CN102284522B - Online accelerated cooling method with function of pre-straightening - Google Patents

Online accelerated cooling method with function of pre-straightening Download PDF

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Publication number
CN102284522B
CN102284522B CN201110253731.3A CN201110253731A CN102284522B CN 102284522 B CN102284522 B CN 102284522B CN 201110253731 A CN201110253731 A CN 201110253731A CN 102284522 B CN102284522 B CN 102284522B
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straightening
cooling
online
acceleration
steel
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CN102284522A (en
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刘涛
余伟
何春雨
张立杰
李彦彬
邓宏玉
韩爽
詹智敏
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Beijing University of Technology
University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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Abstract

The invention belongs to the technical field of pre-straightening and cooling in a steel rolling production, and provides an online accelerated cooling method with a function of pre-straightening. The method comprises the following steps of: delivering steel plates which are in a thickness range of 6 to 80 mm after carrying out a finish rolling to a pre-straightener to straighten through a conveying roller way; introducing the steel plates into an online accelerated cooling area and fast cooling a temperature from 700 to 950 DEG C to 450 to 700 DEG C, and introducing the steel plates to a heavy straightener to straighten after the temperature is uniform. The pre-straightener and an online accelerated cooling device are arranged continuously and tightly, so that the pre-straightening and the accelerated cooling are synchronous. In the accelerated cooling, the roller way is used for varying a deceleration and an acceleration, thereby solving the problem of the inhomogeneity caused by that a temperature difference between steel and plates is more than 40 DEG C. As the pre-straightening and the accelerated cooling are synchronous, a process flow is effectively reduced. Therefore, a glancing flatness of the steel plates after being pre-straightened is not more than 2 mm/1000 mm; and the temperature difference between the steel plates and the plates is not more than 8 DEG C after the roller way is used for varying the deceleration and the acceleration, and changing a starting mode.

