CN118086776A - Hot rolled steel plate and preparation method thereof - Google Patents
Hot rolled steel plate and preparation method thereof Download PDFInfo
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- CN118086776A CN118086776A CN202410353150.4A CN202410353150A CN118086776A CN 118086776 A CN118086776 A CN 118086776A CN 202410353150 A CN202410353150 A CN 202410353150A CN 118086776 A CN118086776 A CN 118086776A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 92
- 239000010959 steel Substances 0.000 title claims abstract description 92
- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000002791 soaking Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 238000009749 continuous casting Methods 0.000 abstract description 4
- 238000005554 pickling Methods 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 238000004321 preservation Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The application relates to a hot rolled steel plate and a preparation method thereof, belonging to the technical field of metallurgy. The steel plate comprises the following chemical components: 0.005-0.04% of C, less than or equal to 0.05% of Si, mn:0.05 to 0.4 mass percent, less than or equal to 0.015 mass percent of P, less than or equal to 0.002 mass percent of S, 0.02 to 0.05 mass percent of Al and Fe; the metallographic structure is ferrite and a very small amount of pearlite. The strip steel is produced in a multi-mode sheet bar continuous casting and rolling production line, and the chemical components, the finishing temperature, the coiling temperature, the pickling process and the like of the strip steel are controlled, and online heat preservation cover equipment is used on a laminar cooling roller way, so that the prepared hot rolled steel plate has the characteristics of thin specification, low strength and high elongation, the thickness is 0.8-1.2mm, the yield strength is 170-240MPa, the tensile strength is 280-340MPa, the elongation is 46-55%, partial cold rolled products can be replaced, the low-carbon green sustainable development target is realized, and the green transformation of the steel industry and the automobile industry is promoted.
Description
Technical Field
The application relates to the technical field of metallurgy, in particular to a hot rolled steel plate and a preparation method thereof.
Background
The steel industry and the automobile industry are newly transformed, steel is an important basic industry of national economy, and is also an important field for realizing green low-carbon development, wherein the steel is a large family of energy consumption and a large family of carbon dioxide emission.
The statistics show that the cold-rolled sheet accounts for more than 70% in the steel consumption of the passenger car, and the production process of the cold-rolled sheet comprises the following steps: smelting, continuous casting, hot rolling, pickling, cold rolling, annealing and the like, and the production process is long, and the high cost, high energy consumption and high emission are brought. Therefore, in order to achieve the goal of low-carbon green sustainable development and promote green transformation in the steel industry and the automobile industry, development of a hot rolled steel sheet capable of replacing part of cold rolled products is urgently needed.
Disclosure of Invention
The application provides a hot rolled steel plate and a preparation method thereof, which are used for solving the technical problems that the existing cold rolling technology for producing steel for automobiles is high in cost, high in energy consumption and high in emission, and is unfavorable for low-carbon green sustainable development targets.
In a first aspect, the present application provides a hot rolled steel sheet comprising the chemical components of:
0.005-0.04% of C, less than or equal to 0.05% of Si, mn:0.05 to 0.4 mass percent, less than or equal to 0.015 mass percent of P, less than or equal to 0.002 mass percent of S, 0.02 to 0.05 mass percent of Al and Fe.
Optionally, the metallographic structure of the steel plate is ferrite and pearlite.
Alternatively, the average diameter of the ferrite grains is 9 μm to 12 μm.
In a second aspect, the present application provides a method for producing a hot rolled steel sheet for use in the production of any one of the hot rolled steel sheets according to the first aspect, the method comprising:
Under the conditions of setting the drawing speed and the casting blank thickness, continuously casting the molten steel containing the chemical components to obtain a casting blank;
heating the casting blank under the condition of setting soaking temperature;
under the conditions of setting the rough rolling inlet temperature, setting the thickness of the intermediate billet and setting the rough rolling outlet temperature, rough rolling is carried out on the heated casting blank;
Performing finish rolling on the casting blank after rough rolling under the conditions of setting finish rolling inlet temperature and finish rolling temperature to obtain strip steel;
coiling the strip steel under the condition of setting coiling temperature, and then carrying out stack cooling to obtain a hot rolled steel coil;
And removing surface scale on the hot rolled steel coil in a high-acid washing production line, wherein the scale breaking withdrawal and straightening machine adopts a constant-elongation mode.
