CN113122691A - Low-delta r-value micro-carbon steel hot-dip galvanized steel plate and preparation method thereof - Google Patents
Low-delta r-value micro-carbon steel hot-dip galvanized steel plate and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a low-delta-r-value micro-carbon steel hot-dip galvanized steel plate and a preparation method thereof. The invention aims to provide a low-delta-r-value micro-carbon steel hot-dip galvanized steel plate and a preparation method thereof. The preparation method comprises the following steps: smelting, hot rolling, acid rolling, annealing and hot galvanizing. Aiming at the micro-carbon steel hot-dip galvanized steel plate, the invention prepares the micro-carbon steel hot-dip galvanized steel plate with higher strength and delta R lower than 0.08 by strictly controlling parameters in hot rolling, acid rolling and hot-dip galvanizing processes, and the obtained micro-carbon steel hot-dip galvanized steel plate Rp0.2The pressure is 150 to 180MPa,the tensile strength is 280-350 MPa, the elongation is more than or equal to 42.0%, r90 is more than or equal to 2.0, n90 is more than or equal to 0.21, and r is more than or equal to 1.6.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a low-delta-r-value micro-carbon steel hot-dip galvanized steel plate and a preparation method thereof.
Background
With the rapid development of national economic construction in China, the market demand for high-performance hot-dip galvanized steel sheets is continuously improved, and the hot-dip galvanized steel sheets with high stamping forming performance have become targets pursued by various enterprises on the premise of ensuring other performances, and especially have great attention in the industries of automobiles and household appliances.
At present, domestic and foreign enterprises carry out a series of researches on the aspect of improving the stamping formability of a hot-dip galvanized steel sheet, wherein a Chinese patent CN101036968A discloses a production method of a deep drawing finish hot-dip galvanized steel sheet, and the hot-dip galvanized steel sheet comprises the following chemical components in percentage by weight: c: 0.003 to 0.006%, 0.02 to 0.04%, a hot rolling coiling temperature of 750 to 780 ℃, and a cold rolling annealing temperature of 780 to 880 ℃. The yield strength of the finished product is about 180MPa, the tensile strength is about 310MPa, the elongation is about 42.0%, n is about 0.21, and r is about 1.9. For another example, patent CN102839322A discloses a hot-dip galvanized steel sheet for automobiles and a production method thereof, wherein the hot-dip galvanized steel sheet for automobiles comprises the following chemical components in percentage by weight: 0.001 to 0.003%, Si: less than or equal to 0.03 percent, Mn: 0.05-0.15%, P: less than or equal to 0.02 percent, S: 0.008-0.015%, Als: 0.02 to 0.07%, Ti: 0.05-0.09%, B: 0.0002 to 0.01 percent, and the balance of Fe. The yield strength of the finished product is about 160MPa, the tensile strength is about 280MPa, the elongation is about 44.0 percent, r90Value about 2.4, n90The value is 0.24.
In the prior art, various technical means are adopted to improve the stamping forming performance of hot dip galvanizing, but the obtained hot dip galvanized steel sheet has larger delta r value, complex production process and higher cost, and is not beneficial to the production and application of steel for automobiles and home appliances.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a preparation method of a low-delta-r-value micro-carbon steel hot-dip galvanized steel plate, which comprises the following steps:
(1) smelting: smelting the micro-carbon steel into a casting blank according to chemical components of the micro-carbon steel; the chemical components of the micro-carbon steel comprise the following components in percentage by weight: c: less than or equal to 0.03%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.30%, P: 0.005-0.015%, S: 0.005-0.015%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
(2) a hot rolling procedure: heating a casting blank, removing phosphorus, roughly rolling, finely rolling, cooling and coiling to obtain a hot-rolled coil; wherein the start rolling temperature of finish rolling is 900-930 ℃, the finish rolling temperature is 740-760 ℃, and the coiling temperature is 560-600 ℃;
(3) acid rolling process: pickling the hot rolled coil and then cold rolling the pickled hot rolled coil into thin strip steel;
(4) annealing and hot galvanizing working procedures: annealing and hot galvanizing the thin strip steel to prepare a hot galvanized steel plate; in the hot galvanizing procedure, after annealing is finished, the temperature is quickly cooled to 440-460 ℃ of a zinc pool furnace nose, the quick cooling rate is 10-50 ℃/s, the galvanizing time is 7-30 s, and after galvanizing, the zinc pool furnace nose is cooled to room temperature at the final cooling rate of 5-10 ℃/s.
Preferably, in the smelting process in the step (1), the chemical components of the micro-carbon steel comprise, by weight: c: less than or equal to 0.03%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.25%, P: 0.005-0.012%, S: 0.005-0.012%, Als: 0.020-0.065%, and the balance of Fe and inevitable impurities.
