CN102601134B - Method for controlling thin pipeline steel cooling uniformity in ultrafast cooling process - Google Patents
Method for controlling thin pipeline steel cooling uniformity in ultrafast cooling process Download PDFInfo
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Abstract
一种超快冷工艺下薄规格管线钢冷却均匀性控制方法，属于钢板超快速冷却技术领域。利用超快冷的高强度均匀化冷却方式实现对管线钢的批量化生产，采用加速度和头尾遮蔽保证钢板长度方向温度均匀性，头尾遮蔽投入后，管线钢板长方向的头部与中部温差：20℃左右；过冷位置：距头尾＜200mm。保证了钢板纵向温度均匀性的控制，实现了钢板的同板温差小于30℃的目标，切尾量降低至200mm。采用软水封技术保证了钢板上表面积水的有序流动及控制，结合合理的冷却规程，使得钢板横向温度均匀，最终实现了单道次矫直批量化生产，减少了钢板矫直成本，提高了钢板整体性能。
The invention discloses a cooling uniformity control method for thin-gauge pipeline steel under an ultra-fast cooling process, which belongs to the technical field of ultra-fast cooling of steel plates. The mass production of pipeline steel is realized by using the high-strength uniform cooling method of ultra-fast cooling, and the acceleration and head-to-tail shielding are used to ensure the temperature uniformity in the length direction of the steel plate. : Around 20°C; supercooled position: <200mm from head to tail. It ensures the control of the uniformity of the longitudinal temperature of the steel plate, realizes the goal that the temperature difference between the same plate of the steel plate is less than 30°C, and reduces the trimming amount to 200mm. The soft water seal technology is used to ensure the orderly flow and control of water on the surface of the steel plate. Combined with reasonable cooling procedures, the lateral temperature of the steel plate is uniform, and finally realizes the mass production of single-pass straightening, which reduces the cost of steel plate straightening and improves the efficiency. The overall performance of the steel plate.
Description
Technical field
The invention belongs to the supper-fast cooling technology of steel plate field, thin specification pipe line steel cooling uniformity control method under a kind of ultrafast cold technology particularly is provided.
Background technology
Thin specification pipe line steel water-cooled mainly adopts the normal pressure laminar flow type of cooling, because the pipe line steel specification is thin, the cooling procedure temperature drop is big, make that the cold back whole cooling uniformity of steel plate is bad, residual stress after causing steel plate cold increases, make steel-plate shape be difficult for stable control, influence the production efficiency of steel plate, develop the cooling uniformity control method of thin specification pipe line steel under the ultrafast cold technology pattern of a cover for this reason.
Summary of the invention
The object of the present invention is to provide thin specification pipe line steel cooling uniformity control method under a kind of ultrafast cold technology, characteristics according to ultrafast cool equipment, ultrafast cold using method is analyzed and studied, solved in thin specification (12mm-30mm) the pipe line steel cooling procedure because cold back non-uniform temperature and caused the bad problem of plate shape.Reduced the on-line straightening passage, improved production efficiency, made that pipe line steel can the batch steady production.
Carry out on the ultrafast cool equipment that the present invention has possessed at the scene.Hot rolling Wide and Thick Slab production line has increased a ultrafast cool equipment before former laminar flow cooling device, ultrafast cool equipment is made up of the last lower collector pipe that 9 groups of quantity equate, last lower collector pipe is symmetrically distributed, the the 1st and the 3rd group is gap nozzle on the length direction, other 7 groups is three nozzles, and the intensity of cooling of gap nozzle is 1.5-2 times of three nozzles.0.8 meter of every group of collector always cools off 7.2 meters of length.Upper header is connected with hoisting mechanism, is used for lifting and adapts to different steel plate thickness.The last lower collector pipe of high pressure inclined jet becomes 30 degree with the angle of vertical direction, to the high pressure high density current of surface of steel plate spray to this.2 groups of side sprays are installed in ultrafast cold outlet simultaneously respectively, and spray in installing 3 groups inside on the ultrafast cold length direction, is used for removing the cooling water of steel plate upper surface remnants, guarantee that the upper surface cooling water is mobile in order.
