CN112195401A - Production method of super-thick zinc layer hot-dip galvanized steel coil - Google Patents
Production method of super-thick zinc layer hot-dip galvanized steel coil Download PDFInfo
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- CN112195401A CN112195401A CN202011023742.8A CN202011023742A CN112195401A CN 112195401 A CN112195401 A CN 112195401A CN 202011023742 A CN202011023742 A CN 202011023742A CN 112195401 A CN112195401 A CN 112195401A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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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
- C23C2/04—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
- 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
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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
- 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
Abstract
The invention belongs to the technical field of metallurgyIn particular to a production method of a hot-dip galvanized steel coil with an ultra-thick zinc layer. The strip steel of the hot galvanized steel coil comprises the following chemical components in percentage by mass: c is less than or equal to 0.08 percent, Si is less than or equal to 0.05 percent, Mn: less than or equal to 1.60 percent, P: less than or equal to 0.018 percent, less than or equal to 0.002 percent of S, and the balance of iron and inevitable impurity elements. The production method of the hot galvanized coil at least comprises the following steps: the strip steel is made into a galvanized coil through hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling. The invention limits the mass percentage of C, Mn and Si elements in the steel plate raw material, and regulates and controls the annealing temperature and other parameters, thereby reducing the cost and simultaneously leading the zinc layer of the prepared ultra-thick zinc layer hot dip galvanized steel coil to reach 1000g/m2The yield strength is more than or equal to 420MPa, the tensile strength is more than or equal to 500MPa, the surface quality is good, the coating binding force is strong, and the mechanical property is stable.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a super-thick zinc layer hot-dip galvanized coil and a production method thereof.
Background
With the rapid development of the national economic construction, the using amount of steel is increased day by day, the quality requirement on the steel is also continuously improved, and particularly, the corrosion resistance of the strip steel is higher due to the rapid development of the industries such as underground pipe gallery, steel plate warehouse and the like. The galvanized steel sheet has the advantages of strong corrosion resistance, excellent surface quality, good processing performance, high cost performance and the like, and is more and more favored by customers.
It is well known that the thicker the galvanized layer, the stronger the corrosion resistance of the galvanized sheet. The thicker the zinc coating, the more strict the requirements on the production process, the difficulty still exists in the process for preparing the super-thick zinc coating galvanized sheet in the prior art, the production efficiency is low, the problems of substandard zinc coating thickness, poor performance and the like also exist in the prepared zinc coating, and the 1000g/m at home and abroad is not available at present2The related report of the development success of the super-thick zinc layer pre-galvanized product is that the development of the thick zinc layer is initiated.
Disclosure of Invention
Aiming at the technical problems of substandard zinc layer thickness, poor performance and the like in the preparation process of the super-thick zinc layer in the prior art, the invention provides a production method of a super-thick zinc layer hot-dip galvanized steel coil.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a production method of an ultra-thick zinc layer hot-dip galvanized steel coil comprises the following chemical components in percentage by mass: c is less than or equal to 0.08 percent, Si is less than or equal to 0.05 percent, Mn: less than or equal to 1.0 percent, P: less than or equal to 0.025 percent, less than or equal to 0.05 percent of S, and the balance of Fe and inevitable impurity elements.
The production method of the ultra-thick zinc layer hot galvanized steel coil comprises the steps of carrying out hot rolling, acid washing, leveling, annealing, galvanizing, finishing and coiling on the strip steel to prepare the galvanized coil.
The annealing is carried out in an induction heating furnace, the temperature of the strip steel in each process section is controlled, wherein the temperature of the strip steel in a direct combustion section is 660 +/-20 ℃, the temperature of the strip steel in a radiation section is 650 +/-20 ℃, the temperature of the strip steel in a soaking section is 600 +/-20 ℃, and the temperature of the strip steel in a cooling section is: 420 +/-10 ℃ and the dew point in the furnace is less than or equal to-40 ℃.
Compared with the prior art, the mass percentage of Si in the strip steel of the ultra-thick zinc layer hot-galvanized steel coil is less than or equal to 0.05%, the surface aggregation of the strip steel can be effectively avoided, the adhesion of a zinc layer is reduced, and meanwhile, the mass percentage of C, Mn is preferably selected, so that the mechanical property of the steel coil can be ensured under the condition of reducing the dosage of microalloy. The chemical components and the proportion thereof are combined with the regulation and control of annealing temperature in the production process, so that the cost is reduced, and the zinc layer of the prepared super-thick zinc layer hot dip galvanized steel coil can reach 1000g/m2The plating layer has strong binding force, the yield strength is more than or equal to 420MPa, the tensile strength is more than or equal to 500MPa, and the mechanical property is stable.