Wherein, in the hot rolling procedure in the step (2), the steel is heated to 1110-1150 ℃, the furnace time is 200-260 min, and 5-pass rough rolling is adopted.
Wherein, in the acid rolling procedure in the step (3), the cold rolling reduction is 75-85%.
Wherein in the annealing procedure in the step (4), the heating temperature is 690-760 ℃, the soaking temperature is 780-800 ℃, and the slow cooling temperature is 550-600 ℃.
Wherein, in the hot galvanizing procedure in the step (4), the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃.
Has the advantages that: aiming at the micro-carbon steel hot-dip galvanized steel plate, the invention prepares the micro-carbon steel hot-dip galvanized steel plate with higher strength and delta R lower than 0.08 by strictly controlling parameters in hot rolling, acid rolling and hot-dip galvanizing processes, and the obtained micro-carbon steel hot-dip galvanized steel plate Rp0.2150-180 MPa, tensile strength 280-350 MPa, elongation rate not less than 42.0%, r90 not less than 2.0, n90 not less than 0.21, and r not less than 1.6. The method has simple preparation process and low cost, and realizes low-energy-consumption production.
Detailed Description
The invention provides a preparation method of a low-delta-r-value micro-carbon steel hot-dip galvanized steel plate, which comprises the following steps of:
(1) smelting: smelting the micro-carbon steel into a casting blank according to chemical components of the micro-carbon steel; the thickness of the casting blank is 200 mm;
(2) a hot rolling procedure: heating the casting blank to 1110-1150 ℃, carrying out rough rolling after the furnace time is 200-260 min, wherein the rough rolling adopts 5-pass rolling, the phosphorus is removed for the whole length, a heat preservation cover is used in the rolling process, and the thickness of the intermediate plate blank after rough rolling is 39-43 mm; after rough rolling, fine rolling is carried out, the start rolling temperature of the fine rolling is 900-930 ℃, the finish rolling temperature is 740-760 ℃, after the fine rolling, the steel plate is naturally cooled to 560-600 ℃ to be coiled to obtain a hot rolled coil, and the thickness of the steel plate is 3.5 mm;
(3) acid rolling process: pickling the hot rolled coil, and then cold rolling the pickled hot rolled coil into thin strip steel, wherein the cold rolling reduction rate is 75-85%;
(4) annealing and hot galvanizing working procedures: hot galvanizing the cold-rolled thin strip steel to prepare a required hot galvanized steel plate; the annealing process comprises three stages of heating, soaking and slow cooling, wherein the heating temperature is 690-760 ℃, the soaking temperature is 780-800 ℃, and the slow cooling temperature is 550-600 ℃; the heating stage aims to enable the slab to have a buffering process to enter soaking, the soaking stage is the actual annealing stage, and the slow cooling stage aims to enable the slab to have a buffering process to carry out hot galvanizing, so that the quality of the slab is guaranteed.
In the hot galvanizing procedure, the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃, the temperature of the furnace nose of the zinc pool is quickly cooled to 440 to 460 ℃ after annealing, the quick cooling rate CR1 is 10 to 50 ℃/s, the galvanizing time is 7 to 30s, and the zinc pool is cooled to the room temperature at the final cooling rate CR2 of 5 to 10 ℃/s after galvanizing.
The value Δ r represents the change in the anisotropy coefficient r with direction in the sheet surface, which results in a difference in sidewall height (called a ledge) when the cylindrical cup is press formed. The magnitude of the value Δ r determines the extent of formation of the upper lug of the cup-shaped drawing part.
The Δ r value is defined as: Δ r ═ r0-2r45+r90) 2; in the formula, subscripts 0, 45, and 90 indicate angles between the orientations of the uniaxial tensile specimens and the sheet rolling direction.
The larger the Δ r value, the more severe the anisotropy in the sheet surface, which is manifested by the uneven edges of the drawn piece forming lugs and the uneven wall thickness aggravating the quality of the formed piece.
Δ r > 0, the draw piece lugs are in the 0 ° and 90 ° directions; Δ r < 0, and the drawing piece lug is in the 45 ° direction.
The plate material has an important effect on the rectangular drawing piece relative to the direction of anisotropy, and the direction with a large r value is preferably pointed to the four corners of the rectangle, and the four corners are formed by requiring the real drawing performance with the large r value. The maximum r value of most low-carbon aluminum killed steel cold-rolled steel sheets is perpendicular to the rolling direction, so that a large amount of waste materials can be caused when the rectangular drawing part blank is placed in the four-angle mode in the rolling direction. The micro-carbon steel has the characteristics of low strength and high elongation, and the material flow in all directions is uniform and the anisotropy is good during stamping.
Therefore, the invention selects the micro-carbon steel for smelting, and the chemical components of the micro-carbon steel comprise the following components in percentage by weight: c: less than or equal to 0.03%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.30%, P: 0.005-0.015%, S: 0.005-0.015%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities.
