CN107513668B - Hot-dip galvanized sheet and processing method thereof - Google Patents
Hot-dip galvanized sheet and processing method thereof Download PDFInfo
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- CN107513668B CN107513668B CN201710598049.5A CN201710598049A CN107513668B CN 107513668 B CN107513668 B CN 107513668B CN 201710598049 A CN201710598049 A CN 201710598049A CN 107513668 B CN107513668 B CN 107513668B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- 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
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Abstract
The invention relates to the technical field of steel plate smelting, in particular to a hot-galvanized plate and a processing method thereof, wherein the hot-galvanized plate comprises the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08%, boron less than 0.0015%, and nitrogen less than 0.0040%. The hot-dip galvanized sheet can be applied to the preparation and processing of the shell of a washing machine with the washing capacity of more than ten kilograms, has the characteristics of high strength, high formability and no aging, and is low in production and processing cost. The yield strength of the hot-dip galvanized sheet is 250-320MPa, the tensile strength is 370-460MPa, and the elongation percentage A after fracture80mmGreater than or equal to 30%.
Description
Technical Field
The invention relates to the technical field of steel plate smelting, in particular to a hot-dip galvanized plate and a processing method thereof.
Background
The shell of the washing machine has very strict requirements on steel, and the steel plate has certain strength, forming performance and ageing resistance. The shell of the existing washing machine is generally made of hot galvanized plates through color coating. The color coating process is equivalent to artificial aging, the shell of the washing machine has larger radian at the upright post, and if the aging resistance is poor, the defect of tensile strain marks is easy to appear at the upright post of the washing machine, so that the hot-dip galvanized sheet for processing the shell of the washing machine is required to have high aging resistance. In addition, the drum of the washing machine needs to bear force and rotate at high speed, and the drum needs to be deep-drawn, so that high strength and high formability are required for hot-galvanized plates used for processing the outer shell of the washing machine. However, in the prior art, the hot-galvanized sheet used for processing the outer case of the washing machine has technical problems of low strength and poor anti-aging property.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a hot-galvanized sheet and a processing method thereof that overcome the above problems or at least partially solve the above problems.
The embodiment of the invention provides a hot-galvanized plate, which comprises the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08%, boron less than 0.0015%, and nitrogen less than 0.0040%.
Preferably, the thickness of the hot-dip galvanized plate is 0.4-2.5 mm.
Preferably, the microstructure of the hot-dip galvanized sheet is ferrite, titanium carbide precipitated phases are dispersed in a matrix of the hot-dip galvanized sheet, the average grain size of the ferrite is 7-15 mu m, and the size of the titanium carbide precipitated phases is 8-50 nm.
Based on the same inventive concept, an embodiment of the present invention further provides a method for processing the hot-dip galvanized sheet, including:
obtaining molten iron for preparing the hot-dip galvanized sheet, wherein the molten iron comprises the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08%, less than 0.0015% of boron and less than 0.0040% of nitrogen;
continuously casting the molten iron to obtain a casting blank;
carrying out hot rolling on the casting blank to obtain a hot rolled plate;
cold rolling the hot rolled sheet to obtain a cold rolled sheet;
and annealing and galvanizing the cold-rolled sheet to obtain the hot-dip galvanized sheet.
Preferably, the hot rolling the cast slab to obtain a hot rolled plate includes:
heating the casting blank, wherein the heating temperature is 1180-1250 ℃, and the tapping temperature is 1200-1250 ℃;
carrying out multi-pass rough rolling on the heated casting blank to obtain a rough rolling plate, wherein the outlet temperature of the rough rolling is 1010-1080 ℃, and the accumulated reduction rate in the rough rolling process is 70-85%;
performing multi-pass finish rolling on the rough rolled plate to obtain a finish rolled plate, wherein the start rolling temperature of the finish rolling is 1010-1080 ℃, the finish rolling temperature is 880-960 ℃, and the accumulated reduction rate in the finish rolling process is 75-90%;
and coiling the finish rolled plate after laminar cooling to obtain the hot rolled plate, wherein the coiling temperature is 660-740 ℃.