Optionally, the value of the set blank drawing speed is 4.8-5.8 m/min, and the value of the set blank thickness is 110-123 mm.
Optionally, the value of the set soaking temperature is 1150-1200 ℃.
Optionally, the value of the rough rolling inlet temperature is more than or equal to 1150 ℃, the value of the thickness of the set intermediate billet is 8mm-12mm, and the value of the set rough rolling outlet temperature is 930-1000 ℃.
Optionally, the finish rolling inlet temperature is 1000-1050 ℃, and the finish rolling temperature is more than or equal to 840 ℃.
Optionally, the value of the set coiling temperature is 710 ℃ to 750 ℃.
Optionally, the elongation of the scale breaking tension leveler is 0.3% -0.6%.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
According to the method provided by the embodiment of the application, the steel plate with lower strength and higher elongation is obtained by adding proper amounts of C element and Mn element into the chemical components of the steel matrix, the hot rolled steel plate obtained by the method has the thickness of 0.8-1.2mm, the yield strength of 170-240MPa, the tensile strength of 280-340MPa and the elongation of 46-55%, has the characteristics of thin specification, low strength and high elongation, can replace partial cold rolled products, realizes the aim of low-carbon green sustainable development, and promotes green transformation in steel industry and automobile industry.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a metallographic structure of a steel according to example 1 of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present application are commercially available or may be prepared by existing methods.
Various embodiments of the application may exist in a range of forms; it should be understood that the description in a range format is merely for convenience and brevity and should not be construed as a rigid limitation on the scope of the application; it is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1,2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In the present application, unless otherwise specified, terms such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present specification, the terms "include", "comprising" and the like mean "including but not limited to".
Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a. b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
In order to solve the technical problems, the technical scheme provided by the application has the following thought:
in a first aspect, the present application provides a hot rolled steel sheet comprising the chemical components of:
0.005-0.04% of C, less than or equal to 0.05% of Si, mn:0.05 to 0.4 mass percent, less than or equal to 0.015 mass percent of P, less than or equal to 0.002 mass percent of S, 0.02 to 0.05 mass percent of Al and Fe.
In this example, C has a strong solid solution strengthening effect, but in order to obtain a low strength and a high elongation, the carbon content is preferably controlled to be 0.005 to 0.04 mass%. The Si element mainly affects the surface quality of the hot rolled strip steel and the steel plate after pickling, and the Si content is controlled to be less than or equal to 0.05 mass percent for ensuring the surface quality of the strip steel. Mn functions as solid solution strengthening and hardenability improvement in steel, and Mn is easily segregated in steel to form MnS inclusions, and the Mn content is preferably controlled to be 0.05 to 0.2 mass% in order to reduce the strength of the steel sheet and improve the elongation. P and S affect corrosion resistance and workability of steel, and must be strictly controlled, so in this patent, P content is controlled to be not more than 0.015 mass%, and S content is controlled to be not more than 0.002 mass%. Al is an essential deoxidizing element in steel, but an excessively high Al content impairs toughness of steel, and in order to secure deoxidizing effect, the Al content is controlled to be 0.02 to 0.05 mass% in the present application.
In some embodiments, the metallographic structure of the steel sheet is ferrite and pearlite.
Ferrite is a soft phase, can reduce the strength of the steel sheet, has high elongation after break, good plasticity, and has a very small amount of pearlite.
In some embodiments, the average diameter of the ferrite grains is 9 μm to 12 μm.
In the embodiment, the ferrite grains have uniform size, so that the forming performance of the steel plate can be improved, and the cracking risk is reduced in the downstream user stamping forming use process.
In a second aspect, the present application provides a method for producing a hot rolled steel sheet for use in the production of any one of the hot rolled steel sheets according to the first aspect, the method comprising:
Under the conditions of setting the drawing speed and the casting blank thickness, continuously casting the molten steel containing the chemical components to obtain a casting blank;
heating the casting blank under the condition of setting soaking temperature;
under the conditions of setting the rough rolling inlet temperature, setting the thickness of the intermediate billet and setting the rough rolling outlet temperature, rough rolling is carried out on the heated casting blank;
Performing finish rolling on the casting blank after rough rolling under the conditions of setting finish rolling inlet temperature and finish rolling temperature to obtain strip steel;
coiling the strip steel under the condition of setting coiling temperature, and then carrying out stack cooling to obtain a hot rolled steel coil;
And under the condition of setting the leveling elongation, performing leveling treatment on the hot rolled steel coil to obtain a hot rolled steel plate.
