CN106893958B - The method for reducing Continuous Hot Dip Galvanizing booting roll marks - Google Patents

The method for reducing Continuous Hot Dip Galvanizing booting roll marks Download PDF

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Publication number
CN106893958B
CN106893958B CN201510958758.0A CN201510958758A CN106893958B CN 106893958 B CN106893958 B CN 106893958B CN 201510958758 A CN201510958758 A CN 201510958758A CN 106893958 B CN106893958 B CN 106893958B
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booting
roller
temperature
furnace
control
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CN106893958A (en
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何锐
徐方
陈绍林
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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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
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • C23C2/26—After-treatment
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

The present invention relates to a kind of methods of reduction Continuous Hot Dip Galvanizing booting roll marks, it is characterized in that, the environmental protection hopper includes walking mechanism, traction mechanism, hopper component, depositing dust spray system, support component, video monitoring system and electric control system, the hopper component is arranged in support component, the bottom of the hopper component is provided with walking mechanism, the lower section of hopper component is arranged in the electric control system, the top of hopper component is arranged in the video monitoring system, and the depositing dust spray system is arranged on hopper component.The device sets up walking mechanism, steering mechanism, can be in Wharf Platform cross, longitudinal movement, equipment strong flexibility, hopper is suitable for reading to be equipped with automatic spray dust falling system, operation fugitive dust can be effectively suppressed, there is preferable environment protecting, reduce labor intensity, improve work efficiency.

Description

The method for reducing Continuous Hot Dip Galvanizing booting roll marks
Technical field
The present invention relates to a kind of methods of reduction Continuous Hot Dip Galvanizing booting roll marks, belong to Continuous Hot Dip Galvanizing booting Control process technical field.
Background technique
Roll marks defect is a kind of defect common in hot galvanizing production, mainly since foreign matter bonds roll surface, in tension Effect is lower and belt steel surface is made to generate raised impression, this kind of defect user generally will not receive, and can only carry out downgrade processing.
Due to the process characteristic of Continuous Hot Dip Galvanizing, since various parameters are also all unstable in start process, can generate A large amount of rolled tin, zinc granule, cadmia etc., these are easily detached to be bonded to roller surfaces from belt steel surface, the rear row strip made Generate roll marks.Domestic similar unit, the generation of roll marks defect in order to prevent, is mostly to carry out pressure-air to roll surface in start process Purging, the foreign matters such as rolled tin, zinc granule, cadmia are blown off from roll surface.However the effect of compressed air purging and pay no attention in actual production To think, a large amount of roll marks defect is produced in start process and is also occurred often, and those skilled in the art wants to solve the problems, such as this always, But the problem is never well solved.
Summary of the invention
To solve the above problems, the invention discloses a kind of sides of reduction Continuous Hot Dip Galvanizing booting roll marks Method, this method is ingenious in design, and by the setting of multiple steps, which is effectively reduced the production of roll marks in start process It is raw, further ensure product quality.
To achieve the goals above, technical scheme is as follows, a kind of reduction Continuous Hot Dip Galvanizing booting roll marks Method, which is characterized in that the described method comprises the following steps；1) cleaning section, 2) stove section, 3) zinc pot air knife section, 4) it is smooth Tension leveling segment.
As an improvement of the present invention, step 1) the cleaning section concrete operations are as follows: 11) concentration of lye and temperature Control, cleaning section lye are likely to result in the variation of concentration of lye, before booting due to the various uncertain factors during shutting down It tests to concentration of lye, send within two hours after booting a sample again, start process should control concentration of lye 1.8~ Between 2.0%；In start process, after being switched in order to prevent, the absorption of groove body and strip to temperature, appropriate increase lye temperature Degree can be controlled by 90 ± 3 DEG C；In start process concentration of lye and alkali liquid temperature can in this way can guarantee in optimum range It is interior, it ensure that cleaning effect, reduce incoming band steel Superficial Foreign Body, iron scale adheres to each roller in furnace, generates the general of furnace roller roll marks Rate, at the same decrease it is zinc-plated after cause dezincification, rolled tin adheres to the possibility that roll surface generates roll marks.12) washing outlet uses steam Heating, drying, continuous galvanizing line cleaning after mostly use waste gas residual heat heat air, booting initial stage due to waste gas residual heat temperature it is lower, Also the strip made is ineffective into drying before stove, and belt steel surface band water enters stove, can generate in this way in belt steel surface a large amount of Iron scale, so that the generation probability of furnace rolls print greatly improves.
