CN114395734A - 590 MPa-grade cold-rolled phase-change induced plasticity steel and preparation method thereof - Google Patents
590 MPa-grade cold-rolled phase-change induced plasticity steel and preparation method thereof Download PDFInfo
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- 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 provides 590 MPa-grade cold-rolled phase-change induced plasticity steel and a preparation method thereof, wherein in the preparation method, S in molten iron after pretreatment of the molten iron is less than or equal to 0.003 percent, and the thickness of iron slag is less than or equal to 20 mm; in the converter smelting process, the end point target temperature of the converter smelting process is as follows: the temperature of the first furnace is 1660-1680 ℃, and the temperature of the continuous casting furnace is 1650-1670 ℃; the end point target temperature of the external refining process is as follows: the temperature of the first furnace is 1570-1580 ℃, and the temperature of the continuous casting furnace is 1565-1575 ℃; the continuous casting drawing speed is 1.0-1.5 m/min in the continuous casting process; in the hot rolling process: the heating temperature of the plate blank is 1230-1280 ℃, the initial rolling temperature is 1110-1160 ℃, and the final rolling temperature is 840-900 ℃; the technological parameters of the continuous annealing process are as follows: the temperature of the heating section is 800 +/-10 ℃, the temperature of the soaking section is 800 +/-10 ℃, the temperature of the slow cooling section is 720 +/-10 ℃, the temperature of the fast cooling section is 420 +/-10 ℃, the temperature of the overaging section is 380 +/-10 ℃ and the temperature of the final cooling section is 150 +/-10 ℃. Through reasonable component design and heat treatment process control, the invention not only has higher production efficiency than the conventional TRIP steel, but also has stable mechanical property of the prepared TRIP steel.
Description
Technical Field
The invention relates to the field of cold-rolled phase-change induced plasticity steel, in particular to 590 MPa-grade cold-rolled phase-change induced plasticity steel and a preparation method thereof.
Background
In recent years, with the aggravation of energy crisis and global greenhouse effect, the development of modern industry and daily life of people are seriously influenced by climate change, energy shortage and the like. Energy conservation, emission reduction, low carbon and environmental protection are problems to be solved urgently in the industrial development of all countries. The development trend of the automobile industry is to realize light weight on the premise of ensuring the performance of the whole automobile. The TRIP steel, namely the transformation induced plasticity steel, induces martensite nucleation of residual austenite in a steel plate under the action of plastic deformation through the transformation induced plasticity effect, introduces transformation strengthening and plastic growth, and improves the strength and toughness of the steel plate. TRIP steel has high strength and elongation after fracture, and has become a hot point of research for automotive steel. The chemical composition is a key factor influencing the performance of the TRIP steel, and the difference of alloy elements directly influences the phase change temperature, so that the thermodynamic stability and the phase change driving force of each phase in the steel are changed, the phase change is promoted or inhibited, and the microstructure and the mechanical property are finally influenced. In the high-strength TRIP steel, the surface quality problem can be solved by using Al instead of Si, but Al cannot achieve the same solid solution strengthening effect as Si, the tensile property of the steel is reduced, the martensite start transformation temperature (Ms) is also obviously increased, and the stability of the product is reduced.
At present, on the basis of good forming performance of cold rolling phase change induced plasticity steel, on the premise of ensuring safety, automobile parts made of the cold rolling phase change induced plasticity steel can reduce weight by 12% at most, the weight of a whole automobile can be reduced by 10% at most, and the comprehensive oil consumption can be reduced by 8-10%. Therefore, cold-rolled transformation-induced plastic steel is widely used for manufacturing structural members and reinforcements thereof such as an automobile door impact beam, a bumper reinforcement, a front side member, and the like. The 590MPa grade cold rolling transformation induced plasticity steel TR590 has more excellent strength and plasticity, and can be used for manufacturing parts with more complicated formability instead of the dual-phase steel DP590 with the same strength grade. The existing component design adopts C-Si-Mn series alloy design, and the problems that the deformation resistance is large in the rolling process and the surface quality of steel is poor due to high Si content in the steel are solved.
