CN113846284B - Ion nitriding process for 25Cr2Ni3Mo material - Google Patents
Ion nitriding process for 25Cr2Ni3Mo material Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- 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
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- 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
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
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Abstract
The invention provides an ion nitriding process of a 25Cr2Ni3Mo material, which is an ion nitriding process for a workpiece of the 25Cr2Ni3Mo material, and mainly comprises the steps of normalizing treatment, quenching treatment and then ion nitriding treatment. The ion nitriding process for the 25Cr2Ni3Mo material provided by the invention is simple in process, economical and efficient, and can also improve the performances of strength, corrosion resistance, wear resistance, surface seizure resistance, fatigue resistance and the like of the 25Cr2Ni3Mo material.
Description
Technical Field
The invention belongs to the technical field of material heat treatment, and particularly relates to an ion nitriding process of a 25Cr2Ni3Mo material.
Background
The ion nitriding process is a material chemical treatment method for improving the hardness, the wear resistance, the seizure resistance and the corrosion resistance of the metal surface, so that the material has the properties, and meanwhile, the toughness of the core part is kept, so that the material has higher mechanical properties.
At present, no ion nitriding process report of 25Cr2Ni3Mo material exists in the prior art, and ion nitriding treatment is carried out on parts which are required to be high in strength, corrosion-resistant and surface wear-resistant, so that the wear resistance of the workpiece can be remarkably improved, the requirements of high strength, corrosion resistance and wear resistance can be met, and meanwhile, the bearing capacity and the fatigue life of the workpiece can be remarkably improved due to high core strength and high hardness. Therefore, it is necessary to design a simple and effective ion nitriding process to be applied to the 25Cr2Ni3Mo material, so that the workpiece of the 25Cr2Ni3Mo material can not only simultaneously satisfy high strength, corrosion resistance and high wear resistance, but also simultaneously greatly improve the seizure resistance and fatigue life of the surface of the material.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ion nitriding process for 25Cr2Ni3Mo material, which is simple in process, economical and efficient, so as to improve the performances of strength, corrosion resistance, wear resistance, surface seizure resistance, fatigue resistance and the like of the 25Cr2Ni3Mo material.
In order to solve the technical problems, the invention provides an ion nitriding process of a 25Cr2Ni3Mo material, which comprises the following steps:
normalizing: normalizing at 860-880 deg.c, heating at 70-100 deg.c/hr for heat preservation for 33-40mm, and air cooling;
quenching: quenching at 840-850 deg.c, heating at 70-100 deg.c/hr for heat preservation for 33-40mm, and oil cooling;
ion nitriding: the temperature of the ion nitriding is 490-540 ℃, the temperature of the ion nitriding is kept for 20-32 hours, the temperature of the furnace is reduced to 200 ℃, and then the furnace is taken out for air cooling.
Further, the 25Cr2Ni3Mo material is a forging, the normalizing treatment is required, and the 25Cr2Ni3Mo material is a plate or bar without the normalizing treatment.
Further, the ion nitriding treatment of the 25Cr2Ni3Mo material comprises the following steps:
after the materials are charged into a furnace and vacuumized to below 15Pa, introducing ammonia gas into the furnace;
stopping vacuumizing to 300 ℃ and introducing air to normal pressure, vacuumizing to below 15Pa, heating to 300 ℃ and introducing air to normal pressure, and circulating for 3-5 times;
heating to 500 ℃, and preserving heat for 20-32 hours;
cooling to 200 deg.c, and air cooling.
Further, the flow of ammonia gas in the furnace is controlled to be 1.1-1.6L/min, the voltage is controlled to be 650-880V, the current is controlled to be 12-20A, and the working air pressure is controlled to be 120-1000Pa during heat preservation.
Further, the working air pressure is controlled to be 400-600Pa.
Further, the equipment used in the ion nitriding treatment is a glow ion nitriding furnace.
Furthermore, the 25Cr2Ni3Mo material is subjected to surface cleaning before ion nitriding treatment, so that the surface cleanliness of the material is ensured.
Further, the chemical composition of the 25Cr2Ni3Mo material meets the specification of GB/T3077-2015 standard.
Further, the ion nitriding temperature is adjusted in the range of 490-540 ℃ according to the requirements on the strength and hardness of the workpiece core of the 25Cr2Ni3Mo material.
Further, according to the requirement on the thickness of the nitriding layer of the workpiece made of the 25Cr2Ni3Mo material, the heat preservation time of the ion nitriding is selected in the range of 20-32 hours.
