CN111961997A - Production process of hot-dip galvanized plate for high-strength structure - Google Patents
Production process of hot-dip galvanized plate for high-strength structure Download PDFInfo
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- CN111961997A CN111961997A CN202010778180.1A CN202010778180A CN111961997A CN 111961997 A CN111961997 A CN 111961997A CN 202010778180 A CN202010778180 A CN 202010778180A CN 111961997 A CN111961997 A CN 111961997A
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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
- C21D1/26—Methods of annealing
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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
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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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C2/26—After-treatment
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- 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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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
Abstract
The invention discloses a production process of a hot-dip galvanized plate for a high-strength structure, which comprises the following steps: selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; the method solves the problems that the strength of the hot-dip galvanized steel plate is low, the hot-dip galvanized steel plate is mostly a soft plate, the application range is limited, and the corrosion resistance of the steel plate is easily affected by intergranular corrosion because the strength of the hot-dip galvanized steel plate is often improved by adding more strengthening elements such as Si, Mn and the like in the market, and has the advantages that the strength of the steel plate can be greatly improved, and the adverse effect caused by the improvement of the strength is effectively controlled through each process step, so that the hot-dip galvanized steel plate with high strength, excellent corrosion resistance and processability is prepared.
Description
Technical Field
The invention relates to the technical field of hot-dip galvanized steel sheets, in particular to a production process of a hot-dip galvanized sheet for a high-strength structure.
Background
Galvanization is an economic and effective steel plate corrosion prevention method which is often adopted, and the galvanized steel plate is widely applied to the industries of buildings, light industry, automobiles, agriculture, animal husbandry, fishery, commerce and the like, for example, the building industry is mainly used for manufacturing corrosion prevention industry and civil building roof panels, roof grids and the like; the hot galvanized plate is used for manufacturing shells of household appliances, civil chimneys, kitchen utensils and the like in the light industry, and various production processes are available.
For example, the production process of the hot-dip galvanized sheet disclosed in patent CN106756709B is a production process of a hot-dip galvanized sheet, which has a low strength, is mostly a soft sheet, and has a limited application range, and the strength of the hot-dip galvanized sheet is often increased by adding more strengthening elements such as Si, Mn, etc. in the market, which easily causes intergranular corrosion to affect the corrosion resistance of the sheet.
Disclosure of Invention
The invention aims to provide a production process of a hot-dip galvanized plate for a high-strength structure, which solves the problems that the strength of the existing production process is low, most hot-dip galvanized plates are soft plates, the application range is limited, and the strength of a hot-dip galvanized steel plate is improved by adding more strengthening elements such as Si, Mn and the like in the market, which easily causes intergranular corrosion to influence the corrosion resistance of the steel plate.
In order to achieve the purpose, the invention provides the following technical scheme: a production process of a hot-dip galvanized plate for a high-strength structure comprises the following steps:
step 1: selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate;
step 2: degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times;
and step 3: acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid;
and 4, step 4: annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-;
and 5: passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Preferably, in the step 1, the steel has no defects such as a lotus leaf edge and the like, and the plate shape width of the raw material is required to be executed according to the lower limit of the internal control standard of the galvanizing raw material.
Preferably, in the step 2, the degreasing temperature in the first chemical degreasing is 60-70 ℃, and the degreasing temperature in the second chemical degreasing is 50-60 ℃.
Preferably, in the step 2, the cleaning solution is sprayed onto the steel plate through a high-pressure spray head to remove alkaline residual liquid on the surface of the steel plate.
Preferably, in step 3, the pure water is sprayed onto the steel sheet which has just been pickled, and high-pressure cleaning is performed to remove the pickling solution remaining on the surface of the steel sheet.
Preferably, in the step 4, the furnace pressure of the annealing furnace during heating is increased from 70-80Pa to 120-140 Pa.
Preferably, in the step 4, hydrogen is contained in the annealing furnace, and the concentration of the hydrogen is ensured to be kept at 20%.
