CN106884131A - The technique and continuous hot dip galvanizing steel belt annealing furnace of a kind of steel plate secondary galvanization - Google Patents
The technique and continuous hot dip galvanizing steel belt annealing furnace of a kind of steel plate secondary galvanization Download PDFInfo
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- CN106884131A CN106884131A CN201710026428.7A CN201710026428A CN106884131A CN 106884131 A CN106884131 A CN 106884131A CN 201710026428 A CN201710026428 A CN 201710026428A CN 106884131 A CN106884131 A CN 106884131A
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- 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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- 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
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- 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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- 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
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- 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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- 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
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- 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
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- 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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Abstract
The present invention relates to a kind of technique of steel plate secondary galvanization, including steel plate is through surface clean, annealing, zinc-plated mistake zinc pot, air knife control coating, spraying cooling, finishing, it is characterised 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.Secondary galvanizing is carried out by using the method, in 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.Can realize that coating is the novel corrosion resistant steel sheet product of different ratio twice.
Description
Technical field
The present invention relates to a kind of galvanizing technique, more particularly, to the technique and continuous hot galvanizing steel of a kind of steel plate secondary galvanization
Band annealing furnace.
Background technology
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, once zinc-plated mistake zinc pot, air knife control coating, spraying cooling, finishing
A production process is completed after journey.In production practices, there is client to propose to need the steel plate of super thick coating, by existing production technology
This requirement can not be met, the product produced often has larger open defect.Meanwhile, in normal production and R ＆ D of complex
In, also there are many products for not meeting corresponding delivery requirements to produce, conventional processing method is to degrade treatment until scrapping, and drop
Level or the galvanized sheet value scrapped are relatively low, can bring larger loss to company.
In addition, strip speed is fast in existing continuous hot dip galvanizing steel belt annealing furnace, the features such as control is difficult, it is difficult to suitable
The pre-heating technique of continuous annealing process or secondary galvanization is answered, is difficult to ensure that the strip from stove middle outlet meets continuous hot dip galvanizing zinc pot
The technological requirement of entrance.Because zincincation to raw material plate after cleaning, annealing is needed, then just immersion zinc pot enters
Row galvanizing, this process is directed to the common cold-rolled steel sheet of raw material plate to set, and corresponding production equipment is also special
Door meets corresponding manufacturing technique requirent and customizes, when raw material plate is common galvanized sheet, because surface of steel plate has one layer
Metallic zinc or kirsite, usual fusing point are annealed at 450-600 DEG C or so in continuous annealing process or secondary galvanization production process
The technological temperature of section is generally more than 700 DEG C, zinc-plated plate surface zinc layers can be caused to melt, while can also aoxidize at high temperature；Melt
The metallic zinc of change can be sticked on live-roller, cause surface of steel plate scuffing and the damage of live-roller.In addition, steel plate is secondary being heated
To more than recrystallization temperature, double annealing can also cause that the tensile strength of steel plate does not reach standard requirement so that after secondary galvanization
Product not only surface quality has critical defect and low intensity, plate shape is poor.
The content of the invention
Present invention is primarily intended to provide a kind of technique of steel plate secondary galvanization, it 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 furnace, it makes zinc-plated plate surface zinc layers not
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 what is be addressed by following technical proposals：A kind of steel plate two of the present invention
Secondary zinc-plated technique, including steel plate is through surface clean, annealing, zinc-plated mistake zinc pot, air knife control coating, spraying cooling, finishing, its
It is characterised by, 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℃。
Secondary galvanizing is carried out by using the method, in 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.Can realize that coating is different ratio twice
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.Set according to secondary galvanization product needed, make steel plate in outlet
It is brought rapidly up before section immersion zinc pot to 370-430 DEG C, after galvanized sheet immersion zinc pot, former zinc layers can melt in right amount（With enter pot temperature
It is relevant）, new zinc layers can be plated and are attached on former coating, as an entirety.
Preferably, using nitrogen protection in whole warm body of heater, the control of Oxygen in Nitrogen content exists<10ppm.In nitrogen
Under gas shielded, galvanized sheet smoothly completes pre-heating temperature elevation and not oxidized in stove.
