CN111962014A - Stainless steel strengthening heat treatment process and heat treatment nitriding furnace - Google Patents
Stainless steel strengthening heat treatment process and heat treatment nitriding furnace Download PDFInfo
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- CN111962014A CN111962014A CN202010919885.0A CN202010919885A CN111962014A CN 111962014 A CN111962014 A CN 111962014A CN 202010919885 A CN202010919885 A CN 202010919885A CN 111962014 A CN111962014 A CN 111962014A
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- 238000005121 nitriding Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000010935 stainless steel Substances 0.000 title claims abstract description 49
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 49
- 230000008569 process Effects 0.000 title claims abstract description 41
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 238000005728 strengthening Methods 0.000 title claims abstract description 11
- 239000006104 solid solution Substances 0.000 claims abstract description 14
- 238000010791 quenching Methods 0.000 claims abstract description 6
- 230000000171 quenching effect Effects 0.000 claims abstract description 6
- 238000005496 tempering Methods 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 45
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000005192 partition Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 150000004767 nitrides Chemical class 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000005255 carburizing Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
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- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- 239000004753 textile Substances 0.000 description 1
- 229910003470 tongbaite Inorganic materials 0.000 description 1
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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
- C23C8/06—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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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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- 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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
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- 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
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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Abstract
The invention discloses a stainless steel strengthening heat treatment process, which comprises the following steps of (1) treating a stainless steel by using a temperature of 2010 DEG F and a pressure: 110 KPa; 1920 DEG F-1980 DEG F, pressure: 110 KPa; temperature: 750 ° f; the three-stage environmental control is adopted to carry out the treatment of solid solution nitriding, secondary quenching and tempering on the stainless steel, so that the depth of a high-concentration solid solution nitriding layer can be greatly deepened, the generation of nitrides CrN and Cr2N is avoided, and the corrosion resistance of a workpiece is greatly improved.
Description
Technical Field
The invention relates to the technical field of surface strengthening treatment processes, in particular to a stainless steel strengthening heat treatment process and a heat treatment nitriding furnace.
Background
Stainless steel materials are widely applied in the industrial field, and have the characteristics of low hardness, poor wear resistance and easy occlusion, and particularly, the stainless steel fasteners are frequently scratched and seized by threads in application. In order to enhance the strength of stainless steel materials and to strengthen mechanical properties such as hardness and wear resistance, a general treatment method is to carburize and nitride the stainless steel materials. However, the traditional surface treatment technology such as carburizing and nitriding process can improve the hardness of the stainless steel, generate chromium carbide precipitate and reduce the corrosion resistance of the stainless steel. The following process disadvantages exist:
carburization temperatures at 1470F (800℃.) to 2100F (1150℃.) reduce the corrosion resistance of stainless steel materials due to the formation of carbides Cr23C6 and Cr7C 3.
Nitriding temperatures range from 900F (480 ℃) to 1650F (900 ℃), which also reduces the corrosion resistance of stainless steel due to the formation of nitrides CrN and Cr 2N.
Therefore, the invention provides a process heat treatment process capable of improving the corrosion resistance of nitrided stainless steel so as to improve the application prospect of the stainless steel.
Disclosure of Invention
The invention aims to: provides a stainless steel strengthening heat treatment process capable of improving the corrosion resistance of nitriding heat treatment stainless steel.
The technical scheme adopted by the invention is as follows:
a stainless steel strengthening heat treatment process comprises the following steps:
s1: placing stainless steel in a nitriding furnace;
s2: adjusting the process parameters in the nitriding furnace to the following temperature: 2010 ° f, pressure: 110KPa, carrying out solid solution nitriding treatment on stainless steel;
s3: adjusting the process parameters in the nitriding furnace to the following temperature: 1920 DEG F-1980 DEG F, pressure: 110KPa, lasting for 45min-1h, and carrying out secondary quenching treatment on the stainless steel;
s4: adjusting the process parameters in the nitriding furnace to the following temperature: 750 DEG F, for 45min-2h, tempering the stainless steel.
