CN110724805A - Preparation method of high-strength anti-seismic steel for building - Google Patents
Preparation method of high-strength anti-seismic steel for building Download PDFInfo
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- CN110724805A CN110724805A CN201911007968.6A CN201911007968A CN110724805A CN 110724805 A CN110724805 A CN 110724805A CN 201911007968 A CN201911007968 A CN 201911007968A CN 110724805 A CN110724805 A CN 110724805A
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C21D2211/001—Austenite
Abstract
The invention discloses a preparation method of a high-strength anti-seismic steel for buildings, which comprises the following steps: the method comprises the following steps: the billet is heated, and theoretically, the heating temperature of common steel is the austenite homogenization temperature. The invention adopts a two-stage process in the process of rolling steel, in the first stage, the original rolling process adopts 14.58 percent of average reduction rate, the optimization process adopts 12.42 percent of average reduction rate to achieve the same thickness of an intermediate blank, in the second stage, the total reduction rate of the last three passes of the original rolling process is 40.44 percent, the optimization process is 36.01 percent, the rolling temperature is the same, the first stage is deformation of an austenite recrystallization zone, the second stage is rolling of an austenite non-recrystallization zone, the ferrite grain size of the steel obtained by the optimization process is larger, the ferrite grain should be properly coarsened on the basis of ensuring the strength and the toughness, the yield ratio can be reduced, the stability of the steel can be ensured, and the anti-seismic performance of the steel can be improved.
Description
Technical Field
The invention relates to the technical field of building steel, in particular to a preparation method of high-strength anti-seismic steel for buildings.
Background
In recent 20 years, the high-rise building industry in China has made great progress, and a large number of high-rise and super-high-rise buildings mainly comprising steel frameworks are emerged, so that the steel used is required to have high earthquake resistance in addition to high strength, high toughness and weldability required by general structural materials, and catastrophic consequences caused by a major earthquake once, so that people are forced to pay high attention to the earthquake resistance of the steel for the high-strength buildings.
In the rolling step of the existing steel, finer austenite grains are obtained by increasing the pass reduction, more positions are provided for austenite to ferrite deformation nuclei, and therefore ferrite grains are refined, in the deformation process of the non-recrystallization zone, the last three secondary deformation amounts are large, so that the ferrite grains are fine in size and fine, the yield strength can be increased, while the volume fraction and the lamella spacing as hard phase pearlite are the main causes affecting the tensile strength, when the lamellar spacing and the volume fraction of the pearlite are basically the same, the tensile strength is basically the same, therefore, the finer the ferrite grains are, the higher the yield strength is, and under the condition of basically the same tensile strength, the yield ratio is increased along with the finer the ferrite grains are, therefore, for the steel with higher yield ratio requirement, the ferrite grains are too fine to be good for the performance stability of the steel.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength anti-seismic steel for buildings, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a high-strength anti-seismic steel for buildings comprises the following steps:
the method comprises the following steps: heating the billet, wherein theoretically, the heating temperature of common steel is austenite homogenization temperature, and aims to reduce deformation resistance and compensate temperature reduction among working procedures, the heating temperature is above 1250 ℃, but the final performance is deteriorated due to the fact that the temperature is too high, the binding force of austenite grains can be weakened, and tissues are excessively coarsened, so that the heating temperature is about 1180 ℃, the heat preservation time in the furnace is above 3 hours, and the temperature difference of each part is ensured to be less than 20 ℃;
step two: rolling, wherein in the first stage, the average reduction rate of 12.42 percent is adopted to achieve a certain intermediate blank thickness, in the second stage, the total reduction rate of the final three passes of rolling in the finished product area is 36.01 percent, the final temperature of rolling is controlled to be above 950 ℃, and the intermediate blank thickness is about 2.5-4 times of the thickness of a finished product;
step three: and (3) performing controlled cooling on the austenite after the product is formed again, after the finish rolling process, conveying the steel out of the finish rolling mill to a steel controlled cooling system, performing air cooling on the steel through the controlled cooling system or performing controlled cooling on the steel according to the steel type and the corresponding process, and cooling the steel by the controlled cooling system at the corresponding water quantity and different cooling speeds.
Preferably, the steel is delivered by a roller way to directly enter an ACC device after being cast in the last pass of finished product rolling, when the steel passes through the ACC device, water is sprayed to the upper surface and the lower surface of the steel simultaneously for rapid cooling, so that the temperature of the steel is rapidly reduced to 600-650 ℃ (ACC controlled cooling) from about 700-800 ℃ (namely an austenite region or a bidirectional region), the steel with the thickness of more than 25mm passes through the ACC device at a speed of about 0.3-1.0 m/se; the passing speed of the steel with the thickness less than 25mm can reach 3.0m/sec at most.
