CN112143978A - Method for manufacturing ultra-low carbon hot-dip galvanized steel sheet - Google Patents
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- CN112143978A CN112143978A CN202011033889.5A CN202011033889A CN112143978A CN 112143978 A CN112143978 A CN 112143978A CN 202011033889 A CN202011033889 A CN 202011033889A CN 112143978 A CN112143978 A CN 112143978A
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D8/0273—Final recrystallisation annealing
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
Abstract
The invention relates to a manufacturing method of an ultra-low carbon hot-dip galvanized steel sheet, belonging to the technical field of ferrous metallurgy production. The invention provides a method for manufacturing an ultra-low carbon hot-dip galvanized steel sheet, which comprises the following steps: smelting molten steel, continuously casting into a steel billet, roughly rolling, finely rolling, cooling, coiling, cold rolling and continuously annealing to obtain a substrate; then putting the substrate into a zinc pot for galvanizing, finishing and straightening to obtain the finished product; wherein the start rolling temperature of finish rolling is 1020-1070 ℃, and the finish rolling temperature is 920-950 ℃; the soaking temperature of the continuous annealing is 830-855 ℃, and the soaking time is 40-70 s; the finishing elongation is controlled to be 0.5-0.6%, and the withdrawal and straightening elongation is controlled to be 0.1-0.3%. The popularization and the application of the manufacturing method are beneficial to reducing the production energy consumption of the ultra-low carbon hot-dip galvanized steel sheet and saving the production cost.
Description
Technical Field
The invention relates to a manufacturing method of an ultra-low carbon hot-dip galvanized steel sheet, belonging to the technical field of ferrous metallurgy production.
Background
With the increasing use of galvanized steel sheets for automobiles and home appliances in the market, there is an urgent need to improve the mechanical properties and formability of galvanized steel sheets. For example, CN201810936061.7 discloses a hot-dip galvanized steel sheet and a manufacturing method thereof, wherein the yield strength of a finished product is 120-160 MPa, the tensile strength is 280-300 MPa, the elongation is 47.5-48.5%, and n is90A value of 0.23 to 0.24, r90The value is 2.8 to 3.0. In order to ensure that the hot-dip galvanized steel sheet has the good performances, the manufacturing method needs to maintain higher finish rolling temperature (1100-1250 ℃) and longer annealing soaking time (120-240 seconds), and the energy consumption and the cost are not reduced and controlled in the production process. In addition, there is a real need to further increase n90And r90The value requirement.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Accordingly, an object of the present invention is to provide a method for producing an ultra-low carbon hot-dip galvanized steel sheet. Another object of the present invention is to provide an ultra-low carbon hot-dip galvanized steel sheet obtained by the above production method.
The invention provides a method for manufacturing an ultra-low carbon hot-dip galvanized steel sheet, which comprises the following chemical components in percentage by mass: c: less than or equal to 0.004%, Si: less than or equal to 0.02 percent, Mn: less than or equal to 0.10 percent, P: less than or equal to 0.010 percent, S: less than or equal to 0.012 percent, Ti: 0.055-0.085%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
the manufacturing method comprises the following steps: smelting molten steel, continuously casting into a steel billet, roughly rolling, finely rolling, cooling, coiling, cold rolling and continuously annealing to obtain a substrate; then putting the substrate into a zinc pot for galvanizing, finishing and straightening to obtain the finished product;
wherein the start rolling temperature of finish rolling is 1020-1070 ℃, and the finish rolling temperature is 920-950 ℃; the soaking temperature of the continuous annealing is 830-855 ℃, and the soaking time is 40-70 s; the finishing elongation is controlled to be 0.5-0.6%, and the withdrawal and straightening elongation is controlled to be 0.1-0.3%.
Further, the chemical components of the substrate are as follows by mass percent: c: 0.0028 to 0.0029%, Si: 0.003%, Mn: 0.05-0.06%, P: 0.006-0.007%, S: 0.007-0.008%, Als: 0.029-0.031%, Ti: 0.066-0.068%, and the balance of Fe and inevitable impurities.
