CN115558884A - Heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness - Google Patents
Heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness Download PDFInfo
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- CN115558884A CN115558884A CN202211290908.1A CN202211290908A CN115558884A CN 115558884 A CN115558884 A CN 115558884A CN 202211290908 A CN202211290908 A CN 202211290908A CN 115558884 A CN115558884 A CN 115558884A
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- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 53
- 238000010438 heat treatment Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000010791 quenching Methods 0.000 title claims abstract description 34
- 230000000171 quenching effect Effects 0.000 title claims abstract description 34
- 238000005121 nitriding Methods 0.000 claims abstract description 39
- 239000000126 substance Substances 0.000 claims abstract description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 10
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- 238000000354 decomposition reaction Methods 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 14
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 description 8
- 238000005496 tempering Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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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
- C23C8/24—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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to a heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness, which is completed by placing quenched super martensitic stainless steel in a nitriding furnace for chemical heat treatment on the surface of gas nitriding. Compared with the prior art, after the quenching state super martensitic stainless steel is subjected to heat treatment by adopting the method, the quenching residual stress on the surface of the material is fully eliminated and is completely converted into compressive stress, a stable nitrided layer can be generated on the surface of the material, the hardness of the carburized layer can reach 1300HV, the surface hardness of the material can be greatly improved and can reach 300HV to the maximum extent, the surface hardness and the wear resistance are remarkably improved, the strength and the plasticity are kept excellent, and the service life of the material can be effectively prolonged.
Description
Technical Field
The invention belongs to the technical field of steel material heat treatment, and relates to a heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness.
Background
The super martensitic stainless steel is a novel steel type developed by greatly reducing the carbon content on the basis of the traditional martensitic stainless steel and adding alloy elements such as Ni, mo and the like, has good corrosion resistance in a complex environment, overcomes the defect of high stress crack sensitivity of the traditional martensitic stainless steel, has good hydrogen embrittlement resistance and hot processing capability, and is widely applied to industries such as aviation, ships, automobiles and the like.
Quenching is a necessary process in the heat treatment process of the super martensitic stainless steel, has important influence on the structure performance, and the conventional quenching process comprises the following steps: after the temperature is kept at 1100 +/-10 ℃ for 50-70 min, oil quenching is carried out, so that the surface of the material can generate larger residual tensile stress, and the failure risk exists in the subsequent processing process, therefore, tempering is usually arranged immediately to eliminate the residual stress during the process design. When the traditional process is used for heat treatment, the temperature required by tempering is higher (580 ℃ for 2 hours), so that the mechanical property of the material is reduced, the surface hardness is not improved, a surface oxidation layer is thickened, the processing amount of a formed part is increased, and the cost and the time are greatly increased in the actual production.
Disclosure of Invention
The invention aims to provide a heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness.
The purpose of the invention can be realized by the following technical scheme:
a heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness is to place quenched super martensitic stainless steel in a nitriding furnace for chemical heat treatment of gas nitriding surface.
Further, before entering the furnace, the surface of the sample needs to be polished by sand paper to remove an oxide layer and oil stains.
Furthermore, in the chemical heat treatment process of the gas nitriding surface, the used gas is ammonia gas, and the ammonia decomposition rate is 70-90%.
Furthermore, the temperature of gas nitriding is 500-550 ℃, and the time duration is 4-16 h.
Furthermore, the time of gas nitriding is 4-16 h.
Further, after the super martensitic stainless steel is placed in a nitriding furnace, nitrogen is firstly introduced to discharge air, and then ammonia gas for nitriding is introduced.
And further, after nitriding is finished, stopping heating the nitriding furnace, and cooling the obtained sample to below 50 ℃ along with the furnace and taking out the sample.
Further, the super martensitic stainless steel comprises the following elements in percentage by mass: less than or equal to 0.07 percent of C, 12.00 to 17.00 percent of Cr, 3.50 to 6.00 percent of Ni, 0.70 to 1.50 percent of Mo, less than or equal to 1.00 percent of Si, less than or equal to 1.50 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.35 percent of Cu, less than or equal to 0.03 percent of Sn, and the balance of Fe and inevitable impurity elements.