Since the solubility of diatomic gases in metals at constant temperature is proportional to the square root of the partial pressure of the gas, the surface nitrogen concentration and the depth of nitrogen solid solution depend on two factors:
(1) the content of alloy elements in the stainless steel;
(2) nitrogen partial pressure: the relationship between surface nitrogen concentration and nitrogen partial pressure is: NS to volume of pN2 (root)
The nitriding process forms N-atom aggregation/-phase at 750 DEG F (400 ℃) to 840 DEG F (450 ℃);
the carburizing process comprises the steps of (1) carburizing at 660 DEG F (350 ℃) to 840 DEG F (450 ℃), wherein the content of supersaturated austenite is 2-3%;
at 1920 DEG F (1050 ℃) to 2100 DEG F (1150 ℃), austenite has a high solubility for nitrogen, forming a solid solution nitrided layer of high concentration.
Therefore, the process greatly deepens the depth of the high-concentration solid solution nitriding layer by controlling the nitriding pressure and temperature and by an innovative three-stage treatment method of solid solution nitriding, secondary quenching and tempering, avoids generating nitrides CrN and Cr2N, reduces the corrosion resistance of the stainless steel, improves the application scene and the service life of the stainless steel, and is suitable for popularization and use.
Preferably, the step S2 process lasts for 2-4 h. The thickness of a nitriding layer can be ensured by the solid solution nitriding treatment for 2-4 hours, and the surface hardness of the stainless steel is ensured.
In addition, the invention also discloses a heat treatment nitriding furnace, which comprises a base, a furnace cover and a cover lifting structure, and is characterized in that the cover lifting structure is suitable for controlling the furnace cover, and a sealing structure is arranged between the furnace cover and the base; a partition plate is arranged in the middle of the base and divides the base into a reaction cavity and an adjusting cavity from top to bottom; a vacuum pump and a nitrogen pipe which are communicated with the reaction cavity are arranged in the adjusting cavity; an anode furnace ring is arranged in the reaction cavity, a cathode interface is arranged at the middle position of the anode furnace, and a control box electrically connected with the anode furnace ring and the cathode interface is arranged in the adjusting cavity; and a mounting seat matched with the cathode interface is arranged in the furnace cover. The base, the bell and the setting of lifting the lid structure, be convenient for arrange pending material in the cavity, seal structure's setting, be used for guaranteeing the internal pressure of cavity, adjust the setting of intracavity vacuum pump and nitrogen gas pipe, then be used for with the leading-in reaction intracavity of nitrogen gas, and simultaneously, take out the cavity to vacuum, avoid the air to cause the influence to the nitriding process, anode furnace circle and cathode interface, the setting of mount pad, be used for controlling the nitriding environment, furthermore, the tradition scheme is on directly arranging the negative plate in the middle of the reaction intracavity with the raw materials, this scheme passes through the cooperation of mount pad with the cathode interface, only need with the material arrange in on the mount pad can, avoid getting of material to put the in-process, contact with furnace chamber high temperature, the safety performance is improved.
Preferably, the sealing structure comprises a sealing protrusion arranged on the base, and a sealing groove matched with the sealing protrusion is arranged on the furnace cover. The cooperation of sealed arch and sealed recess can be sealed the junction of base with the bell, avoids the intracavity to pass through space and external contact, the pressure deviation appears.
Preferably, be provided with the function groove on the sealed arch, function tank bottom end is provided with the ear groove to the inside extension, be provided with on the sealed lug with the locking groove of ear groove intercommunication, it is provided with the locking piece to slide in the locking groove, be provided with on the locking piece with ear groove complex through-hole, be provided with in the locking groove with the fixed pressure spring that the locking piece is connected, the function inslot cooperation is provided with the sealing washer, the locking piece is applicable to sealed lug with will under the cooperation state of sealed recess the sealing washer sticiss. The sealing ring with the same structure can be placed in the functional groove and the upper lug groove of the functional groove, and the sealing ring can be pressed when the sealing groove is matched with the sealing lug through the matching of the locking groove, the locking block and the fixed pressure spring, so that the sealing effect of the device is further improved.
