CN115491632A - Surface treatment technology for gas shock wave soot blower nozzle buffer leaf spring - Google Patents
Surface treatment technology for gas shock wave soot blower nozzle buffer leaf spring Download PDFInfo
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- CN115491632A CN115491632A CN202211204682.9A CN202211204682A CN115491632A CN 115491632 A CN115491632 A CN 115491632A CN 202211204682 A CN202211204682 A CN 202211204682A CN 115491632 A CN115491632 A CN 115491632A
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- leaf spring
- buffer
- spray head
- shock wave
- surface treatment
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- 230000035939 shock Effects 0.000 title claims abstract description 30
- 238000005516 engineering process Methods 0.000 title claims abstract description 27
- 238000004381 surface treatment Methods 0.000 title claims abstract description 25
- 239000004071 soot Substances 0.000 title claims abstract description 23
- 238000005121 nitriding Methods 0.000 claims abstract description 24
- 150000003839 salts Chemical class 0.000 claims abstract description 24
- 238000005498 polishing Methods 0.000 claims abstract description 19
- 238000005496 tempering Methods 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims description 30
- 230000003139 buffering effect Effects 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 29
- 230000009471 action Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000035784 germination Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000002335 surface treatment layer Substances 0.000 description 1
- 230000007704 transition 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
- C23C8/02—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
-
- 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
- C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
- C23C8/42—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 liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding 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
- C23C8/80—After-treatment
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to the technical field of surface treatment, in particular to a surface treatment technology for a gas shock wave soot blower nozzle buffer leaf spring; the surface treatment technology for the gas shock wave soot blower nozzle buffer leaf spring provided by the invention can perform repeated nitriding salt bath and polishing treatment for many times after hardening and tempering, so that a workpiece is hardly deformed, the wear resistance and the corrosion resistance of the metal surface can be greatly improved, and the fatigue resistance of the leaf spring is improved.
Description
Technical Field
The invention relates to the technical field of surface treatment, in particular to a surface treatment technology for a gas shock wave soot blower nozzle buffer leaf spring.
Background
The shock wave generator of the gas shock wave soot blower can generate continuous shock waves with the intensity reaching 2.5 Mach and the duration reaching 100ms when working, the shock waves are ejected through the shock wave guide pipe and then through the vector swinging nozzle of the pneumatic telescopic rotary nozzle mechanism, the vector swinging nozzle is composed of a guide plate, a damper, a buffering and damping mechanism, a braking structure and the like, the guide plate rapidly deflects and guides the motion direction of the shock waves simultaneously under the action of the shock waves, the total deflection angle of the guide plate is 90 degrees, the linear speed of the far-end off-axis of the guide plate is accelerated to be close to 0.5 Mach from 0 degree, when the guide plate deflects by 70 degrees, the guide plate is pressed to a leaf spring of the buffering and damping mechanism through a pressing tongue on the guide plate, the leaf spring rapidly decelerates the guide plate, and the guide plate brakes when the guide plate deflects by 90 degrees.
The surface treatment technology in the invention aims to solve the problem of abrasion of the leaf spring and prolong the service life of the leaf spring.
Disclosure of Invention
The invention aims to provide a surface treatment technology for a gas shock wave soot blower nozzle buffer leaf spring, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a surface treatment technology for a gas shock wave soot blower nozzle buffer leaf spring is disclosed, wherein the treatment process for the nozzle buffer leaf spring comprises the following steps:
the method comprises the following steps: tempering the formed spray head buffer leaf spring;
step two: polishing the tempered spray head buffer leaf spring in the first step by using a machine;
step three: performing nitriding salt bath treatment on the polished spray head buffer leaf spring in the step two for 120min;
step four: polishing the sprayer buffering leaf spring processed in the third step again;
step five: performing nitriding salt bath on the nozzle buffer leaf spring in the fourth step for 90min;
step six: carrying out third polishing treatment on the nozzle buffer leaf spring again;
step seven: performing nitriding salt bath on the spray head buffer leaf spring for the third time for 60min;
step eight: carrying out fourth polishing treatment on the spray head buffer leaf spring again;
step nine: performing a fourth nitriding salt bath on the nozzle buffer leaf spring for 15min;
step ten: and (5) soaking the spray head buffering leaf spring obtained in the ninth step in oil, and then packaging.
Preferably, the temperature of the first three is 590 ℃ and the temperature of the fourth nitriding salt bath is 400 ℃ during the four nitriding salt baths.