Further, the quenched super martensitic stainless steel is obtained by keeping the super martensitic stainless steel at 1100 ℃ for 60 min.
The heat treatment method can effectively eliminate the quenching residual stress of the workpiece, so that the workpiece is not easy to crack in the subsequent processing process.
Compared with the prior art, after the nitriding heat treatment is carried out on the super martensitic stainless steel, the strength and the plasticity of the material completely reach the standard, the yield strength is more than or equal to 800MPa, the tensile strength is more than or equal to 900MPa, the uniform elongation is more than or equal to 8%, the comprehensive mechanical property of the material can be fully exerted, the hardness of a carburized layer can reach 1300HV, the surface hardness of the material is maximally improved to more than 300HV, the wear resistance is greatly improved, the service life is prolonged, and the method has good economic benefits and is easy to popularize on a large scale.
Drawings
FIG. 1 is the morphology of the infiltrated layers of examples 1-3; wherein, (a) is a nitriding layer on the surface of the super martensitic stainless steel sample in the embodiment 1; (b) The surface of the super martensitic stainless steel sample in the example 2 is nitrided to form a diffusion layer; (c) The surface of the super martensitic stainless steel sample in the example 3 is nitrided to form a diffusion layer.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
In the examples below, the super martensitic stainless steel used was F6NM/SCS6/1.4313 super martensitic stainless steel.
Unless otherwise indicated, all materials or processing techniques are conventional and commercially available materials or conventional processing techniques in the art.
Example 1:
the method comprises the following steps of carrying out heat treatment on a massive 0Cr16Ni5Mo1 super martensitic stainless steel sample obtained by oil quenching after heat preservation at 1100 ℃ for 60 min:
1) Polishing an oxide layer on the surface of the sample by using abrasive paper, and cleaning oil stain by using alcohol to ensure that the surface of the sample is clean;
2) Putting the sample into an empty nitriding furnace, and introducing nitrogen for 20min to exhaust air;
3) Heating the furnace body to 510 ℃, keeping the temperature for 30 minutes, and then introducing ammonia gas;
4) Nitriding at 70% ammonia decomposition rate for 16 hours;
5) And after nitriding is finished, the sample is cooled to below 50 ℃ along with the furnace and then taken out.
Example 2:
the method comprises the following steps of carrying out heat treatment on a massive 0Cr16Ni5Mo1 super martensitic stainless steel sample obtained by oil quenching after heat preservation at 1100 ℃ for 60 min:
1) Polishing an oxide layer on the surface of the sample by using abrasive paper, and cleaning oil stain by using alcohol to ensure that the surface of the sample is clean;
2) Putting the sample into an empty nitriding furnace, and introducing nitrogen for 20min to discharge air;
3) Heating the furnace body to 500 ℃, keeping the temperature for 30 minutes, and then introducing ammonia gas;
4) Nitriding is carried out for 8 hours at an ammonia decomposition rate of 70%;
5) And after nitriding is finished, the sample is cooled to below 50 ℃ along with the furnace and then taken out.
Example 3:
the method comprises the following steps of carrying out heat treatment on a massive 0Cr16Ni5Mo1 super martensitic stainless steel sample obtained by oil quenching after heat preservation at 1100 ℃ for 60 min:
1) Polishing an oxide layer on the surface of the sample by using abrasive paper, and cleaning oil stain by using alcohol to ensure that the surface of the sample is clean;
2) Putting the sample into an empty nitriding furnace, and introducing nitrogen for 20min to exhaust air;
3) Heating the furnace body to 540 ℃, keeping the temperature for 30 minutes, and then introducing ammonia gas;
4) Nitriding at 80% ammonia decomposition rate for 2 hours;
5) And after nitriding is finished, the sample is cooled to below 50 ℃ along with the furnace and then taken out.
