CN106884131B - A kind of technique and continuous hot dip galvanizing steel belt annealing furnace of steel plate secondary galvanization - Google Patents
A kind of technique and continuous hot dip galvanizing steel belt annealing furnace of steel plate secondary galvanization Download PDFInfo
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- CN106884131B CN106884131B CN201710026428.7A CN201710026428A CN106884131B CN 106884131 B CN106884131 B CN 106884131B CN 201710026428 A CN201710026428 A CN 201710026428A CN 106884131 B CN106884131 B CN 106884131B
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/60—Continuous furnaces for strip or wire with induction heating
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/22—Removing excess of molten coatings; Controlling or regulating the coating thickness by rubbing, e.g. using knives, e.g. rubbing solids
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
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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
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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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
Abstract
The present invention relates to a kind of technique of steel plate secondary galvanization, including steel plate through surface clean, annealing, cross that zinc pot is zinc-plated, air knife controls coating, spraying cooling, finishing, which is characterized in that the process speed of strip is 60-150m/min；In annealing, steel plate is heated to 250 DEG C ± 20 DEG C by the radiant tube of the bringing-up section of continuous hot dip galvanizing steel belt annealing furnace, and the radiant tube of soaking zone is heated to 300 DEG C ± 20 DEG C, and two sections of dew point controls are at≤- 40 DEG C.By carrying out secondary hot galvanizing using the method, in a Several Thiourea Derivatives on Zinc Plate Surface one layer of kirsite of hot dip again, zinc coat is tightly combined twice, realizes the smooth surface requirements of super thick coating.The novel corrosion resistant steel sheet product that coating twice is different ratio may be implemented.
Description
Technical field
The present invention relates to a kind of galvanizing techniques, more particularly, to the technique and continuous hot galvanizing steel of a kind of steel plate secondary galvanization
Band annealing furnace.
Background technique
Common steel plate processing process mainly has cold rolling, zinc-plated, color coating.Wherein cold rolling, color coating can repeat,
And zincincation there are no the precedent of repetition processing due to the particularity of its production process in industry.Conventional hot-dip galvanizing sheet steel
In production process, steel plate was waited through surface clean, annealing, primary zinc-plated, the air knife control coating of zinc pot, spraying cooling, finishing excessively
A production process is completed after journey.In production practice, client proposes to need the steel plate of super thick coating, by existing production technology
It is not able to satisfy this requirement, the product produced often has biggish open defect.Meanwhile in normal production and R & D of complex
In, also there are many products for not meeting corresponding delivery requirements to generate, and previous processing method is downgrade processing until scrapping, and is dropped
Grade or the galvanized sheet scrapped value are lower, and biggish loss can be brought to company.
In addition, the features such as strip speed is fast in existing continuous hot dip galvanizing steel belt annealing furnace, and control is difficult, it is difficult to suitable
The pre-heating technique for answering continuous annealing process or secondary galvanization is not easy to ensure that the strip from furnace middle outlet meets continuous hot galvanizing zinc pot
The technique requirement of entrance.Since zincincation is after cleaning raw material plate, need to make annealing treatment, then just immerse zinc pot into
Row hot galvanizing, this process are set for raw material plate is common cold-rolled steel sheet, and corresponding production equipment is also special
Door meets corresponding manufacturing technique requirent and customizes, when raw material plate is common galvanized sheet, since surface of steel plate has one layer
Metallic zinc or kirsite, usual fusing point are annealed in continuous annealing process or secondary galvanization production process at 450-600 DEG C or so
The technological temperature of section is generally 700 DEG C or more, will cause zinc-plated plate surface zinc layers and melts, while can also aoxidize at high temperature；Melt
The metallic zinc of change can be adhered on live-roller, cause surface of steel plate scuffing and the damage of live-roller.It is heated in addition, steel plate is secondary
To more than recrystallization temperature, double annealing also can make the tensile strength of steel plate that standard requirements be not achieved, so that after secondary galvanization
Product not only surface quality has critical defect and intensity is low, plate shape is poor.
