CN110616306A - Hot rolling on-line mobile heat preservation heat treatment process - Google Patents
Hot rolling on-line mobile heat preservation heat treatment process Download PDFInfo
- Publication number
- CN110616306A CN110616306A CN201810632237.XA CN201810632237A CN110616306A CN 110616306 A CN110616306 A CN 110616306A CN 201810632237 A CN201810632237 A CN 201810632237A CN 110616306 A CN110616306 A CN 110616306A
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- CN
- China
- Prior art keywords
- heat preservation
- hot
- heat treatment
- heat
- hot coil
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/84—Controlled slow cooling
-
- 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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
Abstract
A hot rolling on-line mobile heat preservation heat treatment process comprises the steps that a plate blank is heated, rolled, layered cooled and coiled to a hot coil state, an on-line mobile heat preservation device is additionally arranged on the hot coil within 30min after the hot coil is unloaded and bundled, the hot coil starts to be subjected to heat treatment, and meanwhile, the hot coil is transported to a hot coil heat preservation treatment area on line; after the heat treatment time is 1-48 h, cooling in an air cooling mode, and then conveying the steel coil into a warehouse; wherein the coiling temperature is controlled between 250 ℃ and 750 ℃. The hot rolling on-line moving heat preservation heat treatment process effectively combines the temperature of the hot coil coiling process, the hot coil is subjected to efficient heat preservation heat treatment at the first time, the heat preservation treated hot coil moves on line along with the heat preservation device, the differentiated heat treatment process requirements are ensured, the product performance can be effectively improved, the one-time investment is low, the high-rhythm large production requirements are met, and the energy is saved.
Description
Technical Field
The invention relates to a hot rolling and heat treatment process, in particular to a hot rolling on-line mobile heat preservation heat treatment process.
Background
Due to the complex component design and strengthening mechanism of hot-rolled and cold-rolled high-strength steel, when the traditional hot-rolling process is used for production, the properties of finished products are affected by uneven cooling and too fast cooling in the rolling process or after coiling, so that the problems of band steel property fluctuation, plate shape degradation and the like are caused. In order to solve the problem, the method is generally improved by adopting a mode of centralized heat preservation and slow cooling (a heat preservation wall, a heat preservation pit and the like) or off-line heat treatment (a roller hearth furnace, a bell furnace and the like) after hot coil coiling is put into a hot rolling finishing warehouse, but the problems of increased manufacturing cost, prolonged manufacturing period and the like are caused, and the aims of improving the performance and the plate shape quality cannot be completely achieved by a partial mode.
The conventional hot coil post-heat treatment mode comprises the following steps:
1) after hot coiling, putting the coil into a finishing warehouse, and performing slow cooling treatment by adopting a heat preservation pit or a heat preservation wall;
2) after hot coiling, putting the coiled material into a finishing warehouse, after intensively stacking and slowly cooling, cutting the coiled material through a decoiler unit, and then tempering the coiled material through a roller hearth furnace;
3) and (4) cold rolling the hot coil, and annealing the hot coil by using a cold rolling bell-type furnace.
The original process flow is as follows: heating, rolling, layer cooling, coiling and offline heat treatment (a heat preservation pit or a heat treatment furnace and the like).
The prior art has the following disadvantages:
after the hot coil is coiled, the hot coil is put into a finishing warehouse, a heat preservation pit or a heat preservation wall slow cooling treatment mode is adopted, the time from coiling the hot coil to warehousing is usually about 30-120 minutes, the cooling rate of the hot coil in an air cooling state in the process is high, uneven cooling of the inner ring, the outer ring and the middle edge of the strip steel occurs, and the heat source heating is not carried out in the heat preservation pit or the heat preservation wall, so that the improvement of the performance and the plate shape quality of the strip steel by the actual slow cooling treatment is very limited;
the roller hearth furnace tempering treatment or the bell-type furnace annealing treatment is adopted, the homogenization heat treatment of the strip steel can be realized, but the one-time investment of the project is huge, the strip steel needs to be heated again, the manufacturing cost is obviously increased, and the manufacturing period of the product is prolonged.
At present, other steel mills at home and abroad usually adopt a mode of centralized heat preservation and slow cooling (a heat preservation wall or a heat preservation pit and the like) or off-line heat treatment (a roller hearth furnace or a bell furnace and the like) in a hot rolling finishing warehouse to treat hot coils. In addition, a semi-closed tunnel type heat preservation technology adopting a conveying chain or a heat preservation technology adopting a vertical conveying mode is adopted. However, the technology has the defects of insufficient steel coil heat preservation treatment time, poor heat preservation effect and the like under the condition of large production, and the practical application difficulty is very high.