Therefore in start process, it should which the mode for converting washing outlet heating hot-air is turned by original waste gas residual heat heating Become hot steam heating, in order to guarantee its drying effect, make its Jia Rewendu≤100 DEG C, is cut again after waiting unit stable Gain waste gas residual heat heating method.
As an improvement of the present invention, stove section control concrete operations are as follows in the step step 2): 21) stove temperature Degree control, continuous galvanizing line, RHS (soaking zone) is due to not waiting Divisions, so during heating, it may appear that each area's temperature Rise nonsynchronous phenomenon, in order to guarantee that its heating is relatively more synchronous, need to intervene manually in temperature-rise period, the area Shi Qige uniformly rises Temperature.
When RHS (soaking zone) furnace temperature reaches 720~750 DEG C, rolled tin yield is smaller after booting, when being higher than 750 DEG C, Strip is also easy to produce hot wooden dipper song defect, and when temperature is lower than 720 DEG C, rolled tin is more after booting, so, before booting operation, need to guarantee Each area's temperature of soaking zone is between 720~750 DEG C；After unit 30m/min creeps, DFS (direct combustion section) main burner is opened immediately, with The loss of soaking zone heat is supplemented, to prevent the quick reduction of soaking section temperature, to cause dezincification, generates roll marks；22) stablize Furnace temperature, furnace pressure, furnace temperature, furnace pressure belong to closed-loop control, its fluctuation is too big in order to prevent, and the booting initial stage unit speed of service should not be too Fastly, raising speed should be controlled in 5m/min.When discovery furnace temperature fluctuation become larger, should stop continue raising speed, remain operational a period of time, until Until furnace temperature furnace pressure is stablized, the necessary moment carries out the intervention of coal gas, air and furnace pressure manually.It is avoided in this way due to furnace temperature furnace Pressure fluctuation it is larger caused by furnace atmosphere disorder, cause strip internal stress change and caused by shape wave problem.
Stable furnace temperature, furnace pressure are the premises of zinc-plated preceding plate form control, and good plate shape can reduce air knife and go out to fly zinc, scrape zinc The generation of defect, can effectively reduce the generation of zinc granule, to reduce the generation of roll marks defect after plating.
23) furnace atmosphere is controlled,
A. the air-tightness of fire door directly determines the height of oxygen content in furnace, when fire door is not shut, causes outside air Into, then oxygen content can be caused to be difficult to the problem of declining, so that strip is aoxidized in annealing furnace inner surface, formation dezincification or dew Iron causes roll marks defect indirectly, so having to confirm that good each fire door is shut before booting；
B. nitrogen purging burner hearth has to sufficiently, to light a fire when each area's oxygen content is reduced to 100ppm or less；
C. it during pipeline release, need to be detected at discharging opening sampling valve using the blowing method of coal gas after first nitrogen (carbon monoxide detector detection can be used) when to coal gas, can determine whether that release is completed.
D. booting initial stage can suitably increase the reducing atmosphere in soaking zone furnace, appropriate to increase hydrogen in nitrogen hydrogen protective gas Content, control 30%~35%.
As an improvement of the present invention, step 3) the zinc pot air knife section concrete operations are as follows:
31) the aluminium content control of zinc liquid before being switched on,
Aluminium content can be because the various factors consumption such as steel grade be different, and usually per tour sample presentation carries out aluminium content in zinc liquid Detection.Need detect aluminium content to zinc liquid sample presentation before booting within 4 hours in advance, when sampling should sample below zinc liquid 300mm, when aluminium contains It when measuring lower, should be replenished in time, aluminium content should control between 0.20%~0.25%, can effectively reduce the production of cadmia in this way It is raw, indirectly control the generation of roll marks.