Disclosure of Invention
In order to solve the technical problems, the 590 MPa-grade cold-rolled phase-change induced plasticity steel and the preparation method thereof are provided, the C-Si-Mn series total design is adopted, relatively low-content Si is utilized, high rapid cooling speed is combined, cementite precipitation is avoided, production at high belt speed is guaranteed through reasonable component design and heat treatment process control, the production efficiency is higher than that of conventional TRIP steel, the mechanical property is stable, ferrite, bainite and residual austenite structures in proper proportion are finally obtained to realize the mechanical property of the phase-change induced plasticity steel, the production method can be realized on the existing continuous annealing production line, high strength and high plasticity are achieved, the production difficulty is moderate, and the industrial batch production conditions are met.
The technical means adopted by the invention are as follows:
the 590 MPa-grade cold-rolled phase transformation induced plasticity steel comprises the following components in percentage by weight: c: 0.10 to 0.12%, Si: 0.70-0.90%, Mn: 1.15-1.35%, P: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the 590 MPa-grade cold-rolled phase-change induced plasticity steel, which comprises the working procedures of molten iron pretreatment, converter smelting, external refining, continuous casting, hot rolling, controlled rolling and controlled cooling, curling, acid pickling, cold rolling, continuous annealing and flattening;
the S content in the molten iron after the molten iron pretreatment is less than or equal to 0.003 percent, and the thickness of the iron slag is less than or equal to 20 mm;
in the smelting process of the converter, aluminum-iron alloy is used as a deoxidizer, active lime is selected as lime, and high manganese, ferrosilicon and low-carbon low-phosphorus ferromanganese are used for alloying; the end point target temperature of the converter smelting process is as follows: the temperature of the first furnace is 1660-1680 ℃, and the temperature of the continuous casting furnace is 1650-1670 ℃.
Further, the end point target temperature of the external refining process is as follows: the first furnace temperature is 1570-1580 ℃, and the continuous casting furnace temperature is 1565-1575 ℃.
Furthermore, high-carbon crystallizer casting powder is adopted in the continuous casting process, the covering slag in the wide and thick plate is used as a tundish covering agent, and the continuous casting drawing speed is 1.0-1.5 m/min.
Further, in the hot rolling process: the heating temperature of the plate blank is 1230-1280 ℃, the initial rolling temperature is 1110-1160 ℃, the final rolling temperature is 840-900 ℃, laminar cooling is adopted after rolling, the cooling rate is 25-35 ℃/s, and the curling temperature is 560-600 ℃; the cold rolling reduction rate is more than or equal to 55 percent; the technological parameters of the continuous annealing process are as follows: the temperature of the heating section is 800 +/-10 ℃, the temperature of the soaking section is 800 +/-10 ℃, the temperature of the slow cooling section is 720 +/-10 ℃, the temperature of the fast cooling section is 420 +/-10 ℃, the temperature of the overaging section is 380 +/-10 ℃, the temperature of the final cooling section is 150 +/-10 ℃ and the speed in the furnace is 200 +/-10 m/min.
Compared with the prior art, the invention has the following advantages:
compared with the prior art, the 590 MPa-grade cold-rolled phase-change induced plasticity steel and the preparation method thereof have the advantages that the production control is relatively simple, the characteristics of strong quick cooling capacity and longer overaging section of a continuous annealing unit are fully exerted, and the heating and cooling process parameters are easy to realize; in addition, the alloy Nb, V, Ti, Cr, Mo and other elements are not required to be added, the raw material and production cost is low, the added value is extremely high, the product has the mechanical properties of high strength and high plasticity, the more complex parts can be better processed, and the future market prospect is wide.
