tempering treatment temperature is between 415 and 420 ℃ and the time is 80 to 90 minutes.
Further, the temperature of the aqueous solution of the water-soluble degreasing agent, which is obtained by placing the quenched carbonitriding fastener material obtained in the step 3) into the aqueous solution of the water-soluble degreasing agent for ultrasonic degreasing, is set between 60 ℃ and 70 ℃.
Further, the carbonitriding time of the carbonitriding treatment in the step 3) is 25 minutes.
Compared with the prior art, the application has the beneficial effects that:
1) In the implementation process, the temperature, the carbon concentration and the flow and time of the ammonia gas are reasonably controlled, so that the precision fastener is ensured not to break on the premise of ensuring the mechanical properties (the hardness of carbonitriding steel and the damage torque force), the cost is reduced, and the time is shortened;
2) The micro carbonitriding process disclosed by the application is mainly used for carbonitriding treatment of a precise fastener with the outer diameter within the range of M0.8mm-M1.2mm, the hardness of the tooth part of the surface of the fastener is controlled to be 450-500HV, the hardness of the core part of the fastener is controlled to be 370-450HV, more traditional carburizing technology is disclosed at present, the hardness of the tooth part of the surface of the fastener is required to be more than 550HV, the hardness of the core part of the fastener is controlled to be 430-490HV, and the precision fastener with the outer diameter within the range of M0.8mm-M1.2mm is easily broken, so that the use is influenced.
Detailed Description
The application is further described below with reference to examples.
Example 1 micro carbonitriding process for medium carbon alloy steel precision fastener
The method comprises the following steps:
step 1): placing the fastener material into an aqueous solution containing a water-soluble degreasing agent at 60 ℃ for ultrasonic degreasing for 10min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 5min to remove surface degreasing residues, and carrying out screen drawing frequency for 30 min/time, and washing again to obtain a cleaned fastener material;
step 2): placing the cleaned fastener material in the step 1) into a dehydrator to dehydrate for 5min to obtain a dried fastener material;
step 3): spreading the fastener material cleaned in the step 2) on a mesh belt, wherein the spreading thickness is 0.4cm, so as to obtain the fastener material to be carbonitriding;
step 4): liquefied petroleum gas 3m 3 /h and air 20m 3 mixing/H, introducing into furnace, controlling temperature to 1030 deg.C, decomposing CO, H2, N2 mixed gas with catalyst, mixing liquefied petroleum gas with air, and controlling flow of CO, H2, N2 mixed gas to 16m 3 Introducing into a quenching furnace with the temperature of 880 ℃ and contacting the fastener material to be carbonitriding obtained in the step 3), and introducing ammonia gas for 0.25m in the process 3 And (h) cooling the fastener material treated by the carbonitriding time of 23min through an oil bath at 90 ℃ to obtain the quenched carbonitriding fastener material;
step 5): placing the quenched fastener material obtained in the step 4) into an aqueous solution containing a water-soluble degreasing agent at 60-70 ℃ for ultrasonic degreasing for 8-10min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 8-10min to remove surface degreasing residues, drawing the net at a frequency of 30 min/time, and washing again to obtain a clean carbonitriding fastener material;
step 6): placing the clean carbonitriding fastener material obtained in the step 5) into a dehydrator, dehydrating for 5min, and heating to 80 ℃ to obtain a dehydrated fastener;
step 7): and (3) placing the dehydrated fastener in a baking tray for tempering treatment, wherein the tempering treatment temperature is 415 ℃, and the tempering treatment time is 80 minutes, so as to obtain a carbonitriding fastener finished product.
The catalyst in the step 4) is nickel catalyst; the nickel catalyst is a two-stage conversion catalyst taking nickel as an active component and aluminum oxide as a main carrier.