32) control of zinc liquid temperature, booting start to heat up to zinc liquid for first 1 hour, and heating rate is less than 10 DEG C/min, heating The suspension that will cause very much bottom ash fastly ensures zinc liquid temperature at 463 ± 3 DEG C before booting；
33) prune job of slag is carried out,
A. face slag is easy to adherency belt steel surface, is switched on first 30 minutes, and opposite slag is answered to carry out primary thoroughly cleaning, to prevent Strip is only adhered to, surface generates roll marks.After unit 30m/min brings into operation, sinking roller, stabilizing roller 3-3 should put into scraper into The clear roller of row need to manually carry out clear roller operation for correct roller 3-4；
B. the mode that the table slag on zinc liquid surface generallys use artificial fishing slag is removed, during fishing slag inevitably to zinc liquid into Row agitation, this will cause bottom ash to float with the flowing of zinc liquid, adhere to belt steel surface, directly affect product quality.Therefore necessary Standard operation prevents " violence fishing slag ", it is ensured that careful operation during fishing slag.Zinc liquid normal circulation in zinc pot is not influenced, is prevented Only agitation zinc liquid band moves the floating of cadmia, causes cadmia defect.
34) adjustment of air knife,
Since booting flitch shape is not generally very well that edge dam not put at this time, air knife distance is set in 50~ 80mm, pressure are set in 300~500bar height and are set in 350mm, will not both generate thicker zinc layers in this way, will not cause The splashing of zinc liquid.The generation that zinc zinc granule can be effectively reduced in this way, indirectly controls the generation of roll marks.
35) the clear roller operation of roller system is carried out,
A. after being switched on, blower fan of cooling tower after plating should be opened in time, the temperature after making strip to tower top should not be too high, should control Between 190~230 DEG C, to prevent hot sticky attached effect, cadmia adheres to roll surface；Top roller scraper should be put into time, prevent roll surface viscous Zinc.Scraper is all put into after the belt steel surfaces such as other each rollers are normal.Clean roll surface.
B. it not put at once after squeeze roller booting after watch-quench tank, make belt steel surface band water running, levelling withdrowal straightening section is extracted Roller also not put into, and shower water is all opened, and made to form moisture film between strip and roller, be found in practice, when belt steel surface has water, Zinc granule, cadmia should not adhere to roll surface, and when purging operation, rolled tin is easily blown away, and is not flown disorderly.Substantially increase the effect of purging operation Rate.Squeeze roller is put into again after waiting unit speed to reach 90M/min after watch-quench tank.
As an improvement of the present invention, step 4) the levelling withdrowal straightening section concrete operations are as follows: 41) work roll for temper mill Investment in due course, before booting, it is ensured that each roller of smooth 4-1 straightening 4-4 is in off-line state, after waiting belt steel surface is without rolled tin cadmia, It can put into, and open high pressure water 4-2 in time and roll surface is continuously cleared up, to prevent the generation of roll marks defect；42) roll surface band water Purging after strip 30m/min creeps, opens smooth each spray tube 4-5 of 4-1 tension leveling segment 4-2, rear each roller scraper 4-3 smooth at this time It not put into, after waiting belt steel surface zinc layers to stablize, the purging operation of compressed air is carried out with water, after the completion of purging, investment is each Roller scraper carries out clear roller operation to roll surface.It was verified that it is obvious with water purging purging effect, it is high-efficient, and rolled tin does not fly disorderly.
Compared with the existing technology, advantages of the present invention is as follows, 1) entire Technical Design is ingenious, skilful by each step Wonderful control greatly reduces the generation of roll marks in start process, and each step of the technical solution is applicant through excessive The experiment of amount is constantly summarized and is obtained, and further ensures product quality, reduces enterprise's production cost.
