CN111893262A - Heat treatment process of rust-proof and corrosion-proof steel - Google Patents
Heat treatment process of rust-proof and corrosion-proof steel Download PDFInfo
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- CN111893262A CN111893262A CN202010870795.7A CN202010870795A CN111893262A CN 111893262 A CN111893262 A CN 111893262A CN 202010870795 A CN202010870795 A CN 202010870795A CN 111893262 A CN111893262 A CN 111893262A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
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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
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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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
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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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
- C23C8/40—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
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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
- C23C8/60—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 solids, e.g. powders, pastes
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Abstract
The invention discloses a heat treatment process of rust-proof and corrosion-proof steel, which comprises the following steps: s1: selecting proper steel, cleaning the steel, and wiping the steel which is hard by rust spots by using steel wires; the steel with lower hardness should be wiped by cotton cloth; after the surface of the steel is cleaned and tightened, carrying out quenching and tempering treatment on the steel; s2: quenching the steel by a box-type resistance furnace at a proper quenching temperature of 850 ℃ for 20-25 min; the method has simple process, and can ensure that the steel has good structural stability and structural strength by carrying out normal quenching and tempering treatment on the steel; in addition, in the heat treatment process, the steel is subjected to salt bath soft nitriding treatment, vacuum zincification treatment and paint coating treatment, so that the steel has good corrosion prevention and rust prevention effects, the performance of the steel is effectively improved, and the service life of the steel is prolonged.
Description
Technical Field
The invention relates to the technical field of steel heat treatment, in particular to a heat treatment process of rust-proof and corrosion-proof steel.
Background
The heat treatment of steel is a process of putting a steel workpiece in a certain medium to be heated to a proper temperature, keeping the temperature for a certain time, cooling the steel workpiece in different media at different speeds, and controlling the performance of the steel workpiece by changing the microstructure of the surface or the interior of a metal material; the potential of steel can be fully exerted through heat treatment, the service performance of the workpiece is improved, the weight of the workpiece is reduced, materials are saved, the cost is reduced, and the service life of the workpiece can be prolonged.
In the steel heat treatment process in the prior art, when water cooling is needed to be carried out on steel in the processing process, the cooling rate of the steel is slow, so that the performance of the steel is influenced; meanwhile, in the heat treatment process of steel, the processes of corrosion prevention and rust prevention treatment of steel are poor, so that it is necessary to design a heat treatment process of rust-proof and corrosion-prevention steel.
Disclosure of Invention
The invention aims to provide a heat treatment process of rust-proof and corrosion-proof steel, which is simple in process, and can enable the steel to have good structural stability and structural strength by carrying out normal quenching and tempering treatment on the steel; in addition, in the heat treatment process, the steel is subjected to salt bath soft nitriding treatment, vacuum zincification treatment and paint coating treatment, so that the steel has good corrosion prevention and rust prevention effects, the performance of the steel is effectively improved, and the service life of the steel is prolonged.
The purpose of the invention can be realized by the following technical scheme:
a heat treatment process of rust-proof and corrosion-proof steel comprises the following steps:
s1: selecting proper steel, cleaning the steel, and wiping the steel which is hard by rust spots by using steel wires; the steel with lower hardness should be wiped by cotton cloth; after the surface of the steel is cleaned and tightened, carrying out quenching and tempering treatment on the steel;
s2: quenching the steel through a box type resistance furnace, selecting a proper quenching temperature which is 850 ℃ to quench the steel, carrying out quenching heat preservation for 20-25min, cooling the steel after quenching, transferring the steel to an electric heating nitrogen protection tempering furnace for tempering treatment after cooling, wherein the tempering temperature is 740 ℃, the tempering heat preservation is 60-65min, and carrying out cooling treatment again after finishing the tempering heat preservation;
s3: carrying out stress relief annealing treatment on the steel so as to eliminate residual stress generated in the machining process of the steel; during stress relief annealing, after the steel is slowly heated to 550 ℃, annealing and heat preservation are carried out for 2.5 hours, air cooling treatment is carried out after annealing is finished, the annealed steel is slowly cooled by air, the annealed steel is transferred into a salt bath tufftride furnace, treatment is carried out for 2-3 hours at the temperature of 550-600 ℃, so that the steel is subjected to salt bath tufftride, low-temperature tempering is required for reducing the residual stress and the brittleness of the steel, the tempering temperature is 160 ℃, heat preservation is carried out for 1.5 hours, and water cooling is carried out through water cooling equipment after heat preservation is finished;
s4: polishing the steel subjected to salt bath soft nitriding by using polishing equipment, removing a loose layer on the nitride outer layer on the surface of the steel, performing infiltration treatment on the polished steel by using a vacuum heating furnace, taking zinc powder as a raw material, and in a rotating closed container, contacting the heated steel with zinc powder under a vacuum condition, so that a zinc-iron alloy infiltration layer can be formed on the surface layer of a matrix of the steel, and an anti-rust layer is formed on the surface of the steel;
s5: performing anticorrosive coating on the steel obtained by heat treatment, selecting proper anticorrosive coating, and performing brushing treatment on the steel to sequentially form a primer layer, an intermediate paint layer and an outer paint layer on the surface of the steel; in the process of painting the paint layer, after the first painting is finished, a certain time gap is kept, after the first drying, the second painting is carried out, the painting direction of the second painting is perpendicular to the painting direction of the first painting, so that the thickness of the paint film is uniform and consistent, after the primer is painted, steel and the paint surface are dried, and after the drying, the rust-proof and corrosion-resistant steel is prepared.