According to the ion nitriding process of the 25Cr2Ni3Mo material, a workpiece made of the 25Cr2Ni3Mo material is used as a cathode, a furnace body is used as an anode in the ion nitriding process, and ammonia gas is introduced after the furnace is vacuumized, so that the furnace pressure is kept at 400-600Pa. Then, a high-voltage direct current electric field is added, and the lean ammonia-containing gas is ionized in the high-voltage direct current electric field for nitriding. According to the sputtering deposition theory, the sputtering effect is mainly taken as the main, and the nitrogen-hydrogen molecular ion effect and the neutral nitrogen atom effect are also involved. Meanwhile, in the process of ion nitriding the 25Cr2Ni3Mo material, in the process of heating to 500 ℃, the temperature is raised to 300 ℃, vacuumizing is stopped, air is introduced to normal pressure, vacuumizing is carried out to below 15Pa, air is introduced to normal pressure when the temperature is raised to 300 ℃, and the process is circulated for 3-5 times, so that a passivation film on the surface of a workpiece can be removed, and the uniformity of the deep layer of the workpiece can be improved.
The provided ion nitriding process for the 25Cr2Ni3Mo material has the following advantages:
1. the ionic nitriding process is applied to the 25Cr2Ni3Mo material, and the bearing capacity and the fatigue life are also greatly improved on the premise of meeting the requirements of high strength, corrosion resistance and wear resistance of the material. The process is applied to the actual production of the gear parts made of 25Cr2Ni3Mo material in batches, and the effect is expected.
2. The ion nitriding process provided by the invention can be used for ion nitriding of all high-strength, corrosion-resistant and wear-resistant 25Cr2Ni3Mo material parts, and is also suitable for ion nitriding of other workpieces made of 25Cr2Ni3Mo materials.
3. The ion nitriding process provided by the invention has the characteristics of simple process, economy and high efficiency, and is worthy of popularization and application.
Drawings
FIG. 1 is a flowchart of an ion nitriding process of a 25Cr2Ni3Mo material provided by an embodiment of the invention;
FIG. 2 is an ion nitriding oozed layer depth metallographic photograph of a sample prepared by an ion nitriding process of the 25Cr2Ni3Mo material provided by comparative example 1;
FIG. 3 is an ion nitriding oozed layer depth metallographic photograph of a sample prepared by the ion nitriding process of the 25Cr2Ni3Mo material provided in the embodiment 1 of the present invention;
FIG. 4 is an ion nitriding oozed layer depth metallographic photograph of a sample prepared by an ion nitriding process of the 25Cr2Ni3Mo material provided by comparative example 2;
FIG. 5 is an ion nitriding oozed layer depth metallographic photograph of a sample prepared by the ion nitriding process of the 25Cr2Ni3Mo material provided in the embodiment 2 of the present invention;
FIG. 6 is an ion nitriding oozed layer depth metallographic photograph of a sample prepared by an ion nitriding process of the 25Cr2Ni3Mo material provided by comparative example 3 of the present invention;
fig. 7 is an ion nitriding oozed layer depth metallographic photograph of a sample prepared by the ion nitriding process of the 25Cr2Ni3Mo material provided in example 3 of the present invention.
Detailed Description
Referring to fig. 1, the ion nitriding process of the 25Cr2Ni3Mo material provided by the embodiment of the invention is to perform normalizing treatment and quenching treatment first, and then to perform ion nitriding treatment. The process is aimed at a workpiece made of 25Cr2Ni3Mo material, and specifically comprises the following steps:
(1) Normalizing: this normalizing is required if the workpiece of 25Cr2Ni3Mo material is a forging, and is not required if the workpiece of 25Cr2Ni3Mo material is a plate or bar. Wherein the normalizing treatment temperature is 860-880 ℃, the heating speed is 70-100 ℃/h, the heat preservation time is (effective thickness/33-40 mm) hours, and then air cooling is carried out.
(2) Quenching: the quenching treatment is carried out at 840-850 ℃, the heating speed is 70-100 ℃/h, the heat preservation time is (effective thickness/33-40 mm) for hours, and then the oil cooling is carried out.
(3) Ion nitriding: the temperature of the ion nitriding process is 490-540 ℃, the nitriding heat preservation time is 20-32 hours, the furnace cooling is reduced to 200 ℃, and then the furnace is taken out for air cooling. Wherein, the ion nitriding treatment equipment adopts a glow ion nitriding furnace, and the specific process of the ion nitriding treatment is as follows:
firstly, the surface of a workpiece is cleaned, so that the cleanliness of the surface of the workpiece is ensured. Vacuumizing to below 15Pa after furnace loading, then introducing dry ammonia gas, starting to raise the temperature, stopping vacuumizing when the temperature reaches 300 ℃, introducing air, vacuumizing to below 15Pa, raising the temperature to 300 ℃, introducing air, and circulating for 3-5 times (namely, according to the process of vacuumizing-raising the temperature to 300 ℃ and introducing air to normal pressure); heating to 500 deg.c for heat preservation, controlling ammonia flow rate in heat preservation stage at 1.1-1.6L/min, controlling voltage at 650-880V, current at 12-20A, operating air pressure at 120-1000Pa (preferably 400-600 Pa), maintaining for 20-32 hr, cooling to 200 deg.c, and cooling in furnace.