Detailed description of the invention
Fig. 1 cleaning section schematic diagram；
Fig. 2 stove section schematic diagram；
Fig. 3 zinc pot section schematic diagram；
Fig. 4 levelling withdrowal straightening section schematic diagram；
Fig. 5 booting control schematic diagram；
In figure: 1-1 lye, 1-2 groove body, 1-3 strip, 1-4 exhaust gas, 1-5 hot steam, 1-6 air, 2-1 soaking zone RHS, 2-2 direct combustion section DFS, 3-1 zinc liquid, 3-2 sinking roller, 3-3 stabilizing roller, 3-4 correct roller, 3-5 air knife, 3-6 blower, 3-7 watch-quench tank, 3-8 squeeze roller, 4-1 is smooth, 4-2 high pressure water, 4-3 scraper, 4-4 straightening, 4-5 spray tube.
Specific embodiment
In order to further enhance the appreciation and understanding of the invention, with reference to the accompanying drawings and detailed description, this is furtherd elucidate Invention.
Embodiment 1:
Preparation before booting: first 2 hours of booting, entrance personnel carry out sample presentation to cleaning section lye 1-1 concentration, guarantee Between 1.8~2.0%, alkali liquid temperature is controlled at 90 ± 3 DEG C entrance concentration of lye, can guarantee strip in start process in this way Cleaning effect of the surface in cleaning section.In order to make in start process, washing outlet section reaches preferable drying effect, switching The mode for heating air 1-6 is switched to hot steam 1-5 heating method by exhaust gas 1-4 waste-heat mode, which can be with Guarantee that drying air themperature is stablized at 100 DEG C, avoids the bad drawback of the low heating effect of waste heat initial stage temperature.Burner hearth is carried out Nitrogen purges operation, and each area's oxygen content will be reduced to 100ppm or less and can just light a fire.When oxygen content is difficult to down in purge When drop, the airtightness at the positions such as fire door need to be checked.It, need to be using the purging side of coal gas after first nitrogen during pipeline release Method (is detected) when detecting coal gas at discharging opening sampling valve using carbon monoxide detector, can determine whether that release is completed.It needs to mention before booting Aluminium content (should sample below zinc liquid 300mm when sampling) was detected to zinc liquid 3-1 sample presentation in first 4 hours.When aluminium content is lower, answer It is replenished in time.Ensure that zinc liquid aluminium content should control between 0.20%~0.25%.First 30 minutes of booting, opposite slag carry out primary Thoroughly cleaning.Booting starts to heat up to zinc liquid 3-1 for first 1 hour, and heating rate will cause very much bottom less than 10 DEG C/min, heating fastly The suspension of slag ensures zinc liquid temperature at 463 ± 3 DEG C before booting.
Before booting, it is ensured that each roller of levelling withdrowal straightening can just be thrown after waiting belt steel surface is without rolled tin cadmia in off-line state Enter.And it opens high pressure water in time and roll surface is continuously cleared up.To prevent the generation of roll marks defect.
In start process: after unit 30m/min creeps, opening direct combustion section 2-2 burner, immediately to supplement soaking zone heat Loss, to prevent the quick reduction of soaking zone temperature 2-1 degree, so that dezincification is caused, when furnace temperature reaches 720~750 DEG C, after booting Rolled tin yield is smaller, and when being higher than 750 DEG C, strip is also easy to produce hot wooden dipper song defect, when temperature is lower than 720 DEG C, rolled tin after booting It is more.So needing to guarantee each area's temperature of soaking zone between 720~750 DEG C before booting operation.(being shown in Table 1)
The booting initial stage unit speed of service should not be too fast, and speedup should be controlled in 5m/min.When discovery furnace temperature fluctuation become larger, answer Stop continuing raising speed, remain operational a period of time, until furnace temperature furnace pressure is stablized, the necessary moment carries out coal gas, air manually With the intervention of furnace pressure.Avoid in this way as furnace temperature furnace pressure fluctuate it is larger caused by furnace atmosphere disorder, cause inside strip Stress change and caused by shape wave problem.Booting initial stage can suitably increase the reducing atmosphere in soaking zone furnace, appropriate to increase Add the content of hydrogen in nitrogen hydrogen protective gas, controls 30%~35%.Air knife 3-5 distance is set in 50~80mm or so, pressure Power is set in 300~500bar height and is set in 350mm, will not both generate thicker zinc layers in this way, will not cause zinc liquid It splashes, sinking roller 3-2, stabilizing roller 3-3, which should put into scraper, which carries out clear roller, need to manually carry out clear roller operation for correct roller 3-4.
