CN111321351B - Two-stage warm-rolled medium manganese steel with high strength and high plasticity and preparation method thereof - Google Patents
Two-stage warm-rolled medium manganese steel with high strength and high plasticity and preparation method thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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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
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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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Abstract
本发明提供一种高强度高塑性两阶段温轧中锰钢及其制备方法，所述中锰钢的化学成分按质量百分比计为：C：0.25～0.35％，Mn：5.0～7.0％，Al：0.5～1.6％，P≤0.03％，S≤0.04％，余量为Fe及不可避免的杂质。制备方法包括如下步骤：(1)冶炼；(2)锻造；(3)两阶段温轧；(4)退火。本发明生产的抗拉强度超过1300MPa，强塑积大于60GPa％的钢板，合金化成本低，制备简单，适用范围广，满足多个行业的要求；制备过程采用两阶段温轧工艺，保证了产品的尺寸精度和厚度均匀性，同时避免了冷轧前以及轧制过程中需要长时间退火的问题，减少了生产周期，缩短了生产线，降低了生产成本和资源消耗。
The invention provides a high-strength and high-plastic two-stage warm-rolled medium-manganese steel and a preparation method thereof. The chemical components of the medium-manganese steel in terms of mass percentages are: C: 0.25-0.35%, Mn: 5.0-7.0%, Al : 0.5～1.6%, P≤0.03%, S≤0.04%, the balance is Fe and inevitable impurities. The preparation method includes the following steps: (1) smelting; (2) forging; (3) two-stage warm rolling; (4) annealing. The steel plate produced by the invention has a tensile strength of more than 1300 MPa and a strong-plastic product of more than 60 GPa%, low alloying cost, simple preparation, wide application range, and meets the requirements of many industries; the preparation process adopts a two-stage warm rolling process, which ensures the product quality. The dimensional accuracy and thickness uniformity are improved, while avoiding the problem of long annealing before cold rolling and during the rolling process, reducing the production cycle, shortening the production line, and reducing production costs and resource consumption.
Description
Technical Field
The invention belongs to the technical field of ultrahigh-strength steel, and particularly relates to high-strength high-plasticity two-stage warm-rolling medium manganese steel and a preparation method thereof.
Background
In recent years, with the increasing of energy consumption and greenhouse gas emission, energy conservation and emission reduction become important problems facing all countries in the world, while the increasing of automobile holding capacity brings great test to energy conservation and emission reduction, and energy conservation, environmental protection and safety become three major topics for the development of automobile industry. At present, the lightweight of the automobile is considered as an important measure for improving fuel efficiency and realizing energy conservation and emission reduction, and steel materials are main structural materials of the automobile and have the function that other lightweight materials cannot be replaced, so that the development of advanced high-strength steel to develop an automobile lightweight technology is imperative in order to realize energy conservation and environmental protection on the premise of ensuring safety.
Medium manganese steels, which are representative of advanced high strength steels for third generation automobiles, have received increasing attention due to higher product of strength and elongation than the first generation advanced high strength steels and lower cost than the second generation advanced high strength steels. At present, the rolling of the medium manganese steel is mainly realized by hot rolling and cold rolling, but certain problems exist. The surface quality of the manganese steel plate in hot rolling is poor, the size control is not accurate enough, and the thickness is not uniform enough; the manganese steel plate needs to be annealed once or even for many times in the processing process in the cold rolling process, and the process is complicated and the cost is high. The above problems restrict the use of medium manganese steel, and thus the development of medium manganese steel with high dimensional accuracy is required.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the high-strength high-plasticity two-stage warm rolling medium manganese steel and the preparation method thereof, and through the design of the two-stage warm rolling process, the long-term and multiple annealing process required in the cold rolling process is avoided, and simultaneously, the high strength-plasticity product is ensured.
The invention provides high-strength high-plasticity two-stage warm-rolled medium manganese steel, which comprises the following chemical components in percentage by mass: c: 0.25 to 0.35%, Mn: 5.0-7.0%, Al: 0.5-1.6 percent of Fe, less than or equal to 0.03 percent of P, less than or equal to 0.04 percent of S, and the balance of Fe and inevitable impurities.