Further, the rough rolling satisfies at least one of the following conditions:
heating to 1220-1250 ℃, keeping the furnace for 200-300 min, and carrying out rough rolling;
5-pass rolling is adopted for rough rolling, and 5-pass total phosphorus removal is carried out;
the thickness of the intermediate plate blank obtained after rough rolling is 38-45 mm.
Furthermore, the initial rolling temperature of the finish rolling is 1044-1050 ℃, and the final rolling temperature is 936-938 ℃.
The thickness of the obtained hot-rolled plate is 3-6 mm.
Further, the cooling satisfies at least one of the following:
cooling in a laminar cooling mode;
cooling to 710-750 ℃ and coiling.
Further, the cold rolling reduction is 78-84%.
Preferably, the cold rolling reduction is 80%.
Furthermore, the soaking temperature of the continuous annealing is 838-840 ℃, and the soaking time is 65-66 s.
Furthermore, the temperature of the substrate in the zinc pot is 450-470 ℃.
Furthermore, the finishing elongation is controlled to be 0.55-0.56%, and the withdrawal and straightening elongation is controlled to be 0.1-0.2%.
The invention provides an ultra-low carbon hot-dip galvanized steel sheet obtained by the manufacturing method.
The invention provides a method for manufacturing an ultra-low carbon hot-dip galvanized steel sheet. Through reasonable chemical component design and process parameter optimization, particularly by controlling the finishing elongation and the straightening elongation, the hot-dip galvanized steel plate manufactured by the method has good mechanical property and formability, and the finished product can reach the yield strength of 100-150 MPa, tensile strength 270-310 MPa, elongation not less than 44.0%, r90≥2.9，n90Not less than 0.23, especially n90The value is obviously improved and can reach the levels of 3.3 and 3.4. Meanwhile, the manufacturing method disclosed by the invention is suitable for lower finish rolling temperature and shorter annealing soaking time, and is beneficial to reducing production energy consumption and saving production cost.
Detailed Description
The invention provides a method for manufacturing an ultra-low carbon hot-dip galvanized steel sheet, which comprises the following chemical components in percentage by mass: c: less than or equal to 0.004%, Si: less than or equal to 0.02 percent, Mn: less than or equal to 0.10 percent, P: less than or equal to 0.010 percent, S: less than or equal to 0.012 percent, Ti: 0.055-0.085%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
the manufacturing method comprises the following steps: smelting molten steel, continuously casting into a steel billet, roughly rolling, finely rolling, cooling, coiling, cold rolling and continuously annealing to obtain a substrate; then putting the substrate into a zinc pot for galvanizing, finishing and straightening to obtain the finished product;
wherein the start rolling temperature of finish rolling is 1020-1070 ℃, and the finish rolling temperature is 920-950 ℃; the soaking temperature of the continuous annealing is 830-855 ℃, and the soaking time is 40-70 s; the finishing elongation is controlled to be 0.5-0.6%, and the withdrawal and straightening elongation is controlled to be 0.1-0.3%.
The hot dip galvanized steel sheet has higher r through reasonable chemical component design and process parameter optimization, particularly controlling the finishing elongation and the straightening elongation90And n90Value, especially n90The value can reach high level of 3.3 and 3.4. Meanwhile, the method is beneficial to reducing the finish rolling temperature, shortening the annealing soaking time and saving the production cost.
The reason for selecting the chemical components and the ranges thereof in the invention is as follows:
the selection of the carbon content range mainly considers the matching of strength, formability and welding performance, and is controlled within the range of less than or equal to 0.004 percent.
Silicon: si can be dissolved in ferrite and austenite to improve the strength of the steel, the action is second to C, P, Si can also inhibit the precipitation of carbide in ferrite, and solid solution C atoms are fully enriched in austenite, thereby improving the stability of the steel. However, when the content of Si is too high, the surface iron scale formed in the heating furnace by Si is difficult to remove, and the dephosphorization difficulty is increased. Therefore, the Si content of the present invention is less than 0.02%.