Example 2 micro carbonitriding process for medium carbon alloy steel precision fastener
The method comprises the following steps:
step 1): placing the fastener material into a 70 ℃ water solution containing a water-soluble degreasing agent for ultrasonic degreasing for 8min, then placing the degreased fastener material into cleaning equipment, adding water for cleaning for 3min to remove surface degreasing residues, and carrying out screen drawing frequency for 30 min/time, and washing again to obtain a cleaned fastener material;
step 2): placing the cleaned fastener material in the step 1) into a dehydrator to dehydrate for 5min to obtain a dried fastener material;
step 3): spreading the fastener material cleaned in the step 2) on a mesh belt, wherein the spreading thickness is 0.8cm, so as to obtain the fastener material to be carbonitriding;
step 4): liquefied petroleum gas 3.5m 3 /h and air 25m 3 mixing/H, introducing into furnace, controlling temperature to 1030 deg.C, decomposing CO, H2, N2 mixed gas with catalyst, mixing liquefied petroleum gas with air, and controlling flow of CO, H2, N2 mixed gas to 16m 3 Introducing into a quenching furnace with the temperature of 890 ℃ and contacting the fastener material to be carbonitriding obtained in the step 3), and introducing ammonia gas for 0.25m in the process 3 And (h) cooling the fastener material treated by the carbonitriding time of 27min through an oil bath at 100 ℃ to obtain the quenched carbonitriding fastener material;
step 5): placing the quenched fastener material obtained in the step 4) into an aqueous solution containing a water-soluble degreasing agent at 70 ℃ for ultrasonic degreasing for 8min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 8min to remove surface degreasing residues, drawing the net for 30 min/time, and washing again to obtain a clean carbonitriding fastener material;
step 6): placing the clean carbonitriding fastener material obtained in the step 5) into a dehydrator, dehydrating for 5min, and heating to 80 ℃ to obtain a dehydrated fastener;
step 7): and (3) placing the dehydrated fastener in a baking tray for tempering treatment, wherein the tempering treatment temperature is 420 ℃, and the tempering treatment time is 90 minutes, so as to obtain a carbonitriding fastener finished product.
The catalyst in the step 4) is nickel catalyst; the nickel catalyst is a two-stage conversion catalyst taking nickel as an active component and aluminum oxide as a main carrier.
Example 3 micro carbonitriding process for medium carbon alloy steel precision fastener
The method comprises the following steps:
step 1): placing the fastener material into an aqueous solution containing a water-soluble degreasing agent at 65 ℃ for ultrasonic degreasing for 9min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 4min to remove surface degreasing residues, and carrying out screen drawing frequency for 30 min/time, and washing again to obtain a cleaned fastener material;
step 2): placing the cleaned fastener material in the step 1) into a dehydrator to dehydrate for 5min to obtain a dried fastener material;
step 3): spreading the fastener material cleaned in the step 2) on a mesh belt, wherein the spreading thickness is 0.6cm, so as to obtain the fastener material to be carbonitriding;
step 4): liquefied petroleum gas 3.5m 3 /h and air 25m 3 mixing/H, introducing into furnace, controlling temperature to 1030 deg.C, decomposing CO, H2, N2 mixed gas with catalyst, mixing liquefied petroleum gas with air, and controlling flow of CO, H2, N2 mixed gas to 16m 3 Introducing into a quenching furnace with the temperature of 885 ℃ and contacting the fastener material to be carbonitriding obtained in the step 3), and introducing ammonia gas for 0.25m in the process 3 And (h) cooling the fastener material treated by the carbonitriding time of 25min through an oil bath at 95 ℃ to obtain the quenched carbonitriding fastener material;
step 5): placing the quenched fastener material obtained in the step 4) into an aqueous solution containing a water-soluble degreasing agent at 65 ℃ for ultrasonic degreasing for 9min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 9min to remove surface degreasing residues, drawing the net for 30 min/times, and washing again to obtain a clean carbonitriding fastener material;
step 6): placing the clean carbonitriding fastener material obtained in the step 5) into a dehydrator, dehydrating for 5min and heating to 75 ℃ to obtain a dehydrated fastener;
step 7): and (3) placing the dehydrated fastener in a baking tray for tempering treatment, wherein the tempering treatment temperature is 418 ℃ and the tempering treatment time is 85min, so as to obtain a carbonitriding fastener finished product.