Summary of the invention
The main purpose of the present invention is to provide a kind of techniques of steel plate secondary galvanization, can be hot again in a Several Thiourea Derivatives on Zinc Plate Surface
One layer of kirsite is plated, zinc coat is tightly combined twice, realizes the smooth surface requirements of super thick coating.
It is a further object to provide a kind of continuous hot dip galvanizing steel belt annealing furnaces, make zinc-plated plate surface zinc layers not
It can melt, be not likely to produce viscous zinc phenomenon and scratch or damage the surface of live-roller.
Above-mentioned technical problem of the invention is mainly to be addressed by following technical proposals: a kind of steel plate two of the present invention
Secondary zinc-plated technique, including steel plate through surface clean, annealing, cross that zinc pot is zinc-plated, air knife controls coating, spraying cooling, finishing,
It is characterized in that, the process speed of strip is 60-150m/min；In annealing, steel plate is added by continuous hot dip galvanizing steel belt annealing furnace
The radiant tube of hot arc is heated to 250 DEG C ± 20 DEG C, and the radiant tube of soaking zone is heated to 300 DEG C ± 20 DEG C, and two sections of dew point controls exist
≤-40℃。
By carrying out secondary hot galvanizing using the method, in a Several Thiourea Derivatives on Zinc Plate Surface one layer of kirsite of hot dip again, twice
Zinc coat is tightly combined, and realizes the smooth surface requirements of super thick coating.It is different ratio that coating twice, which may be implemented,
Novel corrosion resistant steel sheet product.
Preferably, setting electromagnetic induction heater, steel plate electromagnetic induction in continuous hot dip galvanizing steel belt annealing furnace outlet section
370-430 DEG C ± 20 DEG C are heated to, dew point is controlled at≤- 40 DEG C.It needs to set according to secondary galvanization product, is exporting steel plate
Section is brought rapidly up before immersing zinc pot to 370-430 DEG C, after galvanized sheet immerses zinc pot, former zinc layers can melt in right amount (with enter pot temperature
It is related), new zinc layers, which can plate, to be attached on former coating, and an entirety is become.
Preferably, using nitrogen protection in entire warm furnace body, Oxygen in Nitrogen content is controlled in < 10ppm.In nitrogen
Under gas shielded, galvanized sheet smoothly completes pre-heating temperature elevation and not oxidized in furnace.
Preferably, nitrogen gushes out protection steel plate up to steel plate immerses zinc pot from furnace body exit.Nitrogen is also from exit
Gush out and continues to protect steel plate until immersing zinc pot.
A kind of continuous hot dip galvanizing steel belt annealing furnace of the present invention, characterized by comprising:
Furnace body, with full ceramic fibre insulating layer, furnace chamber from entrance to outlet be sequentially distributed bringing-up section, soaking zone and
Equalizing furnace section；
Several live-rollers, live-roller outer surface have the adherent layer for preventing viscous zinc of ceramic making；
The radiant tube being evenly distributed in the bringing-up section and the soaking zone；
And the electromagnetic induction heater set on the equalizing furnace section.
In the present solution, annealing heating section by radiant tube heating, makes to control temperature reduction, temperature rise more evenly, solve
The thawing of kirsite and the double annealing problem of steel plate, will not be annealed again；Controlling temperature reduces, and improves corrosion resistance
Can, and melt metallic zinc and kirsite will not, it is not likely to produce viscous zinc phenomenon, while live-roller outer surface has ceramic making
The adherent layer of viscous zinc is prevented, damages problem so as to avoid live-roller surface scratching caused by the adherency of molten zinc and live-roller.It is moving back
Stove outlet section sets electromagnetic induction heater, is brought rapidly up steel plate before outlet section immerses zinc pot.Entire annealing section into
Row nitrogen charging gas shielded；Under nitrogen protection, galvanized sheet smoothly completes pre-heating temperature elevation and not oxidized in furnace.