Preferably, the heated casting blank is subjected to 4-7 times of rough rolling, and the reduction ratios of the rest times of rough rolling are greater than or equal to 15% except for the first time of rough rolling.
Preferably, the rough rolling plate is subjected to 6-8 times of finish rolling, and the reduction rate of the last finish rolling is more than or equal to 8%.
Preferably, the cumulative reduction rate is 60 to 85% in the cold rolling of the hot-rolled sheet.
Preferably, in the annealing and galvanizing process of the cold-rolled sheet, the temperature of the heating section is 770-830 ℃, the conveying speed of the cold-rolled sheet is 90-120m/min, and the finishing elongation is 0.8-1.5%.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the hot-dip galvanized sheet comprises the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08 percent of boron, less than 0.0015 percent of boron and less than 0.0040 percent of nitrogen, because the ultra-low carbon component is adopted and the titanium element is added, the carbon element is converted into titanium carbide as much as possible, the dispersed titanium carbide can improve the strength of the material and reduce the carbon atoms for solid solution at the same time so as to reduce the aging; silicon is used as a deoxidizer for removing oxygen in molten steel, and the silicon is subjected to solid solution strengthening to improve the ferrite strength; manganese is subjected to solid solution strengthening, and the ferrite strength is improved; phosphorus is subjected to solid solution strengthening, and the strength is improved; aluminum is a strong deoxidizer and can inhibit the generation of other oxides; the carbon carbide has a precipitation strengthening effect and provides strength for the steel plate, the titanium carbide particles dispersed and precipitated can inhibit the growth of crystal grains, the fine crystal grains of the steel plate are ensured, the fine crystal grains not only contribute to the strength, but also improve the elongation of the steel plate, and the steel plate is ensured to have high strength and high elongation; boron is easy to form boron nitride with nitrogen, thereby reducing solid solution nitrogen atoms and reducing the aging.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 shows a metallographic structure of a hot-galvanized sheet according to the invention;
FIG. 2 shows a transmission electron micrograph of second phase precipitates of Ti of a hot-dip galvanized sheet according to the invention;
fig. 3 shows a flow chart of the method of processing hot-galvanized sheet according to the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The application provides a hot-galvanized plate, which comprises the following chemical components in percentage by mass: carbon (C) is less than or equal to 0.0040%, and silicon (Si): 0.10-0.40%, manganese (Mn): 0.50-0.70%, phosphorus (P): 0.07-0.09%, sulfur (S) < 0.012%, all aluminum (Alt): 0.020 to 0.050%, titanium (Ti): 0.05-0.08 percent, less than 0.0015 percent of boron (B), less than 0.0040 percent of nitrogen (N), and the balance of iron and impurities.
The hot-dip galvanized sheet can be applied to the preparation and processing of the shell of a washing machine with the washing capacity of more than ten kilograms, has the characteristics of high strength, high formability and no aging, and is low in production and processing cost. The yield strength of the hot-dip galvanized sheet is 250320MPa, tensile strength of 370 and 460MPa, and elongation A after fracture80mmGreater than or equal to 30%.
In the application, the thickness of the hot dip galvanized plate is controlled to be 0.4-2.5 mm. The microstructure of the hot-dip galvanized plate is ferrite, titanium carbide (TiC) precipitated phases are dispersed in a matrix of the hot-dip galvanized plate, the average grain size of the ferrite is 7-15 mu m, and the size of the titanium carbide precipitated phases is 8-50 nm. The metallographic structure of the hot-dip galvanized sheet is shown in fig. 1, and the transmission electron micrograph of the Ti second phase precipitates of the hot-dip galvanized sheet is shown in fig. 2.
