CN102284522A - Online accelerated cooling method with function of pre-straightening - Google Patents
Online accelerated cooling method with function of pre-straightening Download PDFInfo
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- CN102284522A CN102284522A CN2011102537313A CN201110253731A CN102284522A CN 102284522 A CN102284522 A CN 102284522A CN 2011102537313 A CN2011102537313 A CN 2011102537313A CN 201110253731 A CN201110253731 A CN 201110253731A CN 102284522 A CN102284522 A CN 102284522A
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- 238000001816 cooling Methods 0.000 title claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 79
- 239000010959 steel Substances 0.000 claims abstract description 79
- 230000001133 acceleration Effects 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 description 15
- 238000003801 milling Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
本发明属于轧钢生产矫直及冷却技术领域，提供一种带预矫直的在线加速冷却方法：精轧完后厚度范围6～80mm的钢板，由传输辊道输送到预矫直机进行矫直，并进入在线加速冷却区域将温度700～950℃快速冷却至450～700℃，经均温后进入强力矫直机矫直。预矫直机与在线加速冷却装置采用连续紧凑布置形式，实现预矫直与加速冷却同步。加速冷却采用辊道变加减速度，解决来钢同板温度差为8-40℃温度不均匀性。加速冷却采用冷却器变开启模式，解决来钢同板温差超过40℃温度不均匀性。预矫直与加速冷却同步有效缩短了工艺流程，预矫直完后平直度≤2mm/1000mm，采用辊道变加减速度和变开启模式后钢板同板温差≤8℃。
The invention belongs to the technical field of straightening and cooling in rolling steel production, and provides an online accelerated cooling method with pre-straightening: steel plates with a thickness ranging from 6 to 80 mm after finish rolling are transported to a pre-leveler by a transmission roller table for straightening , and enter the online accelerated cooling area to quickly cool the temperature from 700 to 950°C to 450 to 700°C, and enter the powerful straightening machine for straightening after uniform temperature. The pre-straightening machine and the online accelerated cooling device adopt a continuous and compact arrangement to realize the synchronization of pre-straightening and accelerated cooling. Accelerated cooling adopts the variable acceleration and deceleration of the roller table to solve the temperature inhomogeneity of the temperature difference between the same plate of the incoming steel is 8-40 ℃. Accelerated cooling adopts cooler variable open mode to solve the temperature inhomogeneity of incoming steel with a temperature difference of more than 40°C. Synchronization of pre-straightening and accelerated cooling effectively shortens the process flow. After pre-straightening, the flatness is ≤2mm/1000mm, and the temperature difference between the steel plate and the same plate is ≤8℃ after adopting the variable acceleration and deceleration of the roller table and the variable opening mode.
Description
Technical field
The invention belongs to steel rolling and produce aligning and cooling technology, a kind of online accelerated cooling process method with pre-straightening is provided.
Background technology
Online acceleration cooling system is opened cold temperature, is rolled high temperature austenite tissue morphology and phase transition process that back cooldown rate and final cooling temperature are controlled steel by the control rolled piece, types of organization, form and the distribution of final control steel, reach crystal grain thinning, improve the intensity of steel plate and the purpose of toughness.Since domestic to the tough engineering machinery of height with steel, shipbuilding is with high-performance, pipe line steel, high-quality and have the steel plate demand of specific (special) requirements increasing, iron and steel enterprise generally carries out the exploitation and the production of kind rolling afterwards the method for the online accelerated cooling process of employing.Along with the continuous lifting of production kind requirement of strength, the cooldown rate of online acceleration cooling requires also to improve constantly, and has promoted the development of supper-fast cooling technology thus, and ultra dense degree cooling device also is widely used in the online accelerated cooling device.
The application of supper-fast cooling technology makes more that the exploitation of high intensity levels kind becomes a reality, and cooldown rate also is improved greatly.Simultaneously, when cooling capacity can satisfy instructions for use, the glacing flatness problem of the residual stress of steel plate and steel plate each manufacturer that but always frustrating, be mainly reflected in two aspects, one side is the temperature homogeneity and the original glacing flatness of having rolled the back steel plate, on the other hand the temperature homogeneity of steel plate and cold back glacing flatness after adopting acceleration cooling system.In order to address the above problem, adopt the technology of pre-straightening to solve original glacing flatness problem before adopting online accelerated cooling device, simultaneously, by optimizing the relevant control strategy of online acceleration cooling system to guarantee to quicken to cool off the cold back glacing flatness that the temperature homogeneity of finishing guarantees steel plate then.