Preferably, nitrogen gushes out protection steel plate up to steel plate immersion zinc pot from body of heater exit.Nitrogen is also from exit
Steel plate is protected in continuation of gushing out until immersion zinc pot.
A kind of continuous hot dip galvanizing steel belt annealing furnace of the present invention, it is characterised in that including：
Body of heater, the heat-insulation layer with full ceramic fibre, furnace chamber has been sequentially distributed bringing-up section, soaking zone and equilibrium from entrance to outlet
Stove section；
Some live-rollers, live-roller outer surface has the adherent layer for preventing viscous zinc of ceramic making；
It is evenly distributed on the radiant tube in the bringing-up section and the soaking zone；
And located at the electromagnetic induction heater of equalizing furnace section.
In this programme, annealing heating section is heated by radiant tube, makes the reduction of control temperature, temperature rise evenly, is solved
The thawing of kirsite and the double annealing problem of steel plate, will not be annealed again；Control temperature reduction, improves corrosion resistance
Can, and metallic zinc and kirsite is not melted, viscous zinc phenomenon is not likely to produce, while live-roller outer surface has ceramic making
The adherent layer of viscous zinc is prevented, so as to avoid live-roller surface tear and the live-roller damage problem that molten zinc adhesion is caused.Moving back
Stove outlet section sets electromagnetic induction heater, steel plate is brought rapidly up before outlet section immersion zinc pot.Enter in whole annealing section
Row nitrogen charging gas shielded；Under nitrogen protection, galvanized sheet smoothly completes pre-heating temperature elevation and not oxidized in stove.
Preferably, the live-roller outside sets and scrapes roller knife.Solve the surface quality problems that annealing section causes.
Preferably, the passage that the electromagnetic induction heater middle part passes through with steel plate.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 body of heater outlet inner side of equalizing furnace section sets three-roller type hot expanding roller.Be easy to control banding steel plate in stove
The speed of service, improve the uniformity that steel plate each portion is heated, and steel plate is more stably entered zinc pot.
Preferably, the body of heater outside of bringing-up section sets steel plate inlet seal room, the external stove nose of body of heater of equalizing furnace section, stove
The nose port of export sets the sinking roller that steel plate is imported zinc pot；The inner chamber inflated with nitrogen of body of heater, stove nose has as steel plate and nitrogen
The passage of outlet.Nitrogen can gush out continuation protection steel plate up to immersion zinc pot from exit, improve protecting effect.
Therefore, a kind of technique of steel plate secondary galvanization of the invention has the advantages that.
1st, the annealing section technological temperature in traditional handicraft is reduced to 300 DEG C by the present invention from 700 DEG C, solves kirsite
Thawing and the double annealing problem of steel plate, the temperature will not be annealed again below the recrystallization temperature of steel plate, make secondary plating
Zinc is more easily implemented.
2nd, in scheme provided by the present invention, the crystalline solid in surface of steel plate kirsite is conducive to subtract with continued growth
The quantity of few lattice, has a certain upgrade to decay resistance.
When the 3rd, heating, because metallic zinc and kirsite will not melt, viscous zinc phenomenon is effectively prevented
4th, nitrogen charging gas shielded is carried out in whole annealing section, without carrying out reduction protection using hydrogen according to usual manner, it is to avoid right
Original zinc coat is adversely affected；Under nitrogen protection, galvanized sheet smoothly completes pre-heating temperature elevation and not oxidized in stove.
5th, electromagnetic induction heater is set up in annealing furnace outlet section, steel plate is brought rapidly up before outlet section immersion zinc pot
To 370-430 DEG C, meanwhile, nitrogen also gushes out continuation protection steel plate up to immersion zinc pot from exit, and protecting effect gets a promotion.
A kind of continuous hot dip galvanizing steel belt annealing furnace of the present invention has the advantages that.
1st, heated using radiant tube, in change routine techniques by the way of open firing burner, make the reduction of control temperature,
Temperature will not be annealed again below the recrystallization temperature of steel plate, solve the thawing of kirsite and the double annealing of steel plate
Problem.
