CN110923567A - Zinc-flower-free 700g super-thick zinc layer hot-dip galvanized sheet and production method thereof - Google Patents
Zinc-flower-free 700g super-thick zinc layer hot-dip galvanized sheet and production method thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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Abstract
The invention relates to the technical field of galvanized plates, in particular to a hot-dip galvanized plate without zinc flowers and with a 700g super-thick zinc layer and a production method thereof. The method comprises a full-headless sheet billet continuous casting and rolling process of a headless strip steel production line and an acid plating continuous production line, wherein the full-headless sheet billet continuous casting and rolling process of the headless strip steel production line produces smelting components of hot rolled strips: c is less than or equal to 0.12 percent, Si is less than or equal to 0.45 percent, Mn: less than or equal to 0.55 percent, P: less than or equal to 0.10 percent, less than or equal to 0.045 percent, Fe: the balance; directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking furnace, wherein the outlet temperature of finish rolling is 820-870 ℃, and the coiling temperature is 635-700 ℃; the acid plating continuous production line comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil. The product of the invention has good surface quality, high dimensional precision, strong coating binding force and stable performance.
Description
Technical Field
The invention relates to the technical field of galvanized plates, in particular to a hot-dip galvanized plate without zinc flowers and with a 700g super-thick zinc layer and a production method thereof.
Background
The galvanized sheet has increased corrosion resistance with the increase of the thickness of the zinc layer. Tradition 700g/m2The hot-dip galvanized sheet with the ultra-thick zinc layer is provided with spangles, and the traditional spangled product is severely limited by the use of the industry due to environmental protection factors. The acid pickling and galvanizing process is carried out by adopting a hot-base continuous acid pickling and galvanizing combined machine set, the highest process speed can reach 170 m/min, the product is an environment-friendly galvanized product, but 700g/m is produced by utilizing the combined machine set through a hot-base continuous acid pickling and galvanizing method2When the super-thick zinc layer hot galvanizing strip steel plate is used, the product quality can not meet the requirement all the time, and the method mainly comprises the following steps: 1. the air knife lines of the zinc layer on the surface are serious, and 2, the edge of the zinc layer is thickened, so that the quality of the board is not ideal.
Disclosure of Invention
Aiming at the existingThe invention provides a hot-dip galvanized sheet without spangles and with 700g of super-thick zinc layer and a production method thereof, and the hot-dip galvanized sheet has the advantage that the scheme can realize the spangless and 700g/m of 1.5-2.5mm specification2The super-thick zinc layer hot galvanizing is produced, and the product has good surface quality, high dimensional precision, strong coating binding force and stable performance.
The technical scheme of the invention is as follows:
a hot-dip galvanized sheet without zinc flower 700g super-thick zinc layer and its production method, including the continuous casting and rolling process of the endless thin slab of endless strip production line and the continuous production line of acid plating, its characteristic lies in:
the full-headless thin slab continuous casting and rolling process of the headless strip steel production line produces the smelting components of the hot rolled strip steel:
c is less than or equal to 0.12 percent, Si is less than or equal to 0.45 percent, Mn: less than or equal to 0.55 percent, P: less than or equal to 0.10 percent, less than or equal to 0.045 percent, Fe: the balance;
directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking furnace, wherein the outlet temperature of finish rolling is 820-870 ℃, and the coiling temperature is 635-700 ℃;
the acid plating continuous production line comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;
the pickling process has the following requirements: acid tank HCL content: 40-70g/L, acid washing temperature: 70-85 ℃;
the leveling process has the leveling elongation rate of 0.8-1.2% in the front of the furnace and the leveling elongation rate of 0.8-1.3% in the back of the furnace;
the heating adopts an induction heating furnace: the soaking section of the radiant tube is 510 ℃, the spraying air cooling section is 490 ℃, and the plate temperature is 500-520 ℃;
in the galvanizing process, the aluminum content of the zinc liquid component in the zinc pot is 0.23% +/-0.03? The temperature of the strip steel entering a zinc pot is more than or equal to 490 ℃, and the temperature of zinc liquid in the zinc pot is more than or equal to 462 ℃;
the finishing process is performed (1.3% -3.0%) +/-0.2%.
Preferably, the galvanized sheet is a double-sided equal-thickness galvanized or differential-thickness galvanized sheet with the thickness of 1.5mm-2.5mm, and the coating weight is 700g/m2。
Preferably, in the galvanizing process, the pressure of an upper air knife and a lower air knife is 40mbar-60mbar, the height of the air knife from a zinc liquid is 140mm-200mm, the distance of the air knife from a strip steel is 15mm-30mm, and the angle of the air knife is-25 degrees to-15 degrees.
