CN114042752A - Treatment process of large-thickness small-size blank and application thereof - Google Patents
Treatment process of large-thickness small-size blank and application thereof Download PDFInfo
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- CN114042752A CN114042752A CN202111329451.6A CN202111329451A CN114042752A CN 114042752 A CN114042752 A CN 114042752A CN 202111329451 A CN202111329451 A CN 202111329451A CN 114042752 A CN114042752 A CN 114042752A
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- blank
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005096 rolling process Methods 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000002791 soaking Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000009749 continuous casting Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Abstract
The invention relates to the technical field of steel smelting, in particular to a treatment process of a large-thickness small-size blank and application thereof. The large-thickness small-size blank is a blank with the thickness of more than or equal to 400mm and the length-thickness ratio of less than or equal to 5, and the treatment process comprises the following steps: (1) heating: controlling the temperature difference between the upper surface and the lower surface of the blank when the blank is discharged from the furnace to be +10 to +50 ℃; (2) rolling: the linear velocity ratio of the upper and lower rolls is controlled to be +1.05 to +1.13 in the roll biting stage. The treatment process can be used for producing super-thick steel plates. The invention controls the heating and rolling processes of the large-thickness small-size blank, so that the blank is always kept in a straight or slightly buckled and tilted state in the rolling process, thereby ensuring the smooth rolling process.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a treatment process of a large-thickness small-size blank and application thereof.
Background
In recent years, the demand of high-quality super-thick steel plates is increasing in the fields of major technical equipment such as maritime industry, thermal power, hydroelectric power, nuclear power, wind power and heavy machinery. In order to ensure that the performance of the super-thick plate meets the relevant standards and the use requirements of customers, the rolling compression ratio of the super-thick steel plate is increased by rolling large-thickness blanks such as large-section continuous casting blanks, large steel ingots or composite blanks and the like at home and abroad at present, so that various quality performances of the final super-thick steel plate product are ensured.
In order to protect equipment and ensure smooth rolling production, the head and the tail of a rolled piece (steel plate) are slightly tilted in the steel plate rolling process by adopting a sled rolling technology so as to avoid that the head of the rolled piece is knocked (buckled down) after the head of the rolled piece comes out of a roll gap and seriously impacts pipeline equipment or directly drills into the lower part of a rack roll. The ultra-thick blank is usually rolled by adopting a large reduction rolling process, the rolling compression ratio is large, the reduction passes are many, the temperature reduction rate difference of the ultra-thick rolled piece in the thickness direction in the whole rolling process is large, and the rolled piece can be tilted more easily in the rolling process. Particularly, for large-thickness and small-size blanks (specifically, blanks with the thickness of more than 400mm and the length-thickness ratio of less than 5 times), because the size of a rolled piece is small, the steel passing displacement and the time of rolling are relatively short, the straightness of the rolled piece in the rolling process is more difficult to control, and the average curvature radius of the head and the tail of the rolled piece is smaller than that of the large-size rolled piece, namely, the influence degree of the warping is more obvious, the rolled piece can not be continuously bitten into the rolling process in serious cases or production accidents such as roll winding and the like are directly caused due to the serious upwarp of the head of the rolled piece after the rolled piece goes out of a roll gap, so that the production is interrupted.
Based on this, it is necessary to provide a processing technique for large-thickness small-size blanks.
Disclosure of Invention
The invention provides a processing technology of a large-thickness small-size blank and application thereof, aiming at the technical problem that the flatness is difficult to control in the rolling process of the large-thickness small-size blank.
In a first aspect, the invention provides a treatment process for a large-thickness small-size blank, wherein the large-thickness small-size blank is a blank with the thickness of more than or equal to 400mm and the length-thickness ratio of less than or equal to 5, and the treatment process comprises the following steps:
(1) heating: controlling the temperature difference between the upper surface and the lower surface of the blank when the blank is discharged from the furnace to be +10 to +50 ℃;
(2) rolling: the linear velocity ratio of the upper and lower rolls is controlled to be +1.05 to +1.13 in the roll biting stage.
Further, the large-thickness small-size blank is selected from a continuous casting blank, a composite blank and a large steel ingot.
Further, in the step (1), the blank with large thickness and small size is charged in the furnace at the temperature of 500-700 ℃.
