CN112899600A - Galvanizing method for super-thick zinc layer high-strength hot-dip galvanized strip steel - Google Patents
Galvanizing method for super-thick zinc layer high-strength hot-dip galvanized strip steel Download PDFInfo
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
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- 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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- 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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- 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
A galvanizing method for super-thick zinc layer high-strength hot-dip galvanized strip steel belongs to the technical field of hot dip plating. The substrate is galvanized after cold rolling, the galvanizing process adopts an improved Sendzimir method hot galvanizing heating furnace, and the process optimization is carried out on a furnace control unit, a zinc pot control unit, a zinc layer control unit and a post-galvanizing cooling control unit to obtain a zinc layer with the strength of more than or equal to 450MPaThe thickness is more than or equal to 600g/m2The common defects of hot galvanizing thick zinc layer products such as zinc scars, zinc flow marks, thick edges and the like of the hot galvanizing strip steel (with double surfaces) are basically eliminated, and the thickness and uniformity of the zinc layer, the mechanical property and the surface quality of the product meet the requirements.
Description
Technical Field
The invention belongs to the technical field of hot dipping, and particularly relates to a galvanizing method for super-thick zinc layer high-strength hot-dip galvanized strip steel.
Background
Hot dip galvanizing, also known as hot dip galvanizing, is a process in which molten metal reacts with an iron substrate to produce an alloy layer, thereby combining the substrate and the coating. The hot galvanizing product is widely applied to the fields of automobiles, buildings, household electrical appliances, chemical industry, machinery, petroleum, metallurgy, light industry, traffic, electric power, aviation, ocean engineering and the like due to good corrosion resistance and plasticity.
Super thick zinc layer (double-sided zinc layer weight 600 g/m)2) The high-strength hot-dip galvanized sheet is a superconventional hot-dip galvanized product, and can be used under special working conditions of outdoor solar photovoltaic supports, cable bridges, underground corrugated pipe galleries, strip steel bins and the like due to the advantages of good deformation resistance, super-strong corrosion resistance, long service life, no need of maintenance and the like. For producing cold-rolled hot-dip galvanized strip steel, the defects of zinc scars, zinc flow marks, edge thick edges and the like on the surface of a product are more easily caused along with higher strength and thicker zinc layer, so how to optimize high-strength hot-dip galvanizing of an ultra-thick zinc layerThe galvanizing method of the zinc plate improves the surface quality of products and becomes a key technical problem in the hot galvanizing industry.
Disclosure of Invention
In order to solve the technical problem, the invention provides a galvanizing method for super-thick zinc layer high-strength hot-dip galvanized strip steel. The invention adopts the following technical scheme:
a galvanizing method for high-strength hot-dip galvanized strip steel with an ultra-thick zinc layer comprises the steps of galvanizing a substrate after a cold rolling process, and carrying out process optimization on a hot galvanizing furnace control unit, a zinc pot control unit, a zinc layer control unit and a cooling control unit to obtain a strip steel with the strength of more than or equal to 450MPa and the thickness of a double-sided zinc layer of more than or equal to 600g/m2The high-strength hot-dip galvanized strip steel;
in the cold rolling procedure, the reduction is 15-25%;
the hot galvanizing furnace control unit adopts an improved Sendzimir method hot galvanizing heating furnace, and the proportional coefficient of air and fuel gas in the preheating section and the direct combustion section of the heating furnace is 0.95-0.98; putting the substrate into a zinc pot at 425-440 ℃;
the zinc pot control unit controls the temperature of zinc liquid to be 445-455 ℃;
the zinc layer control unit is characterized in that the upper and lower knife lips of the air knife are respectively provided with 9 groups of bilaterally symmetrical lip seam opening degree control points, wherein the distance between two No. 1 lip seam opening degree control points is 110mm, the distance between each point of No. 1-8 lip seam opening degree control points is 110mm, the distance between the No. 9 lip seam opening degree control point and the No. 8 lip seam opening degree control point is 70mm, and the No. 1-9 lip seam opening degrees are sequentially 1.1mm, 1.15mm, 1.25mm, 1.35mm, 1.4mm, 1.45mm and 1.45 mm; the height of the air knife from the strip steel is 46-49 mm, and the height of the air knife from the zinc liquid level is 55-65 mm;
the cooling control unit is used for putting a mobile air cooling device into the zinc pot to accelerate the cooling speed of the strip steel, the height of the mobile air cooling device is 2200-2700 mm, and the power is 30-40 Hz; after the cooling tower is plated, the power of a cooling fan is 35-50 Hz, and the temperature of a tower top plate of the cooling tower is 205-215 ℃.