Preferably, the bottom end of the mounting seat is provided with a wiring groove matched with the cathode interface, the mounting seat is further provided with a connecting rod, the connecting rod is fixedly connected with the top end of the furnace cover, and the mounting seat is further provided with a clamping structure. The setting of mount pad bottom wiring groove, with the negative pole interface cooperation back, can regard the mount pad whole as the negative plate, form the plasma region between the negative and positive poles, under the strong electric field effect of plasma region, the positive ion of nitrogen and hydrogen is with high-speed to the workpiece surface bombardment, the high kinetic energy of ion changes into heat energy, heat workpiece surface to required temperature, because the bombardment of ion, workpiece surface produces the atom sputtering, therefore obtain the purification, simultaneously because adsorption and diffusion effect, nitrogen is organized the infiltration workpiece surface, the nitriding effect has further been improved.
Preferably, the clamping structure comprises two clamping blocks which are symmetrically arranged, a clamping groove is formed in the middle position, facing the mounting seat, of each clamping block, clamping heads are connected in the clamping grooves in a sliding mode, and clamping compression springs connected with the clamping heads are arranged at the bottom ends of the clamping grooves. The clamping groove, the clamping head and the clamping pressure spring are arranged, the clamping head can indirectly act on a workpiece through the elasticity of the pressure spring so as to fix the workpiece, the clamping head can replace the workpieces in different shapes according to conditions, and the workpiece can be fixed through the arrangement of the clamping structure, so that the workpiece is prevented from falling and rolling, and the nitriding effect is prevented from being influenced.
Preferably, a water flow layer and an air layer are sequentially arranged in the wall body of the furnace cover from inside to outside, and a water inlet and a water outlet communicated with the water flow layer are further arranged on the furnace cover. The setting on rivers layer is convenient for at the switching in-process of different nitriding processes environment, cools down to the furnace body, improves the control by temperature change effect, and the setting of air bed then can play heat retaining effect, and it is great to avoid the fluctuation of temperature in the furnace body to change, further improves the stability of nitriding process.
Preferably, the cover lifting structure comprises a vertically arranged cover lifting telescopic rod, a movable seat is arranged at the piston end of the cover lifting telescopic rod, a rotating motor is arranged in the movable seat, a middle block is further arranged on the movable seat, a rotating shaft of the rotating motor penetrates through the movable seat and is connected with the middle block, and a transmission rod connected with the furnace cover is arranged on the middle block. The arrangement of the cover lifting telescopic rod, the movable seat and the rotating electrode can realize the purposes of lifting the furnace cover and rotating the furnace cover through the transmission of the middle block and the transmission rod, and is convenient for putting, taking out and replacing the processed products, and the use is convenient.
Preferably, one end of the movable seat close to the middle block is provided with a ball groove, a support ball is arranged in the ball groove, and the support ball is in contact with the middle block. The ball groove and the internal supporting balls are used for supporting the middle block, so that the middle block is prevented from being stressed and directly acting on the rotating shaft of the rotating electrode, and the service life of the rotating shaft is prolonged.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the nitriding pressure and temperature are controlled, and the innovative three-stage treatment method of solid solution nitriding, secondary quenching and tempering is adopted, so that the depth of a high-concentration solid solution nitriding layer is greatly deepened, the generation of nitrides CrN and Cr2N is avoided, and the corrosion resistance of stainless steel is reduced, therefore, the method is a brand-new heat treatment method for avoiding the corrosion resistance reduction of the stainless steel, solves the problem of the corrosion resistance reduction of the stainless steel material in the carburizing and nitriding strengthening processes, and can be widely applied to the industries of engineering machinery, chemical engineering, textile machinery, food processing industry, dairy product industry, mechanical engineering, marine equipment, household kitchen and toilet equipment, medical instruments and the like.
2. According to the invention, through the matching of the mounting seat and the cathode interface, only materials are required to be placed on the mounting seat, so that the contact between an operator and a high-temperature furnace chamber in the material taking and placing process is avoided, the safety performance is improved, and the use is convenient.
3. According to the invention, through the arrangement of the clamping structure on the mounting seat, the workpiece can be fixed, the workpiece is prevented from falling and rolling, the nitriding effect is prevented from being influenced, and meanwhile, the workpiece is prevented from falling in the transportation process.
4. According to the invention, through the arrangement of the cover lifting telescopic rod, the movable seat and the rotating electrode, the purposes of lifting and rotating the furnace cover can be realized through the transmission of the middle block and the transmission rod, the processed product is convenient to put in, take out and replace, and the use is convenient.