Wherein the chemical composition of the 25Cr2Ni3Mo material meets the specification of GB/T3077-2015 standard.
Wherein, according to the requirements of the strength and the hardness of the workpiece center, the ion nitriding temperature is adjusted within the range of 490-540 ℃.
Wherein, according to the requirement on the thickness of the nitriding layer of the workpiece, the ion nitriding heat preservation time is selected within the range of 20-32 hours.
The ion nitriding process of the 25Cr2Ni3Mo material provided by the invention is specifically described below by examples and comparative examples respectively. Wherein, the original state of the workpiece made of 25Cr2Ni3Mo material is a forging.
Comparative example 1
The chemical components of the 25Cr2Ni3Mo material used in the comparative example are as follows: 0.22% of C; si:0.20%; mn:0.32%; cr:1.4%; ni:3.3%; mo:0.33%; s:0.006%; p:0.01%. The method comprises the following steps of:
(1) Normalizing, heating at a heating rate of 100 ℃/h, preserving heat for 3 hours at 860 ℃, and then air-cooling;
(2) Quenching, heating at a heating rate of 70 ℃/h, preserving heat for 3 hours at 850 ℃, and then cooling with oil;
(3) Tempering, preserving heat for 5 hours at 530 ℃, and then air cooling;
(4) Ion nitriding: ion nitriding at 490 ℃ for heat preservation for 32 hours, cooling to 200 ℃ in a furnace, and then discharging and air cooling. The ion nitriding infiltrate layer depth metallographic photograph of the sample prepared in this comparative example is shown in fig. 2.
Example 1
The difference from comparative example 1 is that: in the embodiment 1 of the invention, the tempering treatment of the step (3) in the comparative example 1 is omitted, and meanwhile, the tempering treatment of the step (3) and the ion nitriding treatment of the step (4) are combined. Namely:
(1) Normalizing, heating at a heating rate of 100 ℃/h, preserving heat for 3 hours at 860 ℃, and then air-cooling;
(2) Quenching, heating at a heating rate of 70 ℃/h, preserving heat for 3 hours at 850 ℃, and then cooling with oil;
(3) Ion nitriding: ion nitriding at 490 ℃ for heat preservation for 32 hours, cooling to 200 ℃ in a furnace, and then discharging and air cooling. The ion nitriding infiltrate layer depth metallographic photograph of the sample prepared in this example is shown in fig. 3. The specific process of the ion nitriding treatment is as follows: firstly cleaning a workpiece, vacuumizing to below 15Pa after furnace loading, then introducing dried ammonia gas, starting to heat up, stopping vacuumizing when the temperature reaches 300 ℃, introducing air, vacuumizing to below 15Pa, heating to 300 ℃, introducing air, and circulating for 4 times (according to the process of vacuumizing-heating to 300 ℃ to normal pressure); the temperature is raised to 490 ℃ for heat preservation, the ammonia flow rate in the heat preservation stage is controlled to be 1.1L/min, the voltage is controlled to be 720V, the current is controlled to be 12A, the working air pressure is about 4000Pa, the heat preservation time is 32 hours, and the temperature is reduced to 200 ℃ for discharging and air cooling.
According to the index of the permeation layer of the 25Cr2Ni3Mo material after ion nitriding in the test example 1, the depth of the nitriding layer is basically the same as that of the comparative example 1, and the hardness of the surface and the core is slightly higher than that of the comparative example 1, that is to say, after the tempering treatment process is omitted in the test example, the performance of the nitriding layer is basically not affected, the tempering treatment process can be completely omitted, and the ion nitriding can be directly used for replacing the material. The 25Cr2Ni3Mo material can obtain better effect after nitriding at 490 ℃. The index of the ion nitriding percolation layer and the index of the mechanical property are shown in tables 1 and 2 respectively.