In the embodiment, the raw materials are prepared according to the designed chemical components, smelting is carried out on the raw materials in a blast furnace, and continuous casting is carried out after the molten iron is subjected to KR desulfurization, conventional converter smelting, VD furnace and LF furnace refining treatment. And (3) descaling is carried out before rough rolling, wherein the descaling pressure is not less than 30MPa, and the rough rolling adopts irreversible 3-pass rolling. In order to control the finish rolling inlet temperature, electromagnetic induction heating equipment is adopted to heat the intermediate blank, the outlet temperature of the heater is controlled to be 1100-1200 ℃, 5-9 groups of electromagnetic induction heating equipment are adopted, each group of electromagnetic induction heating equipment consists of two induction heaters which are respectively positioned on the upper side and the lower side of the strip steel, and the edge parts of the induction heaters are 120-200mm away from the edge parts of the strip steel. The finish rolling adopts 5-pass rolling, the accumulated deformation of the finish rolling is 70% -90%, and after finishing finish rolling, the strip steel enters an on-line heat insulation cover device, so that the temperature drop on a laminar cooling roller way is reduced, and the strip steel is ensured to have higher coiling temperature. After the hot rolled steel coil is taken off line, the hot rolled steel coil is cooled to room temperature by adopting a cold stacking mode, so that the structural uniformity can be improved, the size of the crystal grain is controlled, the strength of the strip steel is reduced, and the elongation is improved. And then the steel coil is pickled in a continuous high-acid pickling line to remove surface iron scales, and the steel coil is flattened by using a constant-elongation-rate mode scale breaking withdrawal and straightening machine.
In some embodiments, the set withdrawal speed is from 4.8m/min to 5.8m/min, and the set casting blank thickness is from 110mm to 123mm.
In the embodiment, the higher blank pulling speed can reduce the temperature drop of the strip steel in the rolling process, reduce the induction heating temperature, reduce the energy consumption, save the energy, roll the strip steel in an austenite region and ensure the uniformity of the structure; the thickness of the casting blank can ensure that more heat energy is stored in the slab, the temperature drop in the rolling process is reduced, and the thicker casting blank can ensure enough compression ratio, so that the strip steel tissue is more uniform in the thickness direction, and the forming performance of the steel plate is improved.
In some embodiments, the set soaking temperature has a value of 1150-1200 ℃.
In the embodiment, the higher soaking temperature can enable the temperature distribution of the casting blank to be more uniform, enable the austenite grain size of the strip steel plate in the width direction to be uniform, avoid local high points and ensure the production stability.
In some embodiments, the rough rolling inlet temperature is greater than or equal to 1150 ℃, the thickness of the intermediate billet is set to 8mm-12mm, and the rough rolling outlet temperature is set to 930 ℃ -1000 ℃.
In this embodiment, the higher rough rolling temperature can reduce the rolling load of the roughing mill, the thinner intermediate billet thickness can reduce the reduction ratio of finish rolling, the thickness dimension precision is ensured, and meanwhile, the higher rough rolling outlet temperature can reduce the induction heating temperature while guaranteeing the finish rolling inlet temperature, thereby saving energy and reducing carbon emission.
In some embodiments, the finish rolling inlet temperature is from 1000 ℃ to 1050 ℃ and the finish rolling temperature is greater than or equal to 840 ℃.
In the embodiment, the higher finish rolling inlet temperature and finish rolling temperature can ensure the production of the finish rolling process to be smooth and stable, reduce the load of a finishing mill, avoid rolling strip steel in a two-phase zone and ensure the uniformity of strip steel tissues.
In some embodiments, the set coiling temperature is 710 ℃ to 750 ℃ and the elongation of the scale breaking and straightening machine is 0.3% -0.6%.