As a further scheme of the invention: in the step S2, the cooling medium used in the cooling process is oil quenching during the quenching and tempering.
As a further scheme of the invention: in the step S5, the primer layer of the steel is an epoxy zinc-rich primer, the intermediate paint layer of the steel is an epoxy micaceous iron intermediate paint, and the outer paint layer of the steel is an acrylic polyurethane finish paint.
As a further scheme of the invention: the thickness of the primer layer is 50-60 μm; the thickness of the intermediate paint layer is 70-80 μm; the thickness of the outer paint surface layer is 60-70 μm;
as a further scheme of the invention: in the step S3, the water cooling equipment includes a chassis, a feed chute, a sealing cover plate, a material conveying assembly, a smoke exhaust assembly, a striker plate, a drainage assembly, a water injection pipe, a hydraulic station and a frame, the feed chute is arranged on one side of the top end surface of the chassis, the sealing cover plate is fixedly arranged on one side of the end surface of the feed chute through a hinge, the striker plate is fixedly arranged on the bottom of the inner side of the feed chute, the drainage assembly is arranged on one side of the outer portion of the striker plate, the water injection pipe is inserted and installed on the other side of the outer portion of the striker plate, the smoke exhaust assembly is arranged on the other side of the top end surface of the chassis, the hydraulic station is fixedly installed on one side of the bottom end surface of the chassis through a screw, the material;
defeated material subassembly includes pneumatic cylinder, guide holder, hydraulic stem, material platform, material frame and supporting link, pneumatic cylinder fixed mounting is in the inside at hydraulic pressure station, the top terminal surface connection of pneumatic cylinder installs the guide holder, and the guide holder is located the inside of quick-witted case, the hydraulic stem is installed in the inside grafting of pneumatic cylinder, and the one end of hydraulic stem passes the guide holder and connects and install the material platform, the top terminal surface fixed mounting of material platform has two material frames, and has the supporting link through welded fastening between the material frame.
As a further scheme of the invention: and drain holes are formed in the periphery of the end face of the material rack.
As a further scheme of the invention: the drainage component comprises a filter frame, a drain pipe, a motor shell, a driving motor and a spiral blade, wherein the filter frame is fixedly installed at one end of the material baffle plate, the drain pipe is installed on one side of the bottom of the filter frame in an inserting mode, the motor shell is fixedly installed on one side of the outside of the case through bolts, the driving motor is fixedly installed on one side of the inside of the motor shell, the spiral blade is installed on one end of the driving motor in a connecting mode, and the spiral blade is located inside the case.
As a further scheme of the invention: the exhaust assembly comprises an equipment box, an exhaust pump, a drying cylinder, an exhaust pipe and a flow guide cover, wherein the equipment box is fixedly installed at the other side of the top of the case through bolts, the exhaust pump is fixedly installed inside the equipment box, one end of the bottom of the exhaust pump is connected with the flow guide cover, the flow guide cover is located at the top of the inner side of the case, the drying cylinder is installed on the end face of the top of the exhaust pump, and the exhaust pipe is installed on the top of the drying cylinder in an inserted mode.