Processing step of the present invention is as follows: 1. before rolling back steel plate water-cooled, ultrafast cold upper header is promoted to apart from lower collector pipe (300mm-350mm)+h (h is steel plate thickness).Owing to before the thin specification pipe line steel cooling, do not align, the whole unevenness of rolling the back steel plate requires control in 50mm/m-250mm/m.Because pipe line steel requires the cooling temperature drop at 200 degree-250 degree, needs to open 8 groups of ultrafast cold collectors, wherein, comprises 7 group of three nozzle and the 3rd group of gap nozzle.
2. according to the characteristics of ultrafast cold collector high pressure inclined jet, in conjunction with ultrafast cold in spray apparatus, supper-fast cooling section is divided into two zones, set collector along rolled piece configuration mode and collector parameter longitudinally.Can in time dispose the raising heat exchange efficiency in order to guarantee the remaining residual water of upper surface in the steel plate cooling procedure.With the 4th group in 9 groups of collectors, the injection direction of 8 groups and 9 groups collectors carries out contra-injection, accomplishes the subregion water-cooled, realize behind preceding 4 groups of the collector 5 groups packet layout, with the 4th group, 8 groups, the water yield increase of 9 groups of reverse collectors guarantees that the water that is ejected into the steel plate upper surface flows in order simultaneously.Spray in the 2nd group between the 4th group and the 5th group of collector is opened, and last 2 groups of sides spray is opened, and guarantees evenly cooling under high cooldown rate condition, for the cooling quality that improves steel plate, the phase transformation of control steel provide strong means.As shown in Figure 2
3. at the pipe line steel of different size, in order to remedy the temperature difference of steel plate entry, according to steel plate thickness and length the acceleration in the steel plate cooling procedure has been carried out following control, when steel plate head arrived first group of collector, roll table accelerating started, when the steel plate afterbody leaves last group collector, roll table accelerating stops, the acceleration of whole process is constant, is set between the 0.001-0.006, according to the specifications vary of steel plate and difference
4. the parameter that steel plate is covered end to end is divided into 5 layers according to the characteristics of steel plate, and wherein the layer of the 1st corresponding carbon content is not; The layer of the 2nd corresponding Mo content is not; The layer of the 3rd corresponding thickness is not; The layer of the 4th corresponding length is not; The layer of the 5th corresponding final cooling temperature is not.According to the PDI (initial data input) of steel plate, data can be called accordingly shield parameter end to end automatically.
Be the O point with the milling train center line, ultrafast cold first group of collector is 52.6 meters apart from the position of milling train, when steel plate head arrives between first group of ultrafast cold collector 2m-4m that opens of distance the position, roller table speed begins to accelerate, after the acceleration at the uniform velocity, when arriving the relevant position, the steel plate afterbody accelerates again, as shown in Figure 2
Length difference according to steel plate, corresponding shielding layer end to end is not different, it is the shield parameter difference end to end, steel plate forms relation one to one apart from position and the roller table speed offset of milling train center line, as shown in the table: parasang (m), speed unit (m/s), the roller table speed offset is controlled between 0.1m/s-0.5m/s.Complementary range control is between 2m-10m.Apart from milling train position of center line difference, increased roller table speed offset on former roller table speed basis according to steel plate head.
Good effect:
Utilize the ultrafast cold high strength homogenising type of cooling to realize mass production to pipe line steel, adopt acceleration and cover end to end and guarantee steel plate length direction temperature homogeneity, after covering input end to end, head and the middle portion temperature difference of pipeline steel plate length direction: about 20 ℃; Cross cold position: apart from end to end＜200mm.Guaranteed the inhomogeneity control of steel plate longitudinal temperature, the same plate temperature difference that has realized steel plate is less than 30 ℃ target, and the back-end crop amount is reduced to 200mm.Adopt the soft water encapsulation technique to guarantee flowing in order and control of steel plate upper surface ponding, in conjunction with reasonably cooling off rules, make that the steel plate transverse temperature is even, finally realized the mass production of single pass aligning, reduce steel plate aligning cost, improved the steel plate overall performance.