Comparative example 1:
the heat treatment steps of the conventional process are as follows:
1) Heating an empty quenching furnace to 1100 ℃, after the temperature is stable, putting a massive super martensitic stainless steel sample into the furnace, and preserving the temperature for 60min;
2) Taking out the sample after heat preservation, and cooling the sample in rapid quenching oil at 35 ℃ for 60min;
3) And taking out the quenched sample, putting the sample into a muffle furnace which is preheated to 510 ℃ in advance for tempering after the quenched sample is returned to the room temperature, wherein the tempering time is 16h, taking out the sample, and naturally cooling the sample to the room temperature in the air.
Comparative example 2:
the heat treatment steps of the conventional process are as follows:
1) Heating an empty quenching furnace to 1100 ℃, after the temperature is stable, putting a massive super martensitic stainless steel sample into the furnace, and preserving the temperature for 60min;
2) Taking out the sample after heat preservation, and cooling the sample in rapid quenching oil at 35 ℃ for 60min;
3) Taking out the quenched sample, putting the sample into a muffle furnace which is preheated to 500 ℃ in advance for tempering after the sample is returned to the room temperature, wherein the tempering time is 8 hours, then taking out the sample, and naturally cooling the sample to the room temperature in the air.
Comparative example 3:
the heat treatment steps of the conventional process are as follows:
1) Heating an empty quenching furnace to 1100 ℃, after the temperature is stable, putting a massive super martensitic stainless steel sample into the furnace, and preserving the temperature for 60min;
2) Taking out the sample after heat preservation, and cooling the sample in rapid quenching oil at 35 ℃ for 60min;
3) Taking out the quenched sample, putting the sample into a muffle furnace which is preheated to 540 ℃ in advance for tempering after the sample is returned to the room temperature, taking out the sample, and naturally cooling the sample to the room temperature in the air, wherein the tempering time is 2 hours.
The results of XRD residual stress examination and microhardness test were conducted on the super martensitic stainless steel samples of examples 1 to 3 and comparative example shown in Table 1, wherein "+" represents tensile stress and "-" represents compressive stress, respectively, and the samples were cut from the core and subjected to tensile test, and the results of strength and plasticity are shown in Table 2.
TABLE 1
TABLE 2
It can be seen that after the nitriding chemical heat treatment is carried out by adopting the method, the quenching residual stress of the super martensitic stainless steel sample is fully eliminated, the super martensitic stainless steel sample is completely converted into compressive stress, a stable infiltrated layer is formed, the surface hardness of the material is greatly improved, and the service life of the material is prolonged.
Example 4:
the method comprises the following steps of carrying out heat treatment on a massive 0Cr16Ni5Mo1 super martensitic stainless steel sample obtained by oil quenching after heat preservation at 1100 ℃ for 60 min:
1) Polishing an oxide layer on the surface of the sample by using abrasive paper, and cleaning oil stain by using alcohol to ensure that the surface of the sample is clean;
2) Putting the sample into an empty nitriding furnace, and introducing nitrogen for 20min to exhaust air;
3) Heating the furnace body to 530 ℃, keeping the temperature for 30 minutes, and then introducing ammonia gas;
4) Nitriding is carried out for 8 hours at an ammonia decomposition rate of 70%;
5) And after nitriding is finished, the sample is cooled to below 50 ℃ along with the furnace and then taken out.
The super martensitic stainless steel comprises the following elements in percentage by mass:
c: less than or equal to 0.07 percent, cr:15.00-17.00%, ni:3.50-5.00%, mo:0.70-1.50%, si: less than or equal to 1.00 percent, mn: less than or equal to 1.50 percent, P: less than or equal to 0.035%, S: less than or equal to 0.025%, cu: less than or equal to 0.35 percent, sn: less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.