The temperature of the substrate, which is taken out of the direct combustion section of the heating furnace, of the hot galvanizing furnace control unit is 550-560 ℃, the temperature of the substrate, which is taken out of the radiant tube heating section, of the hot galvanizing furnace control unit is 650-690 ℃, and the temperature of the substrate, which is taken out of the soaking section, of the hot galvanizing furnace control unit is 650-690 ℃; the running speed of the substrate is 32-38 m/min.
The zinc pot control unit contains less than 0.01 wt% of Fe, 0.18-0.23 wt% of Al and 0.07-0.075 wt% of Sb in zinc liquid.
The zinc layer control unit and the air knife are compressed air, the total length of the knife lip of the air knife is 1900mm, the upper air knife and the lower air knife are synchronously controlled, the angle is controlled to be-3.2 degrees to-3.4 degrees, and the air pressure of the air knife is 42-48 mbar.
The substrate comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.15 percent of Si, less than or equal to 1.4 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, more than or equal to 0.02 percent of Als, and the balance of iron and inevitable impurities; the mechanical properties are as follows: the yield strength is more than or equal to 235MPa, the tensile strength is more than or equal to 370MPa, and the elongation after fracture is more than or equal to 26 percent.
The thickness of the hot-dip galvanized steel strip is 2.5-3.0mm, and the width is 1190-1360 mm; the yield strength is 470-530 MPa, the tensile strength is 570-620 MPa, and the elongation A80mm after fracture is more than or equal to 18%.
For a production line for carrying out hot galvanizing by adopting an improved sendzimir method heating furnace, along with the increase of the thickness of a product, the heating capacity of the heating furnace can not meet the requirement of high-speed operation of the production line, so that the weight of a double-sided zinc layer is 600g/m2The production of the high-strength galvanized product with the ultra-thick zinc layer is hindered. According to the invention, the core heat energy of thick strip steel is reduced by reducing the temperature of the strip steel entering the zinc pot and the temperature of zinc liquid, and meanwhile, the cooling speed of the strip steel exiting the zinc pot is accelerated by putting the strip steel into a mobile air cooling device; the Al content in the zinc liquid is reduced, the fluidity of the zinc liquid is reduced, and the defects of zinc scars and zinc flow marks formed by local accumulation and solidification due to over-strong flowing capability of the liquid zinc in the process of cooling the strip steel out of a zinc pot are avoided; the air knife height is reduced, meanwhile, the space between the knife lips of the air knife is adjusted in a segmented mode, the space between the knife lips at the edge of the strip steel is increased, so that the gas injection amount at the edge is increased, and the generation of thick edge defects is reduced.
Adopt above-mentioned technical scheme's beneficial effect to lie in: the production cost is not additionally increased on the basis of the existing equipment, the hot-rolled low-strength strip steel is used for continuously and stably producing the high-strength zinc-rich alloy steel with the thickness of 2.5-3.0mm, the width of 1190-1360mm, the strength of more than or equal to 450MPa and the thickness of a zinc layer of more than or equal to 600g/m through the optimized process control2High-strength hot-dip galvanized steel strip with zinc scar and zinc flowThe common defects of hot-dip galvanized thick zinc layer products such as lines, thick edges and the like are basically eliminated, and the thickness and uniformity of the zinc layer, the mechanical property and the surface quality of the product meet the requirements.
Drawings
FIG. 1 is a schematic view of a lip slit opening degree control point of an air knife blade according to the present invention.
Detailed Description
Examples 1 to 9
The grade of the hot-rolled strip steel substrate selected in the embodiment is Q235, the yield strength is more than or equal to 235MPa, the tensile strength is more than or equal to 370MPa, the elongation after fracture is more than or equal to 26%, and the steel substrate comprises the following chemical components in percentage by mass: less than or equal to 0.20 percent of C, less than or equal to 0.15 percent of Si, less than or equal to 1.4 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, more than or equal to 0.02 percent of Als, and the balance of iron and inevitable impurities. The thickness, mechanical properties and chemical composition are shown in Table 1.