2nd, being heated by radiant tube makes the reduction of control temperature, also improves decay resistance, and make metallic zinc and kirsite
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, so that
Avoid live-roller surface tear that the adhesion of molten zinc causes and live-roller damages problem, and set and scrape roller knife and solve what annealing section caused
Surface quality problems.
3rd, electromagnetic induction heater is set in annealing furnace outlet section, steel plate is brought rapidly up before outlet section immersion zinc pot.
4th, nitrogen charging gas shielded is carried out in whole annealing section, without carrying out reduction protection using hydrogen according to usual manner, is kept away
Exempt to adversely affect original zinc coat；And nitrogen also gushes out continuation protection steel plate up to immersion zinc pot from exit, makes
Good protection is obtained before steel plate immersion zinc pot.
Brief description of the drawings
Accompanying drawing 1 is a kind of principle schematic of continuous hot dip galvanizing steel belt annealing furnace of the present invention.
Specific embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment 1：A kind of technique of steel plate secondary galvanization of the present invention, it includes steel plate through surface clean, excessively annealing, zinc pot
Zinc-plated, air knife control 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 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 whole warm body of heater
Gas shielded, Oxygen in Nitrogen content control exists<10ppm.
Conventional zinc-plated production technology why not can secondary galvanization the reason for：Because zincincation is carried out clearly to raw material plate
After washing, annealing is needed, then just immersion zinc pot carries out galvanizing, this process is directed to raw material plate for common cold-rolled steel
Come what is set, corresponding production equipment is also to be customized exclusively for corresponding manufacturing technique requirent is met to plate, and works as raw material plate
During for common galvanized sheet, because surface of steel plate has layer of metal zinc or kirsite, usual fusing point is and general at 450-600 DEG C or so
The technological temperature of annealing section is generally more than 700 DEG C in logical production process, zinc-plated plate surface zinc layers can be caused to melt, while in height
Can also be aoxidized under temperature.The metallic zinc of thawing can be also sticked on live-roller, cause surface of steel plate scuffing and the damage of live-roller.Separately
Outward, steel plate is secondary is heated to more than recrystallization temperature, and double annealing can also cause that the tensile strength of steel plate does not reach standard and wants
Ask so that not only surface quality has critical defect and low intensity to the product after secondary galvanization, and plate shape is poor.Because as above reason, institute
Secondary galvanization is carried out all without consideration in being produced with conventional art, but is scrapped and is got over.
For the technique bottleneck of above-mentioned restriction secondary galvanization, by equipment improvement and the research and development of new technology of preparing, solution
The problem of 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 once zinc-plated annealing section
Skill, other are identical with conventional galvanizing technique.Above-mentioned process is heated to 250 DEG C ± 20 including steel plate entrance radiant tube
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（Set according to secondary galvanization product needed）, dew point control is at≤- 40 DEG C；Entirely
Warm is protected using nitrogen, and nitrogen consumption is about 500-800/h, and the control of Oxygen in Nitrogen content exists<10ppm.Strip
The process speed of production about 80-120m/min, adjusts according to belt steel thickness.
This process combines conventional hot dip galvanizing process, is used in Continuous Hot Dip Galvanizing Line, can be to plated
The steel band of zinc carries out secondary galvanization, the steel band of surface defect or production super thick coating when can eliminate once 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, secondary galvanizing is carried out by using the method, in Several Thiourea Derivatives on Zinc Plate Surface one layer of hot dip again
Kirsite, twice zinc coat be tightly combined, realize the smooth surface requirements of super thick coating；Can realize that coating is twice
The novel corrosion resistant steel sheet product of different ratio.Secondary galvanization can be passed through to the product that degrade originally or scrap, produced
Satisfactory product, turns waste into wealth.