Roller knife is scraped preferably, setting on the outside of the live-roller.Solve surface quality problems caused by annealing section.
Preferably, the channel that in the middle part of the electromagnetic induction heater there is steel plate to pass through.Steel band is set to enter zinc pot
Preceding to be rapidly heated using equalizing furnace section, adjustment steel band enters pot temperature, it is ensured that the quality and plate shape of product.
Preferably, the furnace body outlet inside of equalizing furnace section sets three-roller type hot expanding roller.Convenient for controlling band-like steel plate in furnace
The speed of service, improve the heated uniformity in each portion of steel plate, and steel plate is made to enter zinc pot more stablely.
Preferably, setting steel plate inlet seal room, the external furnace nose of the furnace body of equalizing furnace section, furnace on the outside of the furnace body of bringing-up section
Nose outlet end sets the sinking roller that steel plate is imported to zinc pot；The inner cavity inflated with nitrogen of furnace body, furnace nose, which has, is used as steel plate and nitrogen
The channel of outlet.Nitrogen can be gushed out from exit to be continued to protect steel plate up to immersing zinc pot, improves protecting effect.
Therefore, a kind of technique of steel plate secondary galvanization of the present invention has the advantages that.
1, the annealing section technological temperature in traditional handicraft is reduced to 300 DEG C from 700 DEG C by the present invention, solves kirsite
Melt and the double annealing problem of steel plate, the temperature steel plate recrystallization temperature hereinafter, will not be annealed again, make secondary plating
Zinc is more easily implemented.
2, in scheme provided by the present invention, being conducive to the crystalline solid in surface of steel plate kirsite can be subtracted with continued growth
The quantity of few lattice, has a certain upgrade to corrosion resistance.
3, when heating, since metallic zinc and kirsite will not melt, it effectively prevent viscous zinc phenomenon
4, nitrogen charging gas shielded is carried out in entire annealing section, without carrying out reduction protection using hydrogen according to usual manner, kept away
Exempt to adversely affect original zinc coat；Under nitrogen protection, galvanized sheet smoothly completed in furnace pre-heating temperature elevation and not by
Oxidation.
5, electromagnetic induction heater is added in annealing furnace outlet section, is brought rapidly up steel plate before outlet section immerses zinc pot
To 370-430 DEG C, meanwhile, nitrogen, which is also gushed out from exit, continues that steel plate is protected to get a promotion up to immersing zinc pot, protecting effect.
A kind of continuous hot dip galvanizing steel belt annealing furnace of the present invention has the advantages that.
1, it is heated using radiant tube, in change routine techniques by the way of open firing burner, makes to control temperature reduction,
Temperature steel plate recrystallization temperature hereinafter, will not be annealed again, solve the thawing of kirsite and the double annealing of steel plate
Problem.
2, make to control temperature reduction by radiant tube heating, also improve corrosion resistance, and make metallic zinc and kirsite
It will not melt, be not likely to produce viscous zinc phenomenon, while live-roller outer surface has the adherent layer for preventing viscous zinc of ceramic making, thus
Live-roller surface scratching caused by molten zinc adherency and live-roller damage problem are avoided, and is set caused by scraping roller knife solution annealing section
Surface quality problems.
3, electromagnetic induction heater is set in annealing furnace outlet section, is brought rapidly up steel plate before outlet section immerses zinc pot.
4, nitrogen charging gas shielded is carried out in entire annealing section, without carrying out reduction protection using hydrogen according to usual manner, kept away
Exempt to adversely affect original zinc coat；And nitrogen also gush out from exit continue protect steel plate until immersion zinc pot, make
Steel plate obtains good protection before immersing zinc pot.