Disclosure of Invention
The invention aims to provide an online mobile heat-preservation heat treatment process for hot rolling, which effectively combines the temperature of a hot coil coiling process, carries out efficient heat-preservation heat treatment on a hot coil at the first time, ensures that differentiated heat treatment process requirements are realized by the online movement of the heat coil subjected to heat preservation treatment along with a heat preservation device, can effectively improve the product performance, has low one-time investment, meets the high-rhythm large production requirements, and saves energy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a hot rolling on-line mobile heat preservation heat treatment process comprises the steps that a plate blank is heated, rolled, layered cooled and coiled to a hot coil state, an on-line mobile heat preservation device is additionally arranged on the hot coil within 30min after the hot coil is unloaded and bundled, the hot coil starts to be subjected to heat treatment, and meanwhile, the hot coil is transported to a hot coil heat preservation treatment area on line; after the heat treatment time is 1-48 h, cooling in an air cooling mode, and then conveying the steel coil into a warehouse; wherein the coiling temperature is controlled between 250 ℃ and 750 ℃.
Preferably, the on-line movable heat preservation device is additionally arranged on the hot coil within 10min after the coiling is finished.
Preferably, the on-line mobile heat preservation device is a transport trolley with a heat preservation cover.
Preferably, the natural temperature drop rate in the on-line mobile heat preservation device is 1-10 ℃/h.
Preferably, a heating and/or vacuumizing or/and inert gas filling system is arranged in the on-line mobile heat preservation device.
The traditional hot-rolled and cold-rolled high-strength steel mostly adopts strengthening mechanisms such as solid solution strengthening, fine grain strengthening, phase change strengthening, precipitation strengthening and the like to meet the requirements of structural properties, the component design and the TMCP process are complex, the strength property and the property uniformity after coiling have a great relationship with the maintenance and uniform cooling of the hot coil temperature, and the fluctuation of the property in the full length direction or the width direction generally exists after coiling in the natural cooling process. In order to substantially improve the problems, the currently feasible method is to adopt an off-line heat treatment mode, after the hot coil is cooled, the hot coil is heated to a certain process temperature and then is subjected to heat preservation treatment, and the performance of the product is improved through a tempering or annealing process.
The temperature of the hot rolling and cold rolling high-strength steel hot rolling coiling process is usually 250-750 ℃, the temperature range is the same as that of the off-line heat treatment process, the technical route can realize the on-line heat treatment of a hot coil at a reasonable process temperature through heat preservation process equipment before the hot coil is naturally cooled through accurately controlling the coiling temperature, the tempering or annealing heat treatment of the hot coil is realized through heat preservation treatment for a certain time, the process treatment effect is equal to that of the off-line heat treatment, but compared with the off-line heat treatment, the equipment investment and the energy consumption are saved, and the green sustainable heat treatment process is realized.
The invention has the beneficial effects that:
the hot rolling on-line moving heat preservation heat treatment process provided by the invention has the advantages that the hot coil is coiled and then directly subjected to on-line moving heat treatment through the heat preservation device, so that the traditional off-line heat treatment is replaced, and the purposes of improving the product performance and the plate shape quality, saving energy and reducing consumption are achieved.
The hot-rolled and cold-rolled high-strength steel hot coil 'on-line mode' heat preservation heat treatment avoids the influence of air cooling after coiling on the performance of the steel coil, and realizes the improvement of the performance of the hot-rolled and cold-rolled high-strength steel.
Drawings
Fig. 1 and 2 are schematic diagrams illustrating the influence of on-line mobile heat preservation on the performance of a steel coil.
Detailed Description
The invention relates to a hot rolling on-line mobile heat preservation heat treatment process, which is characterized in that a plate blank is heated, rolled, cooled in a layer and coiled to a hot coil state, an on-line mobile heat preservation device is added to the hot coil within 30min after the hot coil is unloaded and bundled, the hot coil is subjected to heat treatment, and meanwhile, the hot coil is transported to a hot coil heat preservation treatment area on line; after the heat treatment time is 1-48 h, cooling in an air cooling mode, and then conveying the steel coil into a warehouse; wherein the coiling temperature is controlled between 250 ℃ and 750 ℃.
Preferably, the on-line movable heat preservation device is additionally arranged on the hot coil within 10min after the coiling is finished.
Preferably, the on-line mobile heat preservation device is a transport trolley with a heat preservation cover.
Preferably, the natural temperature drop rate in the on-line mobile heat preservation device is 1-10 ℃/h.
Preferably, a heating and/or vacuumizing or/and inert gas filling system is arranged in the on-line mobile heat preservation device.