Further, in the step (1), after the large-thickness small-size blank is charged into the furnace, soaking and heat preservation are carried out at 1200-1300 ℃, the total in-furnace time of the large-thickness small-size blank is controlled according to 1.4-1.6 min/mm, full burn-through before the blank is rolled is ensured, and rolling of 'black core steel' is avoided.
Further, closing a lower burner nozzle of the heating furnace at the middle and later stages of soaking and heat preservation at 1200-1300 ℃, and simultaneously adjusting parameters of an upper burner nozzle to ensure that the temperature of the whole furnace is kept at a set soaking temperature.
Further, the total heat preservation time of soaking heat preservation at 1200-1300 ℃ is controlled according to 0.4-0.6 min/mm, and the heat preservation time after the lower burner nozzle is closed is controlled according to 0.15-0.20 min/mm.
Furthermore, before rolling in the step (2), firstly, high-pressure water descaling is carried out on the discharged blank.
Further, in the step (2), a low-speed high-pressure rolling process is adopted in the rough rolling stage, the maximum biting speed is controlled according to 1.0-1.5 m/s, and the rolling speed is controlled according to 1.5-3.0 m/s.
In a second aspect, the invention provides an application of the treatment process in the production of super-thick steel plates.
The invention has the beneficial effects that:
the processing technology of the large-thickness small-size blank can ensure that the large-thickness small-size blank always keeps a straight or slightly buckled and warped state in the rolling process, thereby ensuring the smooth operation of the rolling process; the treatment process can greatly reduce the rolling waste rate of the large-thickness blank, improve the production efficiency, further expand the material selection size range of the large-thickness blank, improve the rolling yield, provide great convenience for the design and organization of an order production plan, and have strong practicability.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, 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
A steel plate with the specification of 160mm multiplied by 2500mm multiplied by 6050mm is prepared by heating and rolling a vacuum composite continuous casting blank with the size of 570mm multiplied by 2000mm multiplied by 2650mm serving as a blank, and the specific treatment method comprises the following steps:
(1) heating: charging the blank at the furnace temperature of 600 ℃, heating in a sectional mode, and setting a heating curve as follows:
heating from 600 ℃ to 900 ℃ according to the coefficient of 0.3 min/mm;
keeping the temperature at 900 ℃ according to the coefficient of 0.2 min/mm;
heating from 900 ℃ to 1250 ℃ according to the coefficient of 0.5 min/mm;
keeping the temperature at 1250 ℃ according to the coefficient of 0.5min/mm, manually closing the lower exhaust nozzles of the heating furnace when the heat preservation time is remained for 110min, and simultaneously adjusting the gas quantity of the upper exhaust nozzles to ensure that the temperature of the soaking section is unchanged in a set range;
and discharging the blank after the operation of the heating curve is finished, wherein the total time of the blank in the furnace is 855min, and the temperature difference between the upper surface and the lower surface of the blank in the discharging process is +40 ℃ (the temperature of the upper surface is slightly higher than that of the lower surface).
(2) The blank discharged from the furnace is descaled by high pressure water and then rolled by adopting the conventional rough rolling and finish rolling staged low-speed high-pressure rolling process, and the difference is that the rolling parameters of a rough rolling machine are set as follows: the maximum biting speed was 1.2m/s, and the rolling speed was 2.5 m/s. During rolling, the linear velocity difference of the upper roller and the lower roller is dynamically controlled according to the process flatness condition of the intermediate billet, namely the linear velocity ratio of the upper roller and the lower roller is set according to +1.08 at the biting stage of the rollers. The blank is basically in a flat state in the whole rolling process, and the rolling is smoothly finished.
Example 2
A steel plate with the specification of 140mm x 2600mm x 8000mm is prepared by heating and rolling a blank which is a vacuum composite continuous casting blank with the size of 590mm x 2200mm x 2800mm, and the specific treatment method comprises the following steps:
(1) heating: charging the blank at the furnace temperature of 600 ℃, heating in a sectional mode, and setting a heating curve as follows:
heating from 600 ℃ to 900 ℃ according to the coefficient of 0.3 min/mm;
keeping the temperature at 900 ℃ according to the coefficient of 0.2 min/mm;
heating from 900 ℃ to 1250 ℃ according to the coefficient of 0.5 min/mm;
keeping the temperature at 1250 ℃ according to the coefficient of 0.5min/mm, manually closing the lower exhaust nozzles of the heating furnace when the heat preservation time is remained for 110min, and simultaneously adjusting the gas quantity of the upper exhaust nozzles to ensure that the temperature of the soaking section is unchanged in a set range;
and discharging the blank after the operation of the heating curve is finished, wherein the total time of the blank in the furnace is 885min, and the temperature difference between the upper surface and the lower surface of the blank is +30 ℃ when the blank is discharged (the temperature of the upper surface is slightly higher than that of the lower surface).