TABLE 1
| Numbering device | Depth of nitrided layer (mm) | Surface Hardness (HV) | Hardness of core (HB) |
| Comparative example 1 | 0.50 | 965 | 367 |
| Example 1 | 0.52 | 985 | 371 |
TABLE 2
Comparative example 2
The chemical components of the 25Cr2Ni3Mo material used in the comparative example are as follows: 0.25% of C; si:0.18%; mn:0.29%; cr:1.6%; ni:3.0%; mo:0.31%; s:0.005%; p:0.02%. The method comprises the following steps of:
(1) Normalizing, heating at a heating rate of 85 ℃/h, preserving heat for 3.5 hours at 870 ℃, and then air-cooling;
(2) Quenching, heating at a heating rate of 85 ℃/h, preserving heat for 3.5 hours at 845 ℃, and then cooling with oil;
(3) Tempering, preserving heat for 5 hours at 530 ℃, and then air cooling;
(4) Ion nitriding: ion nitriding at 540 deg.c for 20 hr, cooling to 200 deg.c, and cooling. The ion nitriding infiltrate depth metallographic photograph of the sample prepared in this comparative example is shown in fig. 4.
Example 2
The difference from comparative example 2 is that: in the embodiment 2 of the invention, the tempering treatment of the step (3) in the comparative example 2 is omitted, and meanwhile, the tempering treatment of the step (3) and the ion nitriding treatment of the step (4) are combined. Namely:
(1) Normalizing, heating at a heating rate of 85 ℃/h, preserving heat for 3.5 hours at 860 ℃, and then air-cooling;
(2) Quenching, heating at a heating rate of 85 ℃/h, preserving heat for 3.5 hours at 845 ℃, and then cooling with oil;
(3) Ion nitriding: ion nitriding at 540 deg.c for 20 hr, cooling to 200 deg.c, and cooling. The ion nitriding infiltrate layer depth metallographic photograph of the sample prepared in this example is shown in fig. 5. The specific process of the ion nitriding treatment is as follows: firstly cleaning a workpiece, vacuumizing to below 15Pa after furnace loading, then introducing dried ammonia gas, starting to heat up, stopping vacuumizing when the temperature reaches 300 ℃, introducing air, vacuumizing to below 15Pa, heating to 300 ℃, introducing air, and circulating for 4 times (according to the process of vacuumizing-heating to 300 ℃ to normal pressure); the temperature is increased to 540 ℃ for heat preservation, the ammonia flow rate in the heat preservation stage is controlled to be 1.6L/min, the voltage is controlled to be 720V, the current is controlled to be 20A, the working air pressure is about 600Pa, the heat preservation time is 20 hours, and the temperature is reduced to 200 ℃ for discharging and air cooling.
The index of the permeation layer after ion nitriding of the 25Cr2Ni3Mo material in the test example 2 shows that the depth of the nitriding layer is basically the same as that of the comparative example 2, and the hardness of the surface and the core is slightly higher than that of the comparative example 2, that is, the tempering treatment procedure is omitted in the embodiment, the performance of the nitriding layer is basically not influenced, the tempering treatment procedure can be completely omitted, and the ion nitriding can be directly used for replacing the nitriding layer. The 25Cr2Ni3Mo material can obtain better effect after nitriding at 540 ℃. The index of the ion nitriding percolation layer and the index of the mechanical property are shown in tables 3 and 4 respectively.
TABLE 3 Table 3
| Numbering device | Depth of nitrided layer (mm) | Surface Hardness (HV) | Hardness of core (HB) |
| Comparative example 1 | 0.51 | 970 | 363 |
| Example 1 | 0.52 | 980 | 371 |
TABLE 4 Table 4
Comparative example 3
The chemical components of the 25Cr2Ni3Mo material used in the comparative example are as follows: 0.23% of C; si:0.21%; mn:0.33%; cr:1.5%; ni:3.4%; mo:0.32%; s:0.006%; p:0.01%. The method comprises the following steps of:
(1) Normalizing, heating at a heating rate of 70 ℃/h, preserving heat for 2.5 hours at 880 ℃, and then air-cooling;
(2) Quenching, heating at a heating rate of 100 ℃/h, preserving heat for 4 hours at 840 ℃, and then cooling with oil;
(3) Tempering, preserving heat for 5 hours at 530 ℃, and then air cooling;
(4) Ion nitriding: ion nitriding at 520 deg.c for 26 hr, cooling to 200 deg.c, and cooling. The ion nitriding infiltrate layer depth metallographic photograph of the sample prepared in this comparative example is shown in fig. 6.