5. According to the invention, through the matching of the locking groove, the locking block and the fixed pressure spring, the sealing ring can be pressed when the sealing groove is matched with the sealing lug, so that the sealing effect of the device is further improved, meanwhile, the separation of the sealing ring is prevented, and the stability of the device is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic cross-sectional structure of the present invention.
Fig. 2 is an enlarged schematic view of region a in fig. 1.
Fig. 3 is an enlarged schematic view of the region B in fig. 1.
Fig. 4 is an enlarged schematic view of region C in fig. 1.
The labels in the figure are: 1-base, 2-furnace cover, 3-baffle, 4-reaction chamber, 5-regulating chamber, 6-vacuum pump, 7-nitrogen gas pipe, 8-anode furnace ring, 9-cathode interface, 10-control box, 11-mounting seat, 12-sealing projection, 13-sealing groove, 14-functional groove, 15-lug groove, 16-locking groove, 17-locking block, 18-through hole, 19-fixing pressure spring, 20-sealing ring, 21-wiring groove, 22-connecting rod, 23-clamping block, 24-clamping groove, 25-clamping head, 26-clamping pressure spring, 27-water flow layer, 28-air layer, 29-water inlet, 30-water outlet, 31-lifting cover telescopic rod, 32-movable seat, 33-rotating motor, 24-middle block, 25-transmission rod, 26-ball groove, 27-supporting ball.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, 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 of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
A stainless steel strengthening heat treatment process comprises the following steps:
s1: placing stainless steel in a nitriding furnace;
s2: adjusting the process parameters in the nitriding furnace to the following temperature: 2010 ° f, pressure: 110KPa, and carrying out solid solution nitriding treatment on the stainless steel for 3 hours;
s3: adjusting the process parameters in the nitriding furnace to the following temperature: 1920 DEG F-1980 DEG F, pressure: 110KPa, lasting for 1h, and carrying out secondary quenching treatment on the stainless steel;
s4: adjusting the process parameters in the nitriding furnace to the following temperature: 750 ℃ F. for 1h, the stainless steel was tempered.
The performance of the stainless steel treated by the process is detected, and the detection result is as follows:
the nitrogen solid solution depth is 0.2-2.5 mm, which is far higher than the thickness of the nitriding layer with the conventional nitriding of 30-50 μm;
surface hardness: 54-61 HRC;
200-350HV for austenitic steel and dual-phase steel;
the results prove that the process forms a solid solution nitriding layer with a deeper thickness on the surface of the stainless steel part, the nitriding layer has higher nitrogen concentration without Cr deposition, higher strength of the nitriding layer is formed, and the performance of the stainless steel can be effectively changed: the treated stainless steel part has higher erosion resistance and improved corrosion resistance; the friction coefficient can be reduced due to higher compressive stress of the workpiece; in addition, the workpiece has higher hardness, the wear resistance is improved, and the wear is reduced; the fatigue strength under alternating stress can be improved.