Based on the same inventive concept, the present invention also provides a method for processing the aforementioned hot-galvanized sheet, as shown in fig. 3, the method comprising the steps of:
step 301: obtaining molten iron for preparing the hot-dip galvanized sheet, wherein the molten iron comprises the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08%, boron less than 0.0015%, and nitrogen less than 0.0040%.
Step 302: and continuously casting the molten iron to obtain a casting blank.
Step 303: and carrying out hot rolling on the casting blank to obtain a hot rolled plate.
Step 304: and cold rolling the hot rolled plate to obtain a cold rolled plate.
Step 305: and annealing and galvanizing the cold-rolled sheet to obtain the hot-dip galvanized sheet.
In this application, step 303 specifically includes:
step 3031: and heating the casting blank, wherein the heating temperature is 1180-1250 ℃, and the tapping temperature is 1200-1250 ℃.
Step 3032: and carrying out multi-pass rough rolling on the heated casting blank to obtain a rough rolling plate, wherein the outlet temperature of the rough rolling is 1010-1080 ℃, and the accumulated reduction rate in the rough rolling process is 70-85%.
Step 3033: and performing multi-pass finish rolling on the rough rolled plate to obtain a finish rolled plate, wherein the start rolling temperature of the finish rolling is 1010-1080 ℃, the finish rolling temperature is 880-960 ℃, and the accumulated reduction rate in the finish rolling process is 75-90%.
Step 3034: and coiling the finish rolled plate after laminar cooling to obtain the hot rolled plate, wherein the coiling temperature is 660-740 ℃.
Preferably, in step 3032, the heated casting blank is subjected to 4 to 7 times of rough rolling, and the reduction ratios of the rest times of rough rolling are greater than or equal to 15% except for the first time of rough rolling.
Preferably, in step 3033, the rough rolled sheet is subjected to 6 to 8 finish rolling, the reduction of the last finish rolling being greater than or equal to 8%.
Preferably, the cumulative reduction during cold rolling of the hot rolled sheet is 60 to 85%. In the process of annealing and galvanizing the cold-rolled sheet, the temperature of the heating section is 770-830 ℃, the conveying speed of the cold-rolled sheet is 90-120m/min, and the finishing elongation is 0.8-1.5%.
The hot-galvanized sheet and the corresponding method of processing a hot-galvanized sheet according to the present application will be described in detail below with reference to five specific examples.
The chemical composition of the hot-galvanized sheets corresponding to the five specific examples is as follows (in wt.%):
| examples | C | Si | Mn | P | S | Alt | Ti | B | N |
| Example 1 | 0.0020 | 0.19 | 0.59 | 0.07 | 0.005 | 0.045 | 0.06 | 0.0010 | 0.0017 |
| Example 2 | 0.0031 | 0.19 | 0.6 | 0.08 | 0.006 | 0.036 | 0.06 | 0.0008 | 0.0015 |
| Example 3 | 0.0017 | 0.19 | 0.6 | 0.08 | 0.005 | 0.034 | 0.06 | 0.0009 | 0.0018 |
| Example 4 | 0.0020 | 0.2 | 0.61 | 0.08 | 0.005 | 0.043 | 0.07 | 0.0009 | 0.0020 |
| Example 5 | 0.0015 | 0.2 | 0.6 | 0.07 | 0.005 | 0.047 | 0.06 | 0.0010 | 0.0019 |
Watch 1
Example 1: the chemical composition of the hot-galvanized sheet is shown in Table 1 above, and its thickness is 0.6 mm. The method for processing the hot-dip galvanized sheet comprises the following steps:
first, molten irons having corresponding contents as in table 1 above are continuously cast to obtain a cast slab. Then, the casting blank is hot rolled, and the hot rolling process comprises the following steps:
(1) heating the casting blank, controlling the heating temperature to be 1230 ℃, and controlling the tapping temperature to be 1230 ℃.
