CN108546881B - Preparation method of yield-platform-free cold-rolled medium manganese steel thin strip - Google Patents
Preparation method of yield-platform-free cold-rolled medium manganese steel thin strip Download PDFInfo
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- CN108546881B CN108546881B CN201810465215.9A CN201810465215A CN108546881B CN 108546881 B CN108546881 B CN 108546881B CN 201810465215 A CN201810465215 A CN 201810465215A CN 108546881 B CN108546881 B CN 108546881B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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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
-
- 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
-
- 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
- C21D2211/001—Austenite
-
- 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
Abstract
The invention belongs to the technical field of steel alloy materials, and particularly relates to a preparation method of a yield-platform-free cold-rolled medium manganese steel thin strip. The technical scheme of the invention is as follows: a preparation method of a yield-platform-free cold-rolled medium manganese steel thin strip comprises the following steps: (1) smelting molten steel; (2) pouring into a tundish; (3) pouring a cloth bag; (4) casting and rolling by using double-roller thin strip continuous casting equipment; (5) hot rolling the cast strip for one time, and curling after air cooling; (6) reverse phase transformation annealing of the hot rolled coil; (7) cold rolling after acid washing; (8) and (5) performing reverse phase transformation annealing on the cold-rolled sheet. The method for preparing the yield-platform-free cold-rolled medium manganese steel thin strip provided by the invention is used for preparing the yield-platform-free cold-rolled medium manganese steel thin strip so as to solve the problem that the finished plate is obviously wrinkled due to the fact that the Luders strip is easy to appear when the cold-rolled medium manganese steel is deformed, and solve the problems of long conventional production process, high cost, high energy consumption and the like of the cold-rolled medium manganese steel.
Description
Technical Field
The invention belongs to the technical field of steel alloy materials, and particularly relates to a preparation method of a yield-platform-free cold-rolled medium manganese steel thin strip.
Background
Energy conservation, emission reduction, vehicle weight reduction and vehicle collision safety improvement are main targets of development of the current automobile industry, and development of automobile steel towards high strength becomes an important development trend. The advanced high-strength steel has excellent strength and plasticity matching (namely, a product of strength and plasticity), and can ensure the collision safety performance of the automobile while reducing the weight of the automobile. The first generation of advanced high-strength steel has a low strength-plasticity product (less than or equal to 25 GPa%), and mainly comprises steel grades such as dual-phase steel, interstitial-free steel, transformation induced plasticity steel and the like; the second-generation advanced high-strength steel has a high product of strength and elongation (40-70 GPa%) and mainly comprises high-manganese steel. The second generation advanced high-strength steel is added with more alloy elements such as manganese, so that the production cost is higher. Therefore, the development of third-generation advanced high-strength steel is urgently needed, and the medium manganese steel is considered to be the third-generation advanced high-strength steel with great potential at present. The mass fraction range of manganese in the medium manganese steel is 3-12%, and ferrite and austenite structures can be obtained through a reverse phase transformation annealing process. The content of austenite in the medium manganese steel is 20% -60%, and the medium manganese steel has a higher product of strength and elongation (25-60 GPa%).
However, it is found that the relatively long luders strip phenomenon occurs in the stretching process of the cold-rolled medium manganese steel, and the luders strip reduces the surface quality of the medium manganese steel sheet in the forming process, so that the finished sheet has obvious wrinkles, and the use of users is affected. In addition, the conventional production process of the existing cold-rolled medium manganese steel is long, after smelting and continuous casting, high-temperature homogenization treatment of a casting blank is required, heating to 1200-1250 ℃ is usually required, heat preservation is carried out for a long time, then rough rolling and finish rolling processes are carried out, so that a hot rolled plate is obtained, and then subsequent acid washing, cold rolling and annealing process flows are carried out. The conventional production process has the advantages of high energy consumption, long production process and relatively high preparation cost.
Disclosure of Invention
The invention provides a method for preparing a cold-rolled medium manganese steel thin strip without a yield platform, which is used for solving the problems that the deformation of the cold-rolled medium manganese steel is easy to cause the phenomenon of obvious wrinkles of finished plates due to a Luders strip and solving the problems of long conventional production flow, high cost, high energy consumption and the like of the cold-rolled medium manganese steel.