In the embodiment, the higher coiling temperature can further improve the size of the structural grains of the strip steel, cooling water is not boiled in the whole laminar cooling stage, the temperature uniformity of the strip steel can be improved, and the forming performance of a steel plate is improved. The elongation of the scale breaking straightening and withdrawal machine is 0.3% -0.6%, so that the surface scale can be effectively removed, the strip steel shape can be corrected, the steel plate has higher elongation, and if the scale breaking straightening and withdrawal machine is used with overlarge elongation, the steel plate elongation can be reduced, and the usability of the material is affected.
The application will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Table 1 shows the chemical compositions of the steels of examples 1 to 7 and comparative examples 1 to 3 according to the present application, table 2 shows the relevant parameters of the production processes of examples 1 to 7 and comparative examples 1 to 3 according to the present application, and Table 3 shows the mechanical properties of the steel sheets of examples 1 to 7 and comparative examples 1 to 3 according to the present application.
TABLE 1 mass percent of chemical composition (balance Fe and unavoidable impurities)
TABLE 2 manufacturing process parameters for the examples of the application
TABLE 3 mechanical Properties of the Steel sheet according to the example of the application
The invention is based on a sheet billet continuous casting and rolling production line and a continuous high-strong acid washing production line, and prepares the thin-specification low-strength high-elongation steel plate by controlling the chemical components, the finishing temperature, the coiling temperature, the acid washing process and the like of strip steel and using on-line heat preservation cover equipment on a laminar cooling roller way, and the thickness of the thin-specification low-strength high-elongation steel plate is 0.8-1.2mm, the yield strength is 170-240MPa, the tensile strength is 280-340MPa, the elongation is 46-55%, the problems of higher strength and lower elongation of the steel plate in the earlier stage are solved, and partial cold-rolled steel plates can be replaced, so that the production procedures are reduced, the carbon emission is reduced, and the energy is saved.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A hot rolled steel sheet, characterized in that the steel sheet comprises the chemical components:
0.005-0.04% of C, less than or equal to 0.05% of Si, mn:0.05 to 0.4 mass percent, less than or equal to 0.015 mass percent of P, less than or equal to 0.002 mass percent of S, 0.02 to 0.05 mass percent of Al and Fe.
2. The hot rolled steel sheet as claimed in claim 1 wherein the metallographic structure of the steel sheet is ferrite and pearlite.
3. The hot rolled steel sheet according to claim 1, wherein the average diameter of the ferrite grains is 9 μm to 12 μm.
4. A method of producing a hot rolled steel sheet, comprising:
Under the conditions of setting the drawing speed and the casting blank thickness, continuously casting the molten steel containing the chemical components to obtain a casting blank;
heating the casting blank under the condition of setting soaking temperature;
under the conditions of setting the rough rolling inlet temperature, setting the thickness of the intermediate billet and setting the rough rolling outlet temperature, rough rolling is carried out on the heated casting blank;
Performing finish rolling on the casting blank after rough rolling under the conditions of setting finish rolling inlet temperature and finish rolling temperature to obtain strip steel;
coiling the strip steel under the condition of setting coiling temperature, and then carrying out stack cooling to obtain a hot rolled steel coil;
And removing surface scale on the hot rolled steel coil in a high-acid washing production line, wherein the scale breaking withdrawal and straightening machine adopts a constant-elongation mode.
5. The method according to claim 4, wherein the set withdrawal speed is set to a value of 4.8m/min to 5.8m/min, and the set casting blank thickness is set to a value of 110mm to 123mm.
6. The method according to claim 4, wherein the set soaking temperature has a value of 1150 ℃ to 1200 ℃.
7. The method according to claim 4, wherein the rough rolling inlet temperature is equal to or higher than 1150 ℃, the thickness of the intermediate billet is set to 8mm-12mm, and the rough rolling outlet temperature is set to 930 ℃ to 1000 ℃.
8. The method according to claim 4, wherein the finish rolling inlet temperature is 1000 ℃ to 1050 ℃ and the finish rolling temperature is equal to or higher than 840 ℃.
9. The method according to claim 4, wherein the set winding temperature has a value of 710 ℃ to 750 ℃.
10. The method according to claim 4, wherein the elongation of the scale breaking tension leveler is 0.3% -0.6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410353150.4A CN118086776A (en) | 2024-03-26 | 2024-03-26 | Hot rolled steel plate and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410353150.4A CN118086776A (en) | 2024-03-26 | 2024-03-26 | Hot rolled steel plate and preparation method thereof |
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