(2) And (3) carrying out 6-pass rough rolling on the heated casting blank, controlling the outlet temperature of the rough rolling to be 1040 ℃, controlling the cumulative reduction rate of the whole rough rolling process to be 84%, and except for the first-pass rough rolling, controlling the reduction rates of the other-pass rough rolling to be more than or equal to 15%, thereby preparing the rough rolling plate.
(3) And (3) carrying out 7-pass finish rolling on the rough rolled plate, wherein the start rolling temperature of the finish rolling is 1020 ℃, the finish rolling temperature is 920 ℃, the cumulative reduction rate of the whole finish rolling process is 85%, the reduction rate of the last finish rolling is more than 8%, and the last finish rolling is carried out by adopting an F7 rack, so that the finish rolled plate is prepared.
(4) And (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 700 ℃ so as to obtain the hot-rolled plate.
After the hot rolled sheet was obtained, the hot rolled sheet was cold rolled with the cumulative reduction controlled to 85% during the cold rolling, thereby producing a cold rolled sheet. And finally, annealing and galvanizing the cold-rolled sheet, controlling the temperature of a heating section to be 820 ℃, the conveying speed of the cold-rolled sheet to be 110m/min, and the finishing elongation to be 0.9 percent, thereby preparing the hot-dip galvanized sheet.
In example 1, the finally obtained hot-dip galvanized sheet had a yield strength of 276MPa, a tensile strength of 412MPa and a post-fracture elongation A80mmThe content was found to be 31.5%.
Example 2: the chemical composition of the hot-galvanized sheet is shown in Table 1 above, and its thickness is 0.6 mm. The method for processing the hot-dip galvanized sheet comprises the following steps:
first, molten irons having corresponding contents as in table 1 above are continuously cast to obtain a cast slab. Then, the casting blank is hot rolled, and the hot rolling process comprises the following steps:
(1) heating the casting blank, controlling the heating temperature to be 1240 ℃, and controlling the tapping temperature to be 1240 ℃.
(2) And (3) carrying out 6-pass rough rolling on the heated casting blank, controlling the outlet temperature of the rough rolling to be 1050 ℃, controlling the cumulative reduction rate of the whole rough rolling process to be 83%, and except the first-pass rough rolling, controlling the reduction rates of the other-pass rough rolling to be more than or equal to 15%, thereby preparing the rough rolling plate.
(3) And (3) carrying out 7-pass finish rolling on the rough rolled plate, wherein the initial rolling temperature of the finish rolling is 1030 ℃, the final rolling temperature is 930 ℃, the cumulative reduction rate of the whole finish rolling process is 89%, the reduction rate of the last finish rolling is more than or equal to 8%, and the last finish rolling is carried out by adopting an F7 rack, so that the finish rolled plate is prepared.
(4) And (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 670 ℃ so as to obtain the hot-rolled plate.
After the hot rolled sheet was obtained, the hot rolled sheet was cold rolled with the cumulative reduction controlled to 85% during the cold rolling, thereby producing a cold rolled sheet. And finally, annealing and galvanizing the cold-rolled sheet, controlling the temperature of a heating section to be 820 ℃, the conveying speed of the cold-rolled sheet to be 110m/min, and the finishing elongation to be 0.9 percent, thereby preparing the hot-dip galvanized sheet.
In example 2, the finally obtained hot-dip galvanized sheet had a yield strength of 305MPa, a tensile strength of 429MPa and a elongation A after fracture80mmThe content was 30.5%.
Example 3: the chemical composition of the hot-galvanized sheet is shown in Table 1 above, and the thickness is 1 mm. The method for processing the hot-dip galvanized sheet comprises the following steps:
first, molten irons having corresponding contents as in table 1 above are continuously cast to obtain a cast slab. Then, the casting blank is hot rolled, and the hot rolling process comprises the following steps:
(1) heating the casting blank, controlling the heating temperature to be 1230 ℃, and controlling the tapping temperature to be 1230 ℃.
