CN101954376A - Method for medium plate of controlled rolling at two stages in non-recrystallization region - Google Patents
Method for medium plate of controlled rolling at two stages in non-recrystallization region Download PDFInfo
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- CN101954376A CN101954376A CN 201010270319 CN201010270319A CN101954376A CN 101954376 A CN101954376 A CN 101954376A CN 201010270319 CN201010270319 CN 201010270319 CN 201010270319 A CN201010270319 A CN 201010270319A CN 101954376 A CN101954376 A CN 101954376A
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Abstract
The invention discloses a method for a medium plate of controlled rolling at two stages in a non-recrystallization region. The method is to perform two-stage rolling in a temperature range of the non-recrystallization region so as to improve the initial rolling temperature of rolling in the non-recrystallization region, and reduce the soaking time of an intermediate billet at high-temperature stage. The method comprises the following steps: the intermediate billet is immediately subject to first high pressure water descaling operation, when the intermediate billet is cooled to the temperature of the non-recrystallization temperature region, and then is subject to the first-stage rolling in the non-recrystallization region; the intermediate billet is subject to swing holding on the front or rear roller bed of a rolling mill; and the intermediate billet is subject to second high pressure water descaling operation after the billet is held to the set temperature, and then is subject to second-stage rolling in the non-recrystallization region to obtain the medium plate in accordance with the requirement. The method has few rolling passes and large total deformation of rolling in the non-recrystallization region, improves the output per hour, can stabilize the low-temperature impact performance of the steel plate, and improves the performance qualification rate.
Description
Technical field
The present invention relates to a kind of medium plate rolling method, the method for plate in the two stages controlled rolling of specifically a kind of non-recrystallization district.
Background technology
In the present Heavy Plate Plant of nationwide, for the high cut deal of performance requirement, adopt recrystallization zone and the two stages controlled rolling of non-recrystallization district, and the method for cooling control after rolling produces, its main process is as follows:
1, will heat whole austenitizings and finish the steel billet of alloy dissolving, and use high-pressure water descaling earlier, (more than 1050 ℃) by returning multiple distortion and crystallization again in the recrystallization zone, and the as-cast structure of steel billet is refined as recrystallized structure.Simultaneously steel billet thickness is compressed to 2-4 times of intermediate blank of finished product thickness.
2, intermediate blank treats that temperature (adopting air cooling, water-cooled or steam fog cooling) is to non-recrystallization temperature (below 950 ℃) cooling off on the roller-way.Corresponding start rolling temperature needs to retrodict according to the finishing temperature of each passage temperature drop of non-recrystallization district and technological requirement.
3, with the intermediate blank high-pressure water descaling.Carry out multi-pass continuous rolling in the non-recrystallization district, realize the flattening of crystal grain and gather a large amount of deformation energies.Intermediate blank thickness is compressed to the thickness of finished product steel plate requirement simultaneously, and finishing temperature reaches technological requirement.
4, laminar flow cooled off fast after the finished product steel plate sent milling train, to produce the tiny phase-change organization of crystal grain.
But this cut deal controlled rolling method commonly used, plate (mainly is the good low temperature impact properties of requirement in producing the 10-20mm high-performance, as pipe line steel, spherical tank steel, the high-strength plate of E level, maritime works's plate etc.) time, the desired finishing temperature of invar plate very low (760-830 ℃), the start rolling temperature of corresponding non-recrystallization district multi-pass continuous rolling is also very low, generally below 880-910 ℃.So low non-recrystallization district start rolling temperature brings following problem:
1, intermediate blank time of staying temperature on roller-way is long, and the corresponding time that contacts with oxygen in the air is long, and the secondary oxidation iron sheet of generation is thick, and it is big to remove the difficulty of secondary oxidation iron sheet with water under high pressure before the open rolling of non-recrystallization district, and respective metal consumes high.
2, because of non-recrystallization district start rolling temperature is low, the corresponding deformation drag is big, in limited mill capacity scope, and must control reduction in pass and increase rolling pass.Skill such as output, power consumption is through index when affecting machine.