After booting, blower fan of cooling tower 3-6 after plating should be opened in time, and the temperature after making strip to tower top should not be too high, control Between 190~230 DEG C, to prevent hot sticky attached effect, cadmia adheres to roll surface.Top roller scraper should be put into time, prevent roll surface viscous Zinc.Scraper is all put into after the belt steel surfaces such as other each rollers are normal.Clean roll surface.After watch-quench tank 3-7 after squeeze roller 3-8 booting not It to put at once, make belt steel surface band water running, levelling withdrowal straightening section squeeze roller also not put into, and shower water is all opened, and strip is made Moisture film is formed between roller, is found in practice, and when belt steel surface has water, zinc granule, cadmia should not adhere to roll surface, and purge operation When, rolled tin is easily blown away, and is not flown disorderly.Squeeze roller 3-8 is put into again after waiting unit speed to reach 90M/min after watch-quench tank 3-7.
After strip 30m/min creeps, each spray tube 4-5 of 4-4 sections of smooth 4-1 straightening is opened, each roller is scraped after smooth 4-1 at this time Knife 4-3 not put into, and after waiting belt steel surface zinc layers to stablize, the purging operation of compressed air is carried out with water, in practice it has proved that, band water It is obvious to purge purging effect, it is high-efficient, and rolled tin does not fly disorderly.After the completion of purging, the clear roller of scraper 4-3 is put into, puts into levelling withdrowal straightening Each roller, and open high pressure water 4-2.
It should be noted that above-described embodiment is only presently preferred embodiments of the present invention, there is no be used to limit the present invention Protection scope, the equivalent substitution or substitution made based on the above technical solution belongs to protection model of the invention It encloses.

Claims (4)

1. a kind of method for reducing Continuous Hot Dip Galvanizing booting roll marks, which is characterized in that the described method comprises the following steps；1) Cleaning section, 2) stove section, 3) zinc pot air knife section, 4) levelling withdrowal straightening section；
Step 1) the cleaning section concrete operations are as follows: 11) control of concentration of lye and temperature, cleaning section lye is due to down period Between various uncertain factors, be likely to result in the variation of concentration of lye, test before booting to concentration of lye, after booting A sample is sent within two hours again, and start process should control concentration of lye between 1.8~2.0%；In start process, in order to anti- After being only switched on, groove body and strip can control the absorption of temperature, suitably increase alkali liquid temperature by 90 ± 3 DEG C；12) it cleans Outlet uses steam heating, drying, and hot steam heating in order to guarantee its drying effect, makes its Jia Rewendu≤100 DEG C, waits standby Waste gas residual heat heating method is switched back into again after group is stable；
2) the stove section concrete operations are as follows: 21) furnace controls, and 22) stablize furnace temperature, furnace pressure, furnace temperature, furnace pressure, which belong to, to be closed Ring control, 23) control furnace atmosphere；
3) the zinc pot air knife section concrete operations are as follows: 31) the aluminium content control of zinc liquid before being switched on, the 32) control of zinc liquid temperature, 33) the clear roller operation of roller system carry out the prune job of slag, the 34) adjustment of air knife, 35) is carried out,
4) the levelling withdrowal straightening section concrete operations are as follows: 41) the in due course investment of work roll for temper mill, and 42) roll surface band water purging.