Detailed description of the invention
Attached drawing 1 is a kind of schematic illustration of continuous hot dip galvanizing steel belt annealing furnace of the present invention.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment 1: a kind of technique of steel plate secondary galvanization of the present invention comprising steel plate is through surface clean, annealing, excessively zinc pot
Zinc-plated, air knife controls coating, spraying cooling, finishing；The process speed of strip is 60-150m/min；In annealing, steel plate is by even
The radiant tube of the bringing-up section of continuous hot galvanizing steel strip annealing furnace is heated to 250 DEG C ± 20 DEG C, and the radiant tube of soaking zone is heated to 300 DEG C
± 20 DEG C, two sections of dew point controls are at≤- 40 DEG C.Electromagnetic induction heater is set in continuous hot dip galvanizing steel belt annealing furnace outlet section,
To 370-430 DEG C ± 20 DEG C, dew point is controlled at≤- 40 DEG C steel plate electromagnetic induction heating.Nitrogen is used in entire warm furnace body
Gas shielded, Oxygen in Nitrogen content are controlled in < 10ppm.
Conventional zinc-plated production technology why not can secondary galvanization the reason of: due to zincincation raw material plate is carried out it is clear
It after washing, needs to make annealing treatment, then just immerses zinc pot and carry out hot galvanizing, it is common cold-rolled steel that this process, which is for raw material plate,
For plate come what is set, corresponding production equipment is also to customize exclusively for corresponding manufacturing technique requirent is met, and work as raw material plate
When for common galvanized sheet, since surface of steel plate has one layer of metallic zinc or kirsite, usual fusing point is and general at 450-600 DEG C or so
The technological temperature of annealing section is generally 700 DEG C or more in logical production process, will cause zinc-plated plate surface zinc layers and melts, while in height
It can also be aoxidized under temperature.Molten metal zinc can be also adhered on live-roller, cause surface of steel plate scuffing and the damage of live-roller.Separately
Outside, steel plate is secondary is heated to recrystallization temperature or more, and double annealing can also the tensile strength of steel plate that standard be not achieved to want
It asks, so that not only surface quality has critical defect to the product after secondary galvanization and intensity is low, plate shape is poor.Because of reason as above, institute
With traditional technology produce in all do not take into account that carry out secondary galvanization, but scrap and get over.
For the technique bottleneck of above-mentioned restriction secondary galvanization, pass through equipment improvement and the research and development of new technology of preparing, solution
The problem for secondary galvanization of having determined.The secondary hot dip galvanizing process method of steel plate of the present invention mainly solves the work of former primary zinc-plated annealing section
Skill is other identical as conventional galvanizing technique.Above-mentioned process includes that steel plate entrance radiant tube is heated to 250 DEG C ± 20
DEG C, dew point is controlled at≤- 40 DEG C；Soaking zone radiant tube is heated to 300 DEG C ± 20 DEG C, and dew point is controlled at≤- 40 DEG C；Outlet section electricity
Magnetic induction is heated to 370-430 DEG C ± 20 DEG C (needing to set according to secondary galvanization product), and dew point is controlled at≤- 40 DEG C；Entirely
Warm uses nitrogen protection, and nitrogen consumption is about 500-800/h, and Oxygen in Nitrogen content is controlled in < 10ppm.Strip
The process speed of production about 80-120m/min, adjusts according to steel strip thickness.
This process combines conventional hot dip galvanizing process, uses in Continuous Hot Dip Galvanizing Line, can be to plated
The steel band of zinc carries out secondary galvanization, and the steel band of surface defect or production super thick coating when can eliminate primary zinc-plated reaches heat
The intensity and plasticity requirements of galvanized steel.Product tensile strength 380MPa, yield strength≤300MPa, elongation at break >=28%.
Relative to traditional production technology, process provided by the present invention has following advantageous feature.A kind of steel plate
The process of secondary galvanization, by carrying out secondary hot galvanizing using the method, in a Several Thiourea Derivatives on Zinc Plate Surface one layer of hot dip again
Kirsite, zinc coat is tightly combined twice, realizes the smooth surface requirements of super thick coating；Coating twice, which may be implemented, is
The novel corrosion resistant steel sheet product of different ratio.It can be produced to the product that degraded or scrap originally by secondary galvanization
Satisfactory product, turns waste into wealth.
