CN102717047A - Method for producing high-quality extra-thick plate blank by adopting semidry process steel pouring mode - Google Patents
Method for producing high-quality extra-thick plate blank by adopting semidry process steel pouring mode Download PDFInfo
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- CN102717047A CN102717047A CN2012102240547A CN201210224054A CN102717047A CN 102717047 A CN102717047 A CN 102717047A CN 2012102240547 A CN2012102240547 A CN 2012102240547A CN 201210224054 A CN201210224054 A CN 201210224054A CN 102717047 A CN102717047 A CN 102717047A
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Abstract
The invention discloses a method for producing a high-quality extra-thick plate blank by adopting a semidry-process steel pouring mode, belong to the technical field of steelmaking continuous casting secondary cooling system. The method comprises the following processing steps of: carrying out statistics and analysis on occurrence rules of transverse cracks on the surface of an extra-thick plate blank, and determining secondary cooling regions to be 6-13 regions for implementing the semidry-process steel pouring mode according to quality conditions of a cast blank, wherein the 6-13 regions are 5-45m away from a meniscus; closing secondary cooling water at the edges of the 6-13 regions, reducing volume of the secondary cooling water at the center of the 6-13 regions, wherein water reduction is controlled to be 30-70%; adjusting parameters of secondary cooling air of the 6-13 regions, wherein for the secondary cooling regions with water closed, the secondary cooling air is controlled to be 0.5-1.5bar, and for the secondary cooling regions with water reduced, the secondary cooling air is controlled to be 1.5-2.5bar. The method disclosed by the invention has the advantages that occurrence rate of the transverse cracks on the surface of the extra-thick plate blank is effectively controlled, and yield of steel billets is improved.
Description
Technical field
The invention belongs to steel-making continuous casting secondary cooling system technical field, particularly provide a kind of employing semidry method to water the method that the punching block formula is produced high-quality extra-thick plate blank (more than the 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 cold mode a little less than adopt casting machine two cold-zones can effectively be controlled the incidence of casting billet surface transverse crack.But; Because domestic and international iron and steel enterprise's conticaster of above, the straight arc of applied thickness specification 400mm, band liquid chip bending-aligning seldom; Therefore the research of relevant extra-thick plate blank secondary cooling system is considerably less, has only external part iron and steel enterprise to carry out simple the introduction.Along with the increase of slab thickness, bending, straightening force that the base shell bears are bigger, occur surface transverse cracks more easily, have had a strong impact on the lumber recovery of steel billet.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 is optimized research; Result of the test shows; Adopt semidry method to water the incidence that steel can effectively be controlled the extra-thick plate blank surface transverse cracks, the precedent that present the method was not implemented at home and abroad.
Summary of the invention
The object of the present invention is to provide a kind of semidry method that adopts to water the method that the punching block formula is produced high-quality extra-thick plate blank, effectively control the incidence of extra-thick plate blank surface transverse cracks, improve the lumber recovery of steel billet.
Research shows; For the extra-thick plate blank more than the thickness specification 400mm, because pulling rate is lower, base shell time of staying in crystallizer is longer; Reduced the surface temperature of base shell; If aligning section base shell temperature is reduced to the brittleness temperature district of steel, under the effect of straightening force, be easy to form surface transverse cracks.
Facts have proved that for the cut deal base, cold mode a little less than adopt two cold-zones can effectively reduce the incidence of casting billet surface transverse crack; And for extra-thick plate blank; Though the pattern of cold cast also can reduce the incidence of casting billet surface transverse crack a little less than passing through; But effect is not very obvious, has only the semidry method of employing to water the punching block formula, could the incidence of extra-thick plate blank surface transverse cracks be controlled in the lower scope.Described semidry method is watered steel, refers to specific two cold-zones to casting machine, and the closed portion secondary cooling water reduces part secondary cooling water amount simultaneously, and the casting machine fan-shaped section satisfies under the prerequisite of cooling requirement in the steel pouring process, and the secondary cooling water amount of cooling off strand is controlled in the minimum zone.
Processing step of the present invention is following:
(1) pests occurrence rule of statistics, analysis extra-thick plate blank surface transverse cracks according to the quality condition of strand, confirms that it is the 6-13 district that the enforcement semidry method is watered two cold-zones of punching block formula, apart from meniscus 5-45m;
(2) close 6-13 district limit portion secondary cooling water, reduce 6-13 district center secondary cooling water amount simultaneously, the diminishing amount is controlled at 30-70%;
(3) adjustment 6-13 district two cold wind parameters, for two cold-zones of closing water, two cold wind are controlled in the 0.5-1.5 bar scope; For two cold-zones of diminishing, two cold wind are controlled in the 1.5-2.5bar scope.