2. the method according to claim 1 for reducing Continuous Hot Dip Galvanizing booting roll marks, which is characterized in that the step 2) stove section control concrete operations are as follows in: 21) furnace controls, when RHS (soaking zone) furnace temperature reaches 720~750 DEG C, Rolled tin yield is smaller after booting, and when being higher than 750 DEG C, strip is also easy to produce hot wooden dipper song defect, when temperature is lower than 720 DEG C, booting Rolled tin is more afterwards, so, before booting operation, need to guarantee each area's temperature of soaking zone between 720~750 DEG C；Unit 30m/min After creeping, DFS (direct combustion section) main burner is opened immediately, to supplement the loss of soaking zone heat, to prevent the fast of soaking section temperature Speed reduces, to cause dezincification, generates roll marks；22) stablize furnace temperature, furnace pressure, furnace temperature, furnace pressure belong to closed-loop control, in order to prevent Its fluctuation is too big, and the booting initial stage unit speed of service should not be too fast, and raising speed should be controlled in 5m/min；
23) furnace atmosphere is controlled,
A. it has to confirm that good each fire door is shut before being switched on；
B. nitrogen purging burner hearth has to sufficiently, to light a fire when each area's oxygen content is reduced to 100ppm or less；
C. during pipeline release, coal need to be detected at discharging opening sampling valve using the blowing method of coal gas after first nitrogen When gas, it can determine whether that release is completed；
D. booting initial stage can suitably increase the reducing atmosphere in soaking zone furnace, and hydrogen contains in appropriate increase nitrogen hydrogen protective gas Amount is controlled 30%~35%.
3. the method according to claim 2 for reducing Continuous Hot Dip Galvanizing booting roll marks, which is characterized in that the step Rapid 3) zinc pot air knife section concrete operations are as follows:
31) the aluminium content control of zinc liquid before being switched on needs 4 hours in advance to detect aluminium content to zinc liquid sample presentation before booting, when sampling answers Sample below zinc liquid 300mm, when aluminium content is lower, should be replenished in time, aluminium content should control 0.20%~0.25% it Between,
32) control of zinc liquid temperature, booting start to heat up to zinc liquid for first 1 hour, and heating rate heats up too fast less than 10 DEG C/min It will cause the suspension of bottom ash, ensure zinc liquid temperature at 463 ± 3 DEG C before booting；
33) prune job of slag is carried out,
A. face slag is easy to adherency belt steel surface, is switched on first 30 minutes, answers opposite slag to carry out primary thoroughly cleaning, works as unit After 30m/min brings into operation, sinking roller, stabilizing roller, which should put into scraper, which carries out clear roller, need to manually carry out clear roller work for correct roller Industry；
B. the mode that the table slag on zinc liquid surface generallys use artificial fishing slag is removed；
34) adjustment of air knife, air knife distance are set in 50~80mm, and pressure is set in 300~500bar height and is set in 350mm will not both generate thicker zinc layers in this way, will not cause the splashing of zinc liquid, can effectively reduce the production of zinc granule in this way It is raw, indirectly control the generation of roll marks；
35) the clear roller operation of roller system is carried out,
A. after being switched on, blower fan of cooling tower after plating should be opened in time, the temperature after making strip to tower top should not be too high, should control Between 190~230 DEG C, to prevent hot sticky attached effect, cadmia adheres to roll surface；
B. it not put at once after squeeze roller booting after watch-quench tank, squeeze roller waits unit speed to reach 90 meters/min after watch-quench tank It puts into again afterwards.
4. the method according to claim 2 for reducing Continuous Hot Dip Galvanizing booting roll marks, which is characterized in that the step Rapid 4) levelling withdrowal straightening section concrete operations are as follows: 41) the in due course investment of work roll for temper mill, before booting, it is ensured that each roller of levelling withdrowal straightening exists Off-line state can just be put into after waiting belt steel surface is without rolled tin cadmia, and it is continuous to roll surface progress clear to open high pressure water in time Reason, to prevent the generation of roll marks defect；42) roll surface band water purges, and after strip 30m/min creeps, opens levelling withdrowal straightening section and respectively sprays Pipe, rear each roller scraper smooth at this time not put into, and after waiting belt steel surface zinc layers to stablize, the purging for carrying out compressed air with water is made Industry after the completion of purging, puts into each roller scraper and carries out clear roller operation to roll surface.
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CN107779803B (en) * 2017-09-15 2019-11-19 首钢京唐钢铁联合有限责任公司 A method of avoid galvanized steel from sinking roll marks occur
CN108796421B (en) * 2018-08-24 2020-02-11 上海建立电镀有限公司 Special accurate control system for single-side galvanizing of surface of steel plate
CN111270297B (en) * 2020-03-10 2021-04-13 攀钢集团攀枝花钢铁研究院有限公司 Method for reducing zinc or zinc particle defects of hot-dip galvanized sheet surface strip
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