(2) And (3) carrying out 6-pass rough rolling on the heated casting blank, controlling the outlet temperature of the rough rolling to be 1040 ℃, controlling the cumulative reduction rate of the whole rough rolling process to be 84%, and except for the first-pass rough rolling, controlling the reduction rates of the other-pass rough rolling to be more than or equal to 15%, thereby preparing the rough rolling plate.
(3) And (3) carrying out 7-pass finish rolling on the rough rolled plate, wherein the initial rolling temperature of the finish rolling is 1020 ℃, the final rolling temperature is 920 ℃, the cumulative reduction rate of the whole finish rolling process is 85%, the reduction rate of the last finish rolling is more than or equal to 8%, and the last finish rolling is carried out by adopting an F7 rack, so that the finish rolled plate is prepared.
(4) And (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 700 ℃ so as to obtain the hot-rolled plate.
After the hot rolled sheet was obtained, the hot rolled sheet was cold rolled with the cumulative reduction rate controlled to 75% during the cold rolling, thereby producing a cold rolled sheet. And finally, annealing and galvanizing the cold-rolled sheet, controlling the temperature of a heating section to be 820 ℃, the conveying speed of the cold-rolled sheet to be 110m/min, and the finishing elongation to be 1%, thereby preparing the hot-dip galvanized sheet.
In example 3, the finally obtained hot-dip galvanized sheet had a yield strength of 263MPa, a tensile strength of 399MPa, and a post-fracture elongation A80mmIt was 34.5%.
Example 4: the chemical composition of the hot-galvanized sheet is shown in Table 1 above, and the thickness is 1 mm. The method for processing the hot-dip galvanized sheet comprises the following steps:
first, molten irons having corresponding contents as in table 1 above are continuously cast to obtain a cast slab. Then, the casting blank is hot rolled, and the hot rolling process comprises the following steps:
(1) heating the casting blank, controlling the heating temperature to be 1240 ℃, and controlling the tapping temperature to be 1240 ℃.
(2) And (3) carrying out 6-pass rough rolling on the heated casting blank, controlling the outlet temperature of the rough rolling to be 1050 ℃, controlling the cumulative reduction rate of the whole rough rolling process to be 84%, and except for the first-pass rough rolling, controlling the reduction rates of the other-pass rough rolling to be more than or equal to 15%, thereby preparing the rough rolling plate.
(3) And (3) carrying out 7-pass finish rolling on the rough rolled plate, wherein the initial rolling temperature of the finish rolling is 1030 ℃, the final rolling temperature is 910 ℃, the cumulative reduction rate of the whole finish rolling process is 85%, the reduction rate of the last finish rolling is more than or equal to 8%, and the last finish rolling is carried out by adopting an F7 rack, so that the finish rolled plate is prepared.
(4) And (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 700 ℃ so as to obtain the hot-rolled plate.
After the hot rolled sheet was obtained, the hot rolled sheet was cold rolled with the cumulative reduction rate controlled to 75% during the cold rolling, thereby producing a cold rolled sheet. And finally, annealing and galvanizing the cold-rolled sheet, controlling the temperature of a heating section to be 820 ℃, the conveying speed of the cold-rolled sheet to be 110m/min, and the finishing elongation to be 1%, thereby preparing the hot-dip galvanized sheet.
In example 4, the finally obtained hot-dip galvanized sheet had a yield strength of 279MPa, a tensile strength of 418MPa and a elongation A after fracture80mmIt was 34.5%.
Example 5: the chemical composition of the hot-dip galvanized sheet is shown in Table 1 above, and the thickness thereof is 0.8 mm. The method for processing the hot-dip galvanized sheet comprises the following steps:
first, molten irons having corresponding contents as in table 1 above are continuously cast to obtain a cast slab. Then, the casting blank is hot rolled, and the hot rolling process comprises the following steps:
(1) heating the casting blank, controlling the heating temperature to be 1230 ℃, and controlling the tapping temperature to be 1230 ℃.