Furthermore, the tensile strength of the medium manganese steel is 1300-1500 MPa, the yield strength is 800-1000 MPa, the elongation is 20% -50%, and the product of strength and elongation is 60-70 GPa%.
The invention also provides a preparation method of the high-strength high-plasticity two-stage warm-rolling medium manganese steel, which comprises the following steps:
(1) according to the mass percentage ratio of chemical components of the high-strength high-plasticity two-stage warm-rolled medium manganese steel, casting the medium manganese steel into a casting blank by adopting a vacuum smelting technology;
(2) heating the casting blank to 1170-1230 ℃, preserving heat for 1-3 h, forging the casting blank into a plate blank, and cooling the plate blank in air to room temperature;
(3) heating the air-cooled plate blank to 700-900 ℃, preserving heat for 2-4 h, carrying out first-stage warm rolling at 600-800 ℃, rolling into a first-stage warm rolling plate, and air-cooling to room temperature after rolling;
(4) heating the one-stage warm-rolled plate in the step (3) to 700-900 ℃, preserving heat for 10-30 min, performing second-stage warm rolling at 600-800 ℃, rolling into a two-stage warm-rolled plate, and cooling in air to room temperature after rolling;
(5) and (4) heating the two-stage warm-rolled plate in the step (4) to the temperature of an austenite-ferrite two-phase region, namely controlling the temperature at 600-700 ℃, preserving the heat for 30-120 min, and performing water quenching to room temperature to obtain the high-strength high-plasticity two-stage warm-rolled medium manganese steel.
Furthermore, in the first and second warm rolling stages of the steps (3) and (4), the initial rolling temperature is 690-720 ℃, and the final rolling temperature is 600-650 ℃.
Further, in the first-stage warm rolling process in the step (3), the casting blank is rolled into a first-stage warm rolling plate with the thickness of 4.0-5.0 mm by the total reduction rate of 80-90%.
Further, rolling into a two-stage warm-rolled plate with the thickness of 1.0-2.0 mm by a total reduction ratio of 50-75% in the second-stage warm-rolling process of the step (4).
Further, in the step (5), the microstructure of the prepared high-strength and high-plasticity two-stage warm-rolled medium manganese steel is austenite and ferrite, wherein the volume percentage of austenite is 10-50%; the structural morphology of austenite and ferrite has two states of lamellar and equiaxed.
Further, in the step (5), the microstructure of the prepared high-strength high-plasticity two-stage warm-rolling medium manganese steel is an ultra-fine grain structure with the grain size of less than 1 mu m.
The principle of the invention is as follows:
the high-strength high-plasticity two-stage warm-rolled medium manganese steel is added with the Al element properly on the basis of adding the C, Mn element, plays a role in inhibiting carbide precipitation and effectively reduces the density of the medium manganese steel. The invention adopts a two-stage warm rolling process (two-phase region rolling), and in the warm rolling process, the reverse phase transformation of austenite and the dynamic recrystallization of ferrite in the medium manganese steel occur simultaneously, so that a lamellar and equiaxed complex phase structure of austenite and ferrite is obtained. After the first-stage warm rolling, the steel plate is heated again and is subjected to heat preservation for a short time, and then the second-stage warm rolling and annealing are carried out, so that the distribution states of the lamellar austenite phase and the equiaxed austenite phase are changed, the stress states of different austenite phases in the deformation process are inconsistent, the martensite phase transformation is promoted, and the comprehensive mechanical property is improved.
Compared with the prior art, the invention has the advantages that:
1. the steel plate produced by the invention has the tensile strength of over 1300MPa and the product of strength and elongation of more than 60 GPa%, has low alloying cost, simple preparation and wide application range, and meets the requirements of a plurality of industries; the preparation process adopts a two-stage warm rolling process, so that the dimensional accuracy and the thickness uniformity of the product are ensured, the problem that long-time annealing is needed before cold rolling and in the rolling process is avoided, the production period is shortened, the production line is shortened, and the production cost and the resource consumption are reduced;
2. according to the invention, through the design of alloy components, the heat preservation time and the rolling reduction in the processing process and the heat treatment process, the volume fraction, the shape and the distribution state of the residual austenite in the structure are controlled, so that the TRIP effect can be fully generated in the deformation process, and the comprehensive mechanical property of the material is greatly improved.