Preferably, the head damper leaf spring after polishing must be subjected to a cleaning process.
Preferably, all of the head damper leaf springs have a roughness < Ra0.1 after polishing.
Preferably, the hardness of the tempered nozzle buffer leaf spring in the first step is HRC 45-48.
Preferably, the material of the sprayer buffering leaf spring is 30W4Cr2VA.
Preferably, the specification of the sprayer buffering leaf spring is as follows: 29mm 85mm 1.5mm, and is in the shape of a long strip straight leaf spring.
Preferably, the temperature when the nitriding salt bath is carried out does not exceed 600 ℃.
Preferably, the thickness of the compound layer on the surface of the treated nozzle buffer leaf spring can reach 20 mu, the surface hardness of the compound layer can reach HRC65-70, and the treated nozzle buffer leaf spring is extremely wear-resistant.
Preferably, the thickness of the diffusion layer formed by the treated nozzle buffer leaf spring is more than or equal to 0.5mm.
Has the advantages that:
the invention has the beneficial effects that: the invention provides a surface treatment technology for a gas shock wave soot blower nozzle buffer leaf spring.
Detailed Description
The technical solution of the present patent will be further described in detail with reference to the following embodiments.
Examples
The surface treatment technology of the spray head buffering leaf spring of the gas shock wave soot blower is characterized in that the material of the spray head buffering leaf spring is 30W4Cr2VA, the material is high-temperature resistant spring steel, the leaf spring made of the 30W4Cr2VA material can be used in an environment with the temperature of 500 ℃ at most, the 30W4Cr2VA is a necessary choice for using the environment with the temperature of 500 ℃ at most because the use environment temperature of the spray head guide plate buffering leaf spring is also 500 ℃, the tempering temperature of the tempering treatment of the 30W4Cr2VA leaf spring is 600-650 ℃, and the hardness is controlled at HRC 45-48. The direct use of the tempered leaf spring can cause the short service life of the leaf spring due to rapid abrasion, and the tempered leaf spring needs to improve the wear resistance and the shock resistance of the leaf spring through a further surface treatment technology; the surface treatment requirements include: the leaf spring of 30W4Cr2VA material is being applied to gas shock wave soot blower shower nozzle guide plate buffer, and under strong impact, the sliding friction condition of high pressure, specific leaf spring surface treatment requires: 1. wear resistance, the hardness of the surface treatment layer is improved, and the hardness of the surface layer is improved to more than HRC 60. 2. The process must not have a heating temperature exceeding the tempering temperature of the leaf spring to avoid annealing the leaf spring and a decrease in core hardness. 3. The high-hardness wear-resistant layer obtained after treatment is firmly combined with the leaf spring base layer, and the high-hardness layer cannot be peeled from the base layer due to strong impact and high-pressure sliding friction. 4. The hardness of the hardened layer formed after treatment is increased, meanwhile, the toughness cannot be lost, and the treatment result cannot bring tensile stress for reducing the fatigue life of the leaf spring substrate, and preferably can increase the fatigue life of the leaf spring;
the treatment process of the spray head buffer leaf spring comprises the following steps:
the method comprises the following steps: tempering the formed nozzle buffer leaf spring;
step two: polishing the tempered spray head buffer leaf spring in the first step by using a machine;
step three: performing nitriding salt bath treatment on the polished spray head buffer leaf spring in the step two for 120min;
step four: polishing the sprayer buffering leaf spring processed in the third step again;
step five: performing the nitriding salt bath on the spray head buffer leaf spring in the fourth step again for 90min;
step six: carrying out third polishing treatment on the nozzle buffer leaf spring again;
step seven: performing a third nitriding salt bath on the spray head buffer leaf spring for 60min;
step eight: carrying out fourth polishing treatment on the nozzle buffer leaf spring again;
step nine: performing a fourth nitriding salt bath on the nozzle buffer leaf spring for 15min;
step ten: and D, soaking the spray head buffering leaf spring obtained in the ninth step in oil, and then packaging.
Further, in the course of conducting the nitriding salt bath four times, the temperature of the first three times was 590 ℃, and the temperature of the fourth nitriding salt bath was 400 ℃.
Further, the head damper leaf spring after polishing must be subjected to a cleaning process.
Further, all the head damper leaf springs had a roughness < Ra0.1 after polishing.
Furthermore, the hardness of the spray head buffering leaf spring after tempering in the first step is HRC 45-48.