The catalyst in the step 4) is nickel catalyst; the nickel catalyst is a two-stage conversion catalyst taking nickel as an active component and aluminum oxide as a main carrier.
Comparative example
Fastener end products were prepared using methods conventional in the art and then tested for performance.
The specific operation method comprises the following steps:
step 1): placing the fastener material into an aqueous solution containing a water-soluble degreasing agent at 65 ℃ for ultrasonic degreasing for 9min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 4min to remove surface degreasing residues, and carrying out screen drawing frequency for 30 min/time, and washing again to obtain a cleaned fastener material;
step 2): placing the cleaned fastener material in the step 1) into a dehydrator to dehydrate for 5min to obtain a dried fastener material;
step 3): spreading the fastener material cleaned in the step 2) on a mesh belt, wherein the spreading thickness is 0.6cm, so as to obtain the fastener material to be carburized;
step 4): liquefied petroleum gas 3.5m 3 Introducing into furnace to control temperature to 1030 deg.C, decomposing with catalyst, and controlling gas flow rate of liquefied petroleum gas to 16m 3 Introducing into a quenching furnace with the temperature of 900 ℃ and contacting the fastener material to be carbonitriding obtained in the step 3), wherein the carbon concentration is 1.0%, the contact time is 25min, and cooling the treated fastener material by an oil bath at the temperature of 95 ℃ to obtain the carburized fastener material after quenching;
step 5): placing the quenched fastener material obtained in the step 4) into an aqueous solution containing a water-soluble degreasing agent at 65 ℃ for ultrasonic degreasing for 9min, placing the degreased fastener material into cleaning equipment, adding water for cleaning for 9min to remove surface degreasing residues, drawing the net at a frequency of 30 min/time, and washing again to obtain a clean carburized fastener material;
step 6): placing the clean carburized fastener material obtained in the step 5) into a dehydrator, dehydrating for 5min and heating to 75 ℃ to obtain a dehydrated fastener;
step 7): and (3) placing the dehydrated fastener in a baking tray for tempering treatment, wherein the tempering treatment temperature is 418 ℃ and the time is 85min, so as to obtain a carburized fastener finished product.
The catalyst in the step 4) is nickel catalyst; the nickel catalyst is a two-stage conversion catalyst taking nickel as an active component and aluminum oxide as a main carrier.
Effect experiment
200 finished precision fasteners were prepared according to the methods disclosed in examples 1-3 and comparative examples, respectively, and then 50 pieces were randomly selected for hardness and breaking torque testing, respectively, and the average was taken, and the test results were shown in tables 1 and 2 below.
1. Hardness test
The detection method comprises the following steps: the detection was carried out according to the method disclosed in standard ISO898-1:2009, the detection results being shown in Table 1 below.
TABLE 1 hardness test results of the fasteners prepared in 1-3 and comparative examples
| Examples | Hardness of surface tooth | Core hardness |
| Example 1 | 479HV | 410HV |
| Example 2 | 480HV | 421HV |
| Example 3 | 483HV | 426HV |
| Comparative example 1 | 550HV | 460HV |
According to the detection data of the table 1, the micro carbonitriding process disclosed by the application is used for preparing a carbonitriding fastener finished product, so that the hardness of the surface teeth of the precise fastener with the outer diameter within the range of M0.8mm-M1.2mm can be controlled between 479-484HV, the core hardness is controlled between 407-429HV, the use requirement can be met, the condition that the precise fastener breaks can not be caused, the hardness of the surface teeth of the precise fastener obtained by changing parameters in the process in the comparative example in the range of not requiring protection of the application is 550HV, the core hardness is 460HV, the traditional process easily causes the carburized layer with the smaller outer diameter of the precise fastener within the range of M0.8mm-M1.2mm to be too deep, the surface brittleness of the precise fastener is increased to reduce the plastic deformation condition of materials, the breakage phenomenon can occur in the use process of the precise fastener of medium carbon alloy steel, and the industry requirement can not be met.