Drawings
FIG. 1 is an SEM photograph of a two-stage warm-rolled sheet after two-stage warm rolling in example 1 of the present invention;
FIG. 2 is an SEM photograph of a manganese steel in a two-stage warm rolling after annealing in a critical section in example 1 of the present invention;
FIG. 3 is an XRD pattern of a manganese steel in a two-stage warm rolling process after annealing in a critical zone in example 1 of the present invention;
FIG. 4 is a stress-strain curve of a manganese steel in a two-stage warm rolling after annealing in the critical section in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The high-strength high-plasticity two-stage warm-rolled medium manganese steel comprises the following chemical components in percentage by mass: c: 0.28%, Mn: 5.90%, Al: 0.90%, P: 0.02%, S: 0.03%, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength high-plasticity two-stage warm-rolling medium manganese steel comprises the following steps:
(1) according to the mass percentage ratio of chemical components of the high-strength high-plasticity two-stage warm-rolled medium manganese steel, casting the medium manganese steel into a casting blank by adopting a vacuum smelting technology;
(2) heating the casting blank to 1200 ℃, preserving heat for 2 hours, forging the casting blank into a plate blank, and cooling the plate blank to room temperature in air;
(3) heating the air-cooled plate blank to 850 ℃, preserving heat for 3h, performing first-stage warm rolling, wherein the initial rolling temperature is 700 ℃, the final rolling temperature is 600 ℃, the casting blank needs 6 times of warm rolling, the total reduction rate is 87.5%, the blank is warm-rolled into a 4mm first-stage warm-rolled plate, and the first-stage warm-rolled plate is air-cooled to the room temperature;
(4) heating the one-stage warm-rolled plate in the step (3) to 750 ℃, preserving heat for 30min, carrying out second-stage warm rolling, wherein the initial rolling temperature is 700 ℃, the final rolling temperature is 600 ℃, the one-stage warm-rolled plate is warm-rolled into a 1.5mm two-stage warm-rolled plate through a total reduction rate of 62.5%, air cooling is carried out after rolling to room temperature, and the microstructure of the two-stage warm-rolled plate is shown in figure 1;
(5) and (4) carrying out critical zone annealing on the two-stage warm-rolled plate in the step (4), namely heating the two-stage warm-rolled plate to the temperature of an austenite-ferrite two-phase zone, controlling the temperature at 660 ℃, keeping the temperature for 30min, and carrying out water quenching to room temperature to obtain the high-strength high-plasticity two-stage warm-rolled medium manganese steel, wherein the microstructure of the two-stage warm-rolled medium manganese steel is shown in figure 2.
The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the invention is an austenite and ferrite two-phase structure, wherein the volume percentage of austenite is 39.10%, and the XRD test result is shown in figure 3; the structural morphology of austenite and ferrite has two states of lamellar and equiaxed; the microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the invention is an ultrafine grain structure with the grain size of less than 1 mu m.
After the manganese steel prepared by the invention is subjected to unidirectional stretching in the two-stage warm rolling process, austenite in the structure is fully subjected to TRIP effect phase transformation to form martensite, the tensile strength is 1398.88MPa, the elongation is 43.94%, the product of strength and elongation is 61.47 GPa%, the yield strength is 927.79MPa, and the stress-strain curve is shown in figure 4.