Based on the reason, the invention can be widely popularized in the field of cold rolling transformation induced plasticity steel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 shows the metallographic structure of 590MPa cold-rolled transformation induced plasticity steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides 590 MPa-grade cold-rolled phase-change induced plasticity steel which comprises the following components in percentage by weight: c: 0.10 to 0.12%, Si: 0.70-0.90%, Mn: 1.15-1.35%, P: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the 590 MPa-grade cold-rolled phase-change induced plasticity steel, which comprises the working procedures of molten iron pretreatment, converter smelting, external refining, continuous casting, hot rolling, controlled rolling and controlled cooling, curling, acid pickling, cold rolling, continuous annealing and flattening;
the S content in the molten iron after the molten iron pretreatment is less than or equal to 0.003 percent, and the thickness of the iron slag is less than or equal to 20 mm;
in the smelting process of the converter, aluminum-iron alloy is used as a deoxidizer, active lime is selected as lime, and high manganese, ferrosilicon and low-carbon low-phosphorus ferromanganese are used for alloying; the end point target temperature of the converter smelting process is as follows: the temperature of the first furnace is 1660-1680 ℃, and the temperature of the continuous casting furnace is 1650-1670 ℃;
the end point target temperature of the external refining process is as follows: the temperature of the first furnace is 1570-1580 ℃, and the temperature of the continuous casting furnace is 1565-1575 ℃;
in the continuous casting process, high-carbon crystallizer casting powder is adopted, the covering slag in the wide and thick plate is used as a tundish covering agent, and the continuous casting drawing speed is 1.0-1.5 m/min;
in the hot rolling process: the heating temperature of the plate blank is 1230-1280 ℃, the initial rolling temperature is 1110-1160 ℃, the final rolling temperature is 840-900 ℃, laminar cooling is adopted after rolling, the cooling rate is 25-35 ℃/s, and the curling temperature is 560-600 ℃;
the cold rolling reduction rate is more than or equal to 55 percent;
the technological parameters of the continuous annealing process are as follows: the temperature of the heating section is 800 +/-10 ℃, the temperature of the soaking section is 800 +/-10 ℃, the temperature of the slow cooling section is 720 +/-10 ℃, the temperature of the fast cooling section is 420 +/-10 ℃, the temperature of the overaging section is 380 +/-10 ℃, the temperature of the final cooling section is 150 +/-10 ℃ and the speed in the furnace is 200 +/-10 m/min.
Example 1
The 590 MPa-grade cold-rolled transformation induced plasticity steel provided by the embodiment comprises the following components in percentage by weight: c: 0.11%, Si: 0.78%, Mn: 1.25%, P: 0.005%, S: 0.001%, and the balance of Fe and inevitable impurities.
The working procedure for preparing the 590MPa cold-rolled transformation induced plasticity steel comprises the following steps: molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → coiling → acid cleaning → cold rolling → continuous annealing → leveling → functional inspection → packaging and delivery;
in the method for preparing the 590MPa cold-rolled transformation induced plasticity steel, the specific control requirements are as follows:
the S content in the molten iron after the molten iron pretreatment is less than or equal to 0.003 percent, and the thickness of the iron slag is less than or equal to 20 mm;
in the smelting process of the converter, aluminum-iron alloy is used as a deoxidizer, active lime is selected as lime, and high manganese, ferrosilicon and low-carbon low-phosphorus ferromanganese are used for alloying; the end point target temperature of the converter smelting process is as follows: the temperature of the first furnace is 1660-1680 ℃, and the temperature of the continuous casting furnace is 1650-1670 ℃;
the end point target temperature of the external refining process is as follows: the temperature of the first furnace is 1570-1580 ℃, and the temperature of the continuous casting furnace is 1565-1575 ℃;
in the continuous casting process, high-carbon crystallizer casting powder is adopted, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is 1.3 m/min.
In the hot rolling process: the heating temperature of the plate blank is 1230-1280 ℃, the initial rolling temperature is 1110-1160 ℃, the final rolling temperature is 840-900 ℃, laminar cooling is adopted after rolling, the cooling rate is 25-35 ℃/s, and the coiling temperature is 560-600 ℃; the cold rolling reduction rate is more than or equal to 55 percent; the parameters of the continuous annealing process used are shown in the following table:
the mechanical property test results of the 590MPa cold-rolled transformation induced plasticity steel provided by the embodiment are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation A80(％) | Value of n |
| Standard of merit | 380～480 | ≥590 | ≥26 | ≥0.20 |
| Example 1 | 416 | 626 | 34 | 0.24 |
Example 2
The 590 MPa-grade cold-rolled transformation induced plasticity steel provided by the embodiment comprises the following components in percentage by weight: c: 0.11%, Si: 0.80%, Mn: 1.19%, P: 0.003%, S: 0.002%, and the balance of Fe and inevitable impurities.
The process flow for preparing the 590 MPa-grade cold-rolled transformation induced plasticity steel in the embodiment is the same as that in the embodiment 1, and the difference is that the drawing speed in the continuous casting process is 1.2m/min, and the furnace speed in the parameters of the continuous annealing process is 200 m/min.
