CN110616299A - Production method of high-strength steel - Google Patents
Production method of high-strength steel Download PDFInfo
- Publication number
- CN110616299A CN110616299A CN201810631490.3A CN201810631490A CN110616299A CN 110616299 A CN110616299 A CN 110616299A CN 201810631490 A CN201810631490 A CN 201810631490A CN 110616299 A CN110616299 A CN 110616299A
- Authority
- CN
- China
- Prior art keywords
- steel
- heat preservation
- cold rolling
- hot
- coils
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
-
- 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
Abstract
A production method of high-strength steel comprises the steps of carrying out hot rolling, coiling, bundling and on-line heat preservation on a plate blank, then directly carrying out cold rolling, and carrying out cold rolling to obtain a high-strength steel cold-rolled plate; wherein the hot rolling finishing temperature is controlled to be 880-950 ℃, and the coiling temperature is controlled to be 450-700 ℃; the bundled steel coils are directly transferred to a cold rolling mill group through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, an insulation cover is adopted to carry out online insulation or heating treatment on the steel coils, and the annealing tempering is directly completed by utilizing the waste heat of hot coils; the temperature range in the heat preservation cover is 450-680 ℃, the online heat preservation time is 1-24 hours, the steel coil is continuously heated or cooled in the heat preservation cover, and after the heat preservation is finished, the steel coil is cooled to the room temperature in an air cooling mode and is conveyed to a cold rolling unit. The production method of the high-strength steel cancels the common process mode of bell-type furnace annealing in the prior art, and has the advantages of high efficiency, energy conservation, shortened manufacturing period and the like.
Description
Technical Field
The invention relates to a hot rolling process, in particular to a production method of high-strength steel.
Background
With the development trend of market demand of thinning and high strengthening of high-strength steel, the strength level of the high-strength steel is gradually increased from the conventional tensile strength of 500-600 MPa to 800-1200 MPa, and a difficult problem which troubles the cold and hot rolling process appears. Due to the fact that the strength of the material is too high, the rolling force of a cold rolling mill is too large, safe and stable production cannot be achieved, the material has to be softened by adopting a hot coil through a cold rolling bell-type furnace annealing process, and the cold rolling force is reduced.
However, the processing pattern (as shown in fig. 1) of softening the hot coil by the cold rolling bell type furnace increases the manufacturing cycle, greatly increases the production cost, increases the energy consumption (gas consumption) of production, and is not friendly to the surrounding environment.
Disclosure of Invention
The invention aims to provide a production method of high-strength steel, which cancels the common process mode of bell-type furnace annealing in the prior art and has the advantages of high efficiency, energy conservation, shortened manufacturing period and the like.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a production method of high-strength steel comprises the steps of carrying out hot rolling, coiling, bundling and on-line heat preservation on a plate blank, then directly carrying out cold rolling, and carrying out cold rolling to obtain a high-strength steel cold-rolled plate; wherein the hot rolling finishing temperature is controlled to be 880-950 ℃, and the coiling temperature is controlled to be 450-700 ℃; the bundled steel coils are directly transferred to a cold rolling mill group through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, an insulation cover is adopted to carry out online insulation or heating treatment on the steel coils, and the annealing tempering is directly completed by utilizing the waste heat of hot coils; the temperature range in the heat preservation cover is 450-680 ℃, the online heat preservation time is 1-24 hours, the steel coil is continuously heated or cooled in the heat preservation cover, and after the heat preservation is finished, the steel coil is cooled to the room temperature in an air cooling mode and is conveyed to a cold rolling unit.
Preferably, an electric heating device and a temperature sensor are arranged in the heat-preserving cover.
In the existing production mode of high-strength steel, a high-strength steel hot coil is softened in a cold rolling bell-type furnace mode, although the effect of reducing the strength is achieved, and the cold rolling stability is improved, the production mode increases a large amount of manufacturing cost and manufacturing period. Hot coils need to be hot rolled and leveled firstly to ensure the coil shape quality required by the cold rolling bell-type furnace; the cold rolling bell-type furnace anneals the rolled hard coil after the cold rolling and the acid rolling, but aiming at high-strength steel products, a production mode that the hot coil is annealed by the bell-type furnace has to be adopted, the hot coil is transported to a bell-type furnace hearth, and the hot coil is transported to a front warehouse of the cold rolling and the acid rolling after annealing, so that the process is complex and tedious.
The invention realizes the adjustment (performance strengthening or softening) of the hot coil material by a mode of combining 'hot coil waste heat utilization' and 'online heat treatment'.
The invention fully utilizes the waste heat of the hot coil after coiling, and simultaneously adopts an on-line heat treatment process to directly finish annealing and tempering on a conveying chain for conveying the steel coil, thereby greatly shortening the manufacturing period of hot rolling-cold rolling and acid rolling.
In the method, the hot rolling finishing temperature is controlled to be 880-950 ℃, and the finish rolling temperature is increased to reduce the finish rolling force; controlling the coiling temperature at 450-680 ℃ to obtain a corresponding hot-rolled metallographic structure; the on-line heat preservation (or heating) temperature is 450-700 ℃, and the heat preservation is carried out for 1-24 hours, so that the effects of softening the hot coil strength and homogenizing the tissues are achieved.
The invention has the beneficial effects that:
the invention adopts a high-temperature hot coil on-line heat treatment mode to replace a cold rolling bell-type furnace annealing process, realizes the purposes of shortening the manufacturing flow, reducing the production energy consumption and reducing the processing cost, has feasibility in the production process, and belongs to a low-cost manufacturing mode for high-strength steel hot rolling production.