Process provided by the present invention have the advantages that 1, annealing section by the technological temperature in traditional technology from
700 DEG C are reduced to 300 DEG C, and the setting of this temperature solves the problems, such as that the thawing of kirsite and the double annealing of steel plate, temperature exist
The recrystallization temperature of steel plate hereinafter, will not be annealed, while this reheating temperature is conducive to surface of steel plate kirsite again
In crystalline solid can reduce the quantity of lattice with continued growth, have a certain upgrade to corrosion resistance；Due to metallic zinc and zinc
Alloy will not melt, and adhere to surface scratching caused by live-roller and live-roller damage problem is also readily solved.In addition, to prevent from anticipating
Loss caused by viscous zinc outside, changing conventional roller is ceramic surface roller, adds and scrapes roller knife, thoroughly solves surface quality caused by annealing section
Problem.2, since metallic zinc and steel plate can be oxidized under 300 degree celsius temperatures, technique originally is in annealing outlet section hydrogen
Gas carries out reduction protection, but since outlet reduction combustion of hydrogen temperature is higher and control is more difficult, can cause to original zinc coat
Adverse effect, new process, which is used instead, carries out nitrogen charging gas shielded in entire annealing section；Under nitrogen protection, galvanized sheet is smoothly complete in furnace
At pre-heating temperature elevation and not oxidized.3, the steel plate that the plate temperature due to 300 DEG C is not well positioned to meet hot-dip enters wanting for pot temperature
Ask, so add electromagnetic induction heater in annealing furnace outlet section, make steel plate be brought rapidly up before outlet section immerses zinc pot to
370-430 DEG C (needing to set according to secondary galvanization product), meanwhile, nitrogen, which is also gushed out from exit, to be continued to protect steel plate up to leaching
Enter zinc pot.After galvanized sheet immerses zinc pot, former zinc layers can melt (related with pot temperature is entered) in right amount, and new zinc layers, which can plate, is attached to former plating
On layer, become an entirety, rationally controlled air knife, spraying cooling, after finishing integer, secondary galvanization technique is just formal to be completed
?.
Embodiment 2: a kind of continuous hot dip galvanizing steel belt annealing furnace of the present invention, as shown in Fig. 1 comprising: furnace body 1, furnace body 1
Insulating layer with full ceramic fibre, furnace chamber have been sequentially distributed bringing-up section 2, soaking zone 3 and equalizing furnace section from entrance to outlet
4；Several live-rollers 6,6 outer surface of live-roller have the adherent layer for preventing viscous zinc of ceramic making；It is evenly distributed on the heating
Radiant tube in section 2 and the soaking zone 3；And the electromagnetic induction heater 8 set on the equalizing furnace section 4.Outside live-roller 6
Side, which is set, scrapes roller knife 7.The furnace body outlet inside of equalizing furnace section 4 sets three-roller type hot expanding roller 9.Have in the middle part of electromagnetic induction heater 8
The channel that steel plate passes through.Steel plate inlet seal room 5, the external furnace nose of the furnace body of equalizing furnace section 4 are set on the outside of the furnace body of bringing-up section 2
11,11 outlet end of furnace nose sets the sinking roller 12 that steel plate is imported to zinc pot；The inner cavity inflated with nitrogen of furnace body 1, furnace nose 11, which has, to be made
For the channel of steel plate and nitrogen outlet.