Example 3
The difference from comparative example 3 is that: in the embodiment 3 of the invention, the tempering treatment of the step (3) in the comparative example 3 is omitted, and meanwhile, the tempering treatment of the step (3) and the ion nitriding treatment of the step (4) are combined. Namely:
(1) Normalizing, heating at a heating rate of 70 ℃/h, preserving heat for 2 hours at 880 ℃, and then air-cooling;
(2) Quenching, heating at a heating rate of 100 ℃/h, preserving heat for 4 hours at 840 ℃, and then cooling with oil;
(3) Ion nitriding: ion nitriding at 520 deg.c for 26 hr, cooling to 200 deg.c, and cooling. The ion nitriding infiltrate layer depth metallographic photograph of the sample prepared in this example is shown in fig. 7. The specific process of the ion nitriding treatment is as follows: firstly cleaning a workpiece, vacuumizing to below 15Pa after furnace loading, then introducing dried ammonia gas, starting to heat up, stopping vacuumizing when the temperature reaches 300 ℃, introducing air, vacuumizing to below 15Pa, heating to 300 ℃, introducing air, and circulating for 4 times (according to the process of vacuumizing-heating to 300 ℃ to normal pressure); the temperature is increased to 520 ℃ for heat preservation, the ammonia flow rate in the heat preservation stage is controlled to be 1.4L/min, the voltage is controlled to be 720V, the current is controlled to be 16A, the working air pressure is about 500Pa, the heat preservation time is 26 hours, and the temperature is reduced to 200 ℃ for discharging and air cooling.
According to the index of the permeation layer of the 25Cr2Ni3Mo material after ion nitriding in the test example 3, the depth of the nitriding layer is basically the same as that of the comparative example 3, and the hardness of the surface and the core is slightly higher than that of the comparative example 3, that is to say, after the tempering treatment process is omitted in the embodiment, the performance of the nitriding layer is basically not influenced, the tempering treatment process can be completely omitted, and the ion nitriding can be directly used for replacing the material. The 25Cr2Ni3Mo material can obtain better effect after nitriding at 520 ℃. The index of the ion nitriding percolation layer and the index of the mechanical property are shown in tables 5 and 6 respectively.
TABLE 5
| Numbering device | Depth of nitrided layer (mm) | Surface Hardness (HV) | Hardness of core (HB) |
| Comparative example 1 | 0.49 | 981 | 372 |
| Example 1 | 0.51 | 988 | 375 |
TABLE 6
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (5)
1. An ion nitriding process of a 25Cr2Ni3Mo material is characterized by sequentially carrying out the following steps:
normalizing: normalizing at 860-880 deg.c, heating at 70-100 deg.c/hr for 2.5-3.5 hr, and air cooling;
quenching: quenching at 840-850 deg.c, heating at 70-100 deg.c/hr for 3-4 hr, and oil cooling;
ion nitriding: the temperature of the ion nitriding is 490-540 ℃, the temperature of the ion nitriding is kept for 20-32 hours, the temperature of the furnace is reduced to 200 ℃, and then the furnace is taken out for air cooling;
wherein, the ion nitriding treatment of the 25Cr2Ni3Mo material comprises the following steps:
after the materials are charged into a furnace and vacuumized to below 15Pa, introducing ammonia gas into the furnace;
stopping vacuumizing to 300 ℃ and introducing air to normal pressure, vacuumizing to below 15Pa, heating to 300 ℃ and introducing air to normal pressure, and circulating for 3-5 times;
heating to ion nitriding temperature and then preserving heat for 20-32 hours;
cooling to 200 ℃ and discharging for air cooling;
the flow of ammonia gas in the furnace is controlled to be 1.1-1.6L/min, the voltage is controlled to be 650-880V, the current is controlled to be 12-20A, and the working air pressure is controlled to be 120-1000Pa during the ionic nitriding heat preservation;
wherein, the equipment used in the ion nitriding treatment is a glow ion nitriding furnace.
2. The process for ion nitriding of 25Cr2Ni3Mo material according to claim 1, wherein: the 25Cr2Ni3Mo material is a forging piece, the normalizing treatment is needed, and the 25Cr2Ni3Mo material is a plate or bar without the normalizing treatment.
3. The process for ion nitriding of 25Cr2Ni3Mo material according to claim 1, wherein: the working air pressure is controlled to be 400-600Pa.
4. The process for ion nitriding of 25Cr2Ni3Mo material according to claim 1, wherein: the 25Cr2Ni3Mo material is subjected to surface cleaning before ion nitriding treatment, so that the surface cleanliness of the material is ensured.
5. The process for ion nitriding of 25Cr2Ni3Mo material according to claim 4, wherein: the chemical composition of the 25Cr2Ni3Mo material meets the specification of GB/T3077-2015 standard.
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| CN102345133A (en) * | 2011-08-10 | 2012-02-08 | 周建军 | Method for manufacturing stainless steel alloy screw stem |
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