(2) The blank discharged from the furnace is descaled by high pressure water and then rolled by adopting the conventional rough rolling and finish rolling staged low-speed high-pressure rolling process, and the difference is that the rolling parameters of a rough rolling machine are set as follows: the maximum biting speed was 1.3m/s, and the rolling speed was 2.6 m/s. And during rolling, the linear velocity difference of the upper roller and the lower roller is dynamically controlled according to the process flatness condition of the intermediate billet, namely the linear velocity ratio of the upper roller to the lower roller is set to be +1.05 in the biting stage of the rollers. The blank is basically in a flat state in the whole rolling process, and the rolling is smoothly finished.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (9)
1. The treatment process of the large-thickness small-size blank is characterized in that the large-thickness small-size blank is a blank with the thickness of more than or equal to 400mm and the length-thickness ratio of less than or equal to 5, and comprises the following steps:
(1) heating: controlling the temperature difference between the upper surface and the lower surface of the blank when the blank is discharged from the furnace to be +10 to +50 ℃;
(2) rolling: the linear velocity ratio of the upper and lower rolls is controlled to be +1.05 to +1.13 in the roll biting stage.
2. The process according to claim 1, wherein said large-thickness small-size billet is selected from the group consisting of a continuous billet, a composite billet, and a large ingot.
3. The treatment process according to claim 1, wherein in the step (1), the large-thickness small-size blank is charged at a furnace temperature of 500-700 ℃.
4. The treatment process according to claim 3, wherein in the step (1), after the large-thickness small-size blank is charged into the furnace, the large-thickness small-size blank is soaked and kept at 1200-1300 ℃, and the total in-furnace time of the large-thickness small-size blank is controlled according to 1.4-1.6 min/mm.
5. The treatment process according to claim 4, wherein the lower burner of the heating furnace is closed at the middle and later stages of soaking and heat preservation at 1200-1300 ℃, and parameters of the upper burner are adjusted to ensure that the whole furnace temperature is kept at the set soaking temperature.
6. The treatment process according to claim 5, wherein the total heat-retaining time of soaking heat-retaining at 1200 to 1300 ℃ is controlled in the range of 0.4 to 0.6min/mm, and the heat-retaining time after the lower burner is closed is controlled in the range of 0.15 to 0.20 min/mm.
7. The process of claim 1, wherein the tapped billet is first subjected to high pressure water descaling prior to rolling in step (2).
8. The process according to claim 1, wherein in the step (2), the rough rolling stage adopts a low-speed high-pressure rolling process, the maximum biting speed is controlled according to 1.0-1.5 m/s, and the rolling speed is controlled according to 1.5-3.0 m/s.
9. Use of the treatment process according to any one of claims 1 to 8 in the production of extra thick steel plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111329451.6A CN114042752A (en) | 2021-11-10 | 2021-11-10 | Treatment process of large-thickness small-size blank and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111329451.6A CN114042752A (en) | 2021-11-10 | 2021-11-10 | Treatment process of large-thickness small-size blank and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114042752A true CN114042752A (en) | 2022-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111329451.6A Pending CN114042752A (en) | 2021-11-10 | 2021-11-10 | Treatment process of large-thickness small-size blank and application thereof |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517428A (en) * | 2011-12-23 | 2012-06-27 | 秦皇岛首秦金属材料有限公司 | Method for producing low compression ratio crack detection thick plate |
| CN102527735A (en) * | 2011-12-23 | 2012-07-04 | 秦皇岛首秦金属材料有限公司 | Method for controlling even deformation of edge portion in medium-thick board rolling |
| CN103008361A (en) * | 2012-12-25 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Method for controlling bending of steel plate head |
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-
2021
- 2021-11-10 CN CN202111329451.6A patent/CN114042752A/en active Pending
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| CN112246877A (en) * | 2020-09-25 | 2021-01-22 | 南京钢铁股份有限公司 | Production method for heating thin-specification blank by using trolley type heating furnace |
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Application publication date: 20220215 |
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