Description of drawings
Fig. 1 is subregion cooling schematic diagram.Wherein, plate represents the steel plate of water-cooled.
Steel plate upper surface 1 represents gap nozzle collector on first group, and lower surface 1 represents gap nozzle collector under first group;
Steel plate upper surface 2 represents three spray headers on first group, and lower surface 2 represents three spray headers under first group;
Steel plate upper surface 3 represents gap nozzle collector on first group, and lower surface 3 represents gap nozzle collector under first group;
Steel plate upper surface 4 represents three spray headers on first group, and lower surface 4 represents three spray headers under first group;
Steel plate upper surface 5 represents three spray headers on first group, and lower surface 5 represents three spray headers under first group;
Steel plate upper surface 6 represents three spray headers on first group, and lower surface 6 represents three spray headers under first group;
Steel plate upper surface 7 represents three spray headers on first group, and lower surface 7 represents three spray headers under first group;
Steel plate upper surface 8 represents three spray headers on first group, and lower surface 8 represents three spray headers under first group;
Steel plate upper surface 9 represents three spray headers on first group, and lower surface 9 represents three spray headers under first group;
Middle spray between the steel plate upper surface 2 and 3 is the 1st group;
Middle spray between the steel plate upper surface 4 and 5 is the 2nd group;
The 9 later middle sprays of steel plate upper surface are the 3rd group;
Fig. 2 is the position view of steel plate when shielding function uses end to end.
The specific embodiment
In order to improve thin specification pipe line steel cooling uniformity, we adopt the high-pressure injection formula type of cooling, ultrafast cold distance and the angle that goes up between the lower collector pipe adjusted, in the cooling procedure acceleration and end to end masking methods optimize, finally realized the control of pipe line steel cooling uniformity.
The ultrafast cold but rules of table 1:17.5mm pipe line steel
2. at the pipe line steel of different size, in order to remedy the temperature difference of steel plate entry, according to steel plate thickness and length the acceleration in the steel plate cooling procedure has been carried out following control, (the m/s of unit
2)
Table 2: thin specification pipe line steel acceleration
3, according to the length difference of steel plate, corresponding shielding layer end to end is not different, and it is the shield parameter difference end to end, and steel plate is as shown in the table apart from position and the roller table speed offset of milling train center line: parasang (m), speed unit (m/s)
Table 3: thin specification pipe line steel covers velocity compensated value end to end
Claims (2)
1. thin specification pipe line steel cooling uniformity control method under the ultrafast cold technology is implemented at ultrafast cool equipment, it is characterized in that processing step is as follows:
(1) roll back steel plate water-cooled before, ultrafast cold upper header is promoted to (300mm-350mm)+h, h is steel plate thickness; Make the whole unevenness control of rolling the back steel plate in 50mm/m-250mm/m; The cooling temperature drop needs to open 8 groups of ultrafast cold collectors at 200 degree-250 degree, wherein, comprises 7 group of three nozzle and the 3rd group of gap nozzle;
(2) supper-fast cooling section is divided into two zones, set collector along rolled piece configuration mode and collector parameter longitudinally; Can in time dispose the raising heat exchange efficiency in order to guarantee the remaining residual water of upper surface in the steel plate cooling procedure; With the 4th group in 9 groups of collectors, the injection direction of 8 groups and 9 groups collectors carries out contra-injection, accomplishes the subregion water-cooled, realize behind preceding 4 groups of the collector 5 groups packet layout, with the 4th group, 8 groups, the water yield increase of 9 groups of reverse collectors guarantees that the water that is ejected into the steel plate upper surface flows in order simultaneously; Spray in the 2nd group between the 4th group and the 5th group of collector is opened, and last 2 groups of sides spray is opened, and guarantees evenly cooling under high cooldown rate condition;
(3) when steel plate head arrives first group of collector, roll table accelerating starts, and when the steel plate afterbody left last group collector, roll table accelerating stopped, and the acceleration of whole process is constant, is set in 0.001-0.006m/s
2Between;
(4) parameter that steel plate is covered end to end is divided into 5 layers according to the characteristics of steel plate, and wherein the layer of the 1st corresponding carbon content is not; The layer of the 2nd corresponding Mo content is not; The layer of the 3rd corresponding thickness is not; The layer of the 4th corresponding length is not; The layer of the 5th corresponding final cooling temperature is not; Initial data input PDI data according to steel plate can be called accordingly shield parameter end to end automatically;
Be 0 point with the milling train center line, ultrafast cold first group of collector is 52.6 meters apart from the position of milling train, and when steel plate head arrived between first group of ultrafast cold collector 2m-4m that opens of distance the position, roller table speed began to accelerate, at the uniform velocity, when arriving the relevant position, the steel plate afterbody accelerates again after the acceleration;
Length difference according to steel plate, corresponding shielding layer end to end is not different, it is the shield parameter difference end to end, and steel plate forms relation one to one apart from position and the roller table speed offset of milling train center line, and the roller table speed offset is controlled between 0.1m/s-0.5m/s; Complementary range control is between 2m-10m; Apart from milling train position of center line difference, increased roller table speed offset on former roller table speed basis according to steel plate head.