Preferably, the hot rolling comprises heating, controlled rolling, controlled cooling and curling, wherein the controlled rolling comprises rough rolling and finish rolling, and the outlet temperature of the rough rolling is 1060 +/-20 ℃; the outlet temperature of the finish rolling is 880 +/-20 ℃.
Preferably: laminar cooling is adopted in the controlled rolling cooling process, the cooling speed is 25-30 ℃/s, and the curling temperature is 590-.
The optimal temperature setting and cooling speed can improve the surface quality of the hot-rolled steel plate and the surface roughness of the steel plate, thereby improving the adhesive force of zinc on the surface of the steel plate and laying a foundation for manufacturing an ultra-thick zinc layer.
Preferably, in the pickling process: adopting three-groove turbulent pickling, wherein: the concentration of iron ions in the No. 1 acid tank is 110-135 g/L, the concentration of total acid is 185-210g/L, the concentration of iron ions in the No. 2 acid tank is 80-100 g/L, the concentration of total acid is 185-210g/L, the concentration of iron ions in the No. 3 acid tank is 30-50g/L, the concentration of total acid is 185-210g/L, and the temperature is controlled to be 75-80 ℃ in the whole acid washing process.
Preferably, the roughening roller is used as a working roller for leveling, and the leveling elongation is 0.8-1.0%.
The optimized concentration of the pickling solution and the leveling working roll can effectively remove impurities on the surface of the strip steel, improve the surface roughness of the strip steel and improve the adhesiveness of a zinc layer.
Preferably, the galvanizing comprises zinc liquid soaking and air knife blowing, wherein the zinc liquid soaking is carried out in a zinc pot, the temperature of the strip steel when being immersed in the zinc liquid is 455 +/-5 ℃, the temperature of the zinc liquid is 460 +/-2 ℃, and the temperature of the strip steel when being immersed in the zinc liquid and the temperature of the zinc liquid are preferably selected, so that the large temperature fluctuation of the zinc liquid in the zinc pot caused by the high core temperature of the strip steel can be avoided, the zinc layer can be solidified more quickly, and the adhesiveness of the thick zinc layer is ensured.
Preferably, the mass percentage content of Zn element in the zinc liquid is more than or equal to 99%, and the mass percentage content of Al element is 0.2 +/-0.05%.
Preferably, the basic parameters of the air knife blow are: the pressure of the upper air knife and the lower air knife is 45-60 mbar, the height of the air knife from the zinc liquid is 50-90 mm, the distance of the air knife from the strip steel is 45-80 mm for example, and the angle of the air knife is controlled to be minus 20 +/-5 degrees.
The optimal air knife distance to the zinc liquid level and the air knife pressure reduction can ensure the thickness and uniformity of the zinc layer, and the optimal air knife angle can avoid the formation of turbulent flow and improve the surface quality.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A production method of a super-thick zinc layer hot-dip galvanized steel coil comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a galvanized coil.
The strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.08 percent of C, 0.05 percent of Si, 1.60 percent of Mn, 0.018 percent of P, 0.002 percent of S and the balance of Fe and inevitable impurity elements;
the strip steel containing the components is heated by a heating furnace and then is subjected to hot rolling, the hot rolling process specifically comprises the steps of controlled rolling, controlled cooling and coiling, the controlled rolling process comprises rough rolling and finish rolling, wherein the outlet temperature of the rough rolling is 1060 ℃, the outlet temperature of the finish rolling is 880 ℃, the laminar cooling speed in the cooling process is controlled to be 25 ℃/s, and the coiling temperature is 610 ℃;
in the acid washing process: 3-groove turbulent acid pickling is adopted, wherein the concentration of iron ions in a 1# acid groove is 110g/L, the total acid concentration is 185g/L, the concentration of iron ions in a 2# acid groove is 80g/L, the total acid concentration is 185g/L, the concentration of iron ions in a 3# acid groove is 30g/L, the total acid concentration is 185g/L, and the acid pickling temperature is 75 ℃;
leveling by using a texturing roller as a working roller, wherein the leveling elongation is 0.8%;
the annealing step is performed in an induction heating furnace: controlling the temperature of the strip steel in each process section, wherein the temperature of the strip steel in an open fire section is 660 ℃, the temperature of the strip steel in a radiant tube section is 650 ℃, the temperature of the strip steel in a soaking section is 600 ℃, and the temperature of the strip steel in a cooling section is 420 ℃; the dew point of the induction heating furnace is-40 ℃;
the galvanizing procedure comprises zinc liquid soaking and air knife blowing processes, wherein the temperature of the strip steel in a zinc pot is 455 ℃, the temperature of the zinc liquid is 460 ℃, the mass percent of Zn in the zinc liquid in the zinc pot is 99%, and the Al content is 0.2%;
in the air knife blowing process, the pressure of an upper air knife and a lower air knife is 45mbar, the height of the air knife from zinc liquid is 50mm, the distance of the air knife from strip steel is 45mm, and the angle of the air knife is-25 degrees.
Example 2
A production method of a super-thick zinc layer hot-dip galvanized steel coil comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a galvanized coil.
The strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.07 percent of C, 0.04 percent of Si, 1.70 percent of Mn, 0.018 percent of P, 0.002 percent of S and the balance of Fe and inevitable impurity elements;
the strip steel containing the components is heated by a heating furnace and then is subjected to hot rolling, the hot rolling process specifically comprises the steps of controlled rolling, controlled cooling and coiling, the controlled rolling process comprises rough rolling and finish rolling, wherein the outlet temperature of the rough rolling is 1040 ℃, the outlet temperature of the finish rolling is 860 ℃, the laminar cooling speed in the cooling process is controlled to be 27 ℃/s, and the coiling temperature is 590 ℃;
in the acid washing process: adopting 3-groove turbulent acid pickling, wherein the concentration of iron ions in a 1# acid groove is 125g/L, the concentration of total acid is 195g/L, the concentration of iron ions in a 2# acid groove is 90g/L, the concentration of total acid is 195g/L, the concentration of iron ions in a 3# acid groove is 40g/L, the concentration of total acid is 195g/L, and the pickling temperature is 75 ℃;
leveling by using a texturing roller as a working roller, wherein the leveling elongation is 0.8%;
the annealing step is performed in an induction heating furnace: controlling the temperature of the strip steel in each process section, wherein the temperature of the strip steel in an open fire section is 640 ℃, the temperature of the strip steel in a radiant tube section is 630 ℃, the temperature of the strip steel in a soaking section is 580 ℃, and the temperature of the strip steel in a cooling section is 410 ℃; the dew point of the induction heating furnace is-45 ℃;
the galvanizing procedure comprises zinc liquid soaking and air knife blowing processes, wherein the temperature of the strip steel in a zinc pot is 450 ℃, the temperature of zinc liquid is 458 ℃, the mass percentage content of Zn in the zinc liquid in the zinc pot is 99.1 percent, and the Al content is 0.15 percent;
in the air knife blowing process, the pressure of an upper air knife and a lower air knife is 50mbar, the height of the air knife from zinc liquid is 70mm, the distance of the air knife from strip steel is 65mm, and the angle of the air knife is-20 degrees.
Example 3
A production method of a super-thick zinc layer hot-dip galvanized steel coil comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a galvanized coil.
The strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.08 percent of C, 0.05 percent of Si, 1.80 percent of Mn, 0.018 percent of P, 0.002 percent of S and the balance of Fe and inevitable impurity elements;
the strip steel containing the components is heated by a heating furnace and then is subjected to hot rolling, the hot rolling process specifically comprises the steps of controlled rolling, controlled cooling and reeling, and the controlled rolling process comprises rough rolling and finish rolling, wherein the outlet temperature of the rough rolling is 1080 ℃, the outlet temperature of the finish rolling is 900 ℃, the laminar flow cooling speed in the controlled cooling process is 30 ℃/s, and the reeling temperature is 630 ℃;
in the acid washing process: 3-tank turbulent acid pickling is adopted, wherein the concentration of iron ions in a 1# acid tank is 135g/L, the concentration of total acid is 210g/L, the concentration of iron ions in a 2# acid tank is 100g/L, the concentration of total acid is 210g/L, the concentration of iron ions in a 3# acid tank is 50g/L, the concentration of total acid is 210g/L, and the acid pickling temperature is 80 ℃;
leveling by using a texturing roller as a working roller, wherein the leveling elongation is 1.0%;
the annealing step is performed in an induction heating furnace: controlling the temperature of the strip steel in each process section, wherein the temperature of the strip steel in an open fire section is 680 ℃, the temperature of the strip steel in a radiant tube section is 670 ℃, the temperature of the strip steel in a soaking section is 620 ℃, and the temperature of the strip steel in a cooling section is 430 ℃; the dew point of the induction heating furnace is-40 ℃;
the galvanizing procedure comprises zinc liquid soaking and air knife blowing processes, wherein the temperature of the strip steel in a zinc pot is 460 ℃, the temperature of zinc liquid is 462 ℃, the mass percentage content of Zn in the zinc liquid in the zinc pot is 99 percent, and the Al content is 0.25 percent;
in the air knife blowing process, the pressure of an upper air knife and a lower air knife is 60mbar, the height of the air knife from zinc liquid is 90mm, the distance of the air knife from strip steel is 80mm, and the angle of the air knife is-25 degrees.
Example 4
A production method of a super-thick zinc layer hot-dip galvanized steel coil comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a galvanized coil.
The strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.08 percent of C, 0.05 percent of Si, 1.61 percent of Mn, 0.018 percent of P, 0.002 percent of S and the balance of Fe and inevitable impurity elements;
the strip steel containing the components is heated by a heating furnace and then is subjected to hot rolling, the hot rolling process specifically comprises the steps of controlled rolling, controlled cooling and coiling, the controlled rolling process comprises rough rolling and finish rolling, wherein the outlet temperature of the rough rolling is 1043 ℃, the outlet temperature of the finish rolling is 893 ℃, the laminar cooling speed in the cooling process is controlled to be 27 ℃/s, and the coiling temperature is 608 ℃;
in the acid washing process: 3-tank turbulent acid pickling is adopted, wherein the concentration of iron ions in a 1# acid tank is 126g/L, the concentration of total acid is 190g/L, the concentration of iron ions in a 2# acid tank is 93g/L, the concentration of total acid is 190g/L, the concentration of iron ions in a 3# acid tank is 45g/L, the concentration of total acid is 190g/L, and the acid pickling temperature is 75 ℃;
leveling by using a texturing roller as a working roller, wherein the leveling elongation is 0.8%;
the annealing step is performed in an induction heating furnace: controlling the temperature of the strip steel in each process section, wherein the temperature of the strip steel in the open fire section is 646 ℃, the temperature of the strip steel in the radiation section is 659 ℃, the temperature of the strip steel in the soaking section is 585 ℃, and the temperature of the strip steel in the cooling section is 429 ℃; the dew point of the induction heating furnace is-45 ℃;
the galvanizing procedure comprises zinc liquid soaking and air knife blowing processes, wherein the temperature of the strip steel entering a zinc pot is 455 ℃, the temperature of zinc liquid is 461 ℃, the mass percentage content of Zn in the zinc liquid in the zinc pot is 99.1 percent, and the Al content is 0.176 percent;
in the air knife blowing process, the pressure of an upper air knife and a lower air knife is 45mbar, the height of the air knife from zinc liquid is 90mm, the distance of the air knife from strip steel is 60mm, and the angle of the air knife is-23.9 degrees.
Example 5
A production method of a super-thick zinc layer hot-dip galvanized steel coil comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a galvanized coil.
The strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.08 percent of C, 0.04 percent of Si, 1.68 percent of Mn, 0.03 percent of P, 0.005 percent of S and the balance of Fe and inevitable impurity elements;
the strip steel containing the components is heated by a heating furnace and then is subjected to hot rolling, the hot rolling process specifically comprises the steps of controlled rolling, controlled cooling and coiling, the controlled rolling process comprises rough rolling and finish rolling, wherein the outlet temperature of the rough rolling is 1052 ℃, the outlet temperature of the finish rolling is 887 ℃, the laminar cooling speed in the cooling process is controlled to be 25 ℃/s, and the coiling temperature is 580 ℃;
in the acid washing process: 3-tank turbulent acid pickling is adopted, wherein the concentration of iron ions in a 1# acid tank is 126g/L, the concentration of total acid is 190g/L, the concentration of iron ions in a 2# acid tank is 93g/L, the concentration of total acid is 190g/L, the concentration of iron ions in a 3# acid tank is 45g/L, the concentration of total acid is 190g/L, and the acid pickling temperature is 80 ℃;
leveling by using a texturing roller as a working roller, wherein the leveling elongation is 0.8%;
the annealing step is performed in an induction heating furnace: controlling the temperature of the strip steel in each process section, wherein the temperature of the strip steel in the open fire section is 643 ℃, the temperature of the strip steel in the radiant tube section is 649 ℃, the temperature of the strip steel in the soaking section is 609 ℃ and the temperature of the strip steel in the cooling section is 428 ℃; the dew point of the induction heating furnace is-40 ℃;
the galvanizing procedure comprises zinc liquid soaking and air knife blowing processes, wherein the temperature of the strip steel in a zinc pot is 458 ℃, the temperature of zinc liquid is 460 ℃, the mass percentage content of Zn in the zinc liquid in the zinc pot is 99 percent, and the Al content is 0.22 percent;
in the air knife blowing process, the pressure of an upper air knife and a lower air knife is 45mbar, the height of the air knife from zinc liquid is 85mm, the distance of the air knife from strip steel is 66mm, and the angle of the air knife is-22 degrees.
Comparative example 1
A production method of a hot-dip galvanized steel coil with an ultra-thick zinc layer comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a galvanized coil;
the strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.10 percent of C, 0.05 percent of Si, 1.70 percent of Mn, 0.018 percent of P, 0.002 percent of S and the balance of Fe and inevitable impurity elements;
the other procedures and process parameters were the same as in example 1.
Comparative example 2
A production method of a hot-galvanized steel coil with an ultra-thick zinc layer comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a hot-galvanized steel coil; the strip steel of the steel coil comprises the following chemical components in percentage by mass:
0.08 percent of C, 0.10 percent of Si, 1.60 percent of Mn, 0.018 percent of P, 0.002 percent of S and the balance of Fe and inevitable impurity elements;
the other procedures and process parameters were the same as in example 1.
Comparative example 3
A production method of a hot-galvanized steel coil with an ultra-thick zinc layer comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a hot-galvanized steel coil;
the strip steel components of the steel coil are consistent with those of the embodiment 1;
the other procedures and process parameters were the same as those in example 1 except that the temperature of the open fire zone of the strip steel in the annealing procedure was 700 ℃.
Comparative example 4
A production method of a hot-galvanized steel coil with an ultra-thick zinc layer comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a hot-galvanized steel coil;
the strip steel components of the steel coil are consistent with those of the embodiment 1;
the other procedures and process parameters are the same as those of the example 1 except that the temperature of the strip steel output radiation pipe section in the annealing procedure is 680 ℃.
Comparative example 5
A production method of a hot-galvanized steel coil with an ultra-thick zinc layer comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a hot-galvanized steel coil;
the strip steel components of the steel coil are consistent with those of the embodiment 1;
the other procedures and process parameters are the same as those of the example 1 except that the temperature of the strip steel in the annealing procedure is 650 ℃.
Comparative example 6
A production method of a hot-galvanized steel coil with an ultra-thick zinc layer comprises the steps of hot rolling, acid cleaning, leveling, annealing, galvanizing, finishing and coiling to prepare a hot-galvanized steel coil;
the strip steel components of the steel coil are consistent with those of the embodiment 1;
the other procedures and process parameters were the same as those in example 1 except that the strip steel outlet cooling section temperature in the annealing procedure was 500 ℃.
Examination example
The results of examining the galvanizing effect and mechanical properties of the ultra-thick galvanized steel coils obtained in examples 1 to 5 and comparative examples 1 to 6 are shown in table 1.