Further, the material of the sprayer buffering leaf spring is 30W4Cr2VA.
Further, the specification of the nozzle buffer leaf spring is as follows: the rectangular straight leaf spring with the thickness of 29mm multiplied by 85mm multiplied by 1.5mm is used, the opening of one end of the leaf spring is fixed by a screw and a gasket, the other end of the leaf spring is a tongue pressing action area of the guide plate, and after the tongue pressing action is acted on the specific area of the leaf spring, the rectangular straight leaf spring is gradually bent to generate buffering and decelerating actions on the guide plate.
Further, the temperature when the nitriding salt bath is carried out does not exceed 600 ℃.
Furthermore, the thickness of the compound layer on the surface of the treated nozzle buffer leaf spring can reach 20 mu, the surface hardness of the compound layer can reach HRC65-70, and the nozzle buffer leaf spring is extremely wear-resistant.
Furthermore, the thickness of the diffusion layer formed by the treated nozzle buffer leaf spring is more than or equal to 0.5mm.
The process technology solves the technical advantages of wear resistance, impact resistance and fatigue resistance of the buffering leaf spring of the spray head of the gas shock wave soot blower: 1. the processed leaf spring of the 30W4Cr2VA material is wear-resistant, the thickness of a compound layer on the surface of the leaf spring can reach 20 mu, the surface hardness of the compound layer can reach HRC65-70, and the leaf spring is extremely wear-resistant.
2. The composite material has impact resistance, a compound layer is generated by modifying the iron alloy element of a 30W4Cr2VA material, a diffusion layer is formed between the compound layer and a leaf spring base material, the thickness of the diffusion layer reaches 0.2-0.5mm, the hardness of the diffusion layer is in step transition from the high hardness (HRC 65-70) of the compound layer to the hardness (HEC 45-48) of the base layer, and no step change of hardness exists in the middle. When the surface of the leaf spring bears strong impact, the situation that the compound layer is deformed, crushed and peeled off due to impact depression of the thinner compound layer because the base layer is relatively soft can not be generated.
3. The fatigue resistance, the formation of a diffusion layer and the gradient reduction of hardness bring beneficial compressive stress, and the QPQ treatment process of the salt bath at 500-600 ℃ also inhibits and eliminates any tensile stress germination when the compound and the diffusion layer are formed. The gradient properties of the compression stress and the diffusion layer can provide stress support for resisting bending tensile stress for the high-hardness compound layer when the leaf spring is bent, the generation probability of tensile stress cracks of the compound layer is reduced, the toughness of the compound layer is improved, and the fatigue life of the leaf spring is greatly prolonged.
4. The leaf spring of the 30W4Cr2VA material is not annealed, the temperature of the nitriding salt bath is not more than 600 ℃, and is less than the tempering temperature of the leaf spring of the 30W4Cr2VA material. The treatment of the process can not reduce the hardness of the base material of the leaf spring of the 30W4Cr2VA material;
the invention provides a surface treatment technology for a gas shock wave soot blower nozzle buffer leaf spring. The technological process realizes the combination of nitriding and oxidizing, the combination of nitride and oxide, the combination of wear resistance and corrosion resistance, and the combination of heat treatment technology and anticorrosion technology.
The embodiments described above are preferred embodiments of the present invention, and not all embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A technology for processing the surface of a gas shock wave soot blower nozzle buffer leaf spring is characterized in that the processing technology of the nozzle buffer leaf spring is carried out according to the following steps:
the method comprises the following steps: tempering the formed nozzle buffer leaf spring;
step two: polishing the tempered spray head buffer leaf spring in the first step by using a machine;
step three: performing nitriding salt bath treatment on the polished spray head buffer leaf spring in the step two for 120min;
step four: polishing the sprayer buffering leaf spring processed in the third step again;
step five: performing the nitriding salt bath on the spray head buffer leaf spring in the fourth step again for 90min;
step six: carrying out third polishing treatment on the nozzle buffer leaf spring again;
step seven: performing a third nitriding salt bath on the spray head buffer leaf spring for 60min;
step eight: carrying out fourth polishing treatment on the nozzle buffer leaf spring again;
step nine: performing a fourth nitriding salt bath on the nozzle buffer leaf spring for 15min;
step ten: and D, soaking the spray head buffering leaf spring obtained in the ninth step in oil, and then packaging.