The technical scheme of the invention is as follows:
a preparation method of a yield-platform-free cold-rolled medium manganese steel thin strip comprises the following steps:
(1) smelting molten steel, wherein the molten steel comprises the following components in percentage by mass: 0.1-0.4% of C, 3-10% of Mn, less than 2% of Si, less than 3% of Al, less than 0.002% of S, less than 0.002% of P, less than 0.002% of O, less than 0.003% of N and the balance of Fe;
(2) then pouring the molten steel into a tundish, pouring the molten steel into a distribution bag from the tundish, finally pouring the molten steel into a double-roller thin strip continuous casting device from the distribution bag, and obtaining a casting strip with the thickness of 1.5-3.0 mm through casting and rolling;
(3) cooling the cast strip to the initial rolling temperature, then carrying out one-pass hot rolling, wherein the initial rolling temperature is 1000-1250 ℃, the total rolling reduction of the hot rolling is 10-30%, the final rolling temperature is 900-1150 ℃, and after hot rolling, air cooling to 300-500 ℃ for curling to obtain a hot rolled plate;
(4) heating the hot rolled plate to 600-800 ℃, and preserving heat for 30 min-8 h to complete reverse phase transition annealing to obtain a reverse phase transition annealed hot rolled plate;
(5) removing oxide scales from the hot rolled plate subjected to reverse phase transition annealing through acid pickling, and then performing cold rolling, wherein the total cold rolling reduction is 10-27%, so that a cold rolled plate is obtained;
(6) and heating the cold-rolled sheet to 600-800 ℃, preserving the heat for 1-12 min, completing reverse phase transformation annealing, and then air-cooling to room temperature to obtain the yield-platform-free cold-rolled medium manganese steel thin strip with the thickness of 0.75-1.9 mm.
The preparation method of the yield-platform-free cold-rolled medium manganese steel thin strip has the preferable scheme that the reverse phase transition annealing time of the cold-rolled sheet is 1-12 min.
The preparation method of the yield-platform-free cold-rolled medium manganese steel thin strip has the preferable scheme that the structure of the yield-platform-free cold-rolled medium manganese steel thin strip comprises lath ferrite and lath austenite.
The preparation method of the yield-platform-free cold-rolled medium manganese steel thin strip has the preferable scheme that the engineering stress-strain curve of the yield-platform-free cold-rolled medium manganese steel thin strip has the characteristic of continuous yield, the tensile strength of the yield-platform-free cold-rolled medium manganese steel thin strip is 700-1400 MPa, and the elongation after fracture is 20-60%.
The invention has the beneficial effects that: the preparation process of the manganese steel thin strip in the yield-free platform cold rolling process utilizes a double-roller thin strip continuous casting technology, directly casts and rolls the molten steel into a cast strip with the thickness of 1.5-3.0 mm, omits production equipment such as a continuous casting machine, a casting blank heating furnace, a rough rolling and finishing mill set and the like of the traditional strip steel production process, and obviously shortens the whole production flow of the strip steel, so that the production energy consumption and the production cost can be effectively reduced.
Detailed Description
In the specific implementation process, the molten steel in the distribution flow packet is poured into the twin-roll strip casting equipment, the molten steel in the distribution flow packet is poured into a cavity formed by two casting rolls and side sealing plates with opposite rotation directions to form a molten pool, and the molten steel is solidified through roll gaps of the casting rolls and is led out.
The standard adopted for testing the tensile strength and the elongation after fracture in the embodiment of the invention is GB/T228.1-2010, the gauge length of the tensile sample is 25mm, and the tensile rate is 2mm/min when the tensile sample is tested at room temperature.
Example 1
Smelting molten steel, wherein the components of the smelting molten steel comprise, by mass, 0.23% of C, 4% of Mn, 0.5% of Si, 2% of Al, 0.001% of S, 0.0012% of P, 0.002% of O, 0.001% of N and the balance of Fe; then pouring the molten steel into a tundish, pouring the molten steel into a distribution bag from the tundish, finally pouring the molten steel into a double-roller thin strip continuous casting device from the distribution bag, and obtaining a casting strip with the thickness of 2.0mm through casting and rolling;
cooling the cast strip to the initial rolling temperature, then carrying out one-pass hot rolling, wherein the initial rolling temperature is 1250 ℃, the total rolling reduction of the hot rolling is 20%, the final rolling temperature is 1150 ℃, and after hot rolling, air cooling to 400 ℃ for curling to obtain a hot rolled plate;
heating the hot rolled plate to 700 ℃, and preserving heat for 60min to finish reverse phase transition annealing to obtain a reverse phase transition annealed hot rolled plate;
pickling the hot rolled plate subjected to reverse phase transition annealing to remove oxide scales, and then carrying out cold rolling, wherein the total cold rolling reduction is 20%, so as to obtain a cold rolled plate;
and heating the cold-rolled sheet to 700 ℃, preserving the heat for 5min, finishing reverse phase transformation annealing, and then air-cooling to room temperature to obtain the yield-platform-free cold-rolled medium manganese steel thin strip, wherein the thickness of the thin strip is 1.28mm, the tensile strength is 1050MPa, the elongation after fracture is 48%, and the structure consists of a lath ferrite structure and a lath austenite structure.