(2) And (3) carrying out 6-pass rough rolling on the heated casting blank, controlling the outlet temperature of the rough rolling to be 1040 ℃, controlling the cumulative reduction rate of the whole rough rolling process to be 83%, and except for the first-pass rough rolling, controlling the reduction rates of the other-pass rough rolling to be more than or equal to 15%, thereby preparing the rough rolling plate.
(3) And (3) carrying out 7-pass finish rolling on the rough rolled plate, wherein the initial rolling temperature of the finish rolling is 1030 ℃, the final rolling temperature is 920 ℃, the cumulative reduction rate of the whole finish rolling process is 86%, the reduction rate of the last finish rolling is more than or equal to 8%, and the last finish rolling is carried out by adopting an F7 rack, so that the finish rolled plate is prepared.
(4) And (3) coiling the finish-rolled plate after laminar cooling, and controlling the coiling temperature to be 700 ℃ so as to obtain the hot-rolled plate.
After the hot rolled sheet was obtained, the hot rolled sheet was cold rolled while controlling the cumulative reduction at 80% during the cold rolling, thereby producing a cold rolled sheet. And finally, annealing and galvanizing the cold-rolled sheet, controlling the temperature of a heating section to be 820 ℃, the conveying speed of the cold-rolled sheet to be 110m/min, and the finishing elongation to be 0.9 percent, thereby preparing the hot-dip galvanized sheet.
In example 5, the finally obtained hot-dip galvanized sheet had a yield strength of 275MPa, a tensile strength of 417MPa and a post-fracture elongation A80mmThe content was 34%.
In the application, the C in the hot-dip galvanized sheet is less than or equal to 0.0040 percent, because the ultra-low carbon component is adopted and the Ti element is added, the C element is converted into TiC as much as possible, the TiC which is dispersed and distributed can improve the material strength and reduce the solid solution C atoms so as to reduce the aging. The Si content in the hot-dip galvanized sheet is 0.10-0.40%, the Si is used as a deoxidizer for removing oxygen in molten steel, and the Si is subjected to solid solution strengthening to improve the ferrite strength. The Mn content in the hot-dip galvanized sheet is 0.50-0.70%, and Mn is subjected to solid solution strengthening to improve the ferrite strength. P in the hot-dip galvanized sheet is 0.07-0.09%, P is one of the most important elements in the phosphorus-added high-strength steel, P is subjected to solid solution strengthening to improve the strength, P is one of the most effective elements for improving the strength, and the solid solution strengthening effect is second to C, N. S in the hot-dip galvanized sheet is less than 0.012 percent, large-size manganese sulfide is easily formed when the sulfur content is high, the plasticity of the steel sheet is obviously reduced, and hot brittleness is easily generated when the sulfur content is high, so the sulfur content is not more than 0.012 percent. The Alt in the hot-dip galvanized plate is 0.020-0.050%, aluminum is a strong deoxidizer and can inhibit the generation of other oxides, aluminum reacts with oxygen to generate aluminum oxide, the shaping of the aluminum oxide is poor, and a large amount of aluminum oxide inclusions can damage the processability of the steel plate, so a certain amount of aluminum is selected for deoxidation, and Als is selected to be 0.020-0.050%. The Ti content in the hot-dip galvanized plate is 0.05-0.08%, the Ti and the C form TiC, the TiC has a precipitation strengthening effect and provides strength for the steel plate, the TiC particles precipitated in a dispersing mode can inhibit grains from growing, the grains of the steel plate are guaranteed to be fine, the grains are fine, the elongation of the steel plate is improved besides contributing to the strength, and the steel plate is guaranteed to have high strength and high elongation. B in the hot-dip galvanized sheet is less than 0.0015%, and B is easy to form BN with N, so that solid-dissolved N atoms are reduced, and the aging is reduced. N in the hot galvanized sheet is less than 0.0040%, N is a harmful element, the content of N is controlled to be as low as possible, and a trace amount of B is used for fixing N atoms, so that the content of solid solution N atoms is as low as possible to reduce the aging, and the content of N should not exceed 0.0040%.
