CN110586663A - Production method for reducing temperature drop of hot-rolled intermediate billet - Google Patents
Production method for reducing temperature drop of hot-rolled intermediate billet Download PDFInfo
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- CN110586663A CN110586663A CN201910834058.9A CN201910834058A CN110586663A CN 110586663 A CN110586663 A CN 110586663A CN 201910834058 A CN201910834058 A CN 201910834058A CN 110586663 A CN110586663 A CN 110586663A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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Abstract
The invention relates to a production method for reducing the temperature drop of a hot-rolled intermediate billet, wherein whether an R2 rolling mill finishes rolling is not judged before the first and second passes of steel feeding of an R1 rolling mill, the R1 rolling mill is adopted for rolling in advance, and the clearance time of the R1 rolling mill is 1-3 seconds; the water pressure of the roller body cooling water of the roller in the rough rolling area is controlled to be 0.8-1.0 MPa in summer and 0.6-0.8 MPa in winter; in the rough rolling process, the temperature difference between the middle part and the edge part of a plate blank is controlled to be 20-30 ℃; the water spraying at the inlet and outlet sides of the rolling mill is air spraying, and the temperature difference of the cross section is controlled within 20 ℃; the width abrasion of the water cutting plate resin strip of the rolling mill is not more than 20 mm. The advantages are that: the plate blank discharging temperature is reduced, the energy consumption is saved, the cost is reduced, and the rolling stability of the machine frame and the next procedure is improved.
Description
Technical Field
The invention belongs to the field of hot rolling process, and particularly relates to a production method for reducing the temperature drop of a hot-rolled intermediate billet.
Background
At present, the temperature of a rough rolling area of a saddle steel 1580 production line is greatly reduced, so that the plate blank discharging temperature is high, the furnace time is prolonged, the gas consumption is increased, and the cost is increased. The large temperature drop of the rough rolling area is mainly caused by the reasons of long rolling time, large water amount of side water spraying and cooling water, serious water leakage in a frame and the like, and particularly, the rough rolling outlet temperature is a main factor for restricting the normal production of a hot rolling production line when a product with a limit specification is produced. Therefore, the production method for reducing the temperature drop of the hot-rolled intermediate billet is developed for reducing the temperature drop of the rough rolling area, reducing the energy consumption and improving the rolling stability of finish rolling, and has great significance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a production method for reducing the temperature drop of a hot-rolled intermediate billet, reduce the tapping temperature of the slab, improve the rolling stability of the stand and the next procedure, save energy consumption and reduce cost.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method of reducing the temperature drop of a hot rolled intermediate slab comprising:
1) before the first and second passes of steel feeding of the R1 rolling mill, whether the rolling of the R2 rolling mill is finished or not is not judged, the R1 rolling mill is adopted for rolling in advance, and the clearance time of the R1 rolling mill is 1-3 seconds;
2) the water pressure of the roller body cooling water of the roller in the rough rolling area is controlled to be 0.8-1.0 MPa in summer and 0.6-0.8 MPa in winter;
3) in the rough rolling process, the temperature difference between the middle part and the edge part of a plate blank is controlled to be 20-30 ℃;
4) the water spraying at the inlet and outlet sides of the rolling mill is air spraying, and the temperature difference of the cross section is controlled within 20 ℃;
5) the width abrasion of the water cutting plate resin strip of the rolling mill is not more than 20 mm.
Compared with the prior art, the invention has the beneficial effects that:
the production method for reducing the temperature drop of the hot-rolled intermediate billet reduces the tapping temperature of the slab, saves energy consumption, reduces cost and improves the rolling stability of the stand and the next working procedure; the temperature drop of the rough rolling area is reduced by 20-30 ℃ on the basis of the original temperature drop (the original temperature drop is 180-200 ℃) until the temperature drop of the rough rolling area is within 150-180 ℃. By adopting the method, the rolling time of rough rolling is greatly reduced, each piece of steel is reduced by 5-10 seconds on average, the temperature drop of a rough rolling outlet is reduced by 20-30 ℃, the effect is obvious, and the rolling stability of finish rolling is improved; greatly reducing the temperature drop of the edge of the plate blank to 30-50 ℃, wherein the temperature difference between the middle part and the edge of the plate blank is 20-30 ℃; the edge defect rate is reduced from 1.48% to 0.63%, the reduction range reaches 57.43%, and the workload of the subsequent process is effectively reduced; and no steel clamping accident occurs after the method is adopted.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A method of reducing the temperature drop of a hot rolled intermediate slab comprising:
1) optimizing the rolling rhythm of the rough rolling area: the rough rolling area of the hot rolling line consists of a width fixing machine, an R1 rolling mill and an R2 rolling mill, whether the R2 rolling mill finishes rolling or not is not judged before the first and second passes of steel feeding of the R1 rolling mill, the R1 rolling mill is adopted for rolling in advance, and the clearance time of the R1 rolling mill is 1-3 seconds; the rolling speed of the R1 and R2 rolling mills is increased, the pure rolling time is reduced, and the total rolling time of a rough rolling area is shortened to 3-4 minutes from 5-6 minutes.
2) The water pressure of the roller body cooling water of the roller in the rough rolling area is controlled to be 0.8-1.0 MPa in summer and 0.6-0.8 MPa in winter; on the premise of ensuring that the cooling of the roller is satisfied, the influence of the cooling water of the roller on the temperature drop of the intermediate blank is reduced.