Example 2
Smelting molten steel, wherein the components of the smelting molten steel comprise, by mass, 0.1% of C, 10% of Mn, 0.5% of Si, 1% of Al, 0.002% of S, 0.002% of P, 0.001% of O, 0.003% of N and the balance of Fe; then pouring the molten steel into a tundish, pouring the molten steel into a distribution bag from the tundish, finally pouring the molten steel into a double-roller thin strip continuous casting device from the distribution bag, and obtaining a casting strip with the thickness of 3.0mm through casting and rolling;
cooling the cast strip to the initial rolling temperature, then carrying out one-pass hot rolling, wherein the initial rolling temperature is 1120 ℃, the total rolling reduction of the hot rolling is 30%, the final rolling temperature is 900 ℃, and after hot rolling, air cooling to 500 ℃ for curling to obtain a hot rolled plate;
heating the hot rolled plate to 600 ℃ and preserving heat for 8h to finish reverse phase transition annealing to obtain a reverse phase transition annealed hot rolled plate;
pickling the hot rolled plate subjected to reverse phase transition annealing to remove oxide scales, and then carrying out cold rolling, wherein the total cold rolling reduction is 10%, so as to obtain a cold rolled plate;
and heating the cold-rolled sheet to 600 ℃ and preserving the heat for 12min, finishing reverse phase transformation annealing, and then air-cooling to room temperature to obtain the cold-rolled medium manganese steel thin strip without the yield platform, wherein the thickness of the cold-rolled medium manganese steel thin strip is 1.9mm, the tensile strength of the cold-rolled medium manganese steel thin strip is 1400MPa, the elongation after fracture is 20%, and the structure of the cold-rolled medium manganese steel thin strip consists of lath ferrite and lath austenite structures.
Example 3
Smelting molten steel, wherein the components of the smelting molten steel comprise, by mass, 0.2% of C, 3% of Mn, 1% of Si, 1% of Al, 0.001% of S, 0.0013% of P, 0.0012% of O, 0.001% of N and the balance of Fe; then pouring the molten steel into a tundish, pouring the molten steel into a distribution bag from the tundish, finally pouring the molten steel into a double-roller thin strip continuous casting device from the distribution bag, and obtaining a casting strip with the thickness of 1.5mm through casting and rolling;
cooling the cast strip to the initial rolling temperature, then carrying out one-pass hot rolling, wherein the initial rolling temperature is 1000 ℃, the total rolling reduction of the hot rolling is 30%, the final rolling temperature is 920 ℃, and after hot rolling, air cooling to 300 ℃ for curling to obtain a hot rolled plate;
heating the hot rolled plate to 800 ℃, and preserving heat for 30min to finish reverse phase transition annealing to obtain a reverse phase transition annealed hot rolled plate;
pickling the hot rolled plate subjected to reverse phase transition annealing to remove oxide scales, and then carrying out cold rolling, wherein the total cold rolling reduction is 25%, so as to obtain a cold rolled plate;
and heating the cold-rolled sheet to 800 ℃, preserving the heat for 1min, completing reverse phase transformation annealing, and then air-cooling to room temperature to obtain the cold-rolled medium manganese steel thin strip without the yield platform, wherein the thickness of the cold-rolled medium manganese steel thin strip is 0.75mm, the tensile strength of the cold-rolled medium manganese steel thin strip is 700MPa, the elongation after fracture is 45%, and the structure of the cold-rolled medium manganese steel thin strip consists of lath ferrite and lath austenite structures.