Utility model patent " a kind of system of production Wide and Thick Slab product " (application number/patent No.: before mentioning press quenching equipment 201020208109.1) the pre-straightening machine is set, it is characterized in that the distance between described press quenching equipment and the pre-straightening machine is the length of a maximum rolled plate.
And present domestic most of iron and steel enterprise has dropped into online accelerated cooling device, and the distance of the technology arrangement from the milling train to the accelerated cooling device is determined when dropping into online accelerated cooling device.If distance must satisfy the position of a maximum steel plate between pre-straightening machine and the online accelerated cooling device, milling train can't ordinary production so, has therefore dropped into online acceleration cooling system for those and has been subjected to production lines of technology arrangement restriction can't drop into the pre-straightening technology.
Summary of the invention
Purpose of the present invention provides a kind of online acceleration cooling method with pre-straightening, solves the distance limit problem between milling train and the online accelerated cooling device that is subjected to; Reduce the steel plate residual stress simultaneously, solve the steel billet temperature homogeneity question, guaranteed behind the online accelerated cooling process of steel plate glacing flatness preferably.
Technical scheme of the present invention is: a kind of online acceleration cooling method with pre-straightening is characterized in that: for 3-6 rice a pre-straightening machine is being set in the distance that enters the mouth apart from online accelerated cooling device, pre-straightening is synchronous with the acceleration cooling, and production stage is as follows:
Step 1: the steel plate of the intact back of finish rolling thickness range 6～80mm is transported to the pre-straightening machine by transmission roller channel and carries out pre-straightening;
Step 2: steel plate enters online accelerated cooling device and quickens cooling when carrying out pre-straightening, 700～950 ℃ of steel billet temperatures are sprayed upper and lower cooler by ultra dense degree be quickly cooled to 450～700 ℃, and cooling velocity is controlled at 1-30 ℃/s;
Step 3: cooled off the back steel plate and entered cooled powerful straightener and align.
Described online acceleration cooling adopts roller-way to become acceleration-deceleration, and the acceleration-deceleration scope is at ± 0.02 m/s
2In, solving steel is 8-40 ℃ of temperature non with the plate temperature difference.
Described online acceleration cooling adopts cooler to become open mode, promptly changes cooler unlatching group number, and cooler unlatching group number changes≤2 groups, solves steel to surpass 40 ℃ of temperature nons with the plate temperature difference.
Usually cut deal enterprise produces about 36 meters of maximum steel plate lengths, calculate apart from 48-70 rice with milling train and online accelerated cooling device inlet, adopt pre-straightening machine and online accelerated cooling device continous way compact Layout form, the online accelerated cooling device inlet of pre-straightening machine outlet distance distance is a 3-6 rice, realize pre-straightening and quicken cooling synchronously, not limited by the existing technology arrangement of enterprise's production line, guarantee the distance between milling train and the pre-straightening machine simultaneously, before existing online accelerated cooling device, all can arrange a cover pre-straightening machine.
As follows at pre-straightening technology major advantage of the present invention:
(1) with online accelerated cooling device continous way compact Layout, solved existing technology arrangement bottleneck;
(2) pre-straightening and online accelerated cooling device are realized synchronously;
(3) efficiently solve rolling intact back steel plate nose discount, stick up tail button tail problem;
(4) reduce steel plate residual stress, residual-stress value≤30MPa by pre-straightening technology;
(5) improved the glacing flatness of steel plate by pre-straightening technology, glacing flatness≤2mm/1000mm;
(6) guaranteed to enter the original steel plate glacing flatness of online accelerated cooling device, prerequisite guarantees for the even cooling of steel plate provides preferably.
Based on preceding method, the present invention adopts roller-way to become acceleration-deceleration, and the acceleration-deceleration scope is at ± 0.02 m/s
2In, solving steel is 8-40 ℃ of temperature non with the plate temperature difference.Roller-way becomes acceleration-deceleration control: consider that the steel plate head and tail temperature is on the low side, steel plate is on average divided physical segment N(N 〉=2 after removing steel plate head, each 300-500mm of afterbody along its length) section, gather and quicken before the cooling head and tail temperature difference, N group △ T altogether in each physical segment
i(i≤N), every group of △ T
iCorrespondence calculates acceleration-deceleration a in the i physical segment
i, effectively solving along its length behind the employing change acceleration-deceleration, temperature difference is no more than 40 ℃ steel billet temperature homogeneity question.