The present invention improves existing continuous hot dip galvanizing steel belt annealing furnace, for strip speed in annealing furnace
Fastly, the features such as control is difficult is allowed to be adapted to the pre-heating technique of common continuous annealing process or secondary galvanization, really by transformation
Protect the technique requirement for meeting continuous hot galvanizing zinc pot entrance from the strip of furnace middle outlet.For restriction described in background technology
The technique bottleneck of secondary galvanization is allowed to adapt to new technology of preparing, solves the problems, such as secondary galvanization, main skill by equipment improvement
Art is improved as follows: 1, former annealing section preheating section cancels open firing burner, adds radiant tube heating, and control temperature is dropped from 700 DEG C
As low as 300 DEG C, the setting of this temperature solves the problems, such as the thawing of kirsite and the double annealing of steel plate, and temperature is in steel plate
Recrystallization temperature hereinafter, will not be annealed, simultaneously again.This reheating temperature is conducive to the knot in surface of steel plate kirsite
Crystal can be reduced the quantity of lattice, be had a certain upgrade to corrosion resistance with continued growth；Not due to metallic zinc and kirsite
It can melt, adhere to surface scratching caused by live-roller and live-roller damage problem is also readily solved.In addition, to prevent unexpected viscous zinc
Caused loss, changing conventional roller is ceramic surface roller, adds and scrapes roller knife, thoroughly solves surface quality problems caused by annealing section.
2, it since metallic zinc and steel plate can be oxidized under 300 degree celsius temperatures, is originally and is restored in annealing outlet section with hydrogen
Protection, but since outlet reduction combustion of hydrogen temperature is higher and control is more difficult, original zinc coat can be adversely affected, this
Invention, which is used instead, carries out nitrogen charging gas shielded in entire annealing section；Under nitrogen protection, galvanized sheet smoothly completes pre-heating temperature elevation in furnace
And it is not oxidized.3, the steel plate that the plate temperature due to 300 DEG C is not well positioned to meet hot-dip enters the requirement of pot temperature, so moving back
Stove outlet section adds electromagnetic induction heater, is brought rapidly up steel plate to 370-430 DEG C of (root before outlet section immerses zinc pot
Need to set according to secondary galvanization product), meanwhile, nitrogen, which is also gushed out from exit, to be continued to protect steel plate up to immersing zinc pot.
In being applied to actual product, there can be following technical characteristics: 1. bringing-up sections and each 180 sets of soaking zone configuration
W-shaped radiant tube heats PWM combustion control system, by obtaining stable burning fire in the air-fuel ratio being fixed under optimal state
Flame adjusts the time of radiation combustion inner pipe and closing, achievees the purpose that control output power.2. bringing-up section is merged into soaking zone
One furnace chamber does not set partition between two sections, and heating does not have stringent boundary with soaking, can be convenient adjustment temperature of each section curve, with
Adapt to different technology conditions demand.3. setting equalizing furnace section before outlet, steel plate core thermal stress is eliminated, guarantees steel plate cross-section temperature
Uniformly, electromagnetic induction heating system is added, steel band is made to be rapidly heated before entering zinc pot using equalizing furnace section, adjusts steel band
Enter pot temperature, it is ensured that the quality and plate shape of product.4. live-roller uses ceramic surface roller, setting scrapes roller knife, prevents surface of steel plate
It scratches and roll surface damages.5. setting EMG double roller system for automatically correcting in furnace.6. exporting furnace nose shape is arranged three-roller type hot expanding roller,
Impact shake after making strip go out zinc pot by air knife and air-cooled air-flow is small, to guarantee coating quality.7. furnace body is fine using full ceramics
Insulation construction is tieed up, energy loss is small, and starting speed is fast.
Claims (7)
1. a kind of technique of steel plate secondary galvanization, including steel plate through surface clean, annealing, cross zinc-plated zinc pot, air knife control coating,
Spraying cooling, finishing, which is characterized in that the process speed of strip is 60-150m/min；In annealing, steel plate is by continuously dip coat
The radiant tube of the bringing-up section of zinc steel strip annealing furnace is heated to 250 DEG C ± 30 DEG C, and the radiant tube of soaking zone is heated to 300 DEG C ± 30
DEG C, two sections of dew point controls are at≤- 40 DEG C；Use nitrogen protection in entire annealing process furnace body, the control of Oxygen in Nitrogen content <
10ppm；Nitrogen gushes out protection steel plate up to steel plate immerses zinc pot from furnace body exit.