Preferably, the induction heating furnace dew point: below-45 ℃.
Preferably, the smelting components of the hot-rolled steel strip are as follows: 0.04102% of C, 0.03998% of Si, 0.08422% of Mn, 0.01849% of P, 0.00024% of S, Fe: and (4) the balance.
Preferably, the smelting components of the hot-rolled steel strip are as follows: 0.03698% of C, 0.03678% of Si, 0.08791% of Mn, 0.01534% of P, 0.00285% of S, Fe: and (4) the balance.
Preferably, the smelting components of the hot-rolled steel strip are as follows: 0.04675% of C, 0.04117% of Si, 0.07456% of Mn, 0.01238% of P, 0.00158% of S, Fe: and (4) the balance.
The invention has the beneficial effects that:
the invention adopts the continuous casting and rolling process of the endless thin slab on the endless strip steel production line and the continuous phase line of the acid plating production line to match, the obtained product has good surface quality, stable performance and dimensional deviation and excellent plating binding force, can replace a patterned galvanized plate with the zinc layer weight of 700 g/square meter, can shorten the process flow, save energy, reduce cost and has considerable social and economic benefits.
Drawings
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive effort.
FIG. 1 shows the appearance of the coating of the sample of the present invention under a scanning electron microscope.
FIG. 2 is a cross-sectional energy spectrum analysis of a sample coating according to the present invention for each atomic mass percentage.
FIG. 3 shows the appearance and line scanning results of the galvanized layer on the section of the sample.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the present invention.
Example 1
A hot-dip galvanized sheet without zinc flower 700g super-thick zinc layer and a production method thereof comprise a full-headless thin slab continuous casting and rolling process of a headless strip steel production line and an acid plating continuous production line:
the smelting components of the hot rolled steel strip produced by the full-endless thin slab continuous casting and rolling process of the endless strip steel production line are as follows:
0.04102% of C, 0.03998% of Si, 0.08422% of Mn, 0.01849% of P, 0.00024% of S, Fe: the balance;
directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking pit, wherein the outlet temperature of finish rolling is 825 ℃ and the coiling temperature is 680 ℃;
the acid plating continuous production line comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;
the pickling process requires: acid tank HCL content: 52g/L, acid washing temperature: 75 deg.C
Leveling process, wherein the leveling elongation in the front of the furnace is 1.0 percent, and the leveling elongation in the back of the furnace is 1.3 percent;
the heating adopts an induction heating furnace: the soaking section of the radiant tube is 494 ℃, the jet air cooling section is 485 ℃ and the plate temperature is 471 ℃;
the galvanizing process comprises the following steps of: the Zn content is more than or equal to 99 percent, and the Al content is 0.21 percent; temperature of zinc liquid: 460 ℃;
the finishing process is performed (1.3% -3.0%) +/-0.2%.
The galvanized sheet is a double-sided equal-thickness galvanized sheet with the thickness of 2.0mm, and the weight of the coating is 700g/m2。
The galvanizing technology comprises the steps that the pressure of an upper air knife and a lower air knife is 50mbar, the height of the air knife from a zinc liquid is 275mm, the distance of the air knife from a strip steel is 15.5mm, the angle of the air knife is-0.2 of the angle of the upper air knife, the angle of the lower air knife is-0.8, and the energy medium of the air knife is 99.9% pure nitrogen.
Dew point of induction heating furnace: below-45 ℃.
A hot-dip galvanized sheet having a zinc layer of example 12.0 mm on both sides was produced.
Example 2
A hot-dip galvanized sheet without zinc flower 700g super-thick zinc layer and a production method thereof comprise a full-headless thin slab continuous casting and rolling process of a headless strip steel production line and an acid plating continuous production line:
the smelting components of the hot rolled steel strip produced by the full-endless thin slab continuous casting and rolling process of the endless strip steel production line are as follows:
0.03698% of C, 0.03678% of Si, 0.08791% of Mn, 0.01534% of P, 0.00285% of S, Fe: the balance;
directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking pit, wherein the outlet temperature of finish rolling is 862 ℃, and the coiling temperature is 685 ℃;
the acid plating continuous production line comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;
the pickling process requires: acid tank HCL content: 65g/L, acid washing temperature: 72 ℃;
leveling process, wherein the leveling elongation in the front of the furnace is 0.9 percent, and the leveling elongation in the back of the furnace is 1.8 percent;
the heating adopts an induction heating furnace: the soaking section of the radiant tube is 488 ℃, the spraying air cooling section is 469 ℃, and the plate temperature is 466 ℃;
the galvanizing process comprises the following steps of: the Zn content is more than or equal to 99 percent, and the Al content is 0.22 percent; temperature of zinc liquid: 460 ℃;
the finishing process is performed (1.3% -3.0%) +/-0.2%.