The invention has the beneficial effects that:
1. the method has simple process, and can ensure that the steel has good structural stability and structural strength by carrying out normal quenching and tempering treatment on the steel; in addition, in the heat treatment process, the steel is subjected to salt bath soft nitriding treatment, vacuum zincification treatment and paint surface brushing treatment, so that the steel has good corrosion prevention and rust prevention effects, the performance of the steel is effectively improved, and the service life of the steel is prolonged;
2. in the processing process, when the steel needs to be water-cooled, water cooling is carried out through water cooling equipment; the feeding and discharging are convenient and fast, and the flowing speed of cold water can be increased, so that the cooling speed of steel is increased; meanwhile, in the water cooling process, the water vapor can be dried and discharged.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of the water cooling apparatus of the present invention;
FIG. 2 is an overall sectional view of the water cooling apparatus of the present invention;
FIG. 3 is a schematic structural diagram of a material conveying assembly of the water cooling apparatus of the present invention;
in the figure: 1. a chassis; 2. a feed chute; 3. sealing the cover plate; 4. a material conveying component; 5. a smoke evacuation assembly; 6. a striker plate; 7. a drainage assembly; 8. a water injection pipe; 9. a hydraulic station; 10. a frame; 41. a hydraulic cylinder; 42. a guide seat; 43. a hydraulic lever; 44. a material table; 45. a material rack; 46. a support link; 51. an equipment box; 52. an exhaust pump; 53. a drying cylinder; 54. an exhaust pipe; 55. a pod; 71. a filter frame; 72. a drain pipe; 73. a motor housing; 74. a drive motor; 75. helical leaves.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1-3, a heat treatment process of rust-proof and corrosion-proof steel comprises the following steps:
s1: selecting proper steel, cleaning the steel, and wiping the steel which is hard by rust spots by using steel wires; the steel with lower hardness should be wiped by cotton cloth; after the surface of the steel is cleaned and tightened, carrying out quenching and tempering treatment on the steel;
s2: quenching the steel through a box type resistance furnace, selecting a proper quenching temperature which is 850 ℃ to quench the steel, carrying out quenching heat preservation for 20-25min, cooling the steel after quenching, transferring the steel to an electric heating nitrogen protection tempering furnace for tempering treatment after cooling, wherein the tempering temperature is 740 ℃, the tempering heat preservation is 60-65min, and carrying out cooling treatment again after finishing the tempering heat preservation;
wherein, during quenching and tempering, the cooling medium selected for cooling treatment is oil quenching; the oil cooling rate has ideal cooling characteristics at the fastest speed at the temperature of 500-350 ℃, so that the supercooled austenite structure of the steel has the fastest cooling rate in the most unstable area, and the maximum depth of a hardening layer can be obtained; the martensite transformation zone has the minimum cooling speed, so that the tissue stress can be reduced to the minimum, and the deformation and cracking tendency is reduced;
s3: carrying out stress relief annealing treatment on the steel so as to eliminate residual stress generated in the machining process of the steel; during stress relief annealing, after the steel is slowly heated to 550 ℃, annealing and heat preservation are carried out for 2.5 hours, air cooling treatment is carried out after annealing is finished, the annealed steel is slowly cooled by air, the annealed steel is transferred into a salt bath tufftride furnace, treatment is carried out for 2-3 hours at the temperature of 550-600 ℃, so that the steel is subjected to salt bath tufftride, low-temperature tempering is required for reducing the residual stress and the brittleness of the steel, the tempering temperature is 160 ℃, heat preservation is carried out for 1.5 hours, and water cooling is carried out through water cooling equipment after heat preservation is finished;
wherein, the water cooling device comprises a case 1, a feed chute 2, a sealing cover plate 3, a material conveying component 4, a smoke exhaust component 5, a material baffle plate 6, a water drainage component 7, a water injection pipe 8, a hydraulic station 9 and a frame 10, the feed chute 2 is arranged on one side of the top end surface of the case 1, the sealing cover plate 3 is fixedly arranged on one side of the end surface of the feed chute 2 through a hinge, the material baffle plate 6 is fixedly arranged on the bottom of the inner side of the feed chute 2, the water drainage component 7 is arranged on one side of the outer part of the material baffle plate 6, the water drainage component 7 comprises a filter frame 71, a water drainage pipe 72, a motor shell 