In addition, the embodiment also discloses a heat treatment nitriding furnace, as shown in fig. 1-4, comprising a base 1, a furnace cover 2 and a cover-lifting structure, wherein the cover-lifting structure is suitable for controlling the furnace cover 2; a water flow layer 27 and an air layer 28 are sequentially arranged in the wall body of the furnace cover 2 from inside to outside, and a water inlet 29 and a water outlet 30 which are communicated with the water flow layer 27 are also arranged on the furnace cover 2; a sealing bulge 12 is arranged on the base 1, and a sealing groove 13 matched with the sealing bulge 12 is arranged on the furnace cover 2; a functional groove 14 is formed in the sealing protrusion 12, an ear groove 15 is formed in the bottom end of the functional groove 14 in an inward extending mode, a locking groove 16 communicated with the ear groove 15 is formed in the sealing protrusion, a locking block 17 is arranged in the locking groove 16 in a sliding mode, a through hole 18 matched with the ear groove 15 is formed in the locking block 17, a fixed pressure spring 19 connected with the locking block 17 is arranged in the locking groove 16, a sealing ring 20 is arranged in the functional groove 14 in a matching mode, and the locking block 17 is suitable for tightly pressing the sealing ring 20 in the matching state of the sealing protrusion and the sealing groove 13; a partition plate 3 is arranged in the middle of the base 1, and the base 1 is divided into a reaction cavity 4 and an adjusting cavity 5 from top to bottom by the partition plate 3; a vacuum pump 6 and a nitrogen pipe 7 which are communicated with the reaction cavity 4 are arranged in the adjusting cavity 5; an anode furnace ring 8 is arranged in the reaction chamber 4, a cathode interface 9 is arranged at the middle position of the anode furnace, and a control box 10 electrically connected with the anode furnace ring 8 and the cathode interface 9 is arranged in the adjusting chamber 5; a mounting seat 11 is arranged in the furnace cover 2, a wiring groove 21 matched with the cathode interface 9 is arranged at the bottom end of the mounting seat 11, a connecting rod 22 is further arranged on the mounting seat 11, the connecting rod 22 is fixedly connected with the top end of the furnace cover 2, two clamping blocks 23 are symmetrically arranged on the mounting seat 11, a clamping groove 24 is arranged on the clamping block 23 at the middle position facing the mounting seat 11, a clamping head 25 is connected in the clamping groove 24 in a sliding manner, and a clamping pressure spring 26 connected with the clamping head 25 is arranged at the bottom end of the clamping groove 24; the cover lifting structure comprises a cover lifting telescopic rod 31 which is vertically arranged, a movable seat 32 is arranged at the piston end of the cover lifting telescopic rod 31, a rotating motor 33 is arranged in the movable seat 32, a middle block 24 is also arranged on the movable seat 32, the rotating shaft of the rotating motor 33 penetrates through the movable seat 32 to be connected with the middle block 24, and a transmission rod 25 connected with the furnace cover 2 is arranged on the middle block 24; one end of the movable seat 32 close to the middle block 24 is further provided with a ball groove 26, a support ball 27 is arranged in the ball groove 26, and the support ball 27 is in contact with the middle block 24.
During the use process, firstly, stainless steel is placed on the mounting seat 11 and clamped by the clamping head, then the rotating motor 33 is controlled to rotate the furnace cover 2 to a position matched with the base 1, the cover lifting telescopic rod 31 is controlled to withdraw immediately, the furnace cover 2 descends to be covered with the base 1, in the process, the furnace cover 2 can push the locking block 17 to clamp the sealing ring 20 positioned at the ear groove 15 to avoid the separation of the sealing ring 20, meanwhile, the top end of the sealing ring 20 is pressed by the sealing groove 13 to further ensure the sealing effect, then, air in the furnace body is pumped out by the vacuum pump 6, a proper amount of nitrogen is introduced by the nitrogen pipe 7, the anode furnace and the cathode structure are electrified by the control box 10, the nitriding operation of the stainless steel can be normally carried out, after the operation is finished, all devices are only required to be closed, cooling water is introduced into the furnace cover 2 from the water inlet 29, and when the temperature and the pressure of the furnace, the cover lifting telescopic rod 31 is controlled to extend out, the mounting seat 11 and the stainless steel can be taken out together through the connecting rod 22, after the driving motor deflects by an angle, the stainless steel product can be normally taken down, and meanwhile, the next product is put in, so that the problem that a user takes materials from the inside of the furnace body is avoided, potential safety hazards are eliminated, the practicability is high, and the cover lifting telescopic rod is suitable for popularization and use.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A stainless steel strengthening heat treatment process is characterized by comprising the following steps:
s1: placing stainless steel in a nitriding furnace;
s2: adjusting the process parameters in the nitriding furnace to the following temperature: 2010 ° f, pressure: 110KPa, carrying out solid solution nitriding treatment on stainless steel;
s3: adjusting the process parameters in the nitriding furnace to the following temperature: 1920 DEG F-1980 DEG F, pressure: 110KPa, lasting for 45min-1h, and carrying out secondary quenching treatment on the stainless steel;
s4: adjusting the process parameters in the nitriding furnace to the following temperature: 750 DEG F, for 45min-2h, tempering the stainless steel.
2. The strengthening heat treatment process for stainless steel according to claim 1, wherein the step S2 process lasts for 2-4 h.