Example 2
The high-strength high-plasticity two-stage warm-rolled medium manganese steel comprises the following chemical components in percentage by mass: c: 0.31%, Mn: 6.00%, Al: 1.03%, P: 0.02%, S: 0.02%, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength high-plasticity two-stage warm-rolling medium manganese steel comprises the following steps:
(1) according to the mass percentage ratio of chemical components of the high-strength high-plasticity two-stage warm-rolled medium manganese steel, casting the medium manganese steel into a casting blank by adopting a vacuum smelting technology;
(2) heating the casting blank to 1190 ℃, preserving heat for 2.5h, forging the casting blank into a plate blank, and cooling the plate blank to room temperature in air;
(3) heating the air-cooled plate blank to 900 ℃, preserving heat for 3.5h, carrying out first-stage warm rolling, wherein the initial rolling temperature is 720 ℃, the final rolling temperature is 620 ℃, the casting blank needs 6 times of warm rolling, the total reduction rate is 87.2%, the blank is warm-rolled into a 4.1mm first-stage warm-rolled plate, and the first-stage warm-rolled plate is air-cooled to the room temperature;
(4) heating the one-stage warm-rolled plate in the step (3) to 740 ℃, preserving heat for 25min, carrying out second-stage warm rolling, wherein the initial rolling temperature is 710 ℃, the final rolling temperature is 620 ℃, and the one-stage warm-rolled plate is warm-rolled into a 1.4mm two-stage warm-rolled plate by a total reduction ratio of 65.9%, and then air-cooling to room temperature;
(5) and (4) carrying out critical zone annealing on the two-stage warm-rolled plate in the step (4), namely heating the two-stage warm-rolled plate to the temperature of an austenite-ferrite two-phase zone, controlling the temperature at 669 ℃, keeping the temperature for 30min, and carrying out water quenching to room temperature to obtain the high-strength high-plasticity two-stage warm-rolled medium manganese steel.
The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the invention is an austenite and ferrite two-phase structure, wherein the volume percentage of austenite is 40.03%; the structural morphology of austenite and ferrite has two states of lamellar and equiaxed. The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the invention is an ultrafine grain structure with the grain size of less than 1 mu m.
After the manganese steel prepared by the invention is subjected to unidirectional stretching in the two-stage warm rolling process, austenite in the structure is fully subjected to TRIP effect phase transformation to form martensite, the tensile strength is 1446.65MPa, the elongation is 41.66%, the product of strength and elongation is 60.27 GPa%, and the yield strength is 865.16 MPa.
Example 3
The high-strength high-plasticity two-stage warm-rolled medium manganese steel comprises the following chemical components in percentage by mass: c: 0.26%, Mn: 6.12%, Al: 1.59%, P: 0.03%, S: 0.01%, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength high-plasticity two-stage warm-rolling medium manganese steel comprises the following steps:
(1) according to the mass percentage ratio of chemical components of the high-strength high-plasticity two-stage warm-rolled medium manganese steel, casting the medium manganese steel into a casting blank by adopting a vacuum smelting technology;
(2) heating the casting blank to 1230 ℃, preserving heat for 3 hours, forging the casting blank into a plate blank, and cooling the plate blank in air to room temperature;
(3) heating the air-cooled plate blank to 860 ℃, preserving heat for 4 hours, carrying out first-stage warm rolling, wherein the initial rolling temperature is 700 ℃, the final rolling temperature is 610 ℃, the casting blank needs 6 times of warm rolling, the total reduction rate is 84.4%, the blank is warm-rolled into a first-stage warm-rolled plate with the thickness of 5mm, and the first-stage warm-rolled plate is air-cooled to the room temperature;
(4) heating the one-stage warm-rolled plate in the step (3) to 720 ℃, preserving heat for 20min, carrying out second-stage warm rolling, wherein the initial rolling temperature is 695 ℃, the final rolling temperature is 600 ℃, and the one-stage warm-rolled plate is warm-rolled into a 1.5mm two-stage warm-rolled plate by a total reduction ratio of 70%, and then air-cooling to room temperature;
(5) and (4) carrying out critical zone annealing on the two-stage warm-rolled plate in the step (4), namely heating the two-stage warm-rolled plate to the temperature of an austenite-ferrite two-phase zone, controlling the temperature at 653 ℃, keeping the temperature for 60min, and carrying out water quenching to room temperature to obtain the high-strength high-plasticity two-stage warm-rolled medium manganese steel.