Preferably, the chemical composition of the micro-carbon steel comprises the following components in percentage by weight: c: less than or equal to 0.03%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.25%, P: 0.005-0.012%, S: 0.005-0.012%, Als: 0.020-0.065%, and the balance of Fe and inevitable impurities.
In the hot rolling procedure, the rough rolling aims at carrying out austenite deformation at low temperature, so that a casting blank is heated to 1110-1150 ℃, rough rolling is carried out after the furnace time is 200-260 min, the rough rolling adopts 5-pass rolling, the phosphorus is removed in the whole length, and a heat preservation cover is used in the rolling process.
Since the micro carbon steel has a different austenite recrystallization temperature and a different transformation temperature from other steels, such as IF steel, the hot rolling process is different for the purpose of rolling in the austenite region.
Because the influence of hot rolling on the texture is obvious, and more {111} textures are generated, which is beneficial to reducing the delta r value, the invention controls the rolling temperature at the beginning of finish rolling to be 900-930 ℃, the rolling temperature at the end to be 740-760 ℃ and the coiling temperature to be 560-600 ℃ in order to obtain the microcarbon steel hot dip galvanized steel plate with the low delta r value.
The dew point temperature of the protective atmosphere in the furnace is a mark of the water content in the protective gas in the furnace, and the surface of the strip steel is oxidized when the temperature is too high; the temperature is too low, the oxidation reduction of the surface of the strip steel is not thorough, and the final surface quality is poor, so the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃.
The heating temperature is set according to the soaking temperature and the self temperature in the furnace, if the temperature is too low, the temperature in the furnace is reduced, and the realization is difficult; the temperature is too high, which directly influences the requirement of the subsequent soaking temperature, so the heating temperature in the annealing process of the method is 690-760 ℃.
The soaking temperature is determined according to the recrystallization temperature range of the strip steel, the temperature is too low, the tissue of the strip steel is not recrystallized, and the crack is easy to occur in the stamping process; the temperature is too high, the grains continue to grow excessively after recrystallization is finished, and cracking can occur in the stamping process, so the soaking temperature in the annealing process of the method is 780-800 ℃.
The slow cooling temperature is set according to the regulation and control of the product organization and the temperature of the zinc pot; the temperature of the furnace nose is determined according to the temperature of a zinc pot, and the temperature of the zinc pot is to ensure the temperature of zinc liquid and the smooth operation of strip steel; the rapid cooling speed is set according to the equipment of the unit, the temperature between the soaking temperature and the slow cooling temperature and the speed of the strip steel; the galvanizing time is set according to the speed of the strip steel. Therefore, comprehensively considered, the annealing process of the invention has the slow cooling temperature of 550-600 ℃, the annealing process is rapidly cooled to the temperature of 440-460 ℃ of the zinc pool nose after the annealing is finished, the rapid cooling rate CR1 is 10-50 ℃/s, the galvanizing time is 7-30 s, and the annealing process is cooled to the room temperature at the final cooling rate CR2 of 5-10 ℃/s after the galvanizing.
Examples
The invention is further illustrated and described by the following examples and comparative examples.
The following examples and comparative examples were all smelted into casting blanks according to the chemical compositions in table 1; the thickness of the casting blank is 200 mm;
heating the casting blank, carrying out rough rolling after the furnace time is 240min, wherein the rough rolling adopts 5-pass rolling, the whole length and the whole number of phosphorus removal, a heat preservation cover is used in the rolling process, and the thickness of the intermediate plate blank after the rough rolling is 42.0 mm;
after rough rolling, the plate blank is subjected to finish rolling, after finish rolling, the plate blank is naturally cooled and coiled to obtain a hot rolled coil, and the thickness of the obtained steel plate is 3.5 mm;
pickling the hot rolled coil, and cold rolling the hot rolled coil into thin strip steel, wherein the cold rolling reduction rate is 80.0 percent;
finally, the micro-carbon steel hot-dip galvanized steel plate is obtained through annealing and hot-dip galvanizing processes. In the hot galvanizing process, the dew point temperature of the protective atmosphere in the furnace is-26 ℃, and the furnace is rapidly cooled to the furnace nose temperature of the zinc pool of 455 ℃ after the annealing is finished, wherein the annealing temperature refers to the soaking temperature.
Specific process parameters of the hot rolling and annealing processes are shown in tables 2 and 3, and the mechanical properties of the obtained hot-dip galvanized steel sheet are shown in table 4.