Mn is mainly in a solid solution strengthening mode to improve the strength and is combined with sulfur to form MnS, thereby preventing hot cracking caused by FeS, and the welding performance of steel is influenced due to the excessively high Mn content. Therefore, the Mn content is controlled to be less than or equal to 0.10 percent.
S exists as a residual element and is controlled to be less than or equal to 0.012 percent.
Aluminum is mainly added as a deoxidizing element, the content of the aluminum is required to be more than 0.010 percent to realize complete deoxidation, but the excessive aluminum influences the welding performance of steel and the control of casting blank inclusions, so the content of the aluminum is preferably selected to be 0.020 to 0.070 percent.
The microalloy Ti is added to combine with C, N element to form Ti (C, N), and clearance atoms are removed to obtain a pure ferrite matrix. The Ti content is low, interstitial atoms cannot be completely removed, the strength can be obviously improved due to the excessively high Ti content, the service performance is influenced, and the punched part can be seriously cracked. Therefore, the Ti content is preferably 0.055% to 0.085%.
The scheme of the invention will be explained with reference to the examples. It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
Examples and comparative examples
(1) The chemical components of the continuous casting billet which is prepared by the steps of common molten iron desulphurization, converter smelting, LF furnace Ca treatment, RH decarburization and continuous casting are shown in the table 1, and the balance is Fe and inevitable impurities.
Table 1 billet chemistry (wt.%)
| Numbering | C | Si | Mn | P | S | Als | Ti |
| Example 1 | 0.0029 | 0.003 | 0.05 | 0.006 | 0.008 | 0.031 | 0.066 |
| Example 2 | 0.0028 | 0.003 | 0.06 | 0.007 | 0.007 | 0.029 | 0.068 |
| Comparative example 1 | 0.0031 | 0.003 | 0.07 | 0.008 | 0.009 | 0.029 | 0.072 |
| Comparative example 2 | 0.0026 | 0.004 | 0.06 | 0.007 | 0.009 | 0.032 | 0.070 |
(2) The main process parameters of hot rolling are shown in table 2. The furnace time is 260min, the rough rolling adopts 5-pass rolling, the phosphorus is completely removed in 5 passes, and the thickness of the intermediate plate blank after the rough rolling is 43 mm. After hot rolling, the steel sheet was cooled by laminar cooling and wound.
TABLE 2 Hot Rolling Main Process parameters
(3) And (4) pickling the hot-rolled coil, and cold-rolling the hot-rolled coil into thin strip steel, wherein the cold rolling reduction rate is 80%.
(4) After a cleaning procedure, removing residual oil, iron scale, iron powder and the like on the surface of the strip steel, feeding the strip steel into a continuous annealing furnace, and putting the obtained substrate into a zinc pot for galvanizing. Then blowing by an air knife, cooling, finishing, straightening, then carrying out surface passivation treatment and coiling. The main process parameters of continuous annealing, galvanizing, finishing and straightening and withdrawal are shown in table 3.
TABLE 3 main process parameters of annealing, hot galvanizing, etc
(5) The mechanical properties of the hot-dip galvanized steel sheet prepared by the process are shown in the following table 4:
TABLE 4 mechanical Properties of hot-dip galvanized steel sheets
| Numbering | Thickness/mm | Rp0.2/MPa | Rm/MPa | Elongation A80/％ | r90 | n90 |
| Example 1 | 1.0 | 135 | 292 | 46.5 | 0.26 | 3.4 |
| Example 2 | 1.0 | 141 | 300 | 47.0 | 0.26 | 3.3 |
| Comparative example 1 | 1.0 | 164 | 288 | 43.5 | 0.24 | 2.9 |
| Comparative example 2 | 1.0 | 159 | 296 | 44.0 | 0.24 | 2.9 |
As can be seen from examples 1 and 2, the hot dip galvanized steel sheet of the invention has a high r by controlling the temper elongation to be in the range of 0.5 to 0.6% and the withdrawal elongation to be in the range of 0.1 to 0.3%90And n90Value, especially n90The value can reach high level of 3.3 and 3.4. Meanwhile, the method is beneficial to reducing the finish rolling temperature, shortening the annealing soaking time and saving the production cost.