2. The surface treatment technology of the leaf spring buffer of the spray head of the gas shock wave soot blower as claimed in claim 1, characterized in that: in the course of conducting the nitriding salt bath four times, the temperature of the first three times was 590 ℃, and the temperature of the fourth nitriding salt bath was 400 ℃.
3. The surface treatment technology for the gas shock wave soot blower nozzle buffer leaf spring as claimed in claim 1, characterized in that: after polishing, the roughness of all the head damper leaf springs was < ra0.1.
4. The surface treatment technology of the leaf spring buffer of the spray head of the gas shock wave soot blower as claimed in claim 1, characterized in that: the head damper leaf spring after polishing must be subjected to a cleaning process.
5. The surface treatment technology of the leaf spring buffer of the spray head of the gas shock wave soot blower as claimed in claim 1, characterized in that: the hardness of the tempered spray head buffer leaf spring in the first step is HRC 45-48.
6. The surface treatment technology of the leaf spring buffer of the spray head of the gas shock wave soot blower as claimed in claim 1, characterized in that: the material of the sprayer buffering leaf spring is 30W4Cr2VA.
7. The surface treatment technology of the leaf spring buffer of the spray head of the gas shock wave soot blower as claimed in claim 1, characterized in that: the specification of the spray head buffer leaf spring is as follows: 29mm × 85mm × 1.5mm, and is in the shape of a strip-shaped straight leaf spring.
8. The surface treatment technology for the gas shock wave soot blower nozzle buffer leaf spring as claimed in claim 1, characterized in that: the temperature during the nitriding salt bath does not exceed 600 ℃.
9. The surface treatment technology for the gas shock wave soot blower nozzle buffer leaf spring as claimed in claim 1, characterized in that: the thickness of the compound layer on the surface of the treated nozzle buffer leaf spring can reach 20 mu, the surface hardness of the compound layer can reach HRC65-70, and the nozzle buffer leaf spring is extremely wear-resistant.
10. The surface treatment technology of the leaf spring buffer of the spray head of the gas shock wave soot blower as claimed in claim 1, characterized in that: the thickness of the diffusion layer formed by the treated nozzle buffer leaf spring is more than or equal to 0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211204682.9A CN115491632A (en) | 2022-09-29 | 2022-09-29 | Surface treatment technology for gas shock wave soot blower nozzle buffer leaf spring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211204682.9A CN115491632A (en) | 2022-09-29 | 2022-09-29 | Surface treatment technology for gas shock wave soot blower nozzle buffer leaf spring |
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| CN115491632A true CN115491632A (en) | 2022-12-20 |
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| CN202211204682.9A Pending CN115491632A (en) | 2022-09-29 | 2022-09-29 | Surface treatment technology for gas shock wave soot blower nozzle buffer leaf spring |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080092142A (en) * | 2007-04-11 | 2008-10-15 | 김익희 | Method for treat of heat resisting steel by gas nitriding |
| CN103194701A (en) * | 2013-04-28 | 2013-07-10 | 东莞市铝美铝型材有限公司 | Production process for aluminium alloy profile |
| CN105483609A (en) * | 2015-12-23 | 2016-04-13 | 四川全丰新材料科技有限公司 | Circulating QPQ treatment technology of high-speed steel tool |
| CN108359785A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches |
| KR102330937B1 (en) * | 2020-05-22 | 2021-11-24 | 동의대학교 산학협력단 | Method for manufacturing martensitic precipitation hardening stainless steel for improving corrosion resistance and surface hardness and method for surface treatment of cable protector |
-
2022
- 2022-09-29 CN CN202211204682.9A patent/CN115491632A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080092142A (en) * | 2007-04-11 | 2008-10-15 | 김익희 | Method for treat of heat resisting steel by gas nitriding |
| CN103194701A (en) * | 2013-04-28 | 2013-07-10 | 东莞市铝美铝型材有限公司 | Production process for aluminium alloy profile |
| CN105483609A (en) * | 2015-12-23 | 2016-04-13 | 四川全丰新材料科技有限公司 | Circulating QPQ treatment technology of high-speed steel tool |
| CN108359785A (en) * | 2018-03-19 | 2018-08-03 | 盐城工学院 | A kind of strengthening and toughening treatment method of W6Mo5Cr4V2 high-speed steel broaches |
| KR102330937B1 (en) * | 2020-05-22 | 2021-11-24 | 동의대학교 산학협력단 | Method for manufacturing martensitic precipitation hardening stainless steel for improving corrosion resistance and surface hardness and method for surface treatment of cable protector |
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