2. a kind of technique of steel plate secondary galvanization according to claim 1, it is characterised in that: moved back in continuous hot dip galvanizing steel belt
Stove outlet section sets electromagnetic induction heater, steel plate electromagnetic induction heating to 350-450 DEG C ± 20 DEG C, dew point control≤-
40℃。
3. continuous hot dip galvanizing steel belt annealing furnace as claimed in claim 1 or 2, characterized by comprising:
Furnace body (1), the insulating layer with full ceramic fibre, furnace chamber have been sequentially distributed bringing-up section (2), soaking zone from entrance to outlet
(3) and equalizing furnace section (4)；Wherein, the narrowed composition steel plate of the furnace body of soaking zone (3) and equalizing furnace section (4) interconnecting part passes through logical
Road；
Several live-rollers (6), live-roller (6) outer surface have the adherent layer for preventing viscous zinc of ceramic making；
The radiant tube being evenly distributed in the bringing-up section (2) and the soaking zone (3)；
And it is set to the electromagnetic induction heater (8) of the equalizing furnace section (4).
4. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 3, it is characterised in that: the live-roller (6) is outside
Side, which is set, scrapes roller knife (7).
5. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 3, it is characterised in that: the electromagnetic induction heating
The channel that in the middle part of device (8) there is steel plate to pass through.
6. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 3, it is characterised in that: the furnace of equalizing furnace section (4)
Body outlet inside sets three-roller type hot expanding roller (9).
7. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 3 or 4 or 5 or 6, it is characterised in that: bringing-up section
(2) steel plate inlet seal room (5), the external furnace nose (11) of the furnace body of equalizing furnace section (4) are set on the outside of furnace body, furnace nose (11) goes out
Mouth end sets the sinking roller (12) that steel plate is imported to zinc pot；The inner cavity inflated with nitrogen of furnace body (1), furnace nose (11) have as steel plate and
The channel of nitrogen outlet.
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| CN201710026428.7A CN106884131B (en) | 2017-01-13 | 2017-01-13 | A kind of technique and continuous hot dip galvanizing steel belt annealing furnace of steel plate secondary galvanization |
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| CN201710026428.7A CN106884131B (en) | 2017-01-13 | 2017-01-13 | A kind of technique and continuous hot dip galvanizing steel belt annealing furnace of steel plate secondary galvanization |
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| CN108607896B (en) * | 2018-04-23 | 2020-10-02 | 黄石山力科技股份有限公司 | Continuous hot-dip unit with leveling function before plating and hot-dip process |
| CN110331354A (en) * | 2019-07-23 | 2019-10-15 | 焦作市海博金属制品有限公司 | A kind of dedicated hot galvanizing steel strip hot-dip processing and forming technology of four sides cable |
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| CN201512572U (en) * | 2009-10-22 | 2010-06-23 | 中国钢研科技集团有限公司 | Dual-purpose furnace for continuous hot galvanizing and continuous annealing of steel strip |
| WO2011072883A1 (en) * | 2009-12-15 | 2011-06-23 | Siemens Vai Metals Technologies Sas | Equipment and method for preheating a continuously moving steel strip |
| JP5071551B2 (en) * | 2010-12-17 | 2012-11-14 | Ｊｆｅスチール株式会社 | Continuous annealing method for steel strip, hot dip galvanizing method |
| CN106119756B (en) * | 2016-08-25 | 2018-11-09 | 江苏京生管业有限公司 | A kind of galvanizing strip production system |
| CN206375985U (en) * | 2017-01-13 | 2017-08-04 | 浙江华达新型材料股份有限公司 | A kind of continuously pre-heating stove of the secondary galvanizing of steel plate |
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Denomination of invention: A Process for Secondary Galvanizing of Steel Plate and Continuous Hot Dip Galvanized Steel Strip Annealing Furnace Effective date of registration: 20230727 Granted publication date: 20181218 Pledgee: Fuyang sub branch of Bank of Hangzhou Co.,Ltd. Pledgor: ZHEJIANG HUADA NEW MATERIAL Co.,Ltd. Registration number: Y2023980050008 |
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