TABLE 1 galvanization effect and mechanical Properties
The above examples and comparative examples prove that the double faces of the ultra-thick zinc layer hot-dip galvanized steel coil produced by the technical scheme of the invention can reach 1000g/m2And the yield strength is more than or equal to 420MPa, the tensile strength is more than or equal to 500MPa, and the mechanical property is stable.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A production method of a super-thick zinc layer hot-dip galvanized steel coil is characterized by comprising the following steps:
the strip steel of the ultra-thick zinc layer hot galvanized steel coil comprises the following chemical components in percentage by mass: less than or equal to 0.08 percent of C, less than or equal to 0.05 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.018 percent of P, less than or equal to 0.002 percent of S, and the balance of iron and inevitable impurity elements;
the production method of the ultra-thick zinc layer hot galvanized steel coil comprises the steps of carrying out hot rolling, acid washing, leveling, annealing, galvanizing, finishing and coiling on the strip steel to prepare a galvanized coil;
the annealing is carried out in an induction heating furnace, wherein the temperature of the strip steel in a direct combustion section is 660 +/-20 ℃, the temperature of the strip steel in a radiation pipe section is 650 +/-20 ℃, the temperature of the strip steel in a soaking section is 600 +/-20 ℃, and the temperature of the strip steel in a cooling section is: 420 +/-10 ℃ and the dew point in the furnace is less than or equal to-40 ℃.
2. The method for producing a hot-dip galvanized steel coil with an ultra-thick zinc layer as claimed in claim 1, characterized in that the hot rolling comprises heating, controlled rolling, controlled cooling and coiling, the controlled rolling comprises rough rolling and finish rolling, wherein the outlet temperature of the rough rolling is 1060 ± 20 ℃, and the outlet temperature of the finish rolling is 880 ± 20 ℃.
3. The production method of the ultra-thick zinc layer hot-galvanized steel coil as claimed in claim 2, characterized in that the controlled cooling process adopts laminar cooling at a cooling speed of 25-30 ℃/s; the coiling temperature is 610 +/-20 ℃.
4. The method for producing the ultra-thick zinc layer hot-dip galvanized steel coil as claimed in claim 1, wherein the pickling process adopts three-groove turbulent pickling, wherein the concentration of iron ions in the 1# acid groove is 110-135 g/L, the total concentration of acid is 185-210g/L, the concentration of iron ions in the 2# acid groove is 80-100 g/L, the concentration of total acid is 185-210g/L, the concentration of iron ions in the 3# acid groove is 30-50g/L, the concentration of total acid is 185-210g/L, and the pickling temperature is 75-80 ℃.
5. The method for producing the ultra-thick zinc layer hot-galvanized steel coil according to claim 4, characterized in that the roughing roll is used as a working roll for leveling, and the leveling elongation is 0.8-1.0%.
6. The method for producing the ultra-thick zinc layer hot-galvanized steel coil according to claim 1, wherein the galvanizing comprises zinc solution soaking and air knife blowing, wherein the zinc solution soaking is carried out in a zinc pot, the temperature of the strip steel is 455 +/-5 ℃ when the strip steel is soaked in the zinc solution, and the temperature of the zinc solution is 460 +/-2 ℃.
7. The method for producing the hot-galvanized steel coil with the ultra-thick zinc layer as claimed in claim 6, wherein the mass percentage of Zn in the zinc liquid is not less than 99%, and the mass percentage of Al is 0.2 +/-0.05%.
8. The method for producing the ultra-thick zinc layer hot-galvanized steel coil according to claim 6, characterized in that the basic parameters of the air knife blowing process are as follows: the pressure of the upper air knife and the lower air knife is 45-60 mbar, the height of the air knife from the zinc liquid is 50-90 mm, the distance of the air knife from the strip steel is 45-80 mm, and the angle of the air knife is controlled to be minus 20 +/-5 degrees.
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| CN113046674A (en) * | 2021-03-31 | 2021-06-29 | 常熟科弘材料科技有限公司 | Preparation process of thin hot-dip galvanized steel plate and thin hot-dip galvanized steel plate |
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| CN114318143A (en) * | 2021-12-22 | 2022-04-12 | 河钢股份有限公司承德分公司 | Thick-specification non-flower hot-dip galvanized steel coil and preparation method thereof |
| CN115233132A (en) * | 2022-06-08 | 2022-10-25 | 河钢股份有限公司承德分公司 | Method for controlling edge curling thickness of non-flower hot-base galvanized steel |
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| CN114318143A (en) * | 2021-12-22 | 2022-04-12 | 河钢股份有限公司承德分公司 | Thick-specification non-flower hot-dip galvanized steel coil and preparation method thereof |
| CN115233132A (en) * | 2022-06-08 | 2022-10-25 | 河钢股份有限公司承德分公司 | Method for controlling edge curling thickness of non-flower hot-base galvanized steel |
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