3) The water baffle of the vertical roll is added, the Chinese patent application No. CN201821624213.1 discloses a rough rolling vertical roll water baffle device, because the water pressure and the water quantity of the vertical roll body are larger, the influence on the temperature drop of the edge of a plate blank is larger, after the water baffle of the vertical roll is added, the temperature difference between the middle of the plate blank and the edge is controlled at 20-30 ℃ in the rough rolling process.
4) The water spraying at the inlet and outlet sides of the rolling mill is air spraying, the temperature difference of the cross section is controlled within 20 ℃, the temperature difference of the cross section of the intermediate billet is greatly reduced, and the temperature drop of the intermediate billet is reduced.
5) The water cutting plate resin strip is a cuboid and is arranged on the guide position in the length direction, the width abrasion of the water cutting plate resin strip of the rolling mill does not exceed 20mm, the water cutting plate resin strip of the rolling mill is replaced when the width abrasion is more than 20mm, and the water leakage after the machine is operated is ensured. Meanwhile, the measurement difference of two sides of the cut water plate resin strip is smaller than 6mm (single-side abrasion is avoided being too large), and the cut water plate resin strip is enabled to be well attached to the roller without water leakage.
Example (b):
1. the rough rolling area of the hot rolling line consists of a width fixing machine, R1 and R2 rolling mills, whether the R2 rolling mill finishes rolling or not is not judged before the first and second passes of steel feeding of the R1 rolling mill, the R1 rolling mill is adopted for rolling in advance, the clearance time of the R1 rolling mill is 1-3 seconds, the rolling speeds of R1 and R2 are increased, and the rolling speed of each pass is increased by 0.3-0.8 m/s on the basis of the rolling speed set by the original second-level digifax; (for example, the rolling speeds of the R1 three passes are respectively 1.0 m/s, 1.44 m/s and 1.76 m/s, and are respectively increased to 1.5 m/s, 1.8 m/s and 2.0 m/s; and the rolling speeds of the R2 three passes are respectively 2.7 m/s, 3.2 m/s and 4.0 m/s, and are respectively increased to 3.3 m/s, 4.0 m/s and 4.5 m/s).
2. In summer, the water pressure and the water quantity of the cooling water of the roller body are controlled to be 0.8-1.0 MPa; the water pressure and the water quantity of the cooling water of the roller body are 0.6-0.8 MPa in winter;
3. e1 and E2 vertical roll breakwaters are added. The temperature difference between the edge of the rough rolling outlet plate blank and the middle of the rough rolling outlet plate blank is reduced by 30-50 ℃ to reach 20-30 ℃;
4. the water spraying of the inlet and outlet sides of the rolling mill is changed into air spraying. The temperature drop of the rough rolling outlet is reduced by 10-20 ℃;
5. the thickness abrasion of the water cutting plate resin strip of the rolling mill is not more than 20mm, and the water cutting plate resin strip of the rolling mill is replaced when the thickness abrasion is more than 20mm, so that the water leakage after the rolling mill is operated is ensured.
Claims (1)
1. A production method for reducing the temperature drop of a hot-rolled intermediate billet is characterized by comprising the following steps:
1) before the first and second passes of steel feeding of the R1 rolling mill, whether the rolling of the R2 rolling mill is finished or not is not judged, the R1 rolling mill is adopted for rolling in advance, and the clearance time of the R1 rolling mill is 1-3 seconds;
2) the water pressure of the roller body cooling water of the roller in the rough rolling area is controlled to be 0.8-1.0 MPa in summer and 0.6-0.8 MPa in winter;
3) in the rough rolling process, the temperature difference between the middle part and the edge part of a plate blank is controlled to be 20-30 ℃;
4) the water spraying at the inlet and outlet sides of the rolling mill is air spraying, and the temperature difference of the cross section is controlled within 20 ℃;
5) the width abrasion of the water cutting plate resin strip of the rolling mill is not more than 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910834058.9A CN110586663A (en) | 2019-09-04 | 2019-09-04 | Production method for reducing temperature drop of hot-rolled intermediate billet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910834058.9A CN110586663A (en) | 2019-09-04 | 2019-09-04 | Production method for reducing temperature drop of hot-rolled intermediate billet |
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| CN110586663A true CN110586663A (en) | 2019-12-20 |
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| CN201910834058.9A Pending CN110586663A (en) | 2019-09-04 | 2019-09-04 | Production method for reducing temperature drop of hot-rolled intermediate billet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309079A (en) * | 2021-11-25 | 2022-04-12 | 邯郸钢铁集团有限责任公司 | Automatic control method for efficient production of rough rolling area |
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| CN105710135A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Free rolling control method for rough rolling double-rolling mill |
| CN206184921U (en) * | 2016-09-26 | 2017-05-24 | 南京钢铁股份有限公司 | Water retaining device of narrow strip production control rolled piece temperature drop |
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| CN108941213A (en) * | 2018-06-25 | 2018-12-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Control the milling method of high tensile hot rolled steel sheet structural homogenity |
| CN109174981A (en) * | 2018-08-31 | 2019-01-11 | 东北大学 | A kind of hot continuous rolling intermediate blank cooling device and its application method |
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| CN105478472A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hot rolling method of wide and thin high-strength cold-rolled substrate for automobile |
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| CN209020947U (en) * | 2018-10-08 | 2019-06-25 | 鞍钢股份有限公司 | Roughing edger roll breakwater device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309079A (en) * | 2021-11-25 | 2022-04-12 | 邯郸钢铁集团有限责任公司 | Automatic control method for efficient production of rough rolling area |
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Application publication date: 20191220 |
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