2. Breaking torsion test
The detection method comprises the following steps: the detection was carried out according to the method disclosed in standard ISO898-1:1992, the detection results being shown in Table 2 below.
TABLE 2 results of breaking torque for fasteners prepared in 1-3 and comparative examples
| Examples | Breaking torsion |
| Example 1 | 1.22kgf.cm |
| Example 2 | 1.24kgf.cm |
| Example 3 | 1.28kgf.cm |
| Comparative example | 1.08kgf.cm |
According to the detection data of the table 2, the micro carbonitriding process provided by the application is used for preparing a carbonitriding fastener finished product, the damage torque of a precision fastener with the outer diameter within the range of M0.8mm-M1.2mm can be improved to 1.22kgf.cm, the fracture phenomenon can not occur, the use requirement is completely met, the damage torque of the precision fastener obtained by changing the parameters in the process in the comparative example without the scope of the application claimed by the application can only reach 1.08kgf.cm, and the damage torque is obviously lower than that of the precision fastener provided by the application, and the obtained product can not meet the industry requirement.
However, the foregoing is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the application, i.e., the application is defined by the appended claims and their description with the full scope of equivalents to which they are entitled. Furthermore, the abstract sections and headings are provided solely for the purpose of aiding in the search of the patent document and are not intended to limit the scope of the claims.
Claims (10)
1. The micro-carbonitriding process for the medium carbon alloy steel precise fastener is characterized by comprising the following steps of:
step 1): placing the fastener material into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to generate the fastener material to be carbonitriding;
step 2): mixing liquefied petroleum gas and air, introducing the mixture into a furnace for catalytic decomposition to generate mixed gas after mixing and decomposing the liquefied petroleum gas and the air;
step 3): introducing the mixed gas generated in the step 2) after mixing and decomposing the liquefied petroleum gas and air into a quenching furnace with a preset temperature to be in contact with the fastener material to be carbonitriding in the step 1), and introducing ammonia gas in the process to obtain the quenched carbonitriding fastener material subjected to carbonitriding treatment;
step 4): placing the quenched carbonitriding fastener material obtained in the step 3) into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to obtain a carbonitriding fastener finished product;
wherein the carbon concentration in the carbonitriding treatment in the step 3) is 0.45-0.5%, and ammonia gas is introduced for 0.2-0.25m 3 /h; the carbonitriding time is 23-27min.
2. The micro carbonitriding process of a medium carbon alloy steel precision fastener according to claim 1, wherein the predetermined temperature in the quenching furnace in the step 3) is set to be 880-890 ℃.
3. The micro-carbonitriding process of the medium carbon alloy steel precise fastener according to claim 1, wherein in the step 1), the fastener material is placed into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing, and the fastener material to be carbonitriding is produced, specifically comprising:
placing the fastener material into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to generate a degreased fastener material;
placing the degreased fastener material into cleaning equipment, adding water to clean and remove surface degreasing residues, and carrying out water cleaning again at a net drawing frequency of 30 minutes/time to obtain a cleaned fastener material;
placing the cleaned fastener material into a dehydrator for dehydration to obtain a dry fastener material;
and (3) spreading the dried fastener material on a mesh belt to obtain the fastener material to be carbonitriding.
4. The micro-carbonitriding process of the medium carbon alloy steel precise fastener according to claim 1, wherein in the step 2), liquefied petroleum gas and air are mixed and introduced into a furnace for catalytic decomposition, mixed gas of the liquefied petroleum gas and the air after mixing and decomposition is generated, and the temperature in the furnace is 1030 ℃.