The hot-rolled raw material coil is processed in a cold-rolling small-reduction mode, the reduction is 15-25%, hot galvanizing is carried out, and process optimization is carried out on a hot galvanizing furnace control unit, a zinc pot control unit, a zinc layer control unit and a cooling control unit, wherein the specific process control is as follows:
(1) a hot galvanizing furnace control unit: an improved Sendzimir method hot galvanizing heating furnace is adopted, and the proportional coefficient of air and fuel gas in a preheating section and a direct-fired section of the heating furnace is 0.95-0.98; the temperature of the substrate discharged from the direct combustion section of the heating furnace is 550-560 ℃, the temperature of the substrate discharged from the heating section of the radiant tube is 650-690 ℃, and the temperature of the substrate discharged from the soaking section is 650-690 ℃; the running speed of the substrate is 32-38 m/min; putting the substrate into a zinc pot at 425-440 ℃;
(2) zinc pot control unit: the temperature of the zinc liquid is 445-455 ℃, the content of Fe in the zinc liquid is less than 0.01 wt%, the content of Al is 0.18-0.23 wt%, and the content of Sb is 0.07-0.075 wt%;
(3) zinc layer control unit: the energy medium of the air knife is compressed air, the total length of the knife lip of the air knife is 1900mm, as shown in figure 1, the upper knife lip and the lower knife lip of the air knife are respectively provided with 9 groups of bilaterally symmetrical lip seam opening degree control points, wherein the distance between two No. 1 lip seam opening degree control points is 110mm, the distance between each point of the No. 1 lip seam opening degree control point and each point of the No. 8 lip seam opening degree control point is 110mm, the distance between the No. 9 lip seam opening degree control point and the No. 8 lip seam opening degree control point is 70mm, and the No. 1-9 lip seam opening degrees are sequentially 1.1mm, 1.15mm, 1.25mm, 1.35mm, 1.4mm, 1.45mm and 1.45 mm; synchronously controlling an upper air knife and a lower air knife, ensuring that the angle is controlled to be-3.2 degrees to-3.4 degrees, and controlling the air pressure of the air knives to be 42-48 mbar; the height of the air knife from the strip steel is 46-49 mm, and the height of the air knife from the zinc liquid level is 55-65 mm;
(4) a cooling control unit: a mobile air cooling device is put into the zinc pot to accelerate the cooling speed of the strip steel, the height of the mobile air cooling device is 2200-2700 mm, and the power is 30-40 Hz; after the cooling tower is plated, the power of a cooling fan is 35-50 Hz, and the temperature of a tower top plate of the cooling tower is 205-215 ℃.
The hot-dip galvanized steel strip obtained by the method has the thickness of 2.5-3.0mm, the width of 1190-1360mm and the thickness of a double-sided zinc layer of more than or equal to 600g/m2. According to the inspection and judgment standards of the hot galvanizing industry products, the strip steel in the embodiment is subjected to tensile test and zinc layer stripping test detection, the standard requirements are met, and the surface quality of the strip steel is good. The yield strength of the hot-dip galvanized steel strip is 470-530 MPa, the tensile strength is 570-620 MPa, and the elongation A80mm after fracture is more than or equal to 18%.
The specification, the thickness of the double-sided zinc layer and the mechanical property of the hot-dip galvanized steel strip obtained in each example are shown in a table 4; the results of the zinc layer peel test are shown in Table 5.
TABLE 1 thickness, mechanical properties and chemical composition of the hot rolled Q235 strip steel substrates of the examples
TABLE 2 parameters of the control unit of the cold rolling and hot galvanizing furnace and the control unit of the zinc pot in each example
TABLE 3 Zinc layer control Unit and Cooling control Unit parameters of examples
Table 4 shows the specification, the thickness and the mechanical property of the double-sided zinc layer of the hot-dip galvanized steel strip in each embodiment
TABLE 5 test results of zinc layer peeling test of hot-dip galvanized steel strips of each example
Claims (7)
1. A zinc plating method for a super-thick zinc layer high-strength hot-dip galvanized strip steel is characterized in that a substrate is galvanized after a cold rolling process, and a hot-dip galvanizing furnace control unit, a zinc pot control unit, a zinc layer control unit and a cooling control unit are subjected to process optimization to obtain a strip steel with the strength of more than or equal to 450MPa and the thickness of a double-sided zinc layer of more than or equal to 600g/m2The high-strength hot-dip galvanized strip steel;
in the cold rolling procedure, the reduction is 15-25%;
the hot galvanizing furnace control unit adopts an improved Sendzimir method hot galvanizing heating furnace, and the proportional coefficient of air and fuel gas in the preheating section and the direct combustion section of the heating furnace is 0.95-0.98; putting the substrate into a zinc pot at 425-440 ℃;
the zinc pot control unit controls the temperature of zinc liquid to be 445-455 ℃;
the zinc layer control unit is characterized in that the upper and lower knife lips of the air knife are respectively provided with 9 groups of bilaterally symmetrical lip seam opening degree control points, wherein the distance between two No. 1 lip seam opening degree control points is 110mm, the distance between each point of No. 1-8 lip seam opening degree control points is 110mm, the distance between the No. 9 lip seam opening degree control point and the No. 8 lip seam opening degree control point is 70mm, and the No. 1-9 lip seam opening degrees are sequentially 1.1mm, 1.15mm, 1.25mm, 1.35mm, 1.4mm, 1.45mm and 1.45 mm; the height of the air knife from the strip steel is 46-49 mm, and the height of the air knife from the zinc liquid level is 55-65 mm;
the cooling control unit is used for putting a mobile air cooling device into the zinc pot to accelerate the cooling speed of the strip steel, the height of the mobile air cooling device is 2200-2700 mm, and the power is 30-40 Hz; after the cooling tower is plated, the power of a cooling fan is 35-50 Hz, and the temperature of a tower top plate of the cooling tower is 205-215 ℃.