Preferably, the austenite recrystallization zone is rolled by using a reduction ratio of each pass larger than the critical deformation ratio, and grains are continuously refined through recrystallization.
Preferably, when the steel is straightened, the straightening temperature is generally controlled to be over 600 ℃, and then the steel is slowly cooled between 600 ℃ and 400 ℃.
Preferably, the heating temperature is limited to an upper limit for a high-grade steel slab containing a microalloy element.
Preferably, the work hardened austenite after rolling of the non-recrystallized region undergoes a phase transformation at different cooling rates.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts a two-stage process in the process of rolling steel, in the first stage, the original rolling process adopts 14.58 percent of average reduction rate, the optimization process adopts 12.42 percent of average reduction rate to achieve the same intermediate billet thickness, in the second stage, the total reduction rate of the last three passes of the original rolling process is 40.44 percent, the optimization process is 36.01 percent, the rolling temperature is the same, the first stage is austenite recrystallization zone deformation, the second stage is austenite non-recrystallization zone rolling, the average grain size of the steel obtained by the original rolling process is larger than that of the steel obtained by the optimization process, the ferrite grain size of the steel obtained by the optimization process is larger, but the difference of the pearlite sheet spacing between the two is small, for the product with higher requirement on strength and toughness, the ferrite grain should be properly coarsened on the basis of ensuring the strength and the toughness, the yield ratio can be reduced, the stability of the steel is ensured, and the anti-seismic performance of the steel is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
Example 1
The invention provides a preparation method of a high-strength anti-seismic steel for buildings, which comprises the following steps:
the method comprises the following steps: heating the billet, wherein theoretically, the heating temperature of common steel is austenite homogenization temperature, and aims to reduce deformation resistance and compensate temperature reduction among working procedures, the heating temperature is above 1250 ℃, but the final performance is deteriorated due to the fact that the temperature is too high, the binding force of austenite grains can be weakened, and tissues are excessively coarsened, so that the heating temperature is about 1180 ℃, the heat preservation time in the furnace is above 3 hours, and the temperature difference of each part is ensured to be less than 20 ℃;
step two: rolling, wherein in the first stage, the average reduction rate of 12.42 percent is adopted to achieve a certain intermediate blank thickness, in the second stage, the total reduction rate of the final three passes of rolling in the finished product area is 36.01 percent, the final temperature of rolling is controlled to be above 950 ℃, and the intermediate blank thickness is about 2.5-4 times of the thickness of a finished product;
step three: and (3) performing controlled cooling on the austenite after the product is formed again, after the finish rolling process, conveying the steel out of the finish rolling mill to a steel controlled cooling system, performing air cooling on the steel through the controlled cooling system or performing controlled cooling on the steel according to the steel type and the corresponding process, and cooling the steel by the controlled cooling system at the corresponding water quantity and different cooling speeds.
In this embodiment, the average rolling reduction of 12.42% is adopted in the first stage of the rolling process, the total rolling reduction of the last three passes of the second stage is 36.01%, the first stage is deformation of an austenite recrystallization region, the second stage is rolling of an austenite non-recrystallization region, the average grain size of the steel obtained by the original rolling process is larger than that of the steel obtained by the optimization process, the ferrite grain size of the steel obtained by the optimization process is larger, but the difference between the two pearlite sheet distances is small, for the product with higher yield ratio requirement, the ferrite grains should be properly coarsened on the basis of ensuring the strength and the toughness, the yield ratio can be reduced, the stability of the steel is ensured, and the seismic performance of the steel is improved.
Example 2
After steel is cast in the last pass of finished product rolling, the steel is conveyed by a roller way and directly enters an ACC device, when the steel passes through the ACC device, water is sprayed on the upper surface and the lower surface of the steel simultaneously for rapid cooling, so that the temperature of the steel is rapidly reduced to 600-650 ℃ (ACC controlled cooling) from about 700-800 ℃ (namely an austenite region or a bidirectional region), the steel with the thickness of more than 25mm passes through the ACC device at the speed of about 0.3-1.0 m/see; the steel with the thickness less than 25mm can pass at the speed of 3.0m/sec, in the embodiment, the biggest difference of the controlled cooling process parameters is the cooling rate and the temperature range of forced cooling (cooling start temperature and cooling stop temperature), different cooling rates and temperature ranges of forced cooling have different influences on the microstructure of the steel in the rolling process and after the cooling process, and for the steel without accelerated cooling, water is not sprayed when the steel passes through an ACC device.
Example 3
When rolling in the austenite recrystallization region, the reduction rate of each pass is required to be larger than the critical deformation rate, and grains are refined continuously through recrystallization.
