CN112481552A - 1000 MPa-grade cold-rolled sheet steel for automobiles and ultra-fast cooling production method - Google Patents
1000 MPa-grade cold-rolled sheet steel for automobiles and ultra-fast cooling production method Download PDFInfo
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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
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
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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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Mechanical Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to 1000 MPa-grade cold-rolled sheet automobile steel and an ultra-fast cooling production method, wherein the steel comprises the following chemical components in percentage by mass: c: 0.09% -0.20%, Si: 0.18-0.28%, Mn: 2.0-2.8%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.025 to 0.062 percent, and the balance of Fe and inevitable impurities. The advantages are that: the steel for the automobile is a cold-rolled sheet steel plate with the tensile strength of more than 1000MPa, has simple chemical components, does not add other elements except C, Si and Mn, has low smelting cost and simple and convenient process control.
Description
Technical Field
The invention belongs to the field of manufacturing of cold-rolled automobile steel, and relates to 1000 MPa-grade cold-rolled sheet (0.6-2mm) automobile steel and an ultra-fast cooling production method.
Background
The light weight of the automobile becomes the main trend of the development of the automobile industry, namely, the weight of the automobile is reduced as much as possible on the premise of ensuring the strength and the safety performance of the automobile, so that the power of the automobile is improved, the consumption of fuel is reduced, and the exhaust pollution is reduced. Experiments prove that the weight of the automobile is reduced by 1 percent, and the oil consumption is reduced by 0.7 percent. In order to meet the development requirement of light weight of automobiles, high-strength steel and ultrahigh-strength steel are produced at the same time. According to statistics, the automobile steel with the strength of 1000MPa is widely used at present. The composite material is mainly applied to structural parts, reinforcing parts and anti-collision parts of automobiles, such as automobile bumpers, anti-collision rods, anti-collision rod reinforcing frame members and the like. In order to obtain the high-strength automobile steel plate, the chemical components and the production process of the high-strength automobile steel plate need to be optimized in the research and development production process of the high-strength automobile steel plate. In the prior art, a cooling mode for producing a steel plate generally adopts a lower cooling speed to a certain temperature, and after a large number of literature analysis researches are consulted, if a steel plate with high strength grade is produced by adopting a general cooling mode, more alloy elements in various types and content need to be added, so that the production cost is increased.
The patent with the publication number of CN109371317A provides a 1000 MPa-grade ultra-fast cold-rolled dual-phase steel plate and a preparation method thereof, and the preferred chemical components of the steel plate are as follows: c: 0.1-0.15%, Si: 0.3-0.9%, Mn: 1.6-2.2%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Als: 0.03-0.06%, Nb: 0.02-0.05%, N is less than or equal to 0.005%, and the balance is Fe and inevitable impurities; the preparation method comprises the working procedures of smelting, continuous casting, hot rolling, cold rolling, annealing and leveling. Although having excellent mechanical properties, the higher carbon content affects the welding performance and the rolling difficulty. And contains alloy elements, so the production cost is higher.
Steel sheets having a strength of about 1000MPa and methods for producing the same have been proposed in each of patent publication nos. CN102586688A, CN107043888A, and CN105132816A, but the steel sheets containing Cr as an element in the component can improve the hardenability of the steel sheet, but the steel sheets are difficult to be produced in the hot rolling process.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide 1000 MPa-grade cold-rolled sheet automobile steel and an ultra-fast cooling production method, which utilize the ultra-fast cooling technology to produce a steel plate with the strength of 1000MPa under the condition of not adding any alloy element and reduce the production cost on the premise of ensuring the performance of the steel plate.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the steel for the 1000 MPa-grade cold-rolled sheet automobile comprises the following chemical components in percentage by mass: c: 0.09% -0.20%, Si: 0.18-0.28%, Mn: 2.0-2.8%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.025 to 0.062 percent, and the balance of Fe and inevitable impurities.
Yield strength of the steel for cold-rolled sheet automobiles: 700-850 MPa, tensile strength: 1000-1180 MPa, elongation: 18 to 25 percent.