Preferably, in the step 4, the cooling speed is controlled to be 35-50 ℃/s, and the temperature of the steel plate is gradually reduced from 740 ℃ to 480 ℃.
Preferably, in step 4, the steel plate is quickly transferred to a cooling tank for quick cooling after being immersed in the zinc liquid for 5 to 10 min.
Preferably, in step 5, the passivation solution contains hydrochloric acid, formic acid, Mercaptobenzothiazole (MBT), a mixture of methylbenzotriazole, sodium fluoride, tartaric acid, phytic acid and oleyl alcohol polyoxyethylene ether.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through setting the process flows of selecting steel, degreasing steel plates, pickling steel plates, annealing hot plating and passivating, the problems that the strength of the existing production process is small, most of the steel plates are soft plates, the application range is limited, and the strength of the hot-dip galvanized steel plate is improved by adding more strengthening elements such as Si, Mn and the like on the market, which easily causes intergranular corrosion to influence the corrosion resistance of the steel plate are solved.
Detailed Description
The present invention will now be described in more detail by way of examples, which are given by way of illustration only and are not intended to limit the scope of the present invention in any way.
The invention provides a technical scheme that: a production process of a hot-dip galvanized plate for a high-strength structure comprises the following steps:
step 1: selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate;
step 2: degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times;
and step 3: acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid;
and 4, step 4: annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-;
and 5: passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
The first embodiment is as follows:
selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Example two:
in the first embodiment, the following steps are added:
in the step 1, the steel has no defects such as lotus leaf edges and the like, the plate shape width of the raw material is required to be executed according to the lower limit of the internal control standard of the galvanizing raw material, and the final product is ensured to be qualified.
Selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Example three:
in the second embodiment, the following steps are added:
in the step 2, the degreasing temperature in the first chemical degreasing is 60-70 ℃, the degreasing temperature in the second chemical degreasing is 50-60 ℃, and the cleaning fluid is sprayed onto the steel plate through the high-pressure spray head to remove alkaline residual liquid on the surface of the steel plate, so that the smooth degreasing process is ensured, and the degreasing effect is achieved.
Selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Example four:
in the third embodiment, the following steps are added:
and 3, spraying pure water onto the steel plate which is just subjected to pickling for high-pressure cleaning, removing the residual pickling solution on the surface of the steel plate, and avoiding the residual pickling solution from entering the next process.
Selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Example five:
in the fourth example, the following steps were added:
in step 4, the furnace pressure of the annealing furnace is increased from 70-80Pa to 120-140Pa during heating, hydrogen is contained in the annealing furnace, and the concentration of the hydrogen is ensured to be kept at 20%, so that the steel plate can be annealed smoothly and efficiently, and the final effect is obtained.
Selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Example six:
in the fifth example, the following steps were added:
in the step 4, the cooling speed is controlled to be 35-50 ℃/s, the temperature of the steel plate is gradually reduced from 740 ℃ to 480 ℃, the steel plate is quickly transferred into a cooling pool for quick cooling after being immersed in zinc liquid for 5-10 min, so that the steel plate can be successfully hot-galvanized, and a good effect is achieved.
Selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Example seven:
in example six, the following steps were added:
in step 5, the passivation solution contains hydrochloric acid, formic acid, Mercaptobenzothiazole (MBT), a mixture of methylbenzotriazole, sodium fluoride, tartaric acid, phytic acid and oleyl alcohol polyoxyethylene ether, so that the passivation effect is ensured, and the risk of the passivation process is reduced.
Selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate; degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times; acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid; annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-; passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A production process of a hot-dip galvanized plate for a high-strength structure is characterized by comprising the following steps: the method comprises the following steps:
step 1: selecting steel: uncoiling a cold-rolled coil steel plate of a raw material finished product, and shearing and shaping the cold-rolled coil steel plate;
step 2: degreasing a steel plate: soaking the steel plate in degreasing fluid to remove various grease pollutants on the surface of the steel plate, wherein the degreasing fluid is aqueous solution containing 4-7% of sodium hydroxide, and the soaking time is 8-15 min, and the total time is two times;
and step 3: acid pickling of steel plates: soaking the degreased steel plate in a pickling tank to remove iron oxide on the surface of the steel plate, wherein the pickling solution is dilute hydrochloric acid;
and 4, step 4: annealing and hot-dip coating: putting the acid-washed steel plate into an annealing furnace, heating the steel plate to the temperature of 730-;
and 5: passivation: and immersing the cooled steel plate in a passivation solution to form a layer of passivation film on the surface of the galvanized part, rinsing with pure water after passivation is finished, and drying by using hot air.
2. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in the step 1, the steel has no defects such as lotus leaf edges and the like, and the plate shape width of the raw material is required to be executed according to the lower limit of the internal control standard of the galvanized raw material.
3. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in the step 2, the degreasing temperature in the first chemical degreasing is 60-70 ℃, and the degreasing temperature in the second chemical degreasing is 50-60 ℃.
4. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: and in the step 2, spraying the cleaning solution onto the steel plate through a high-pressure spray head to remove alkaline residual liquid on the surface of the steel plate.
5. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: and 3, spraying pure water onto the steel plate which is just pickled, and carrying out high-pressure cleaning to remove the residual pickling solution on the surface of the steel plate.
6. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in the step 4, the furnace pressure of the annealing furnace is increased from 70-80Pa to 120-140Pa during heating.
7. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in step 4, hydrogen is contained in the annealing furnace, and the concentration of the hydrogen is ensured to be kept at 20%.
8. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in the step 4, the cooling speed is controlled to be 35-50 ℃/s, and the temperature of the steel plate is gradually reduced from 740 ℃ to 480 ℃.
9. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in the step 4, the steel plate is quickly transferred to a cooling tank for quick cooling after being immersed in the zinc liquid for 5 to 10 min.
10. The production process of the hot-dip galvanized sheet for the high-strength structure according to claim 1, characterized in that: in step 5, the passivation solution contains hydrochloric acid, formic acid, Mercaptobenzothiazole (MBT), a mixture of methylbenzotriazole, sodium fluoride, tartaric acid, phytic acid and oleyl alcohol polyoxyethylene ether.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010778180.1A CN111961997A (en) | 2020-08-05 | 2020-08-05 | Production process of hot-dip galvanized plate for high-strength structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010778180.1A CN111961997A (en) | 2020-08-05 | 2020-08-05 | Production process of hot-dip galvanized plate for high-strength structure |
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| CN111961997A true CN111961997A (en) | 2020-11-20 |
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| CN202010778180.1A Pending CN111961997A (en) | 2020-08-05 | 2020-08-05 | Production process of hot-dip galvanized plate for high-strength structure |
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| CN (1) | CN111961997A (en) |
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| CN106916998A (en) * | 2017-04-21 | 2017-07-04 | 孙健 | A kind of super anticorrosive zinc base alloy layer steel band and its production method |
| CN108754381A (en) * | 2018-07-31 | 2018-11-06 | 江苏大力神科技股份有限公司 | A kind of steel band is aluminized the continuous producing method of zinc chrome |
| CN108796418A (en) * | 2018-06-20 | 2018-11-13 | 华冠新型材料股份有限公司 | Continuous hot-dipping alsimay steel plate and preparation method thereof and plating solution |
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| CN106498286A (en) * | 2016-12-01 | 2017-03-15 | 浙江东南金属薄板有限公司 | The production technology of galvanizing coil of strip |
| CN106756709A (en) * | 2017-03-28 | 2017-05-31 | 海盐哈特惠机械五金制品有限公司 | A kind of production technology and equipments of heat zinc coating plate |
| CN106916998A (en) * | 2017-04-21 | 2017-07-04 | 孙健 | A kind of super anticorrosive zinc base alloy layer steel band and its production method |
| CN108796418A (en) * | 2018-06-20 | 2018-11-13 | 华冠新型材料股份有限公司 | Continuous hot-dipping alsimay steel plate and preparation method thereof and plating solution |
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