3. A heat treatment nitriding furnace comprising a base (1), a lid (2) and a lid-lifting structure, characterized in that said lid-lifting structure is adapted to control said lid (2), wherein:
a sealing structure is arranged between the furnace cover (2) and the base (1);
a partition plate (3) is arranged in the middle of the base (1), and the base (1) is divided into a reaction cavity (4) and an adjusting cavity (5) from top to bottom by the partition plate (3);
a vacuum pump (6) and a nitrogen pipe (7) which are communicated with the reaction cavity (4) are arranged in the adjusting cavity (5);
an anode furnace ring (8) is arranged in the reaction cavity (4), a cathode interface (9) is arranged at the middle position of the anode furnace, and a control box (10) electrically connected with the anode furnace ring (8) and the cathode interface (9) is arranged in the adjusting cavity (5);
and a mounting seat (11) matched with the cathode interface (9) is arranged in the furnace cover (2).
4. A heat treatment nitriding furnace according to claim 3, characterized in that the sealing structure comprises a sealing protrusion (12) arranged on the base (1), and the furnace lid (2) is provided with a sealing groove (13) cooperating with the sealing protrusion (12).
5. The heat treatment nitriding furnace according to claim 4, wherein the sealing protrusion (12) is provided with a functional groove (14), the bottom end of the functional groove (14) extends inwards to form an ear groove (15), the sealing protrusion is provided with a locking groove (16) communicated with the ear groove (15), the locking groove (16) is provided with a locking block (17) in a sliding manner, the locking block (17) is provided with a through hole (18) matched with the ear groove (15), the locking groove (16) is provided with a fixed compression spring (19) connected with the locking block (17), the functional groove (14) is internally provided with a sealing ring (20) in a matching manner, and the locking block (17) is suitable for compressing the sealing ring (20) under the matching state of the sealing protrusion and the sealing groove (13).
6. A heat treatment nitriding furnace according to claim 3, characterized in that the bottom end of the mounting seat (11) is provided with a wiring groove (21) matching with the cathode interface (9), the mounting seat (11) is further provided with a connecting rod (22), the connecting rod (22) is fixedly connected with the top end of the furnace cover (2), and the mounting seat (11) is further provided with a clamping structure.
7. The heat treatment nitriding furnace according to claim 6, wherein the clamping structure comprises two symmetrically arranged clamping blocks (23), a clamping groove (24) is arranged on the clamping blocks (23) towards the middle position of the mounting seat (11), a clamping head (25) is slidably connected in the clamping groove (24), and a clamping compression spring (26) connected with the clamping head (25) is arranged at the bottom end of the clamping groove (24).
8. A heat treatment nitriding furnace according to claim 3, characterized in that a water flow layer (27) and an air layer (28) are arranged in the wall of the furnace cover (2) from inside to outside in sequence, and a water inlet (29) and a water outlet (30) which are communicated with the water flow layer (27) are arranged on the furnace cover (2).
9. The nitriding furnace according to claims 3-8, wherein the cover-lifting structure comprises a cover-lifting telescopic rod (31) vertically arranged, a movable seat (32) is arranged at the piston end of the cover-lifting telescopic rod (31), a rotating motor (33) is arranged in the movable seat (32), an intermediate block (24) is further arranged on the movable seat (32), the rotating shaft of the rotating motor (33) penetrates through the movable seat (32) to be connected with the intermediate block (24), and a transmission rod (25) connected with the furnace cover (2) is arranged on the intermediate block (24).