Compared with the existing hot-galvanized plate for the washing machine shell, the hot-galvanized plate has the following characteristics:
(1) the strength is high, the yield strength is 250-320MP, the washing machine shell with the washing capacity of ten kilograms or more can be manufactured, and the vibration resistance and the noise resistance are good when the drum of the washing machine rotates at a high speed due to the high strength.
(2) High formability, elongation after fracture A80mmThe hot-dip galvanized sheet has high strength and high elongation, and can ensure the bending and stamping of a washing machine plate.
(3) Compared with the similar phosphorus-added high-strength steel, the hot-dip galvanized plate has lower cost.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The hot-galvanized plate is characterized by comprising the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08 percent of boron, less than 0.0015 percent of boron, less than 0.0040 percent of nitrogen, and the balance of Fe and inevitable impurity elements;
the microstructure of the hot-dip galvanized sheet is ferrite, titanium carbide precipitated phases are dispersed in a matrix of the hot-dip galvanized sheet, the average grain size of the ferrite is 7-15 mu m, and the size of the titanium carbide precipitated phases is 8-50 nm;
the thickness of the hot dip galvanized plate is 0.4-2.5 mm.
2. A method of processing hot-galvanized sheet according to claim 1, characterized in that it comprises:
obtaining molten iron for preparing the hot-dip galvanized sheet, wherein the molten iron comprises the following chemical components in percentage by mass: less than or equal to 0.0040% of carbon, silicon: 0.10-0.40%, manganese: 0.50-0.70%, phosphorus: 0.07-0.09%, sulfur < 0.012%, total aluminum: 0.020-0.050%, titanium: 0.05-0.08%, less than 0.0015% of boron and less than 0.0040% of nitrogen;
continuously casting the molten iron to obtain a casting blank;
carrying out hot rolling on the casting blank to obtain a hot rolled plate;
cold rolling the hot rolled sheet to obtain a cold rolled sheet;
and annealing and galvanizing the cold-rolled sheet to obtain the hot-dip galvanized sheet.
3. The method of claim 2, wherein hot rolling the billet to obtain a hot rolled plate comprises:
heating the casting blank, wherein the heating temperature is 1180-1250 ℃, and the tapping temperature is 1200-1250 ℃;
carrying out multi-pass rough rolling on the heated casting blank to obtain a rough rolling plate, wherein the outlet temperature of the rough rolling is 1010-1080 ℃, and the accumulated reduction rate in the rough rolling process is 70-85%;
performing multi-pass finish rolling on the rough rolled plate to obtain a finish rolled plate, wherein the start rolling temperature of the finish rolling is 1010-1080 ℃, the finish rolling temperature is 880-960 ℃, and the accumulated reduction rate in the finish rolling process is 75-90%;
and coiling the finish rolled plate after laminar cooling to obtain the hot rolled plate, wherein the coiling temperature is 660-740 ℃.
4. The method according to claim 3, wherein the heated cast slab is subjected to 4-7 rough rolling, and the reduction rate of the rough rolling of the rest of the passes except the first pass is greater than or equal to 15%.
5. The method of claim 3, wherein the rough rolled sheet is subjected to 6 to 8 finish passes, and the reduction of the last finish pass is 8% or more.
6. The method of claim 2, wherein the cumulative reduction during cold rolling of the hot rolled sheet is 60-85%.
7. The method as claimed in claim 2, wherein the temperature of the heating section is 770-830 ℃ and the conveying speed of the cold-rolled sheet is 90-120m/min and the finishing elongation is 0.8-1.5% during the annealing and galvanizing processes.
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