2. The galvanizing method for the ultra-thick zinc layer high-strength hot-dip galvanized strip steel according to claim 1, characterized in that the temperature of a direct-fired section of the substrate out of the heating furnace is 550-560 ℃, the temperature of a direct-fired section of the substrate out of the radiant tube heating section is 650-690 ℃, and the temperature of a uniform section of the substrate out of the radiant tube heating section is 650-690 ℃; the running speed of the substrate is 32-38 m/min.
3. The method for galvanizing a super-thick zinc layer high-strength hot-dip galvanized strip steel according to claim 2, wherein the zinc pot control unit contains a zinc bath composition with Fe content of less than 0.01 wt%, Al content of 0.18-0.23 wt%, and Sb content of 0.07-0.075 wt%.
4. The galvanizing method for the ultra-thick zinc layer high-strength hot-dip galvanized strip steel according to claim 3, characterized in that an energy medium of the air knife of the zinc layer control unit is compressed air, the total length of a knife lip of the air knife is 1900mm, the upper air knife and the lower air knife are synchronously controlled, the angle is controlled to be-3.2 degrees to-3.4 degrees, and the air pressure of the air knife is 42-48 mbar.
5. The galvanizing method for the ultra-thick zinc layer high-strength hot-dip galvanized strip steel according to claim 4, characterized in that the chemical components and the mass percentages of the chemical components of the base plate are as follows: less than or equal to 0.20 percent of C, less than or equal to 0.15 percent of Si, less than or equal to 1.4 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, more than or equal to 0.02 percent of Als, and the balance of iron and inevitable impurities; the mechanical properties are as follows: the yield strength is more than or equal to 235MPa, the tensile strength is more than or equal to 370MPa, and the elongation after fracture is more than or equal to 26 percent.
6. The method for galvanizing a high-strength hot-dip galvanized steel strip with an ultra-thick zinc layer according to any one of claims 1 to 5, wherein the hot-dip galvanized steel strip has a thickness of 2.5 to 3.0mm and a width of 1190 to 1360 mm.
7. The galvanizing method for the ultra-thick zinc layer high-strength hot-dip galvanized strip steel according to any one of claim 6, wherein the yield strength of the hot-dip galvanized strip steel is 470-530 MPa, the tensile strength is 570-620 MPa, and the elongation A80mm after fracture is more than or equal to 18%.
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| CN114107866A (en) * | 2021-11-30 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Production method for eliminating surface black spot defect of thick-specification thick-coating coated steel plate and thick-specification thick-coating coated steel plate |
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| CN113755773A (en) * | 2021-08-12 | 2021-12-07 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick zinc-aluminum-magnesium strip steel with thick coating |
| CN113755773B (en) * | 2021-08-12 | 2023-08-25 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick-specification thick-coating zinc-aluminum-magnesium strip steel |
| CN114107866A (en) * | 2021-11-30 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Production method for eliminating surface black spot defect of thick-specification thick-coating coated steel plate and thick-specification thick-coating coated steel plate |
| CN114107866B (en) * | 2021-11-30 | 2023-08-29 | 马鞍山钢铁股份有限公司 | Production method for eliminating black spot defect on surface of thick-gauge thick-coating coated steel plate and thick-gauge thick-coating coated steel plate |
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Application publication date: 20210604 |