Based on preceding method, the present invention adopts cooler to become open mode, promptly changes cooler unlatching group number, and cooler unlatching group number changes≤2 groups, solves steel to surpass 40 ℃ of temperature nons with the plate temperature difference.Cooler becomes open mode control: M1, M2 are two sections before and after along its length steel plate evenly being divided into, and gather M1, M2 section effective temperature mean value T
M1, T
M2If, T
M1With T
M2Difference then adopts to become open mode control greater than single group cooler ability, and open mode is respectively KQMS
M1With KQMS
M2, common KQMS
M2With KQMS
M1It is the 1-2 group that the unlatching cooler package is counted difference, adopts cooler to become open mode and can effectively solve the steel billet temperature homogeneity question of temperature difference above 40 ℃ along its length.
Apparatus of the present invention extensively are suitable for cut deal steel rolling production field, and are applied widely, can realize pre-straightening machine and online acceleration cooling continous way compact Layout, realize pre-straightening and online acceleration cooling synchronous process; Solve steel plate temperature homogeneity, low residual stress and steel-plate shape problem along its length simultaneously.
Description of drawings
Accompanying drawing 1 is the structural representation of the online accelerated cooling process of band pre-straightening of the present invention.
1-pre-straightening machine, the online accelerated cooling device of 2-, the powerful straightener of 3-.
Accompanying drawing 2 becomes the acceleration-deceleration schematic diagram for the online acceleration cooling roller bed of the present invention.
Roller-way acceleration-deceleration, 6-steel plate middle part, the interior head and tail temperature difference of 7-△ T section, 8-steel plate head in 4 steel plate afterbodys, the 5-a section.
Accompanying drawing 3 becomes the open mode schematic diagram for the online acceleration cooling of the present invention.
9-T
M2The latter half of temperature of steel plate, 10-T
M1Steel plate first half temperature, 11-KQMS
M1Steel plate first half open mode, the last cooler of 12-, 13-KQMS
M2Cooler under the latter half of open mode of steel plate, the 14-.
The specific embodiment
Embodiment one: the X65 steel plate with production 13mm thickness is an example, steel plate length 32m, finishing mill outlet distance is quickened cooling inlet 52m, pre-straightening exports distance and quickens cooling inlet 5m, and the application technology of the online accelerated cooling process of the band pre-straightening that employing accompanying drawing 1 is arranged is that example further describes its process.Steel billet temperature after finish rolling is intact is controlled at 870 ℃, by transmission roller channel steel plate is sent into accompanying drawing 1 pre-straightening (1) district and carry out pre-straightening, entering accompanying drawing 1 online accelerated cooling device (2) district after the head pre-straightening is finished adopts ultra dense degree to spray upper and lower cooler to the steel plate cooling of spraying water, by thermometric steel plate 50 ℃ of maximum temperature differences end to end, adopt accompanying drawing 3 online acceleration coolings to become open mode, KQMS
M1Steel plate first half open mode (11) is 2 groups and accompanying drawing 3 KQMS
M2The latter half of open mode of steel plate (13) is 3 groups and cools off that cooling velocity is controlled at 15 ℃/s, is quickly cooled to 620 ℃, and concrete technological parameter is carried out accurately control by computer.Steel plate after the control cooling directly enters accompanying drawing 1 powerful straightener (3) district through approach table and aligns.The intact back of pre-straightening glacing flatness≤2mm/1000mm; Adopt to become open mode control, steel plate is maximum 8 ℃ of temperature difference along its length, and every performance indications all reach specification requirement.
Embodiment two: the SPV490 steel plate with production 30mm thickness is an example, steel plate length 22m, finishing mill outlet distance is quickened cooling inlet 52m, pre-straightening exports distance and quickens cooling inlet 5m, and the application technology of the online accelerated cooling process of the band pre-straightening that employing accompanying drawing 1 is arranged is that example further describes its process.Steel billet temperature after finish rolling is intact is controlled at 820 ℃, by transmission roller channel steel plate is sent into accompanying drawing 1 pre-straightening (1) district and carry out pre-straightening, entering accompanying drawing 1 online accelerated cooling device (2) district after the head pre-straightening is finished adopts ultra dense degree to spray upper and lower cooler to the steel plate cooling of spraying water, by thermometric steel plate 25 ℃ of maximum temperature differences end to end, adopt accompanying drawing 2 online acceleration cooling roller bed acceleration-deceleration strategies, steel plate is divided into two sections N=2, wherein preceding half section steel plate a
1Acceleration is 0.008m/s
2, second half section steel plate a wherein
1Acceleration is 0.005m/s
2, cooling velocity is controlled at 20 ℃/s, is quickly cooled to 460 ℃, and concrete technological parameter is carried out accurately control by computer.Steel plate after the control cooling directly enters accompanying drawing 1 powerful straightener (3) district through approach table and aligns.The intact back of pre-straightening glacing flatness≤1mm/1000mm; Adopt roller-way to become acceleration-deceleration, steel plate is maximum 5 ℃ of temperature difference along its length, and every performance indications all reach specification requirement.