The specific embodiment
Extra-thick plate blank to thickness specification 400mm; The clear inspection result of statistics, analysis steel billet finds that surface transverse cracks is concentrated and occurred in apart from the strand limit 200-500mm of portion scope; This explanation, the formation of extra-thick plate blank surface transverse cracks and the nozzle cooling of casting machine two cold-zone limit portion are closely related.According to above analysis result, confirmed that semidry method waters the practical implementation pattern of steel, step is following:
(1), confirms that it is the 8-13 district that the enforcement semidry method is watered two cold-zones of punching block formula according to the clear inspection result of extra-thick plate blank surface transverse cracks;
(2) close inside and outside arc limit, 8-10 district portion secondary cooling water; Inside and outside arc center, the 10 districts water yield is respectively reduced 70%, and the 11-13 district inner arc water yield reduces 67%;
(3) inside and outside arc limit, 8-10 district portion two cold wind are controlled at 1.0bar; Inside and outside arc center, 8-10 district two cold wind are controlled at 1.5bar, and 11-13 district inner arc two cold wind are controlled at 1.5bar.
Claims (1)
1. one kind is adopted semidry method to water the method that the punching block formula is produced high-quality extra-thick plate blank, it is characterized in that processing step is following:
(1) pests occurrence rule of statistics, analysis extra-thick plate blank surface transverse cracks according to the quality condition of strand, confirms that it is the 6-13 district that the enforcement semidry method is watered two cold-zones of punching block formula, apart from meniscus 5-45m;
(2) close 6-13 district limit portion secondary cooling water, reduce 6-13 district center secondary cooling water amount simultaneously, the diminishing amount is controlled at 30-70%;
(3) adjustment 6-13 district two cold wind parameters, for two cold-zones of closing water, two cold wind are controlled in the 0.5-1.5 bar scope; For two cold-zones of diminishing, two cold wind are controlled in the 1.5-2.5bar scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012102240547A CN102717047A (en) | 2012-06-29 | 2012-06-29 | Method for producing high-quality extra-thick plate blank by adopting semidry process steel pouring mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102240547A CN102717047A (en) | 2012-06-29 | 2012-06-29 | Method for producing high-quality extra-thick plate blank by adopting semidry process steel pouring mode |
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| CN102717047A true CN102717047A (en) | 2012-10-10 |
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| CN2012102240547A Pending CN102717047A (en) | 2012-06-29 | 2012-06-29 | Method for producing high-quality extra-thick plate blank by adopting semidry process steel pouring mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108907131A (en) * | 2018-07-10 | 2018-11-30 | 邯郸钢铁集团有限责任公司 | A kind of secondary cooling scheme method reducing sheet billet continuous casting base face crack end to end |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411059A (en) * | 1987-07-03 | 1989-01-13 | Kawasaki Steel Co | Method for controlling mold cooling water and secondary cooling water in round cast billet continuous casting |
| JPH1011059A (en) * | 1996-06-27 | 1998-01-16 | Matsuya Sogo Kenkyusho:Kk | Electronic piano |
| CN102489680A (en) * | 2011-12-28 | 2012-06-13 | 东北大学 | System and method for intelligently controlling temperature of internal arc angle part in straightening region of wide and thick plate blank |
-
2012
- 2012-06-29 CN CN2012102240547A patent/CN102717047A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6411059A (en) * | 1987-07-03 | 1989-01-13 | Kawasaki Steel Co | Method for controlling mold cooling water and secondary cooling water in round cast billet continuous casting |
| JPH1011059A (en) * | 1996-06-27 | 1998-01-16 | Matsuya Sogo Kenkyusho:Kk | Electronic piano |
| CN102489680A (en) * | 2011-12-28 | 2012-06-13 | 东北大学 | System and method for intelligently controlling temperature of internal arc angle part in straightening region of wide and thick plate blank |
Non-Patent Citations (3)
| Title |
|---|
| 朱志远等: "400mm特厚板坯表面横裂纹控制技术", 《钢铁》 * |
| 王悦新等: "中厚板含铌钢铸坯横裂纹分析及控制措施", 《第七届（2009）中国钢铁年会论文集》 * |
| 许晓东等: "连铸新技术在首钢400mm 特厚板坯生产中的应用", 《2011年第九届全国连铸学术会议》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108907131A (en) * | 2018-07-10 | 2018-11-30 | 邯郸钢铁集团有限责任公司 | A kind of secondary cooling scheme method reducing sheet billet continuous casting base face crack end to end |
| CN108907131B (en) * | 2018-07-10 | 2020-07-03 | 邯郸钢铁集团有限责任公司 | Secondary cooling control method for reducing surface cracks of head and tail blanks of slab continuous casting |
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Application publication date: 20121010 |