The galvanized sheet is a double-sided equal-thickness galvanized sheet with the thickness of 1.2mm, and the weight of the coating is 700g/m2。
The galvanizing process comprises the steps of ensuring that the pressure of an upper air knife and a lower air knife is 48mbar, ensuring that the height of the air knife from a zinc liquid is 270mm, ensuring that the distance of the air knife from a strip steel is 18.2mm, ensuring that the angle of the air knife is-0.1 of the angle of the upper air knife and-0.6 of the angle of the lower air knife, and ensuring that an energy medium of the air knife is 99.9 percent pure nitrogen.
Dew point of induction heating furnace: below-45 ℃.
A hot-dip galvanized sheet having a zinc layer of example 21.2 mm on both sides and having an equal thickness was obtained.
Example 3
A hot-dip galvanized sheet without zinc flower 700g super-thick zinc layer and a production method thereof comprise a full-headless thin slab continuous casting and rolling process of a headless strip steel production line and an acid plating continuous production line:
the smelting components of the hot rolled steel strip produced by the full-endless thin slab continuous casting and rolling process of the endless strip steel production line are as follows:
0.04675% of C, 0.04117% of Si, 0.07456% of Mn, 0.01238% of P, 0.00158% of S, Fe: the balance;
directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking furnace, wherein the outlet temperature of finish rolling is 848 ℃, and the coiling temperature is 655 ℃;
the acid plating continuous production line comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;
the pickling process requires: acid tank HCL content: 60g/L, acid washing temperature: 82 ℃;
the leveling process comprises the steps that the leveling elongation in the front of the furnace is 1.1%, and the leveling elongation in the back of the furnace is 1.5%;
the heating adopts an induction heating furnace: the soaking section of the radiant tube is 497 ℃, the spraying air cooling section is 469 ℃, and the plate temperature is 469 ℃;
the galvanizing process comprises the following steps of: the Zn content is more than or equal to 99 percent, and the Al content is 0.24 percent; temperature of zinc liquid: 466 ℃;
the finishing process is performed (1.3% -3.0%) +/-0.2%.
The galvanized sheet is a double-sided equal-thickness galvanized sheet with the thickness of 1.8mm, and the weight of the coating is 700g/m2。
The galvanizing process comprises the steps of enabling the pressure of an upper air knife and a lower air knife to be 53mbar, enabling the height of the air knife to be 208mm from a zinc liquid, enabling the distance of the air knife to be 23.2mm from a strip steel, enabling the angle of the air knife to be-0.3 of the angle of the upper air knife and the angle of the lower air knife to be-0.7 of the angle of the lower air knife, and enabling an energy medium of the air knife.
Dew point of induction heating furnace: below-45 ℃.
A hot-dip galvanized sheet having a zinc layer of example 31.8 mm on both sides and having an equal thickness was obtained.
Experimental data:
the zinc layers of the galvanized sheets produced in examples 1 to 3 were examined as shown in Table 1 below.
Table 1 examples 1-3 product zinc layer testing
The appearance of the galvanized layer on the section under an electron microscope is shown in figure 1 by performing energy spectrum analysis on the section of the plating layer in example 2.
Table 2 energy spectrum analysis result (atomic mass% in/%) of a cross section of a sample of example 2
| Spectrogram | Zn | C | O | Fe | Al |
| 1 | 83.34 | 10.99 | 3.82 | 1.85 | / |
| 2 | 88.76 | 9.87 | / | 1.37 | / |
| 3 | 38.49 | 8.69 | / | 43.45 | 9.37 |
The appearance of the cross-section zinc coating of the sample of example 2 is shown in fig. 2, and the line scanning result is shown in fig. 3.