Example 4
Smelting molten steel, wherein the components of the smelting molten steel comprise, by mass, 0.4% of C, 9% of Mn, 2% of Si, 3% of Al, 0.0012% of S, 0.001% of P, 0.002% of O, 0.003% of N and the balance of Fe; then pouring the molten steel into a tundish, pouring the molten steel into a distribution bag from the tundish, finally pouring the molten steel into a double-roller thin strip continuous casting device from the distribution bag, and obtaining a casting strip with the thickness of 2.2mm through casting and rolling;
cooling the cast strip to the initial rolling temperature, then carrying out one-pass hot rolling, wherein the initial rolling temperature is 1140 ℃, the total rolling reduction of the hot rolling is 15%, the final rolling temperature is 960 ℃, and after hot rolling, air cooling to 430 ℃ for curling to obtain a hot rolled plate;
heating the hot rolled plate to 750 ℃, and preserving heat for 5 hours to finish reverse phase transition annealing to obtain a reverse phase transition annealed hot rolled plate;
pickling the hot rolled plate subjected to reverse phase transition annealing to remove oxide scales, and then carrying out cold rolling, wherein the total cold rolling reduction is 15%, so as to obtain a cold rolled plate;
and heating the cold-rolled sheet to 720 ℃, preserving the temperature for 3min, finishing reverse phase transformation annealing, and then air-cooling to room temperature to obtain the yield-platform-free cold-rolled medium manganese steel thin strip, wherein the thickness of the thin strip is 1.6mm, the tensile strength of the thin strip is 900MPa, the elongation after fracture is 60%, and the structure of the thin strip consists of lath ferrite and lath austenite.
Claims (1)
1. A preparation method of a yield-platform-free cold-rolled medium manganese steel thin strip is characterized by comprising the following steps of:
(1) smelting molten steel, wherein the molten steel comprises the following components in percentage by mass: 0.1-0.4% of C, 9-10% of Mn, less than 2% of Si, less than 3% of Al, less than 0.002% of S, less than 0.002% of P, less than 0.002% of O, less than 0.003% of N and the balance of Fe;
(2) then pouring the molten steel into a tundish, pouring the molten steel into a distribution bag from the tundish, finally pouring the molten steel into a double-roller thin strip continuous casting device from the distribution bag, and obtaining a casting strip with the thickness of 1.5-3.0 mm through casting and rolling;
(3) cooling the cast strip to the initial rolling temperature, then carrying out one-pass hot rolling, wherein the initial rolling temperature is 1000-1250 ℃, the total hot rolling reduction is 10-30%, the final rolling temperature is 900-1150 ℃, and after hot rolling, air cooling to 300-430 ℃ for curling to obtain a hot rolled plate;
(4) heating the hot rolled plate to 600-800 ℃, and preserving heat for 30 min-8 h to complete reverse phase transition annealing to obtain a reverse phase transition annealed hot rolled plate;
(5) removing oxide scales from the hot rolled plate subjected to reverse phase transition annealing through acid pickling, and then performing cold rolling, wherein the total cold rolling reduction is 10-27%, so that a cold rolled plate is obtained;
(6) heating the cold-rolled sheet to 600-800 ℃, preserving the heat for 1 min-12 min, completing reverse phase transition annealing, wherein the reverse phase transition annealing time of the cold-rolled sheet is 1 min-12 min, and then air-cooling to room temperature to obtain a yield-platform-free cold-rolled medium manganese steel thin strip with the thickness of 0.75-1.9 mm; the structure of the yield-free platform cold-rolled medium manganese steel thin strip comprises lath ferrite and lath austenite; the engineering stress-strain curve of the cold-rolled medium manganese steel thin strip without the yield platform has the characteristic of continuous yield, the tensile strength of the cold-rolled medium manganese steel thin strip is 700-1400 MPa, and the elongation after fracture is 20-60%.
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| CN110453146B (en) * | 2019-08-21 | 2021-08-17 | 首钢集团有限公司 | Cr alloyed steel without yield platform and preparation method thereof |
| EP4019654A1 (en) * | 2020-12-23 | 2022-06-29 | Fundación Azterlan | Low density medium alloyed steels with aluminium and manganese |
| CN114107623B (en) * | 2021-12-01 | 2023-09-15 | 安徽工业大学 | Heat treatment method for reducing timeliness of SPHC hot rolled plate coil by online isothermal aging removal annealing |
| CN115537677B (en) * | 2022-09-29 | 2023-10-13 | 武汉科技大学 | High-strength high-plasticity austenitic high-manganese steel with double-peak structure and production method thereof |
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| CN103357828B (en) * | 2013-07-29 | 2015-03-04 | 东北大学 | Casting system used for twin-roll thin strip continuous casting and use method thereof |
| CN106086640B (en) * | 2016-06-21 | 2018-10-02 | 北京科技大学 | A kind of cold rolling medium managese steel and preparation method thereof of superhigh intensity plasticity product |
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