C: carbon is the most effective solid solution strengthening element in steel, the strength of the steel plate is obviously increased along with the increase of the carbon content, but the carbon content is too high, the plasticity of the steel plate is reduced, and the formability and the welding performance are reduced; the carbon content is controlled to be 0.09-020% because the strength of the steel plate is insufficient due to the excessively low carbon content.
Si: the silicon element can enlarge an alpha + gamma region, so that the temperature range of treatment in a critical region is widened, the silicon is a non-carbide forming element, the strength and the cold working deformation hardening rate of the steel plate are improved through solid solution strengthening, the silicon content is insufficient, and the strength and the plasticity of the steel plate are reduced at the same time; too high silicon content may degrade the surface quality of the hot rolled slab, the plating property and the welding property of the cold rolled steel sheet. Therefore, the silicon content is 0.18% to 0.28%.
Mn: the manganese element can effectively improve the hardenability of the product, is one of effective solid solution strengthening elements and can promote the formation of martensite. If the manganese content is too high, serious component segregation can be caused, a banded structure is formed, and the mechanical property of the steel plate is influenced; the manganese content is too low, the martensite formation is insufficient, and the strength is reduced. Therefore, the manganese content is controlled to be 2.0-2.8%.
P, S: phosphorus and sulfur are residual elements, the impact toughness of steel can be seriously damaged due to too high phosphorus content, the center segregation of the steel plate is easily caused, and the secondary processing brittleness is existed, so that the hot processing and the weldability of the steel plate are influenced; the excessively high sulfur content can reduce the cold bending and hole expanding performance of the steel plate, and the steel plate and Mn are easy to form non-metallic inclusions, so that the sulfur content and the Mn content are controlled to be lower as much as possible. Namely P is less than or equal to 0.018 percent and S is less than or equal to 0.005 percent.
Al: the aluminum element is added into the steel as a deoxidizer or an alloying element, and the aluminum deoxidation capability is much stronger than that of silicon and manganese. The main functions of aluminum in steel are grain refinement and nitrogen fixation, so that the impact toughness of the steel is remarkably improved, and the cold brittleness tendency and the aging tendency are reduced. Aluminum has the disadvantage of affecting the hot workability, weldability and machinability of the steel. So the content thereof is also controlled. Therefore, the content of aluminum is controlled to be 0.025-0.062%.
A1000 MPa-grade cold-rolled sheet steel for automobiles and an ultra-fast cooling production method are disclosed, wherein the production method comprises the following steps: smelting → continuous casting → hot rolling → acid washing → cold rolling → continuous annealing; the fast cooling section of the continuous annealing process adopts an ultra-fast cooling mode, and fast cools to 80-100 ℃ at a cooling speed of 100-130 ℃/s.
The continuous annealing process comprises the following steps: heating the strip steel to 750-810 ℃ at a heating rate of 5-10 ℃/s, keeping the temperature for 180s, slowly cooling at 5-9 ℃/s and 650-730 ℃, carrying out ultra-fast cooling on the fast cooling section, heating to 270-290 ℃ at a heating rate of 30-50 ℃/s, carrying out aging treatment for 240-420 s, and then carrying out air cooling to room temperature.
The hot rolling: the heating temperature of the plate blank is 1220-1280 ℃, and the temperature is kept for more than 180 min; the initial rolling temperature of hot rolling is more than 1100 ℃, and the final rolling temperature is 870-950 ℃; the coiling temperature is 660-720 ℃.
And (3) cold rolling: the cold rolling reduction rate is controlled to be 60-70%.
Compared with the prior art, the invention has the beneficial effects that:
1) the cold-rolled sheet steel plate with the tensile strength of more than 1000MPa has simple chemical components, does not add other elements except C, Si and Mn, has low smelting cost and simple and convenient process control.
2) The invention adopts an ultra-fast cooling process, can realize that the rolled piece is rapidly cooled to the target temperature in a very short time, controls the high-temperature austenite structure form and the transformation process of the rolled material by controlling the starting temperature, the final rolling temperature and the cooling speed after rolling, and finally controls the structure type, the form and the distribution of the steel material, thereby achieving the purpose of improving the structure and the mechanical property of the rolled material. The continuous annealing is heating in a two-phase region, the cooling speed required by rapid cooling is 100-130 ℃/s, and the continuous annealing production method is simpler.