Example 5:
the method comprises the following steps of carrying out heat treatment on a massive 0Cr16Ni5Mo1 super martensitic stainless steel sample obtained by oil quenching after heat preservation at 1100 ℃ for 60 min:
1) Polishing an oxide layer on the surface of the sample by using abrasive paper, and cleaning oil stain by using alcohol to ensure that the surface of the sample is clean;
2) Putting the sample into an empty nitriding furnace, and introducing nitrogen for 20min to exhaust air;
3) Heating the furnace body to 520 ℃, keeping the temperature for 30 minutes, and introducing ammonia gas;
4) Nitriding at an ammonia decomposition rate of 90% for 4 hours;
5) And after nitriding is finished, the sample is cooled to below 50 ℃ along with the furnace and then taken out.
The super martensitic stainless steel comprises the following elements in percentage by mass:
c: less than or equal to 0.07 percent, cr:15.00-17.00%, ni:3.50-5.00%, mo:0.70-1.50%, si: less than or equal to 1.00 percent, mn: less than or equal to 1.50 percent, P: less than or equal to 0.035%, S: less than or equal to 0.025 percent, cu: less than or equal to 0.35 percent, sn: less than or equal to 0.03 percent, and the balance of Fe and inevitable impurity elements.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A heat treatment method for eliminating quenching residual stress of super martensitic stainless steel and improving surface hardness is characterized in that the quenched super martensitic stainless steel is placed in a nitriding furnace to carry out chemical heat treatment on the surface of gas nitriding, and then the heat treatment is completed.
2. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 1, characterized in that the gas used in the gas nitriding surface chemical heat treatment process is ammonia gas, and the ammonia decomposition rate is 70-90%.
3. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 1, characterized in that the gas nitriding temperature is 500-550 ℃ and the time is 4-16 h.
4. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 3, characterized in that the gas nitriding time is 4-8 h.
5. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 1, wherein after the super martensitic stainless steel is placed in a nitriding furnace, nitrogen is introduced to discharge air, and ammonia gas for nitriding is introduced.
6. The heat treatment method for eliminating the quenching residual stress and improving the surface hardness of the super martensitic stainless steel as claimed in claim 1, wherein the super martensitic stainless steel is placed in a nitriding furnace, and an oxide layer and oil stains are removed.
7. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 6, wherein the super martensitic stainless steel is subjected to removal of an oxide layer and oil stain by sanding.
8. The heat treatment method for eliminating the quenching residual stress of the super martensitic stainless steel and improving the surface hardness as claimed in claim 1, wherein after the nitriding is finished, the nitriding furnace stops heating, and the obtained test sample is cooled to below 50 ℃ along with the furnace and taken out.
9. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 1, wherein the mass percentage of each element in the super martensitic stainless steel is as follows: less than or equal to 0.07 percent of C, 12.00 to 17.00 percent of Cr, 3.50 to 6.00 percent of Ni, 0.70 to 1.50 percent of Mo, less than or equal to 1.00 percent of Si, less than or equal to 1.50 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.35 percent of Cu, less than or equal to 0.03 percent of Sn, and the balance of Fe and inevitable impurity elements.
10. The heat treatment method for eliminating quenching residual stress and improving surface hardness of super martensitic stainless steel as claimed in claim 1, wherein the quenched super martensitic stainless steel is obtained by keeping the super martensitic stainless steel at 1100 ℃ for 60 min.
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| CN113088868A (en) * | 2020-12-28 | 2021-07-09 | 上海锐力医疗器械有限公司 | Salt bath nitriding formula and processing method of martensitic stainless steel medical suture needle |
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| CN113088868A (en) * | 2020-12-28 | 2021-07-09 | 上海锐力医疗器械有限公司 | Salt bath nitriding formula and processing method of martensitic stainless steel medical suture needle |
Non-Patent Citations (1)
| Title |
|---|
| 李明珠;赵云龙;: "提高2Cr13马氏体不锈钢疲劳强度的工艺研究", 热加工工艺, vol. 39, no. 12, 25 June 2010 (2010-06-25), pages 171 - 172 * |
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