Example 4
When straightening steel, the straightening temperature is generally controlled to be above 600 ℃, and then the steel is slowly cooled at 600-400 ℃, in the embodiment, the straightening temperature is controlled to be 600 ℃, so that carbon in the steel and iron cable body is easy to precipitate, the aging tendency is avoided, cold bending mismatching is caused, and the impact toughness is reduced.
Example 5
In the present example, the heating temperature of the high-grade billet containing the microalloy element is set to the upper limit, and the high-grade billet containing the microalloy element is set to the upper limit, so that the alloy element can be sufficiently dissolved in the solid solution, and the subsequent delayed recrystallization temperature and precipitation strengthening effect can be exerted.
Example 6
The work-hardened austenite after rolling in the non-recrystallization region undergoes phase transformation at different cooling rates, and in the embodiment, the refined structure after the phase transformation improves the strength and the toughness, and can correspondingly reduce the carbon content and the alloy content, thereby improving the mechanical property of the steel and obviously improving the welding performance and the toughness of the welding part.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A preparation method of high-strength anti-seismic steel for buildings is characterized by comprising the following steps: the preparation method of the high-strength anti-seismic steel for the building comprises the following steps:
the method comprises the following steps: heating the billet, wherein theoretically, the heating temperature of common steel is austenite homogenization temperature, and aims to reduce deformation resistance and compensate temperature reduction among working procedures, the heating temperature is above 1250 ℃, but the final performance is deteriorated due to the fact that the temperature is too high, the binding force of austenite grains can be weakened, and tissues are excessively coarsened, so that the heating temperature is about 1180 ℃, the heat preservation time in the furnace is above 3 hours, and the temperature difference of each part is ensured to be less than 20 ℃;
step two: rolling, wherein in the first stage, the average reduction rate of 12.42 percent is adopted to achieve a certain intermediate blank thickness, in the second stage, the total reduction rate of the final three passes of rolling in the finished product area is 36.01 percent, the final temperature of rolling is controlled to be above 950 ℃, and the intermediate blank thickness is about 2.5-4 times of the thickness of a finished product;
step three: and (3) performing controlled cooling on the austenite after the product is formed again, after the finish rolling process, conveying the steel out of the finish rolling mill to a steel controlled cooling system, performing air cooling on the steel through the controlled cooling system or performing controlled cooling on the steel according to the steel type and the corresponding process, and cooling the steel by the controlled cooling system at the corresponding water quantity and different cooling speeds.
2. The method for preparing a high-strength earthquake-resistant steel material for construction according to claim 1, wherein: after steel is cast in the last pass of finished product rolling, the steel is conveyed by a roller way and directly enters an ACC device, when the steel passes through the ACC device, water is sprayed on the upper surface and the lower surface of the steel simultaneously for rapid cooling, so that the temperature of the steel is rapidly reduced to 600-650 ℃ (ACC controlled cooling) from about 700-800 ℃ (namely an austenite region or a bidirectional region), the steel with the thickness of more than 25mm passes through the ACC device at the speed of about 0.3-1.0 m/see; the passing speed of the steel with the thickness less than 25mm can reach 3.0m/sec at most.
3. The method for preparing a high-strength earthquake-resistant steel material for construction according to claim 1, wherein: when rolling in an austenite recrystallization zone, the reduction rate of each pass is required to be larger than the critical deformation rate, and grains are refined continuously through recrystallization.
4. The method for preparing a high-strength earthquake-resistant steel material for construction according to claim 1, wherein: if the steel is straightened, the straightening temperature is generally controlled to be over 600 ℃, and then the steel is slowly cooled between 600 ℃ and 400 ℃.
5. The method for preparing a high-strength earthquake-resistant steel material for construction according to claim 1, wherein: for high-grade steel billets containing microalloy elements, the heating temperature is limited to the upper limit.
6. The method for preparing a high-strength earthquake-resistant steel material for construction according to claim 1, wherein: work hardened austenite is transformed after rolling in the non-recrystallization zone at different cooling rates.
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| CN201911007968.6A CN110724805A (en) | 2019-10-22 | 2019-10-22 | Preparation method of high-strength anti-seismic steel for building |
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| CN201911007968.6A CN110724805A (en) | 2019-10-22 | 2019-10-22 | Preparation method of high-strength anti-seismic steel for building |
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| CN101323929A (en) * | 2007-06-14 | 2008-12-17 | 舞阳钢铁有限责任公司 | High strength steel plate for big thickness tall building structure and production method thereof |
| CN101260495A (en) * | 2008-04-17 | 2008-09-10 | 东北大学 | Method for manufacturing 590MPa stage low yield ratio low carbon equivalent weight steel plate for building |
| CN101613828A (en) * | 2009-07-16 | 2009-12-30 | 首钢总公司 | Super-thick steel plate for low yield ratio buildings with 460 MPa grade yield strength and manufacture method |
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Application publication date: 20200124 |