Claims (3)
1. online acceleration cooling method with pre-straightening is characterized in that: for 3-6 rice a pre-straightening machine is being set apart from online accelerated cooling device inlet distance, pre-straightening is with to quicken cooling synchronous, and production stage is as follows:
Step 1: the steel plate of the intact back of finish rolling thickness range 6～80mm is transported to the pre-straightening machine by transmission roller channel and carries out pre-straightening;
Step 2: steel plate enters online accelerated cooling device and quickens cooling when carrying out pre-straightening, 700～950 ℃ of steel billet temperatures are sprayed upper and lower cooler by ultra dense degree be quickly cooled to 450～700 ℃, and cooling velocity is controlled at 1-30 ℃/s;
Step 3: cooled off the back steel plate and entered cooled powerful straightener and align.
2. a kind of online acceleration cooling method with pre-straightening according to claim 1 is characterized in that: quicken cooling and adopt roller-way to become acceleration-deceleration, the acceleration-deceleration scope is at ± 0.02 m/s
2In, solving steel is 8-40 ℃ of temperature non with the plate temperature difference.
3. a kind of online acceleration cooling method according to claim 1 with pre-straightening, it is characterized in that: quicken cooling and adopt cooler to become open mode, promptly change cooler unlatching group number, cooler unlatching group number changes≤2 groups, solves steel to surpass 40 ℃ of temperature nons with the plate temperature difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110253731.3A CN102284522B (en) | 2011-08-30 | 2011-08-30 | Online accelerated cooling method with function of pre-straightening |
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| CN201110253731.3A CN102284522B (en) | 2011-08-30 | 2011-08-30 | Online accelerated cooling method with function of pre-straightening |
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| CN102284522B CN102284522B (en) | 2015-06-17 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974623A (en) * | 2012-12-05 | 2013-03-20 | 南京钢铁股份有限公司 | Pre-straightening method for realizing plate shape control on medium and thick plates |
| CN103555914A (en) * | 2013-11-25 | 2014-02-05 | 南京钢铁股份有限公司 | On-line quenching and plate shape controlling technology for 12MnNiVR steel plate |
| CN107175264A (en) * | 2017-06-21 | 2017-09-19 | 北京科技大学 | A kind of hot-rolled thick plank swings cooling means |
| CN111069308A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | A method for improving the uniformity of on-line accelerated cooling of medium and thick plates |
| CN114231823A (en) * | 2021-12-10 | 2022-03-25 | 福建三钢闽光股份有限公司 | Preparation method of low-residual-stress Q355B low-alloy steel plate |
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2011
- 2011-08-30 CN CN201110253731.3A patent/CN102284522B/en not_active Expired - Fee Related
Patent Citations (4)
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Non-Patent Citations (1)
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| 余伟等: "中厚板组织性能控制技术的发展和应用状况", 《钢铁研究学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974623A (en) * | 2012-12-05 | 2013-03-20 | 南京钢铁股份有限公司 | Pre-straightening method for realizing plate shape control on medium and thick plates |
| CN103555914A (en) * | 2013-11-25 | 2014-02-05 | 南京钢铁股份有限公司 | On-line quenching and plate shape controlling technology for 12MnNiVR steel plate |
| CN103555914B (en) * | 2013-11-25 | 2015-07-22 | 南京钢铁股份有限公司 | On-line quenching and plate shape controlling technology for 12MnNiVR steel plate |
| CN107175264A (en) * | 2017-06-21 | 2017-09-19 | 北京科技大学 | A kind of hot-rolled thick plank swings cooling means |
| CN107175264B (en) * | 2017-06-21 | 2019-04-12 | 北京科技大学 | A kind of hot-rolled thick plank swing cooling means |
| CN111069308A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | A method for improving the uniformity of on-line accelerated cooling of medium and thick plates |
| CN114231823A (en) * | 2021-12-10 | 2022-03-25 | 福建三钢闽光股份有限公司 | Preparation method of low-residual-stress Q355B low-alloy steel plate |
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| CN102284522B (en) | 2015-06-17 |
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