The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the method is an austenite and ferrite two-phase structure, wherein the volume percentage of austenite is 42.83%; the structural morphology of austenite and ferrite has two states of lamellar and equiaxed. The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the invention is an ultrafine grain structure with the grain size of less than 1 mu m.
After the manganese steel prepared by the invention is subjected to unidirectional stretching in the two-stage warm rolling process, austenite in the structure is fully subjected to TRIP effect phase transformation to form martensite, the tensile strength is 1319.28MPa, the elongation is 48.45%, the product of strength and elongation is 63.92 GPa%, and the yield strength is 817.99 MPa.
Example 4
The high-strength high-plasticity two-stage warm-rolled medium manganese steel comprises the following chemical components in percentage by mass: c: 0.30%, Mn: 5.90%, Al: 0.95%, P: 0.01%, S: 0.03%, and the balance of Fe and inevitable impurities.
The preparation method of the high-strength high-plasticity two-stage warm-rolling medium manganese steel comprises the following steps:
(1) according to the mass percentage ratio of chemical components of the high-strength high-plasticity two-stage warm-rolled medium manganese steel, casting the medium manganese steel into a casting blank by adopting a vacuum smelting technology;
(2) heating the casting blank to 1220 ℃, preserving heat for 2 hours, forging the casting blank into a plate blank, and cooling the plate blank to room temperature in air;
(3) heating the air-cooled plate blank to 880 ℃, preserving heat for 3 hours, carrying out first-stage warm rolling at the beginning temperature of 695 ℃ and the final temperature of 600 ℃, carrying out 6-pass warm rolling on the casting blank, wherein the total reduction rate is 85.9%, carrying out warm rolling to obtain a 4.5mm first-stage warm rolling plate, and carrying out air cooling on the first-stage warm rolling plate to room temperature;
(4) heating the one-stage warm-rolled plate in the step (3) to 725 ℃, preserving heat for 15min, carrying out second-stage warm rolling, wherein the initial rolling temperature is 695 ℃, the final rolling temperature is 600 ℃, and the one-stage warm-rolled plate is warm-rolled into a 1.5mm two-stage warm-rolled plate by a total reduction rate of 66.7%, and then air-cooling to room temperature;
(5) and (4) carrying out critical zone annealing on the two-stage warm-rolled plate in the step (4), namely heating the two-stage warm-rolled plate to the temperature of an austenite-ferrite two-phase zone, controlling the temperature to be 660 ℃, keeping the temperature for 120min, and carrying out water quenching to room temperature to obtain the high-strength high-plasticity two-stage warm-rolled medium manganese steel.
The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the method is an austenite and ferrite two-phase structure, wherein the volume percentage of austenite is 42.26%; the structural morphology of austenite and ferrite has two states of lamellar and equiaxed. The microstructure of the high-strength high-plasticity two-stage warm-rolling medium manganese steel prepared by the invention is an ultrafine grain structure with the grain size of less than 1 mu m.
After the manganese steel prepared by the invention is subjected to unidirectional stretching in the two-stage warm rolling process, austenite in the structure is fully subjected to TRIP effect phase transformation to form martensite, the tensile strength is 1424.8MPa, the elongation is 44.51%, the product of strength and elongation is 63.42 GPa%, and the yield strength is 824.90 MPa.
The technical idea of the present invention is described in the above technical solutions, and the protection scope of the present invention is not limited thereto, and any changes and modifications made to the above technical solutions according to the technical essence of the present invention belong to the protection scope of the technical solutions of the present invention.