Drawings
FIG. 1 is a schematic diagram of bell-type furnace annealing in a conventional production mode of high-strength steel.
FIG. 2 is a schematic temperature diagram of the "in-line heat treatment" of the present invention.
Detailed Description
Referring to fig. 2, in the production method of the high-strength steel, the plate blank is directly sent for cold rolling after hot rolling, reeling, bundling and online heat preservation, and the high-strength steel cold-rolled plate is obtained through cold rolling; wherein the hot rolling finishing temperature is controlled to be 880-950 ℃, and the coiling temperature is controlled to be 450-700 ℃; the bundled steel coils are directly transferred to a cold rolling mill group through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, an insulation cover is adopted to carry out online insulation or heating treatment on the steel coils, and the annealing tempering is directly completed by utilizing the waste heat of hot coils; the temperature range in the heat preservation cover is 450-680 ℃, the online heat preservation time is 1-24 hours, the steel coil is continuously heated or cooled in the heat preservation cover, and after the heat preservation is finished, the steel coil is cooled to the room temperature in an air cooling mode and is conveyed to a cold rolling unit.
The invention realizes the adjustment (performance strengthening or softening) of the hot coil material by a mode of combining the 'hot coil waste heat utilization' and the 'on-line heat treatment', and simultaneously adopts the 'on-line heat treatment process' to directly finish annealing and tempering on a conveying chain for conveying steel coils, thereby greatly shortening the manufacturing period of 'hot rolling-cold rolling and acid rolling'.
Claims (2)
1. A production method of high-strength steel is characterized in that a plate blank is directly sent for cold rolling after hot rolling, coiling, bundling and online heat preservation, and a high-strength steel cold-rolled plate is obtained through cold rolling; wherein the hot rolling finishing temperature is controlled to be 880-950 ℃, and the coiling temperature is controlled to be 450-700 ℃; the bundled steel coils are directly transferred to a cold rolling mill group through a steel coil conveying chain or a moving trolley, in the steel coil conveying process, an insulation cover is adopted to carry out online insulation or heating treatment on the steel coils, and the annealing tempering is directly completed by utilizing the waste heat of hot coils; the temperature range in the heat preservation cover is 450-680 ℃, the online heat preservation time is 1-24 hours, the steel coil is continuously heated or cooled in the heat preservation cover, and after the heat preservation is finished, the steel coil is cooled to the room temperature in an air cooling mode and is conveyed to a cold rolling unit.
2. The method for producing high strength steel according to claim 1, wherein an electric heating device and a temperature sensor are provided in the heat-insulating cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810631490.3A CN110616299A (en) | 2018-06-19 | 2018-06-19 | Production method of high-strength steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810631490.3A CN110616299A (en) | 2018-06-19 | 2018-06-19 | Production method of high-strength steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110616299A true CN110616299A (en) | 2019-12-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810631490.3A Pending CN110616299A (en) | 2018-06-19 | 2018-06-19 | Production method of high-strength steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110616299A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114196810A (en) * | 2020-09-17 | 2022-03-18 | 宝山钢铁股份有限公司 | High-strength steel coil dehydrogenation method |
| CN114214485A (en) * | 2021-11-29 | 2022-03-22 | 辽宁石源科技有限公司 | One-fire hot charging heat treatment process for ferrite stainless steel hot-rolled plate |
Citations (7)
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| EP2162557B1 (en) * | 2007-06-22 | 2011-04-06 | SMS Siemag AG | Process for hot rolling and for heat treatment of a steel strip |
| CN102400037A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Ultra high strength steel strip for package, and preparation method thereof |
| CN102851464A (en) * | 2012-09-22 | 2013-01-02 | 山东泰山钢铁集团有限公司 | Annealing technique of SUS410S martensitic stainless steel hot-rolled plate |
| WO2016059101A1 (en) * | 2014-10-15 | 2016-04-21 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process related applications |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
| CN107470377A (en) * | 2017-09-20 | 2017-12-15 | 上海贺力液压机电有限公司 | Steel band manufacture streamline is incubated annealing device online |
| CN108085603A (en) * | 2018-01-29 | 2018-05-29 | 东北大学 | A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting |
-
2018
- 2018-06-19 CN CN201810631490.3A patent/CN110616299A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2162557B1 (en) * | 2007-06-22 | 2011-04-06 | SMS Siemag AG | Process for hot rolling and for heat treatment of a steel strip |
| CN102400037A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | Ultra high strength steel strip for package, and preparation method thereof |
| CN102851464A (en) * | 2012-09-22 | 2013-01-02 | 山东泰山钢铁集团有限公司 | Annealing technique of SUS410S martensitic stainless steel hot-rolled plate |
| WO2016059101A1 (en) * | 2014-10-15 | 2016-04-21 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process related applications |
| US20170283903A1 (en) * | 2014-10-15 | 2017-10-05 | Sms Group Gmbh | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process |
| CN107470377A (en) * | 2017-09-20 | 2017-12-15 | 上海贺力液压机电有限公司 | Steel band manufacture streamline is incubated annealing device online |
| CN108085603A (en) * | 2018-01-29 | 2018-05-29 | 东北大学 | A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114196810A (en) * | 2020-09-17 | 2022-03-18 | 宝山钢铁股份有限公司 | High-strength steel coil dehydrogenation method |
| CN114196810B (en) * | 2020-09-17 | 2024-03-08 | 宝山钢铁股份有限公司 | Method for removing hydrogen from high-strength steel coil |
| CN114214485A (en) * | 2021-11-29 | 2022-03-22 | 辽宁石源科技有限公司 | One-fire hot charging heat treatment process for ferrite stainless steel hot-rolled plate |
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Application publication date: 20191227 |