10. A heat treatment nitriding furnace according to claim 9, characterized in that the movable seat (32) is provided with a ball groove (26) at an end near the intermediate block (24), and a support ball (27) is provided in the ball groove (26), and the support ball (27) is provided in contact with the intermediate block (24).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113211010A (en) * | 2021-05-06 | 2021-08-06 | 昆山缔微致精密电子有限公司 | Production process of workpiece rapid clamping jig |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
| CN115466922A (en) * | 2022-09-13 | 2022-12-13 | 长春工业大学 | High-strength high-toughness high-corrosion-resistance stainless steel material and preparation method and application thereof |
| CN117144286A (en) * | 2023-06-01 | 2023-12-01 | 南京华尔泰传动科技有限公司 | Gear tooth surface nitriding treatment equipment |
| CN117488046A (en) * | 2023-10-26 | 2024-02-02 | 烟台大学 | Heat treatment device and method for realizing high-hardness wear-resistant 60NiTi alloy |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107187A (en) * | 1993-10-05 | 1995-08-23 | 汉斯·博恩 | Surface carburization method for forming austenite having high strength in rustless steel |
| CN2737805Y (en) * | 2004-06-07 | 2005-11-02 | 大连海事大学 | Ion-nitriding furnace |
| CN101994118A (en) * | 2009-08-11 | 2011-03-30 | 顾安民 | Heat treatment method for steel pieces |
| CN203794971U (en) * | 2014-04-18 | 2014-08-27 | 江苏海事职业技术学院 | Well-type carbonitriding furnace |
| CN104651568A (en) * | 2015-02-12 | 2015-05-27 | 浙江省长兴精工电炉制造有限公司 | High-precision atmosphere protection programmed tempering furnace |
| CN104894507A (en) * | 2015-04-28 | 2015-09-09 | 山东科技大学 | Stainless steel sieve plate high temperature permeability dissolving nitrogen treatment method |
| CN105694918A (en) * | 2016-03-09 | 2016-06-22 | 浙江尚鼎工业炉有限公司 | Rotating pyrolysis furnace |
| CN210367881U (en) * | 2019-07-30 | 2020-04-21 | 苏州市昶智热处理有限公司 | Novel sealed controllable carburizing furnace |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
-
2020
- 2020-09-04 CN CN202010919885.0A patent/CN111962014B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1107187A (en) * | 1993-10-05 | 1995-08-23 | 汉斯·博恩 | Surface carburization method for forming austenite having high strength in rustless steel |
| CN2737805Y (en) * | 2004-06-07 | 2005-11-02 | 大连海事大学 | Ion-nitriding furnace |
| CN101994118A (en) * | 2009-08-11 | 2011-03-30 | 顾安民 | Heat treatment method for steel pieces |
| CN203794971U (en) * | 2014-04-18 | 2014-08-27 | 江苏海事职业技术学院 | Well-type carbonitriding furnace |
| CN104651568A (en) * | 2015-02-12 | 2015-05-27 | 浙江省长兴精工电炉制造有限公司 | High-precision atmosphere protection programmed tempering furnace |
| CN104894507A (en) * | 2015-04-28 | 2015-09-09 | 山东科技大学 | Stainless steel sieve plate high temperature permeability dissolving nitrogen treatment method |
| CN105694918A (en) * | 2016-03-09 | 2016-06-22 | 浙江尚鼎工业炉有限公司 | Rotating pyrolysis furnace |
| CN210367881U (en) * | 2019-07-30 | 2020-04-21 | 苏州市昶智热处理有限公司 | Novel sealed controllable carburizing furnace |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
Non-Patent Citations (1)
| Title |
|---|
| 庄光山等: ""不锈钢的固溶渗氮"", 《国外金属热处理》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113211010A (en) * | 2021-05-06 | 2021-08-06 | 昆山缔微致精密电子有限公司 | Production process of workpiece rapid clamping jig |
| CN114481011A (en) * | 2021-12-31 | 2022-05-13 | 锦州捷通铁路机械股份有限公司 | Solid nitriding process for surface strengthening of hot die steel with low deformation |
| CN115466922A (en) * | 2022-09-13 | 2022-12-13 | 长春工业大学 | High-strength high-toughness high-corrosion-resistance stainless steel material and preparation method and application thereof |
| CN117144286A (en) * | 2023-06-01 | 2023-12-01 | 南京华尔泰传动科技有限公司 | Gear tooth surface nitriding treatment equipment |
| CN117144286B (en) * | 2023-06-01 | 2024-03-26 | 南京华尔泰传动科技有限公司 | Gear tooth surface nitriding treatment equipment |
| CN117488046A (en) * | 2023-10-26 | 2024-02-02 | 烟台大学 | Heat treatment device and method for realizing high-hardness wear-resistant 60NiTi alloy |
| CN117488046B (en) * | 2023-10-26 | 2024-05-14 | 烟台大学 | Heat treatment device and method for realizing high-hardness wear-resistant 60NiTi alloy |
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