Description

A kind of online acceleration cooling method with pre-straightening
Technical field
The invention belongs to Rolling production aligning and cooling technology, a kind of online accelerated cooling process method with pre-straightening is provided.
Background technology
Online acceleration cooling system opens by control rolled piece high temperature austenite tissue morphology and the phase transition process that cold temperature, roller repairing speed and final cooling temperature control steel, the organization type of final control steel, form and distribution, reach crystal grain thinning, improve the intensity of steel plate and the object of toughness.Due to the domestic steel for engineering machinery tough to height, shipbuilding high-performance, pipe line steel, high-quality and there is the steel plate demand of particular/special requirement increasing, iron and steel enterprise generally adopts the method for online accelerated cooling process to carry out exploitation and the production of kind after rolling.Along with the continuous lifting of production kind requirement of strength, the cooldown rate of online accelerating cooling requires also to improve constantly, and promoted the development of Ultra Fast Cooling thus, ultra dense degree cooling device is also widely used in online accelerated cooling device.
The application of Ultra Fast Cooling makes the exploitation of more high intensity levels kind become a reality, and cooldown rate is also improved greatly.Simultaneously, while cooling capacity can meet instructions for use, the residual stress of steel plate and the glacing flatness problem of steel plate but frustration Zhe Ge manufacturer always, major embodiment both ways, roll the temperature homogeneity of rear steel plate and original glacing flatness on the one hand, the temperature homogeneity of another aspect steel plate after adopting acceleration cooling system and cold rear glacing flatness.In order to solve the problem, the technology of pre-straightening is adopted to solve original glacing flatness problem before adopting online accelerated cooling device, meanwhile, then to ensure the cold rear glacing flatness of steel plate with the temperature homogeneity ensureing accelerating cooling and complete by optimizing online acceleration cooling system related control strategies.
Utility model patent " a kind of system of producing Wide and Thick Slab product " (application number/patent No.: pre-straightening machine is set before mentioning press quenching equipment 201020208109.1), it is characterized in that, the distance between described press quenching equipment and pre-straightening machine is the length of one piece of maximum rolled plate.
And most domestic iron and steel enterprise has dropped into online accelerated cooling device at present, and the technology arrangement distance from milling train to accelerated cooling device is determined when dropping into online accelerated cooling device.If the spacing of pre-straightening machine and online accelerated cooling device must meet the position of one block of maximum steel plate, so milling train cannot normally be produced, and therefore drop into online acceleration cooling system for those and cannot drop into pre-straightening technology by the production line that technology arrangement limits.
Summary of the invention
Object of the present invention provides a kind of online acceleration cooling method with pre-straightening, solves the spacing restricted problem by milling train and online accelerated cooling device; Reduce steel plate residual stress simultaneously, solve steel billet temperature homogeneity question, good glacing flatness after ensure that the online accelerated cooling process of steel plate.
Technical scheme of the present invention is: a kind of online acceleration cooling method with pre-straightening, is characterized in that: arranging a pre-straightening machine apart from online accelerated cooling device entrance distance for 3-6 rice, pre-straightening is synchronous with accelerating cooling, and production stage is as follows:
Step 1: the steel plate of the complete rear thickness range 6 ~ 80mm of finish rolling, is transported to pre-straightening machine by transmission roller channel and carries out pre-straightening;
Step 2: steel plate enters online accelerated cooling device and carries out accelerating cooling while carrying out pre-straightening, 700 ~ 950 DEG C of steel billet temperatures are sprayed upper and lower cooler by ultra dense degree and is quickly cooled to 450 ~ 700 DEG C, cooling velocity controls at 1-30 DEG C/s;
Step 3: cooled rear steel plate and entered cooled powerful straightener and align.
Described online accelerating cooling adopts roller-way to become acceleration-deceleration, and acceleration-deceleration scope is at ± 0.02 m/s 2in, solving steel with plate temperature difference is 8-40 DEG C of non-uniform temperature.
Described online accelerating cooling adopts cooler to become open mode, namely changes cooler unlatching group number, cooler unlatching group number change≤2 groups, solves steel with the plate temperature difference more than 40 DEG C of non-uniform temperature.
Usual cut deal enterprise produces maximum steel plate length about 36 meters, calculate with milling train and online accelerated cooling device entrance distance 48-70 rice, adopt pre-straightening machine and online accelerated cooling device continous way compact Layout form, the outlet of pre-straightening machine is 3-6 rice apart from online accelerated cooling device entrance distance, realize pre-straightening synchronous with accelerating cooling, can not limit by the existing technology arrangement of enterprise's production line, ensure that the distance between milling train and pre-straightening machine simultaneously, before existing online accelerated cooling device, all can arrange a set of pre-straightening machine.
As follows for pre-straightening technique major advantage of the present invention:
(1) with online accelerated cooling device continous way compact Layout, existing technology arrangement bottleneck is solved;
(2) pre-straightening realizes synchronous with online accelerated cooling device;
(3) efficiently solve the complete rear steel plate nose discount of rolling, stick up tail button tail problem;
(4) steel plate residual stress is reduced by pre-straightening technique, residual-stress value≤30MPa;
(5) improve the glacing flatness of steel plate by pre-straightening technique, glacing flatness≤2mm/1000mm;
(6) ensure that the original steel plate glacing flatness entering online accelerated cooling device, the Homogeneous cooling for steel plate provides good premise.
Based on preceding method, the present invention adopts roller-way to become acceleration-deceleration, and acceleration-deceleration scope is at ± 0.02 m/s 2in, solving steel with plate temperature difference is 8-40 DEG C of non-uniform temperature.Roller-way becomes acceleration-deceleration and controls: consider that steel plate head and tail temperature is on the low side, after removing steel plate head, each 300-500mm of afterbody along its length, steel plate is on average divided physical segment N(N>=2) section, before collection accelerating cooling, head and tail temperature difference in each physical segment, is total to N group △ T i(i≤N), often organizes △ T icorrespondence calculates acceleration-deceleration a in the i-th physical segment i, adopt after becoming acceleration-deceleration and effectively can solve the steel billet temperature homogeneity question that temperature difference is along its length no more than 40 DEG C.
Based on preceding method, the present invention adopts cooler to become open mode, namely changes cooler unlatching group number, cooler unlatching group number change≤2 groups, solves steel with the plate temperature difference more than 40 DEG C of non-uniform temperature.Cooler becomes open mode and controls: steel plate is evenly divided into front and back M1, M2 two sections along its length, gathers M1, M2 section effective temperature mean value T m1, T m2if, T m1with T m2difference is greater than single group cooler ability, then adopt and become open mode control, open mode is respectively KQMS m1with KQMS m2, usual KQMS m2with KQMS m1opening cooler package number difference is 1-2 group, adopts cooler to become open mode and effectively can solve the steel billet temperature homogeneity question of temperature difference more than 40 DEG C along its length.
Apparatus of the present invention are extensively suitable for cut deal Rolling production field, applied widely, can realize pre-straightening machine and online accelerating cooling continous way compact Layout, realize pre-straightening and online accelerating cooling synchronous process; Solve steel plate temperature homogeneity, low residual stress and steel-plate shape problem along its length simultaneously.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the online accelerated cooling process of band pre-straightening of the present invention.
The powerful straightener of 1-pre-straightening machine, the online accelerated cooling device of 2-, 3-.
Accompanying drawing 2 is the present invention's online accelerating cooling roller-way change acceleration-deceleration schematic diagram.
Head and tail temperature difference, 8-steel plate head in 4 steel plate tail, 5-a section in the middle part of roller-way acceleration-deceleration, 6-steel plate, in 7-△ T section.
Accompanying drawing 3 is the present invention's online accelerating cooling change open mode schematic diagram.
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 upper cooler of 12-, 13-KQMS m2cooler under the latter half of open mode of steel plate, 14-.
Detailed description of the invention
Embodiment one: to produce the X65 steel plate of 13mm thickness, steel plate length 32m, finishing mill outlet distance accelerating cooling entrance 52m, pre-straightening outlet distance accelerating cooling entrance 5m, the application technology of the online accelerated cooling process of the band pre-straightening adopting accompanying drawing 1 to arrange is that example is to further describe its process.Steel billet temperature after finish rolling is complete controls at 870 DEG C, by transmission roller channel, steel plate is sent into accompanying drawing 1 pre-straightening (1) district and carry out pre-straightening, after head pre-straightening completes, enter online accelerated cooling device (2) district of accompanying drawing 1 adopts the upper and lower cooler of ultra dense degree injection to carry out water-spraying control to steel plate, by thermometric steel plate maximum temperature difference 50 DEG C end to end, the online accelerating cooling of accompanying drawing 3 is adopted 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, and cooling velocity controls at 15 DEG C/s, carries out being quickly cooled to 620 DEG C, and concrete technology parameter is carried out by computer and accurately controlled.Steel plate after controlled cooling model directly enters the powerful straightener of accompanying drawing 1 (3) district through approach table and aligns.The complete rear glacing flatness≤2mm/1000mm of pre-straightening; Adopt and become open mode control, steel plate is maximum 8 DEG C of temperature difference along its length, and property indices all reaches technical requirement.
Embodiment two: to produce the SPV490 steel plate of 30mm thickness, steel plate length 22m, finishing mill outlet distance accelerating cooling entrance 52m, pre-straightening outlet distance accelerating cooling entrance 5m, the application technology of the online accelerated cooling process of the band pre-straightening adopting accompanying drawing 1 to arrange is that example is to further describe its process.Steel billet temperature after finish rolling is complete controls at 820 DEG C, by transmission roller channel, steel plate is sent into accompanying drawing 1 pre-straightening (1) district and carry out pre-straightening, after head pre-straightening completes, enter online accelerated cooling device (2) district of accompanying drawing 1 adopts the upper and lower cooler of ultra dense degree injection to carry out water-spraying control to steel plate, by thermometric steel plate maximum temperature difference 25 DEG C end to end, adopt the online accelerating cooling roller-way acceleration-deceleration strategy of accompanying drawing 2, steel plate is divided into two sections of N=2, wherein first half section steel plate a 1acceleration is 0.008m/s 2, wherein second half section steel plate a 1acceleration is 0.005m/s 2, cooling velocity controls at 20 DEG C/s, carries out being quickly cooled to 460 DEG C, and concrete technology parameter is carried out by computer and accurately controlled.Steel plate after controlled cooling model directly enters the powerful straightener of accompanying drawing 1 (3) district through approach table and aligns.The complete rear glacing flatness≤1mm/1000mm of pre-straightening; Adopt roller-way to become acceleration-deceleration, steel plate is maximum 5 DEG C of temperature difference along its length, and property indices all reaches technical requirement.