In view of the above, it is desirable to provide,
although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and the spirit of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A hot-dip galvanized sheet without zinc flower 700g super-thick zinc layer and its production method, including the continuous casting and rolling process of the endless thin slab of endless strip production line and the continuous production line of acid plating, its characteristic lies in:
the full-headless thin slab continuous casting and rolling process of the headless strip steel production line produces the smelting components of the hot rolled strip steel:
c is less than or equal to 0.12 percent, Si is less than or equal to 0.45 percent, Mn: less than or equal to 0.55 percent, P: less than or equal to 0.10 percent, less than or equal to 0.045 percent, Fe: the balance;
directly carrying out hot rolling on the casting blank without heating the casting blank by a soaking furnace, wherein the outlet temperature of finish rolling is 820-870 ℃, and the coiling temperature is 635-700 ℃;
the acid plating continuous production line comprises pickling, leveling, galvanizing, finishing, passivating and coiling to form a hot galvanizing coil;
the pickling process has the following requirements: acid tank HCL content: 40-70g/L, acid washing temperature: 70-85 ℃;
the leveling process has the leveling elongation rate of 0.8-1.2% in the front of the furnace and the leveling elongation rate of 0.8-1.3% in the back of the furnace;
the heating adopts an induction heating furnace: the soaking section of the radiant tube is 510 ℃, the spraying air cooling section is 490 ℃, and the plate temperature is 500-520 ℃;
in the galvanizing process, the aluminum content of the zinc liquid component in the zinc pot is 0.23% +/-0.03? The temperature of the strip steel entering a zinc pot is more than or equal to 490 ℃, and the temperature of zinc liquid in the zinc pot is more than or equal to 462 ℃;
the finishing process is performed (1.3% -3.0%) +/-0.2%.
2. The hot-dip galvanized sheet having no spangle 700g and an ultra-thick zinc layer as claimed in claim 1, and the production method thereof, wherein: the galvanized sheet is a double-sided equal-thickness galvanized or differential-thickness galvanized sheet with the thickness of 1.5mm-2.5mm, and the weight of the coating is 700g/m2。
3. The hot-dip galvanized sheet having no spangle 700g and an ultra-thick zinc layer as claimed in claim 1, and the production method thereof, wherein: the galvanizing process has the pressure of an upper air knife and a lower air knife of 40mbar-60mbar, the height of the air knife from zinc liquid of 140mm-200mm, the distance of the air knife from strip steel of 15mm-30mm and the angle of the air knife of-25 degrees to-15 degrees.
4. The hot-dip galvanized sheet having no spangle 700g and an ultra-thick zinc layer as claimed in claim 1, and the production method thereof, wherein: the dew point of the induction heating furnace is as follows: below-45 ℃.
5. The hot-dip galvanized sheet having no spangle 700g and an ultra-thick zinc layer as claimed in claim 1, and the production method thereof, wherein: the smelting components of the hot rolled steel strip are as follows: 0.04102% of C, 0.03998% of Si, 0.08422% of Mn, 0.01849% of P, 0.00024% of S, Fe: and (4) the balance.
6. The hot-dip galvanized sheet having no spangle 700g and an ultra-thick zinc layer as claimed in claim 1, and the production method thereof, wherein: the smelting components of the hot rolled steel strip are as follows: 0.03698% of C, 0.03678% of Si, 0.08791% of Mn, 0.01534% of P, 0.00285% of S, Fe: and (4) the balance.
7. The hot-dip galvanized sheet having no spangle 700g and an ultra-thick zinc layer as claimed in claim 1, and the production method thereof, wherein: the smelting components of the hot rolled steel strip are as follows: 0.04675% of C, 0.04117% of Si, 0.07456% of Mn, 0.01238% of P, 0.00158% of S, Fe: and (4) the balance.
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| CN201910817134.5A CN110923567A (en) | 2019-08-30 | 2019-08-30 | Zinc-flower-free 700g super-thick zinc layer hot-dip galvanized sheet and production method thereof |
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| CN112143995A (en) * | 2020-08-24 | 2020-12-29 | 河钢股份有限公司承德分公司 | Super-thick non-flower galvanized sheet and production method thereof |
| CN112195401A (en) * | 2020-09-25 | 2021-01-08 | 河钢股份有限公司承德分公司 | Production method of super-thick zinc layer hot-dip galvanized steel coil |
| CN112195429A (en) * | 2020-09-25 | 2021-01-08 | 河钢股份有限公司承德分公司 | Zinc-free flower 900g/m2Production method of double-sided super-thick zinc layer galvanized plate |
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| CN112143995A (en) * | 2020-08-24 | 2020-12-29 | 河钢股份有限公司承德分公司 | Super-thick non-flower galvanized sheet and production method thereof |
| CN112143995B (en) * | 2020-08-24 | 2022-08-30 | 河钢股份有限公司承德分公司 | Super-thick non-flower galvanized sheet and production method thereof |
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