Summary of the invention
In order to overcome the problem that prior art exists, the method that the purpose of this invention is to provide plate in the two stages controlled rolling of a kind of non-recrystallization district, this method is in non-recrystallization district temperature range, with rolling two stage rolling that are adjusted into of a stage in past, improve the rolling start rolling temperature in non-recrystallization district, reduce intermediate blank hot stage time of staying temperature, can reduce the generation of secondary oxidation iron sheet; Along with temperature improves, resistance of deformation reduces (in this warm area, raising temperature deformation drag reduces obviously), increases reduction in pass, the rolling total deformation of corresponding minimizing rolling pass and increase non-recrystallization district simultaneously; And when reducing rolling pass and can improve machine skills such as output, power consumption through index; Increase the total deformation in non-recrystallization district, but the steel sheet low temperature impact properties improves properties percent of pass.
The objective of the invention is to be achieved through the following technical solutions:
The method of plate in the two stages controlled rolling of a kind of non-recrystallization district, it is characterized in that this method is two stage rolling in non-recrystallization district temperature range, improve the rolling start rolling temperature in non-recrystallization district, reduce intermediate blank hot stage time of staying temperature, concrete steps are as follows:
1) in a single day intermediate blank treats that temperature is cooled to the non-recrystallization warm area, carries out the high-pressure water descaling operation first time immediately, and it is rolling to carry out the non-recrystallization district phase I; The phase I rolling pass can be the 2-4 passage, if there is high-pressure water descaling system can roll 3 passages behind the milling train machine, otherwise only can roll 2 or 4 passages, guarantees that intermediate blank can carry out the high-pressure water descaling operation second time when second stage is rolling.Phase I open rolling system temperature can be 950 ℃.
2) intermediate blank is swung on roller-way before or after the milling train and is treated temperature;
3) treat that temperature carries out second time high-pressure water descaling behind the design temperature and operate, and it is rolling to carry out non-recrystallization district second stage, is rolled down to technological requirement finishing temperature and finished product thickness, middle plate obtains meeting the requirements.Second stage open rolling system temperature can be 895 ℃.
The invention has the beneficial effects as follows; By the distortion in plate controlled rolling non-recrystallization district among the 12-20mm was adjusted to for two stages from a stage, reduced secondary oxidation iron sheet growing amount, skill such as output, power consumption is through index when having improved machine; And the total deformation in increase non-recrystallization district, make the finished product low temperature impact properties more stable, properties percent of pass improves.
The present invention is applicable in the 12-20mm medium plate rolling, will become the inexorable trend of plate controlled rolling non-recrystallization district's deformation temperature and deformation control among the 12-20mm.Compare with existing milling method, plate in one ton of 12-20mm high-performance of every production (mainly is the good low temperature impact properties of requirement, as pipe line steel, spherical tank with steel, the high-strength plate of E level, maritime works's plate etc.) this gain can be fallen more than 50 yuan, every Heavy Plate Production line is produced 20,000 tons of plate meters in this type of per year, can fall this more than 1,000,000.
The specific embodiment
Certain 2800 two-shipper stand four-high rolling mill medium plate mill adopts the present invention to carry out adjusting rolling to the X60 pipeline of 220mm base rolling 18.6 * 2000.
The method of plate in the two stages controlled rolling of a kind of non-recrystallization district, this method are two stage rolling in non-recrystallization district temperature range, improve the rolling start rolling temperature in non-recrystallization district, reduce intermediate blank hot stage time of staying temperature, and concrete steps are as follows:
In a single day intermediate blank treats that temperature is cooled to the non-recrystallization warm area, carries out the high-pressure water descaling operation first time immediately, and it is rolling to carry out the non-recrystallization district phase I; The phase I rolling pass can be the 2-4 passage, if there is high-pressure water descaling system can roll 3 passages behind the milling train machine, otherwise only can roll 2 or 4 passages, guarantees that intermediate blank can carry out the high-pressure water descaling operation second time when second stage is rolling.Concrete parameter sees Table 1.
Intermediate blank is swung on roller-way before or after the milling train and is treated temperature;
Treat that temperature carries out second time high-pressure water descaling behind technologist's design temperature and operate, and it is rolling to carry out non-recrystallization district second stage, is rolled down to technological requirement finishing temperature and finished product thickness, middle plate obtains meeting the requirements.Concrete parameter sees Table 1.
