CN102699299B - Method for producing high-quality extra thick slab through complete gas atomization secondary cooling mode - Google Patents
Method for producing high-quality extra thick slab through complete gas atomization secondary cooling mode Download PDFInfo
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- CN102699299B CN102699299B CN201210219875.1A CN201210219875A CN102699299B CN 102699299 B CN102699299 B CN 102699299B CN 201210219875 A CN201210219875 A CN 201210219875A CN 102699299 B CN102699299 B CN 102699299B
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Abstract
The invention discloses a method for producing a high-quality extra thick slab through a complete gas atomization secondary cooling mode, and belongs to the technical field of secondary cooling in steel making and continuous casting. The method comprises the following steps of: performing statistics and analysis on occurrence regularity of transverse cracks on the surface of the extra thick slab, and according to the quality status of the casting slab, determining secondary cooling areas where the complete gas atomization cooling mode is implemented are 10-13 regions which are 18.9-45.04m apart from a meniscus region; reducing the amount of secondary cooling water in the 10-13 regions and controlling the water reducing amount within 20-80%; and increasing secondary cooling wind pressure of the 10-13 areas and controlling the wind pressure increasing amount within 20-60%. The method disclosed by the invention has the advantages that the occurrence regularity of the transverse cracks on the surface of the extra thick slab is effectively reduced, and the rate of the finished steel slab is improved.
Description
Technical field
The invention belongs to steel-making continuous casting Secondary Cooling field, a kind of complete aerosolization two method that cold mode is produced high-quality extra-thick plate blank is particularly provided, at the horizontal segment of casting machine, has adopted two cold modes of complete aerosolization to produce high-quality extra-thick plate blank (thickness specification >=400mm).
Background technology
The research of relevant cut deal base secondary cooling system, a lot of documents have carried out detailed elaboration, and research shows, and casting machine two cold-zones adopt weak cold mode, can effectively reduce the incidence of casting billet surface transverse crack.Qinhuangdao Shouqin Metal Material Co., Ltd. (hereinafter to be referred as Shou Qin company) 3# casting machine be can produce that thickness specification 400mm is above, straight arc, with the extra-thick slab casting machine of liquid core continuous bend-continuous straightening, because domestic and international iron and steel enterprise seldom applies the conticaster of the type, therefore the research of relevant extra-thick plate blank surface transverse cracks is considerably less, only has external part iron and steel enterprise to carry out simple introduction.In order to realize the suitability for industrialized production of high-quality extra-thick plate blank, be necessary the secondary cooling system of extra-thick plate blank to be optimized research, result of the test shows, horizontal segment at casting machine adopts two cold modes of complete aerosolization can reduce the incidence of extra-thick plate blank surface transverse cracks, and the method is conducive to improve the surface quality of extra-thick plate blank.
Summary of the invention
The method that the object of the present invention is to provide the cold mode of a kind of complete aerosolization two to produce high-quality extra-thick plate blank, horizontal segment at casting machine adopts two cold modes of complete aerosolization to produce high-quality extra-thick plate blank, thereby effectively reduce the incidence of extra-thick plate blank surface transverse cracks, improve the lumber recovery of steel billet.
The 3# of Shou Qin company casting machine horizontal section length reaches 21.07m, research shows, for extra-thick plate blank more than thickness specification 400mm, because pulling rate is lower, strand time of staying in horizontal segment is longer, and strand upper surface, to approach roller bearing place ponding serious, not only reduced the surface temperature of base shell, and make the base shell bear larger load (mechanical stress and thermal stress), increased the possibility that surface transverse cracks appears in extra-thick plate blank.
Facts have proved, for cut deal base, two cold-zones adopt weak cold mode, can effectively reduce the incidence of casting billet surface transverse crack; And for extra-thick plate blank, although the pattern by weak cold cast also can reduce the incidence of casting billet surface transverse crack, but effect is not very obvious, only at the horizontal segment of casting machine, adopt two cold modes of complete aerosolization, the incidence of extra-thick plate blank surface transverse cracks could be controlled in lower scope.The described cold mode of complete aerosolization two, refer to the horizontal segment for casting machine, reduce the water yield of each di-cold spray nozzle, two cold wind that simultaneously increase each nozzle are pressed, make secondary cooling water aerosolization completely before arriving casting billet surface of horizontal segment, be the surface that secondary cooling water does not reach strand, thereby avoided strand upper surface to produce the phenomenon of ponding.The method meets the cooling requirement of casting machine fan-shaped section body completely, thereby not affecting under the prerequisite of casting machine equipment, has greatly improved the surface quality of extra-thick plate blank.