Process provided by the present invention has the following advantages that：1st, annealing section by the technological temperature in conventional art from
700 DEG C are reduced to 300 DEG C, and the setting of this temperature solves the problems, such as the thawing of kirsite and the double annealing of steel plate, and temperature exists
Below the recrystallization temperature of steel plate, will not be annealed again, while this reheating temperature is conducive to surface of steel plate kirsite
In crystalline solid can with continued growth, reduce lattice quantity, decay resistance is had a certain upgrade；Due to metallic zinc and zinc
Alloy will not melt, and the surface tear and live-roller that adhesion live-roller is caused damage problem and be also readily solved.In addition, to prevent meaning
The loss that outer viscous zinc causes, changes conventional roller for ceramic surface roller, sets up and scrapes roller knife, thoroughly solves the surface quality that annealing section causes
Problem.2nd, because 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 because outlet reduction combustion of hydrogen temperature is higher and it is more difficult to control, original zinc coat can be caused
Adverse effect, new technology is used instead carries out nitrogen charging gas shielded in whole annealing section；Under nitrogen protection, galvanized sheet is smoothly complete in stove
Into pre-heating temperature elevation and not oxidized.3rd, the plate temperature due to 300 DEG C be not well positioned to meet hot-dip steel plate enter pot temperature will
Ask, so set up electromagnetic induction heater in annealing furnace outlet section, make steel plate be brought rapidly up before outlet section immersion zinc pot to
370-430℃（Set according to secondary galvanization product needed）, meanwhile, nitrogen also gushes out continuation protection steel plate up to leaching from exit
Enter zinc pot.After galvanized sheet immersion zinc pot, former zinc layers can melt in right amount（It is relevant with pot temperature is entered）, new zinc layers can plate and be attached to former plating
On layer, as an entirety, through rationally control 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 Figure 1, it includes：Body of heater 1, body of heater 1
Heat-insulation layer with full ceramic fibre, its furnace chamber has been sequentially distributed bringing-up section 2, soaking zone 3 and equalizing furnace section from entrance to outlet
4；Some live-rollers 6, the outer surface of live-roller 6 has 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 located at the electromagnetic induction heater 8 of equalizing furnace section 4.Outside live-roller 6
Side sets scrapes roller knife 7.The body of heater outlet inner side of equalizing furnace section 4 sets three-roller type hot expanding roller 9.The middle part of electromagnetic induction heater 8 has
The passage that steel plate is passed through.The body of heater outside of bringing-up section 2 sets steel plate inlet seal room 5, the external stove nose of body of heater of equalizing furnace section 4
11, the port of export of stove nose 11 sets the sinking roller 12 that steel plate is imported zinc pot；The inner chamber inflated with nitrogen of body of heater 1, stove nose 11 has to be made
It is steel plate and the passage of nitrogen outlet.
The present invention is improved existing continuous hot dip galvanizing steel belt annealing furnace, for strip speed in annealing furnace
Hurry up, the features such as control is difficult, by transformation, be allowed to be adapted to the pre-heating technique of common continuous annealing process or secondary galvanization, really
Protect the technological requirement that continuous hot dip galvanizing zinc pot entrance is met from the strip of stove middle outlet.For the restriction described in background technology
The technique bottleneck of secondary galvanization, is improved by equipment and is allowed to adapt to new technology of preparing, solves the problem of secondary galvanization, main skill
Art is improved as follows：1st, former annealing section preheating section cancels open firing burner, sets up radiant tube heating, and control temperature drops from 700 DEG C
Low to 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
Below recrystallization temperature, will not be annealed again, while.This reheating temperature is conducive to the knot in surface of steel plate kirsite
Crystal with continued growth, can reduce the quantity of lattice, and decay resistance is had a certain upgrade；Due to metallic zinc and kirsite not
Can melt, the surface tear and live-roller that adhesion live-roller is caused damage problem and be also readily solved.In addition, to prevent unexpected viscous zinc
The loss for causing, changes conventional roller for ceramic surface roller, sets up and scrapes roller knife, thoroughly solves the surface quality problems that annealing section causes.
2nd, because metallic zinc and steel plate can be oxidized under 300 degree celsius temperatures, it is originally and reduced with hydrogen in annealing outlet section
Protection, but because outlet reduction combustion of hydrogen temperature is higher and it is more difficult to control, original zinc coat can be adversely affected, this
Invention is used instead and carries out nitrogen charging gas shielded in whole annealing section；Under nitrogen protection, galvanized sheet smoothly completes pre-heating temperature elevation in stove
And it is not oxidized.3rd, the plate temperature due to 300 DEG C is not well positioned to meet the steel plate of hot-dip and enters the requirement of pot temperature, so moving back
Stove outlet section sets up electromagnetic induction heater, steel plate is brought rapidly up to 370-430 DEG C before outlet section immersion zinc pot（Root
Set according to secondary galvanization product needed）, meanwhile, nitrogen also gushes out continuation protection steel plate up to immersion zinc pot from exit.