Existing method and two kinds of technology finishing mills of the present invention non-recrystallization district technological parameter are to such as table 1.
Table 1: two kinds of technology finishing mill non-recrystallization district technological parameter contrasts
Annotate: the present invention treated temperature about 30 seconds after the rolling end in second road, the intermediate blank temperature is controlled to 895 ℃, rolled three remaining passages after re-using once smart de-scaling.
As shown in Table 1: the front and back scheme mainly changes: 1, intermediate blank thickness increases 6mm.2, finishing mill non-recrystallization district start rolling temperature improves 40 ℃, and corresponding preceding twice drafts increases 3mm respectively.
Two kinds of scheme rolling front and back tissues and performance comparison:
1, former scheme final products grain size average out to 10.0-10.5 level adopts about 11 grades of patent scheme grain size average out to.
2, former scheme intermediate blank time of staying temperature is about 4.5 minutes, and patent scheme intermediate blank time of staying temperature is about 3 minutes.Corresponding per hour rolling piece number has been brought up to 36 from 30; The intermediate blank scale on surface is easy to remove, and plate face quality also has improvement.
3, former scheme low temperature (20 ℃) impacts and is 110-200J, and patent scheme-20 ℃ impact is 160-220J.More reliable and more stable.Corresponding properties percent of pass has been brought up to 97-98% from about 93%.
Cost and benefit to former scheme and the present invention program is analyzed, and output was fallen these about 40 yuan when the present invention program improved machine, reduces performance and changes the original sentence to about 45 yuan of gain.Along with X60 rolls into merit with the present invention program's examination, promote on the controlled rolling of plate has been produced in other 12-20mm.
The present invention adjusted to for two stages with the distortion in plate controlled rolling non-recrystallization district among the 12-20mm from a stage, had reduced secondary oxidation iron sheet growing amount, and skill such as output, power consumption is through index when having improved machine; Increase the total deformation in non-recrystallization district, make the finished product low temperature impact properties more stable, properties percent of pass improves.
Claims (3)
1. the method for plate in the non-recrystallization district two stages controlled rolling, it is characterized in that this method is two stage rolling in non-recrystallization district temperature range, improve the rolling start rolling temperature in non-recrystallization district, reduce intermediate blank hot stage time of staying temperature, concrete steps are as follows:
1) in a single day intermediate blank treats that temperature is cooled to the non-recrystallization warm area, carries out the high-pressure water descaling operation first time immediately, and it is rolling to carry out the non-recrystallization district phase I;
2) intermediate blank is swung on roller-way before or after the milling train and is treated temperature;
3) treat that temperature carries out second time high-pressure water descaling behind the design temperature and operate, and it is rolling to carry out non-recrystallization district second stage, is rolled down to technological requirement finishing temperature and finished product thickness, middle plate obtains meeting the requirements.
2. the method for plate in the two stages controlled rolling of non-recrystallization according to claim 1 district is characterized in that: open rolling system temperature is 950 ℃ the phase I in the step 1).
3. the method for plate in the two stages controlled rolling of non-recrystallization according to claim 1 district is characterized in that: second stage open rolling system temperature is 895 ℃ in the step 3).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102513370A (en) * | 2011-12-16 | 2012-06-27 | 南京钢铁股份有限公司 | Control process for single-stand Steckel mill to produce special-purpose pipeline steel |
| CN109295290A (en) * | 2018-09-25 | 2019-02-01 | 首钢集团有限公司 | A kind of production method of high-quality thick steel plates |
| CN111250545A (en) * | 2018-11-30 | 2020-06-09 | 上海梅山钢铁股份有限公司 | Control system and method for reducing swing steel coil over-thickness rate |
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| CN109295290A (en) * | 2018-09-25 | 2019-02-01 | 首钢集团有限公司 | A kind of production method of high-quality thick steel plates |
| CN111250545A (en) * | 2018-11-30 | 2020-06-09 | 上海梅山钢铁股份有限公司 | Control system and method for reducing swing steel coil over-thickness rate |
| CN111250545B (en) * | 2018-11-30 | 2022-05-10 | 上海梅山钢铁股份有限公司 | Control system and method for reducing swing steel coil over-thickness rate |
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Application publication date: 20110126 |