TABLE 1 chemical composition of micro-carbon steel hot dip galvanized steel sheet
| Numbering | C | Si | Mn | P | S | Als |
| Example 1 | 0.023 | 0.008 | 0.17 | 0.008 | 0.011 | 0.039 |
| Example 2 | 0.024 | 0.007 | 0.16 | 0.008 | 0.011 | 0.038 |
| Comparative example 1 | 0.043 | 0.01 | 0.27 | 0.015 | 0.013 | 0.045 |
| Comparative example 2 | 0.035 | 0.01 | 0.25 | 0.016 | 0.012 | 0.042 |
TABLE 2 Hot Rolling Main Process parameters
| Numbering | Heating temperature/. degree.C | Finish rolling temperature/. degree.C | Final Rolling temperature/. degree.C | Coiling temperature/. degree.C |
| Example 1 | 1130 | 914 | 753 | 573 |
| Example 2 | 1125 | 919 | 759 | 580 |
| Comparative example 1 | 1230 | 1031 | 930 | 746 |
| Comparative example 2 | 1235 | 1030 | 931 | 740 |
TABLE 3 main process parameters for hot dip galvanizing annealing
| Numbering | Annealing temperature/. degree.C | Fast cooling rate/° C/s | Galvanizing time/s | End cooling rate/° C/s |
| Example 1 | 800 | 23 | 19 | 7.6 |
| Example 2 | 798 | 22 | 20 | 7.3 |
| Comparative example 1 | 820 | 15 | 36 | 8.8 |
| Comparative example 2 | 821 | 15 | 35 | 8.9 |
TABLE 4 mechanical Properties of hot-dip galvanized steel sheets
Claims (7)
1. The preparation method of the low-delta r-value micro-carbon steel hot-dip galvanized steel plate is characterized by comprising the following steps of: the method comprises the following steps:
(1) smelting: smelting the micro-carbon steel into a casting blank according to chemical components of the micro-carbon steel; the chemical components of the micro-carbon steel comprise the following components in percentage by weight: c: less than or equal to 0.03%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.30%, P: 0.005-0.015%, S: 0.005-0.015%, Als: 0.020-0.070%, and the balance of Fe and inevitable impurities;
(2) a hot rolling procedure: heating a casting blank, removing phosphorus, roughly rolling, finely rolling, cooling and coiling to obtain a hot-rolled coil; wherein the start rolling temperature of finish rolling is 900-930 ℃, the finish rolling temperature is 740-760 ℃, and the coiling temperature is 560-600 ℃;
(3) acid rolling process: pickling the hot rolled coil and then cold rolling the pickled hot rolled coil into thin strip steel;
(4) annealing and hot galvanizing working procedures: annealing and hot galvanizing the thin strip steel to prepare a hot galvanized steel plate; in the hot galvanizing procedure, after annealing is finished, the temperature is quickly cooled to 440-460 ℃ of a zinc pool furnace nose, the quick cooling rate is 10-50 ℃/s, the galvanizing time is 7-30 s, and after galvanizing, the zinc pool furnace nose is cooled to room temperature at the final cooling rate of 5-10 ℃/s.
2. The method for preparing the low- Δ r-value micro-carbon steel hot-dip galvanized steel sheet according to claim 1, characterized in that: in the smelting procedure of the step (1), the chemical components of the micro-carbon steel comprise the following components in percentage by weight: c: less than or equal to 0.03%, Si: less than or equal to 0.02 percent, Mn: 0.10-0.25%, P: 0.005-0.012%, S: 0.005-0.012%, Als: 0.020-0.065%, and the balance of Fe and inevitable impurities.
3. The method for preparing the low- Δ r-value micro-carbon steel hot-dip galvanized steel sheet according to claim 1 or 2, characterized in that: in the hot rolling procedure in the step (2), the steel is heated to 1110-1150 ℃, the furnace time is 200-260 min, and 5-pass rough rolling is adopted.
4. The method for producing a low Δ r microcarbon steel hot-dip galvanized steel sheet according to any one of claims 1 to 3, characterized in that: in the acid rolling procedure of the step (3), the cold rolling reduction is 75-85%.
5. The method for preparing the low- Δ r-value micro-carbon steel hot-dip galvanized steel sheet according to any one of claims 1 to 4, characterized in that: in the annealing procedure in the step (4), the heating temperature is 690-760 ℃, the soaking temperature is 780-800 ℃, and the slow cooling temperature is 550-600 ℃.
6. The method for preparing the low- Δ r-value micro-carbon steel hot-dip galvanized steel sheet according to any one of claims 1 to 5, characterized in that: in the hot galvanizing procedure in the step (4), the dew point temperature of the protective atmosphere in the furnace is-25 to-60 ℃.
7. The micro-carbon steel hot-dip galvanized steel sheet prepared by the method for preparing the low- Δ r-value micro-carbon steel hot-dip galvanized steel sheet according to any one of claims 1 to 6.
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| 苟淑云: "生产工艺对低碳铝镇静钢热镀锌钢板性能的影响", 《钢铁》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114395689A (en) * | 2021-12-09 | 2022-04-26 | 安阳钢铁集团有限责任公司 | Method for reducing yield platform |
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