As can be seen by comparing examples 1 and 2 with comparative examples 1 and 2, r of the hot-dip galvanized steel sheet in comparative examples 1 and 2 is not properly controlled in the temper elongation90And n90The values are significantly reduced compared to examples 1 and 2.
It should be appreciated that the particular features, structures, materials, or characteristics described in this specification may be combined in any suitable manner in any one or more embodiments. Furthermore, the various embodiments and features of the various embodiments described in this specification can be combined and combined by one skilled in the art without contradiction.
Claims (10)
1. A method for producing an ultra-low carbon hot-dip galvanized steel sheet, characterized by comprising: the chemical components of the substrate are as follows by mass percent: c: less than or equal to 0.004%, Si: less than or equal to 0.02 percent, Mn: less than or equal to 0.10 percent, P: less than or equal to 0.010 percent, S: less than or equal to 0.012 percent, Ti: 0.055-0.085%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
the manufacturing method comprises the following steps: smelting molten steel, continuously casting into a steel billet, roughly rolling, finely rolling, cooling, coiling, cold rolling and continuously annealing to obtain a substrate; then putting the substrate into a zinc pot for galvanizing, finishing and straightening to obtain the finished product;
wherein the start rolling temperature of finish rolling is 1020-1070 ℃, and the finish rolling temperature is 920-950 ℃; the soaking temperature of the continuous annealing is 830-855 ℃, and the soaking time is 40-70 s; the finishing elongation is controlled to be 0.5-0.6%, and the withdrawal and straightening elongation is controlled to be 0.1-0.3%.
2. The manufacturing method according to claim 1, wherein: the chemical components of the substrate are as follows by mass percent: c: 0.0028 to 0.0029%, Si: 0.003%, Mn: 0.05-0.06%, P: 0.006-0.007%, S: 0.007-0.008%, Als: 0.029-0.031%, Ti: 0.066-0.068%, and the balance of Fe and inevitable impurities.
3. The manufacturing method according to claim 1, wherein: the rough rolling meets at least one of the following conditions:
heating to 1220-1250 ℃, keeping the furnace for 200-300 min, and carrying out rough rolling;
5-pass rolling is adopted for rough rolling, and 5-pass total phosphorus removal is carried out;
the thickness of the intermediate plate blank obtained after rough rolling is 38-45 mm.
4. The manufacturing method according to claim 1, wherein: the initial rolling temperature of finish rolling is 1044-1050 ℃, and the final rolling temperature is 936-938 ℃.
5. The manufacturing method according to claim 1, wherein: the cooling satisfies at least one of the following conditions:
cooling in a laminar cooling mode;
cooling to 710-750 ℃ and coiling.
6. The manufacturing method according to claim 1, wherein: the cold rolling reduction rate is 78-84%; preferably, the cold rolling reduction is 80%.
7. The manufacturing method according to claim 1, wherein: the soaking temperature of the continuous annealing is 838-840 ℃, and the soaking time is 65-66 s.
8. The manufacturing method according to claim 1, wherein: the temperature of the substrate in the zinc pot is 450-470 ℃.
9. The manufacturing method according to claim 1, wherein: the finishing elongation is controlled to be 0.55-0.56%, and the withdrawal and straightening elongation is controlled to be 0.1-0.2%.
10. An ultra-low carbon hot-dip galvanized steel sheet obtained by the production method according to any one of claims 1 to 9.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115386806A (en) * | 2022-09-13 | 2022-11-25 | 攀钢集团研究院有限公司 | Production method of hot-dip galvanized steel sheet suitable for high-speed continuous stamping and hot-dip galvanized steel sheet |
| CN115652221A (en) * | 2022-11-08 | 2023-01-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of hot-dip galvanized steel plate for household appliances |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115386806A (en) * | 2022-09-13 | 2022-11-25 | 攀钢集团研究院有限公司 | Production method of hot-dip galvanized steel sheet suitable for high-speed continuous stamping and hot-dip galvanized steel sheet |
| CN115652221A (en) * | 2022-11-08 | 2023-01-31 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of hot-dip galvanized steel plate for household appliances |
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