The mechanical property test results of the 590MPa cold-rolled transformation induced plasticity steel provided by the embodiment are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation A80(％) | Value of n |
| Standard of merit | 380～480 | ≥590 | ≥26 | ≥0.20 |
| Example 2 | 434 | 637 | 32.5 | 0.23 |
Example 3
The 590 MPa-grade cold-rolled transformation induced plasticity steel provided by the embodiment comprises the following components in percentage by weight: c: 0.11%, Si: 0.84%, Mn: 1.27%, P: 0.003%, S: 0.001%, and the balance of Fe and inevitable impurities.
The process flow for preparing the 590MPa cold-rolled transformation induced plasticity steel is the same as that in the example 1, and the difference is only that the furnace speed in the parameters of the continuous annealing process is 200 m/min.
The mechanical property test results of the 590MPa cold-rolled transformation induced plasticity steel provided by the embodiment are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation A80(％) | Value of n |
| Standard of merit | 380～480 | ≥590 | ≥26 | ≥0.20 |
| Example 3 | 422 | 631 | 35 | 0.22 |
Comparative example
The mechanical properties of a typical 590MPa grade cold rolled high strength steel in the prior art are shown in the following table:
| steel grade | Yield strength (MPa) | Tensile strength (MPa) | Elongation A80(％) | Value of n |
| DP590 | 388 | 647 | 27 | 0.16 |
Compared with the same-grade cold-rolled dual-phase steel DP590, the 590 MPa-grade cold-rolled transformation induced plasticity steel provided by the invention has approximate yield strength and tensile strength, higher elongation, higher work hardening index n value, excellent comprehensive mechanical property, high strength and high plasticity, so that the 590 MPa-grade cold-rolled transformation induced plasticity steel has the best forming property and wider market application potential.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The 590 MPa-grade cold-rolled transformation induced plasticity steel is characterized by comprising the following components in percentage by weight: c: 0.10 to 0.12%, Si: 0.70-0.90%, Mn: 1.15-1.35%, P: less than or equal to 0.008 percent, S: less than or equal to 0.005 percent, and the balance of Fe and inevitable impurities.
2. A preparation method of 590 MPa-grade cold-rolled phase-change induced plasticity steel comprises the working procedures of molten iron pretreatment, converter smelting, external refining, continuous casting, hot rolling, controlled rolling and controlled cooling, curling, acid cleaning, cold rolling, continuous annealing and flattening,
the S content in the molten iron after the molten iron pretreatment is less than or equal to 0.003 percent, and the thickness of the iron slag is less than or equal to 20 mm;
in the smelting process of the converter, aluminum-iron alloy is used as a deoxidizer, active lime is selected as lime, and high manganese, ferrosilicon and low-carbon low-phosphorus ferromanganese are used for alloying; the end point target temperature of the converter smelting process is as follows: the temperature of the first furnace is 1660-1680 ℃, and the temperature of the continuous casting furnace is 1650-1670 ℃.
3. The method for preparing 590MPa grade cold rolled transformation induced plasticity steel according to claim 2, wherein the end point target temperature of the external refining process is as follows: the first furnace temperature is 1570-1580 ℃, and the continuous casting furnace temperature is 1565-1575 ℃.
4. The preparation method of 590MPa cold-rolled phase change induced plasticity steel according to claim 2, wherein high-carbon crystallizer casting powder is adopted in the continuous casting process, the covering slag in the wide and thick plates is used as a tundish covering agent, and the continuous casting drawing speed is 1.0-1.5 m/min.
5. The method for preparing 590MPa grade cold rolled transformation induced plasticity steel according to claim 2, wherein in the hot rolling process: the heating temperature of the plate blank is 1230-1280 ℃, the initial rolling temperature is 1110-1160 ℃, the final rolling temperature is 840-900 ℃, laminar cooling is adopted after rolling, the cooling rate is 25-35 ℃/s, and the curling temperature is 560-600 ℃; the cold rolling reduction rate is more than or equal to 55 percent; the technological parameters of the continuous annealing process are as follows: the temperature of the heating section is 800 +/-10 ℃, the temperature of the soaking section is 800 +/-10 ℃, the temperature of the slow cooling section is 720 +/-10 ℃, the temperature of the fast cooling section is 420 +/-10 ℃, the temperature of the overaging section is 380 +/-10 ℃, the temperature of the final cooling section is 150 +/-10 ℃ and the speed in the furnace is 200 +/-10 m/min.
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| CN114395734B (en) | 2023-05-26 |
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