Referring to fig. 1 and 2, the invention avoids the influence of air cooling after coiling on the performance of the steel coil by the 'online mode' heat preservation heat treatment of hot rolling and cold rolling of the high-strength steel hot coil, and realizes the improvement of the performance of the hot rolling and cold rolling of the high-strength steel.
Claims (5)
1. A hot rolling on-line mobile heat preservation heat treatment process is characterized in that a plate blank is heated, rolled, cooled in a layer mode and coiled to a hot coil state, an on-line mobile heat preservation device is added to the hot coil within 30min after the hot coil is removed from the coil and bundled, the hot coil is subjected to heat treatment, and meanwhile the hot coil is transported to a hot coil heat preservation treatment area on line; after the heat treatment time is 1-48 h, cooling in an air cooling mode, and then conveying the steel coil into a warehouse; wherein the coiling temperature is controlled between 250 ℃ and 750 ℃.
2. The hot rolling on-line mobile heat preservation heat treatment process as claimed in claim 1, characterized in that an on-line mobile heat preservation device is added to the hot coil within 10min after the completion of the coiling.
3. The hot rolling on-line mobile heat-preservation heat treatment process as claimed in claim 1, wherein the on-line mobile heat-preservation device is a transport trolley with a heat-preservation cover.
4. The hot rolling on-line mobile heat-preservation heat treatment process as claimed in claim 1, wherein the natural temperature drop rate in the on-line mobile heat-preservation device is 1-10 ℃/h.
5. The hot rolling on-line mobile heat-preservation treatment process as claimed in claim 1, 2 or 3, characterized in that a heating and/or vacuumizing and/or inert gas charging system is arranged in the on-line mobile heat-preservation device.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632237.XA CN110616306A (en) | 2018-06-19 | 2018-06-19 | Hot rolling on-line mobile heat preservation heat treatment process |
| PCT/CN2018/106709 WO2019057116A1 (en) | 2017-09-20 | 2018-09-20 | Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line |
| KR1020207010727A KR20200066630A (en) | 2017-09-20 | 2018-09-20 | Hot rolling online mobile heat insulation heat treatment process, and heat treatment line |
| EP18859703.3A EP3685931B1 (en) | 2017-09-20 | 2018-09-20 | Hot-rolling online movable thermal insulation heat treatment process, and heat treatment line |
| JP2020537826A JP7253558B2 (en) | 2017-09-20 | 2018-09-20 | Hot rolling in-line moving thermal insulation heat treatment process and heat treatment line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810632237.XA CN110616306A (en) | 2018-06-19 | 2018-06-19 | Hot rolling on-line mobile heat preservation heat treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110616306A true CN110616306A (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810632237.XA Pending CN110616306A (en) | 2017-09-20 | 2018-06-19 | Hot rolling on-line mobile heat preservation heat treatment process |
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| Country | Link |
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| CN (1) | CN110616306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085970A (en) * | 2021-11-16 | 2022-02-25 | 鞍钢联众(广州)不锈钢有限公司 | Manufacturing method for overcoming hot-rolled soft and hard edges of ferritic stainless steel |
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| CN103057842A (en) * | 2013-01-15 | 2013-04-24 | 无锡亚中智能装备有限公司 | Vehicle-mounted silicon steel coil thermostat |
| CN203497055U (en) * | 2013-09-23 | 2014-03-26 | 上海宝冶集团有限公司 | Bidirectional thermal-insulation trailer |
| CN105642670A (en) * | 2016-01-10 | 2016-06-08 | 东北大学 | Coiling type warm-rolling device and method for high-silicon steel |
| 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 |
| WO2018086762A1 (en) * | 2016-11-10 | 2018-05-17 | Sms Group Gmbh | Method for producing a metal strip in a cast-rolling installation |
-
2018
- 2018-06-19 CN CN201810632237.XA patent/CN110616306A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103057842A (en) * | 2013-01-15 | 2013-04-24 | 无锡亚中智能装备有限公司 | Vehicle-mounted silicon steel coil thermostat |
| CN203497055U (en) * | 2013-09-23 | 2014-03-26 | 上海宝冶集团有限公司 | Bidirectional thermal-insulation trailer |
| 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 |
| CN105642670A (en) * | 2016-01-10 | 2016-06-08 | 东北大学 | Coiling type warm-rolling device and method for high-silicon steel |
| WO2018086762A1 (en) * | 2016-11-10 | 2018-05-17 | Sms Group Gmbh | Method for producing a metal strip in a cast-rolling installation |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085970A (en) * | 2021-11-16 | 2022-02-25 | 鞍钢联众(广州)不锈钢有限公司 | Manufacturing method for overcoming hot-rolled soft and hard edges of ferritic stainless steel |
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Application publication date: 20191227 |