3) Ferrite (30-60%) and martensite (40-70%) tissues are obtained at room temperature, the tissues are uniform, the mechanical property is excellent, the tensile strength of the steel plate is more than 1000MPa, and meanwhile, the steel plate has good plasticity, so that an ideal light-weight material is provided for the automobile industry.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
The steel for the 1000 MPa-grade cold-rolled sheet automobile comprises the following chemical components in percentage by mass: c: 0.09-0.20%, Si: 0.18 to 0.28%, Mn: 2.0-2.8%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.025 to 0.062%, and the balance Fe and unavoidable impurities. Yield strength of 1000MPa grade cold rolled sheet steel for automobiles: 700-850 MPa, tensile strength: 1000-1180 MPa, elongation: 18 to 25 percent.
A production method of a steel plate for a 1000 MPa-level ultra-fast cold-rolled sheet comprises the following production process steps: smelting → continuous casting → hot rolling → acid washing → cold rolling → continuous annealing. Wherein, the fast cooling section of the annealing process adopts an ultra-fast cooling mode, and fast cools to 80-100 ℃ at a cooling speed of 100-130 ℃/s.
1) Smelting: smelting according to design components, namely C: 0.09% -0.20%, Si: 0.18-0.28%, Mn: 2.0-2.8%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.025 to 0.062 percent, and the balance of Fe and inevitable impurities. And continuously casting the mixture into a plate blank.
2) Hot rolling: the heating temperature of the plate blank is 1220-1280 ℃, and the temperature is kept for more than 180 min; the initial rolling temperature of hot rolling is more than 1100 ℃, and the final rolling temperature is 870-950 ℃; the coiling temperature is 660-720 ℃.
3) Acid pickling and cold rolling: the hot rolled plate is subjected to cold rolling after conventional pickling, and the cold rolling reduction is controlled to be between 60 and 70 percent.
4) And (3) continuous annealing: heating the strip steel to 750-810 ℃ at a heating rate of 5-10 ℃/s, keeping the temperature for 180s, slowly cooling at 5-9 ℃/s, slowly cooling at 650-730 ℃, ultra-fast cooling at 100-130 ℃/s, rapidly cooling to 80-100 ℃, heating to 270-290 ℃ at a heating rate of 30-50 ℃/s, aging for 240-420 s, and air cooling to room temperature.
Examples
The chemical components of the 1000MPa grade cold-rolled sheet steel for automobiles are shown in Table 1:
TABLE 1 chemical composition (wt%)
| Examples | C | Si | Mn | P | S | Als | Fe |
| 1 | 0.092 | 0.27 | 2.1 | 0.017 | 0.003 | 0.030 | Balance of |
| 2 | 0.13 | 0.19 | 2.5 | 0.012 | 0.005 | 0.028 | Balance of |
| 3 | 0.098 | 0.25 | 2.7 | 0.013 | 0.005 | 0.060 | Balance of |
| 4 | 0.12 | 0.20 | 2.3 | 0.015 | 0.004 | 0.055 | Balance of |
| 5 | 0.15 | 0.26 | 2.6 | 0.012 | 0.004 | 0.050 | Balance of |
| 6 | 0.18 | 0.21 | 2.2 | 0.014 | 0.003 | 0.058 | Balance of |
The rolling process parameters for the production of the 1000MPa grade cold-rolled sheet steel for automobiles are shown in Table 2:
TABLE 2 Rolling Process parameters
The continuous annealing process parameters of the 1000MPa grade cold-rolled sheet automobile steel production are shown in Table 3:
TABLE 3 continuous annealing Process parameters
The mechanical properties of the 1000MPa grade cold rolled sheet steel for automotive production are shown in table 4:
TABLE 4 mechanical Properties of the Steel sheets
| Examples | Rp0.2(MPa) | Rm(MPa) | A(％) |
| 1 | 756 | 1080 | 22 |
| 2 | 800 | 1100 | 21 |
| 3 | 820 | 1150 | 19 |
| 4 | 780 | 1090 | 24 |
| 5 | 816 | 1123 | 20 |
| 6 | 780 | 1076 | 23 |
The invention adopts an ultra-fast cooling process, can realize that the rolled piece is rapidly cooled to the target temperature in a very short time, controls the high-temperature austenite structure form and the transformation process of the rolled material by controlling the starting temperature, the final rolling temperature and the cooling speed after rolling, and finally controls the structure type, the form and the distribution of the steel material, thereby achieving the purpose of improving the structure and the mechanical property of the rolled material. The continuous annealing is heating in a two-phase region, the cooling speed required by rapid cooling is 100-130 ℃/s, and the continuous annealing production method is simpler.