2. method according to claim 1, it is characterized in that, described ultrafast cool equipment is made up of the last lower collector pipe that 9 groups of quantity equate, last lower collector pipe is symmetrically distributed, the 1st group and the 3rd group is gap nozzle on the length direction, other 7 groups is three nozzles, and the intensity of cooling of gap nozzle is 1.5-2 times of three nozzles; 0.8 meter of every group of collector always cools off 7.2 meters of length; Upper header is connected with hoisting mechanism, is used for lifting and adapts to different steel plate thickness; The last lower collector pipe of high pressure inclined jet becomes 30 degree with the angle of vertical direction, to surface of steel plate inject high pressure high density current; 2 groups of side sprays are installed in ultrafast cold outlet simultaneously respectively, and spray in installing 3 groups inside on the ultrafast cold length direction, is used for removing the cooling water of steel plate upper surface remnants, guarantee that the upper surface cooling water is mobile in order.
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| CN103736756B (en) * | 2013-12-18 | 2017-01-18 | 东北大学 | After-moderate-thickness-plate-rolling ultra-fast cooling device |
| CN103846289B (en) * | 2014-03-26 | 2016-03-30 | 东北大学 | A kind of edge part shading device of medium plate cooling after rolling system |
| CN105369021A (en) * | 2015-12-11 | 2016-03-02 | 武汉钢铁(集团)公司 | On-line quenching and cooling method taking account of shape and performance of thin-specification high-strength steel plate |
| CN106350645B (en) * | 2016-08-22 | 2018-06-19 | 南京钢铁股份有限公司 | A kind of press quenching of water power Wide and Thick Slab and Strip Shape Control technique |
| CN106222372B (en) * | 2016-08-30 | 2018-10-02 | 南京钢铁股份有限公司 | A kind of slab press quenching method based on inclination injection stream |
| CN109530461B (en) * | 2018-10-30 | 2020-09-11 | 中冶京诚工程技术有限公司 | Method and device for length control of non-cooling section of high-speed line passing through water cooling |
| CN110064667B (en) * | 2019-04-12 | 2021-03-23 | 首钢京唐钢铁联合有限责任公司 | Laminar cooling method for steel plate |
| CN114472548B (en) * | 2020-10-23 | 2024-06-04 | 宝山钢铁股份有限公司 | System and method for reducing head-tail temperature difference in ultra-long plate rolling process |
| CN114231718B (en) * | 2021-11-18 | 2024-03-19 | 首钢京唐钢铁联合有限责任公司 | Pipeline steel with narrow strength and same plate difference and production method thereof |
| CN114918248A (en) * | 2022-03-31 | 2022-08-19 | 日钢营口中板有限公司 | A low-carbon and acid-resistant pipeline steel thin and wide shape control method suitable for ultra-fast cooling |
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Address after: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee after: Shougang Group Co. Ltd. Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd. Co-patentee after: Northeastern University Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Capital Iron & Steel General Company Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. Co-patentee before: Northeastern University |
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Effective date of registration: 20190411 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Co-patentee after: Northeastern University Patentee after: Shougang Group Co. Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Shougang Group Co. Ltd. Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. Co-patentee before: Northeastern University |