Claims (2)

1. the online acceleration cooling method with pre-straightening, arranging a pre-straightening machine apart from online accelerated cooling device entrance distance for 3-6 rice, pre-straightening is synchronous with accelerating cooling, and its key step is as follows:
Step 1: the steel plate of the complete rear thickness range 6 ~ 80mm of finish rolling, is transported to pre-straightening machine by transmission roller channel and carries out pre-straightening;
Step 2: steel plate enters online accelerated cooling device and carries out accelerating cooling while carrying out pre-straightening, 700 ~ 950 DEG C of steel billet temperatures are sprayed upper and lower cooler by ultra dense degree and is quickly cooled to 450 ~ 700 DEG C, cooling velocity controls at 1-30 DEG C/s;
Step 3: cooled rear steel plate and entered cooled powerful straightener and align;
It is characterized in that: the accelerating cooling in step 2 adopts roller-way to become acceleration-deceleration, and acceleration-deceleration scope is at ± 0.02 m/s 2in, and every section of roller-way acceleration-deceleration is different, solving steel with plate temperature difference is 8-40 DEG C of non-uniform temperature.
2. a kind of online acceleration cooling method with pre-straightening according to claim 1, it is characterized in that: accelerating cooling adopts cooler to become open mode, namely change cooler unlatching group number, cooler unlatching group number change≤2 groups, to solve steel with the plate temperature difference more than 40 DEG C of non-uniform temperature.
CN201110253731.3A 2011-08-30 2011-08-30 Online accelerated cooling method with function of pre-straightening Active CN102284522B (en)

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CN102974623B (en) * 2012-12-05 2014-10-08 南京钢铁股份有限公司 Pre-straightening method for realizing plate shape control on medium and thick plates
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
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 Method for improving on-line accelerated cooling uniformity of medium plate
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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