Claims (6)
1. The high-strength high-plasticity two-stage warm-rolled medium manganese steel is characterized in that: the medium manganese steel comprises the following chemical components in percentage by mass: c: 0.25 to 0.35%, Mn: 5.0-7.0%, Al: 0.5-1.6 percent of Fe, less than or equal to 0.03 percent of P, less than or equal to 0.04 percent of S, and the balance of Fe and inevitable impurities; the microstructure of the high-strength and high-plasticity two-stage warm-rolling medium manganese steel is austenite and ferrite, wherein the volume percentage of austenite is 10-50%; the structural morphology of austenite and ferrite has two states of lamellar and equiaxed; the tensile strength of the medium manganese steel is 1300-1500 MPa, the yield strength is 800-1000 MPa, the elongation is 41.66% -50%, and the product of strength and elongation is 60-70 GPa%.
2. The method for preparing the high-strength high-plasticity two-stage warm-rolling medium manganese steel according to claim 1, which comprises the following steps:
(1) according to the mass percentage ratio of chemical components of the high-strength high-plasticity two-stage warm-rolled medium manganese steel, casting the medium manganese steel into a casting blank by adopting a vacuum smelting technology;
(2) heating the casting blank to 1170-1230 ℃, preserving heat for 1-3 h, forging the casting blank into a plate blank, and cooling the plate blank in air to room temperature;
(3) heating the air-cooled plate blank to 700-900 ℃, preserving heat for 2-4 h, carrying out first-stage warm rolling at 600-800 ℃, rolling into a first-stage warm rolling plate, and air-cooling to room temperature after rolling;
(4) heating the one-stage warm-rolled plate in the step (3) to 700-900 ℃, preserving heat for 10-30 min, performing second-stage warm rolling at 600-800 ℃, rolling into a two-stage warm-rolled plate, and cooling in air to room temperature after rolling;
(5) and (4) heating the two-stage warm-rolled plate in the step (4) to the temperature of an austenite-ferrite two-phase region, namely controlling the temperature at 600-700 ℃, preserving the heat for 30-120 min, and performing water quenching to room temperature to obtain the high-strength high-plasticity two-stage warm-rolled medium manganese steel.
3. The method for preparing the high-strength high-plasticity two-stage warm-rolling medium manganese steel according to claim 2, characterized by comprising the following steps: in the first and second warm rolling processes of the steps (3) and (4), the initial rolling temperature is 690-720 ℃, and the final rolling temperature is 600-650 ℃.
4. The method for preparing the high-strength high-plasticity two-stage warm-rolling medium manganese steel according to claim 2, characterized by comprising the following steps: and (4) rolling the casting blank into a one-stage warm rolling plate with the thickness of 4.0-5.0 mm by using the total reduction rate of 80-90% in the first-stage warm rolling process of the step (3).
5. The method for preparing the high-strength high-plasticity two-stage warm-rolling medium manganese steel according to claim 2, characterized by comprising the following steps: and (4) rolling into a two-stage warm rolling plate with the thickness of 1.0-2.0 mm by a total reduction rate of 50-75% in the second-stage warm rolling process of the step (4).
6. The method for preparing the high-strength high-plasticity two-stage warm-rolling medium manganese steel according to claim 2, characterized by comprising the following steps: in the step (5), the microstructure of the prepared high-strength high-plasticity two-stage warm-rolling medium manganese steel is an ultrafine grain structure with the grain size of less than 1 mu m.
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| CN112410681B (en) * | 2020-11-26 | 2022-07-26 | 燕山大学 | High-strength-ductility medium manganese steel and preparation method thereof |
| CN114085971B (en) * | 2021-11-16 | 2023-03-21 | 沈阳理工大学 | A process for producing high-strength plastic-laminated ferrite-martensitic dual-phase steel by cross-rolling and continuous annealing |
| CN115216589A (en) * | 2022-07-28 | 2022-10-21 | 湖南华菱湘潭钢铁有限公司 | Heat treatment method for improving core toughness of steel for large-thickness high-strength ocean engineering |
| CN115323252B (en) * | 2022-08-31 | 2023-04-25 | 哈尔滨工业大学（深圳） | Ultrahigh-strength high-plasticity medium manganese steel and preparation method thereof |
| CN116555672A (en) * | 2023-02-28 | 2023-08-08 | 南京理工大学 | A kind of high-strength toughness medium manganese steel plate and preparation method thereof |
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