73, a driving motor 74 and a spiral vane 75, the filter frame 71 is fixedly arranged at one end of the material baffle plate 6, the water drainage pipe 72 is inserted and installed on one side of the bottom of the filter frame 71, the motor shell 73 is fixedly arranged on, the spiral blade 75 is positioned inside the case 1, so that the water flow speed can be increased, and the water cooling speed is increased; the water injection pipe 8 is installed on the other side of the outer portion of the material baffle 6 in an inserted mode, the smoke exhaust assembly 5 is arranged on the other side of the top end face of the case 1, the smoke exhaust assembly 5 comprises an equipment box 51, an exhaust pump 52, a drying cylinder 53, an exhaust pipe 54 and a flow guide cover 55, the equipment box 51 is fixedly installed on the other side of the top of the case 1 through bolts, the exhaust pump 52 is fixedly installed inside the equipment box 51, the flow guide cover 55 is installed at one end of the bottom of the exhaust pump 52 in a connected mode, the flow guide cover 55 is located on the top of the inner side of the case 1, the drying cylinder 53 is installed on the top end face of the exhaust pump 52 in a connected mode, the exhaust pipe 54; a hydraulic station 9 is fixedly installed on one side of the end face of the bottom of the case 1 through screws, a material conveying assembly 4 is connected and installed on the top of the hydraulic station 9, the material conveying assembly 4 comprises a hydraulic cylinder 41, a guide seat 42, a hydraulic rod 43, a material table 44, material frames 45 and a support connecting rod 46, the hydraulic cylinder 41 is fixedly installed inside the hydraulic station 9, the guide seat 42 is connected and installed on the end face of the top of the hydraulic cylinder 41, the guide seat 42 is located inside the case 1, the hydraulic rod 43 is installed inside the hydraulic cylinder 41 in an inserted mode, one end of the hydraulic rod 43 penetrates through the guide seat 42 and is connected and installed with the material table 44, the two material frames 45 are fixedly installed on the end face of the top of the material table 44, the support connecting rod 46 is fixedly installed between the material frames 45 through welding, and drain holes are; the periphery of the end surface of the bottom of the case 1 is fixedly provided with a frame 10;
the machine case 1 can be supported through the machine frame 10, external cooling water is conveyed to the inside of the machine case 1 through the water injection pipe 8, steel materials needing water cooling are conveyed to the inside of the machine case 1 through the material conveying assembly 4, the steel materials are placed at the top of the material frame 45, the material frame 45 at the top position can be supported through the support connecting rod 46, a plurality of steel materials can be placed, after the steel materials are placed, the hydraulic cylinder 41 in the hydraulic station 9 works, the hydraulic cylinder 41 enables the hydraulic rod 43 to move inside the hydraulic cylinder 41, the hydraulic rod 43 moves inside the guide seat 42 in the downward moving process, the guide effect is achieved, the hydraulic rod 43 drives the material table 44 and the material frame 45 to move downwards, the material table 44 and the material frame 45 move downwards to the inside of the machine case 1 through the feed chute 2, the sealing cover plate 3 covers the upper portion of the feed chute 2, and the steel materials move downwards to the inside of the machine case 1, the contact of the steel and cold water can evaporate moisture, steam is discharged through the smoke exhaust assembly 5, the exhaust pump 52 in the equipment box 51 works, the steam is conveyed to the drying cylinder 53 through the guide cover 55 to be dried, and then the steam is discharged through the exhaust pipe 54; in the process of cooling steel, the water flow speed inside the case 1 is increased through the drainage assembly 7, the driving motor 74 inside the motor shell 73 works, the driving motor 74 drives the spiral blade 75 to rotate at a high speed, the water flow is increased, the cooling speed of the steel can be increased, the surface layer of the steel can fall off in the cooling process of the steel, partial scraps fall on the material baffle plate 6, the scraps can fall into the filter frame 71 along with the continuous flow of the water flow, the drainage pipe 72 is opened, and waste water and the scraps can be conveniently discharged; after cooling, the sealing cover plate 3 is opened, the hydraulic cylinder 41 pushes the hydraulic rod 43 to move upwards, so that the hydraulic rod 43 pushes the material platform 44 and the material rack 45, and steel is moved out of the interior of the case 1;