Processing step of the present invention is as follows:
(1) pests occurrence rule of statistics, analysis extra-thick plate blank surface transverse cracks, according to the quality condition of strand, determines that two cold-zones of the complete aerosolization type of cooling of enforcement are 10-13 district, apart from meniscus 18.9-45.04m;
(2) reduce the secondary cooling water amount in 10-13 district, diminishing amount is controlled within the scope of 20-80%;
(3) two cold wind that increase 10-13 district are pressed, and recruitment is controlled within the scope of 20-60%.
The specific embodiment
Middle carbon niobium-containing steel for thickness specification 400mm, the clear inspection result of statistics, analysis steel billet, find, surface transverse cracks is concentrated the distance casting blank limit 250-600mm of the portion scope that occurs in, this position is the position of bearing between casting machine fan-shaped section three joint rollers just, and formation and the casting machine horizontal segment bearing place ponding of this explanation extra-thick plate blank surface transverse cracks are closely related.According to above analysis result, determined the specific implementation method of the complete aerosolization of casting machine fan-shaped section di-cold spray nozzle, step is as follows:
(1) according to the clear inspection result of extra-thick plate blank surface transverse cracks, the fan-shaped section of determining the complete aerosolization two cold modes of enforcement is that horizontal segment: Seg.9-Seg.17(Seg.9 is the abbreviation of Segment9, continuous casting technology term, what represent is No. 9 fan-shaped section), two corresponding cold-zones are 11-13 district, apart from meniscus 23.97-45.04m;
(2) the secondary cooling water amount in 11-13 district is reduced respectively to 70%, each district's secondary cooling water amount is all controlled at 10 l/min;
(3) two cold wind in 11-13 district are pressed and increased respectively 50%, each district's two cold wind are pressed and are all controlled at 1.5 bar.
Claims (1)
1. the method that the cold mode of complete aerosolization two is produced high-quality extra-thick plate blank, is characterized in that, processing step is as follows:
(1) statistics, analyze the pests occurrence rule of extra-thick plate blank surface transverse cracks, according to the quality condition of strand, determine that two cold-zones of implementing the complete aerosolization type of cooling are 11-13 district, apart from the casting machine horizontal segment of meniscus 23.97-45.04m;
(2) the secondary cooling water amount in 11-13 district is reduced respectively to 70%, each district's secondary cooling water amount is all controlled at 10 l/min;
(3) two cold wind in 11-13 district are pressed and increased respectively 50%, each district's two cold wind are pressed and are all controlled at 1.5 bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210219875.1A CN102699299B (en) | 2012-06-29 | 2012-06-29 | Method for producing high-quality extra thick slab through complete gas atomization secondary cooling mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210219875.1A CN102699299B (en) | 2012-06-29 | 2012-06-29 | Method for producing high-quality extra thick slab through complete gas atomization secondary cooling mode |
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| CN102699299A CN102699299A (en) | 2012-10-03 |
| CN102699299B true CN102699299B (en) | 2014-08-27 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108393456B (en) * | 2017-02-05 | 2019-10-29 | 鞍钢股份有限公司 | Q345B thick plate casting blank structure control method |
| CN111992686B (en) * | 2020-09-03 | 2021-12-17 | 福建三钢闽光股份有限公司 | Aerial fog full-water combined cooling high-carbon steel continuous casting production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010082637A (en) * | 2008-09-30 | 2010-04-15 | Jfe Steel Corp | Secondary cooling method in continuous casting |
| JP2010110813A (en) * | 2008-11-10 | 2010-05-20 | Nippon Steel Corp | Secondary cooling method and apparatus for continuously cast slab |
| CN102430733A (en) * | 2011-12-21 | 2012-05-02 | 天津钢铁集团有限公司 | Secondary cooling water amplitude-cutting control method of slab continuous casting machine |
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- 2012-06-29 CN CN201210219875.1A patent/CN102699299B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010082637A (en) * | 2008-09-30 | 2010-04-15 | Jfe Steel Corp | Secondary cooling method in continuous casting |
| JP2010110813A (en) * | 2008-11-10 | 2010-05-20 | Nippon Steel Corp | Secondary cooling method and apparatus for continuously cast slab |
| CN102430733A (en) * | 2011-12-21 | 2012-05-02 | 天津钢铁集团有限公司 | Secondary cooling water amplitude-cutting control method of slab continuous casting machine |
Non-Patent Citations (4)
| Title |
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| 400mm特厚板坯表面横裂纹控制技术;朱志远等;《钢铁》;20111231;第46卷(第12期);33-48 * |
| 刘如九.板坯连铸二次冷却过程动态交互式仿真***.《***仿真学报》.2011,第23卷(第9期),1819-1825. |
| 朱志远等.400mm特厚板坯表面横裂纹控制技术.《钢铁》.2011,第46卷(第12期),33-48. |
| 板坯连铸二次冷却过程动态交互式仿真***;刘如九;《***仿真学报》;20110930;第23卷(第9期);67-75 * |
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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. 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. |
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Effective date of registration: 20190412 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing 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. |
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