In actual product is applied to, there can be following technical characteristics：1. bringing-up section and soaking zone configuration are each 180 sets
W shapes radiant tube heats PWM combustion control systems, the burning fire stablized by the air-fuel ratio in the case where optimal state is fixed on
Flame, regulation radiation combustion inner pipe and the time closed, reach the purpose of controlled output power.2. bringing-up section is merged into soaking zone
One furnace chamber, does not set dividing plate between two sections, heating does not have strict boundary, can conveniently adjust each section of temperature curve with soaking, with
Adapt to different technology conditions demand.3. equalizing furnace section is set before exporting, steel plate core thermal stress is eliminated, it is ensured that steel plate cross-section temperature
Uniformly, electromagnetic induction heating system is added, steel band is rapidly heated using equalizing furnace section before zinc pot is entered, adjust steel band
Enter pot temperature, it is ensured that the quality and plate shape of product.4. live-roller uses ceramic surface roller, and setting is scraped roller knife, prevents surface of steel plate
Scratch and roll surface is damaged.5. EMG double roller system for automatically correcting is set in stove.6. outlet stove nose shape sets three-roller type hot expanding roller,
Strip is set to be shaken small by the impact of air knife and air-cooled air-flow after going out zinc pot, to ensure coating quality.7. body of heater is fine using full ceramics
Dimension insulation construction, energy loss is small, and toggle speed is fast.
Claims (9)
1. a kind of technique of steel plate secondary galvanization, including steel plate through surface clean, annealing, cross zinc pot zinc-plated, air knife control coating,
Spraying cooling, finishing, it is characterised 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.
2. the technique of a kind 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. the technique of a kind of steel plate secondary galvanization according to claim 1 or 2 or 3, it is characterised in that：Whole warm
Using nitrogen protection in body of heater, the control of Oxygen in Nitrogen content exists<10ppm.
4. the technique of a kind of steel plate secondary galvanization according to claim 3, it is characterised in that：Nitrogen gushes from body of heater exit
Go out to protect steel plate until steel plate immersion zinc pot.
5. continuous hot dip galvanizing steel belt annealing furnace as claimed in claim 1 or 2 or 3 or 4, it is characterised in that including：
Body of heater（1）, the heat-insulation layer with full ceramic fibre, furnace chamber from entrance to export be sequentially distributed bringing-up section（2）, soaking zone
（3）With equalizing furnace section（4）；Wherein, soaking zone（3）With equalizing furnace section（4）The body of heater of interconnecting part narrows constitute that steel plate passes through logical
Road；
Some live-rollers（6）, live-roller（6）Outer surface has the adherent layer for preventing viscous zinc of ceramic making；
It is evenly distributed on the bringing-up section（2）With the soaking zone（3）Interior radiant tube；
And located at equalizing furnace section（4）Electromagnetic induction heater（8）.
6. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 5, it is characterised in that：The live-roller（6）Outward
Side sets scrapes roller knife（7）.
7. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 5, it is characterised in that：The electromagnetic induction heating
Device（8）The passage that middle part passes through with steel plate.
8. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 5, it is characterised in that：Equalizing furnace section（4）Stove
Body outlet inner side sets three-roller type hot expanding roller（9）.
9. a kind of continuous hot dip galvanizing steel belt annealing furnace according to claim 5 or 6 or 7 or 8, it is characterised in that：Bringing-up section
（2）Body of heater outside set steel plate inlet seal room（5）, equalizing furnace section（4）The external stove nose of body of heater（11）, stove nose（11）Go out
Mouth end sets the sinking roller that steel plate is imported zinc pot（12）；Body of heater（1）Inner chamber inflated with nitrogen, stove nose（11）With as steel plate and
The passage 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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| 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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|---|---|
| CN106884131B (en) | 2018-12-18 |
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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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