5. The micro carbonitriding process of a medium carbon alloy steel precision fastener according to claim 4, wherein the catalyst for catalytic decomposition is a nickel catalyst;
the nickel catalyst is a two-stage conversion catalyst taking nickel as an active component and aluminum oxide as a main carrier.
6. The micro carbonitriding process of the medium carbon alloy steel precise fastener according to claim 1, wherein in the step 3), the mixed gas generated by mixing and decomposing the liquefied petroleum gas and the air in the step 2) is introduced into a quenching furnace with a preset temperature to be contacted with the fastener material to be carbonitriding in the step 1), and ammonia is introduced in the process to obtain the carbonitriding fastener material after quenching by carbonitriding treatment, and the micro carbonitriding process further comprises:
and carrying out oil bath cooling on the carbonitriding fastener material subjected to carbonitriding treatment to obtain the quenched carbonitriding fastener material.
7. The micro-carbonitriding process of the medium carbon alloy steel precise fastener according to claim 1, wherein in the step 4), the carbonitriding fastener material obtained after quenching in the step 3) is put into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing, so as to obtain a carbonitriding fastener finished product, and the micro-carbonitriding process specifically comprises the following steps:
placing the carbonitriding fastener material obtained in the step 3) into an aqueous solution containing a water-soluble degreasing agent for ultrasonic degreasing to obtain a degreased fastener material;
placing the degreased fastener material into cleaning equipment, adding water for cleaning to remove surface degreasing residues, and carrying out water cleaning again at a net drawing frequency of 30 minutes/time to obtain a clean carbonitriding fastener material;
placing the obtained clean carbonitriding fastener material into a dehydrator, dehydrating and heating to obtain a dehydrated fastener;
and placing the dehydrated fastener in a baking tray for tempering treatment to obtain a carbonitriding fastener finished product.
8. The micro-carbonitriding process of the medium carbon alloy steel precise fastener according to claim 7, wherein the step of placing the dehydrated fastener in a baking tray for tempering treatment to obtain a carbonitriding fastener finished product specifically comprises the following steps:
the tempering treatment temperature is between 415 and 420 ℃ and the time is 80 to 90 minutes.
9. The micro carbonitriding process of a medium carbon alloy steel precision fastener according to claim 7, wherein the temperature of the aqueous solution of the water-soluble degreasing agent for ultrasonic degreasing is set between 60 ℃ and 70 ℃ by placing the quenched carbonitriding fastener material obtained in step 3) into the aqueous solution of the water-soluble degreasing agent.
10. The micro-carbonitriding process for medium carbon alloy steel precision fasteners according to claim 1, characterized in that the carbonitriding time of the carbonitriding treatment in the step 3) is 25min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733770.1A CN115044861B (en) | 2022-06-27 | 2022-06-27 | Micro-carbonitriding process for medium carbon alloy steel precise fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733770.1A CN115044861B (en) | 2022-06-27 | 2022-06-27 | Micro-carbonitriding process for medium carbon alloy steel precise fastener |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115044861A CN115044861A (en) | 2022-09-13 |
| CN115044861B true CN115044861B (en) | 2023-11-17 |
Family
ID=83163785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210733770.1A Active CN115044861B (en) | 2022-06-27 | 2022-06-27 | Micro-carbonitriding process for medium carbon alloy steel precise fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115044861B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100188A (en) * | 1985-04-01 | 1988-08-10 | 陕西机械学院 | Wet body carburization process in little nitrogen |