Claims (5)
1.1000 MPa-grade cold-rolled sheet automobile steel is characterized by comprising the following chemical components in percentage by mass: c: 0.09% -0.20%, Si: 0.18-0.28%, Mn: 2.0-2.8%, P is less than or equal to 0.018%, S is less than or equal to 0.005%, Als: 0.025 to 0.062 percent, and the balance of Fe and inevitable impurities.
2. The steel for a cold-rolled sheet automobile of 1000MPa grade according to claim 1, wherein the steel for a cold-rolled sheet automobile has a yield strength of: 700-850 MPa, tensile strength: 1000-1180 MPa, elongation: 18 to 25 percent.
3. The ultra-fast cold production method of the 1000MPa grade cold-rolled sheet automotive steel according to claim 1 or 2, characterized in that the production method comprises: smelting → continuous casting → hot rolling → acid washing → cold rolling → continuous annealing; the fast cooling section of the continuous annealing process adopts an ultra-fast cooling mode, and fast cools to 80-100 ℃ at a cooling speed of 100-130 ℃/s.
4. The ultra-fast cold production method of 1000MPa grade cold-rolled sheet automotive steel according to claim 3, characterized in that said continuous annealing step: heating the strip steel to 750-810 ℃ at a heating rate of 5-10 ℃/s, keeping the temperature for 180s, slowly cooling at 5-9 ℃/s and 650-730 ℃, carrying out ultra-fast cooling on the fast cooling section, heating to 270-290 ℃ at a heating rate of 30-50 ℃/s, carrying out aging treatment for 240-420 s, and then carrying out air cooling to room temperature.
5. The ultra-fast cold production method of 1000MPa grade cold rolled sheet automotive steel according to claim 3, characterized in that said hot rolling: the heating temperature of the plate blank is 1220-1280 ℃, and the temperature is kept for more than 180 min; the initial rolling temperature of hot rolling is more than 1100 ℃, and the final rolling temperature is 870-950 ℃; the coiling temperature is 660-720 ℃;
cold rolling: the cold rolling reduction rate is controlled to be 60-70%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106219A (en) * | 2021-04-13 | 2021-07-13 | 攀钢集团西昌钢钒有限公司 | Method for improving thickness precision of ultrahigh-strength cold-rolled dual-phase steel |
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| CN109280857A (en) * | 2018-09-25 | 2019-01-29 | 邯郸钢铁集团有限责任公司 | A kind of 1200MPa grades of ultrafast cold cold-rolled biphase steel plate and preparation method thereof |
| CN109371317A (en) * | 2018-09-25 | 2019-02-22 | 邯郸钢铁集团有限责任公司 | A kind of 1000MPa grades of ultrafast cold cold-rolled biphase steel plate and preparation method thereof |
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2020
- 2020-11-11 CN CN202011252595.1A patent/CN112481552A/en active Pending
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| CN104561812A (en) * | 2014-12-26 | 2015-04-29 | 北京科技大学 | 1,000 MPa-level high-aluminum hot-dip-galvanized dual-phase steel and preparation method thereof |
| CN106011644A (en) * | 2016-07-11 | 2016-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | High-elongation and high-strength cold-rolled steel plate and preparation method thereof |
| CN108660369A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | Quenching partition cold-rolled steel plate with tensile strength of more than 1180MPa and production method thereof |
| CN107326268A (en) * | 2017-08-16 | 2017-11-07 | 马鞍山钢铁股份有限公司 | A kind of cold rolling Steel for enamel of economical deep-draw and production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113106219A (en) * | 2021-04-13 | 2021-07-13 | 攀钢集团西昌钢钒有限公司 | Method for improving thickness precision of ultrahigh-strength cold-rolled dual-phase steel |
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Application publication date: 20210312 |