s4: polishing the steel subjected to salt bath soft nitriding by using polishing equipment, removing a loose layer on the nitride outer layer on the surface of the steel, performing infiltration treatment on the polished steel by using a vacuum heating furnace, taking zinc powder as a raw material, and in a rotating closed container, contacting the heated steel with zinc powder under a vacuum condition, so that a zinc-iron alloy infiltration layer can be formed on the surface layer of a matrix of the steel, and an anti-rust layer is formed on the surface of the steel;
s5: performing anticorrosive coating on the steel obtained by heat treatment, selecting proper anticorrosive coating, and performing brushing treatment on the steel to sequentially form a primer layer, an intermediate paint layer and an outer paint layer on the surface of the steel; in the process of painting the paint layer, after the first painting is finished, a certain time gap is kept, after the first drying, the second painting is carried out, the painting direction of the second painting is perpendicular to the painting direction of the first painting, so that the thickness of the paint film is uniform and consistent, after the primer is painted, the steel and the paint surface are dried, and after the drying is finished, the rust-proof and corrosion-resistant steel is prepared;
wherein, the primer layer of the steel is epoxy zinc-rich primer, the intermediate paint layer of the steel is epoxy micaceous iron intermediate paint, the outer paint layer of the steel is acrylic polyurethane finish paint, and the thickness of the primer layer is 50-60 mu m; the thickness of the intermediate paint layer is 70-80 μm; the thickness of the outer paint surface layer is 60-70 mu m, and the rust prevention and corrosion prevention effects of the steel can be improved.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. The heat treatment process of the rust-proof and corrosion-proof steel is characterized by comprising the following steps of:
s1: selecting proper steel, cleaning the steel, and wiping the steel which is hard by rust spots by using steel wires; the steel with lower hardness should be wiped by cotton cloth; after the surface of the steel is cleaned and tightened, carrying out quenching and tempering treatment on the steel;
s2: quenching the steel through a box type resistance furnace, selecting a proper quenching temperature which is 850 ℃ to quench the steel, carrying out quenching heat preservation for 20-25min, cooling the steel after quenching, transferring the steel to an electric heating nitrogen protection tempering furnace for tempering treatment after cooling, wherein the tempering temperature is 740 ℃, the tempering heat preservation is 60-65min, and carrying out cooling treatment again after finishing the tempering heat preservation;
s3: carrying out stress relief annealing treatment on the steel so as to eliminate residual stress generated in the machining process of the steel; during stress relief annealing, after the steel is slowly heated to 550 ℃, annealing and heat preservation are carried out for 2.5 hours, air cooling treatment is carried out after annealing is finished, the annealed steel is slowly cooled by air, the annealed steel is transferred into a salt bath tufftride furnace, treatment is carried out for 2-3 hours at the temperature of 550-600 ℃, so that the steel is subjected to salt bath tufftride, low-temperature tempering is required for reducing the residual stress and the brittleness of the steel, the tempering temperature is 160 ℃, heat preservation is carried out for 1.5 hours, and water cooling is carried out through water cooling equipment after heat preservation is finished;
s4: polishing the steel subjected to salt bath soft nitriding by using polishing equipment, removing a loose layer on the nitride outer layer on the surface of the steel, performing infiltration treatment on the polished steel by using a vacuum heating furnace, taking zinc powder as a raw material, and in a rotating closed container, contacting the heated steel with zinc powder under a vacuum condition, so that a zinc-iron alloy infiltration layer can be formed on the surface layer of a matrix of the steel, and an anti-rust layer is formed on the surface of the steel;
s5: performing anticorrosive coating on the steel obtained by heat treatment, selecting proper anticorrosive coating, and performing brushing treatment on the steel to sequentially form a primer layer, an intermediate paint layer and an outer paint layer on the surface of the steel; in the process of painting the paint layer, after the first painting is finished, a certain time gap is kept, after the first drying, the second painting is carried out, the painting direction of the second painting is perpendicular to the painting direction of the first painting, so that the thickness of the paint film is uniform and consistent, after the primer is painted, steel and the paint surface are dried, and after the drying, the rust-proof and corrosion-resistant steel is prepared.
2. The heat treatment process of rust-proof and corrosion-resistant steel as claimed in claim 1, wherein in step S2, the cooling medium used in the cooling treatment is oil quenching during quenching and tempering.
3. The heat treatment process of rust-proof and corrosion-resistant steel as claimed in claim 1, wherein in step S5, the primer layer of the steel is epoxy zinc-rich primer, the intermediate paint layer of the steel is epoxy mica iron intermediate paint, and the outer paint layer of the steel is acrylic polyurethane finish paint.
4. The heat treatment process for rust-inhibitive and corrosion-inhibitive steel according to claim 3, wherein the thickness of said primer layer is 50 to 60 μm; the thickness of the intermediate paint layer is 70-80 μm; the thickness of the outer paint surface layer is 60-70 μm.
5. The heat treatment process of rust-proof and corrosion-resistant steel as claimed in claim 1, wherein in step S3, the water cooling equipment comprises a case (1), a feed chute (2), a sealing cover plate (3), a material conveying component (4), a smoke exhaust component (5), a striker plate (6), a drainage component (7), a water injection pipe (8), a hydraulic station (9) and a frame (10), wherein the feed chute (2) is arranged on one side of the top end surface of the case (1), the sealing cover plate (3) is fixedly arranged on one side of the end surface of the feed chute (2) through a hinge, the striker plate (6) is fixedly arranged at the bottom of the inner side of the feed chute (2), the drainage component (7) is arranged on one side of the outer part of the striker plate (6), the water injection pipe (8) is inserted and mounted on the other side of the outer part of the striker plate (6), the smoke exhaust component (5), a hydraulic station (9) is fixedly arranged on one side of the bottom end face of the case (1) through screws, the top of the hydraulic station (9) is connected with and provided with a material conveying assembly (4), and racks (10) are fixedly arranged on the periphery of the bottom end face of the case (1);
defeated material subassembly (4) include pneumatic cylinder (41), guide holder (42), hydraulic stem (43), material platform (44), material frame (45) and supporting connecting rod (46), pneumatic cylinder (41) fixed mounting is in the inside of hydraulic pressure station (9), guide holder (42) are installed in the connection of the top terminal surface of pneumatic cylinder (41), and guide holder (42) are located the inside of quick-witted case (1), hydraulic stem (43) are installed in the inside grafting of pneumatic cylinder (41), and the one end of hydraulic stem (43) passes guide holder (42) and connects and install material platform (44), the top terminal surface fixed mounting of material platform (44) has two material frames (45), and installs supporting connecting rod (46) through welded fastening between material frame (45).
6. The heat treatment process of the rust-proof and corrosion-resistant steel as claimed in claim 5, wherein the periphery of the end surface of the material frame (45) is provided with drain holes.
7. The heat treatment process of rust-proof and corrosion-resistant steel according to claim 5, wherein the drainage assembly (7) comprises a filter frame (71), a drainage pipe (72), a motor shell (73), a driving motor (74) and a spiral blade (75), the filter frame (71) is fixedly installed at one end of the baffle plate (6), the drainage pipe (72) is installed on one side of the bottom of the filter frame (71) in an inserting mode, the motor shell (73) is fixedly installed on one side of the outer portion of the case (1) through bolts, the driving motor (74) is fixedly installed on one side of the inner portion of the motor shell (73), the spiral blade (75) is installed at one end of the driving motor (74) in a connecting mode, and the spiral blade (75) is located inside the case (1).
8. The heat treatment process of rust-resistant anticorrosive steel of claim 5, characterized in that, the subassembly of discharging fume (5) includes equipment box (51), exhaust pump (52), drying cylinder (53), blast pipe (54) and kuppe (55), equipment box (51) passes through bolt fixed mounting at the top opposite side of quick-witted case (1), the inside fixed mounting of equipment box (51) has exhaust pump (52), kuppe (55) is installed in the connection of the bottom one end of exhaust pump (52), and kuppe (55) is located the inboard top of quick-witted case (1), drying cylinder (53) is installed in the connection of the top terminal surface of exhaust pump (52), and blast pipe (54) is installed in the grafting of the top of drying cylinder (53).
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| CN114472119A (en) * | 2021-12-24 | 2022-05-13 | 南通市国盾门业有限公司 | Bottom surface anticorrosion spraying method for steel door leaf |
| CN118109665A (en) * | 2024-04-30 | 2024-05-31 | 东宇东庵(无锡)科技有限公司 | Steel surface quenching device with staged cooling function and quenching process |
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