| CN102534465A (en) * | 2012-02-02 | 2012-07-04 | 山东常林机械集团股份有限公司 | Heat treatment process for surface hardening and carbonitriding of hydraulic parts |
| CN105925932A (en) * | 2016-05-26 | 2016-09-07 | 滨中元川金属制品（昆山）有限公司 | Micro-carbonitriding process for 1215-free-cutting-steel fastener |
| CN108342680A (en) * | 2018-04-13 | 2018-07-31 | 厦门真冈热处理有限公司 | The carbo-nitriding method of thin wall steel pieces |
| CN112522661A (en) * | 2020-07-27 | 2021-03-19 | 滨中元川金属制品（昆山）有限公司 | Micro carburizing process for thin precision fastener |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5241455B2 (en) * | 2008-12-02 | 2013-07-17 | 新日鐵住金株式会社 | Carbonitriding member and method for producing carbonitriding member |
| JP5639064B2 (en) * | 2009-09-11 | 2014-12-10 | 新日鐵住金株式会社 | Method for producing carbonitrided member |
-
2022
- 2022-06-27 CN CN202210733770.1A patent/CN115044861B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85100188A (en) * | 1985-04-01 | 1988-08-10 | 陕西机械学院 | Wet body carburization process in little nitrogen |
| CN102534465A (en) * | 2012-02-02 | 2012-07-04 | 山东常林机械集团股份有限公司 | Heat treatment process for surface hardening and carbonitriding of hydraulic parts |
| CN105925932A (en) * | 2016-05-26 | 2016-09-07 | 滨中元川金属制品（昆山）有限公司 | Micro-carbonitriding process for 1215-free-cutting-steel fastener |
| CN108342680A (en) * | 2018-04-13 | 2018-07-31 | 厦门真冈热处理有限公司 | The carbo-nitriding method of thin wall steel pieces |
| CN112522661A (en) * | 2020-07-27 | 2021-03-19 | 滨中元川金属制品（昆山）有限公司 | Micro carburizing process for thin precision fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115044861A (en) | 2022-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6378189B2 (en) | Method of nitriding steel member | |
| CN112522661B (en) | Micro carburizing process for thin precision fastener | |
| CN102517541A (en) | Gas nitriding treatment method of 11Cr17 stainless steel slip sheet | |
| CN115044861B (en) | Micro-carbonitriding process for medium carbon alloy steel precise fastener | |
| CN105586565A (en) | Carbonitriding thermal treatment process for strengthening wear resistance of bearing ring | |
| CN110560506A (en) | production process for preventing surface decarburization of seamless steel tube for high-pressure boiler | |
| US7108756B2 (en) | Method for heat-treating work pieces made of temperature-resistant steels | |
| CN111763907A (en) | Salt bath nitriding agent for metal workpiece surface treatment and metal workpiece surface treatment method | |
| JP2004332074A (en) | Carburizing method | |
| CN115418602B (en) | Carbonitriding method for austenitic stainless steel | |
| CN111378822A (en) | Medium carbon steel quenching treatment process for reducing quenching cracking | |
| CN110760784B (en) | Method for improving nitrocarburizing stability of nut | |
| JP6374178B2 (en) | Manufacturing method of machine parts | |
| CN114921637A (en) | Bearing part heat treatment method | |
| CN108203802A (en) | A kind of metal heating processing technology | |
| KR101696103B1 (en) | Method for heat-treatment and removing scale of austenitic stainless steel | |
| CN106893828A (en) | A kind of rapid quenching medium and preparation technology | |
| CN112981419A (en) | Heat treatment process of cold-extruded cross shaft | |
| CN111424151A (en) | Quenching method for chain assembly production | |
| CN114672621B (en) | Heat treatment process for improving 1Cr11MoV calendering roller reticular structure | |
| JP5503231B2 (en) | Continuous processing apparatus and continuous processing method for aluminum alloy plate | |
| CN117305757A (en) | Rapid gas soft nitriding method capable of obtaining high wear-resistant layer | |
| CN116145073A (en) | Novel nitriding process for stainless steel | |
| CN115896683A (en) | QPQ production process based on repair and reinforcement treatment technology | |
| CN115976459A (en) | Carbonitriding clamping piece heat treatment process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |