CN102335733A - Method for soft reduction through bulging - Google Patents
Method for soft reduction through bulging Download PDFInfo
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- CN102335733A CN102335733A CN2011103226665A CN201110322666A CN102335733A CN 102335733 A CN102335733 A CN 102335733A CN 2011103226665 A CN2011103226665 A CN 2011103226665A CN 201110322666 A CN201110322666 A CN 201110322666A CN 102335733 A CN102335733 A CN 102335733A
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- bulge
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- casting blank
- bulging
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Abstract
The invention discloses a method for soft reduction through bulging, which is suitable for the end of a solidification stage of a casting blank. The method comprises the following steps of: controlling bulging which is generated on the surface of a shell of the casting blank and does not have any internal defect, and applying certain reduction to the bulging by using upper and lower rollers of a straightening machine to make molten steel in a thick area in the casting blank reasonably distributed in a certain space, so that segregation severity is reduced, intermediate porosity and shrinkage of the casting blank are reduced, and the internal quality of the casting blank is improved.
Description
Technical field
The present invention relates to iron and steel continuous casting field, specially refer to a kind of method of utilizing bulge gently to depress.
Background technology
Continuous casting is that liquid indefinite form molten steel casting is become the geometry solid metallic that needs.Square billet, rectangular bloom and slab account for absolute leading position on the continuous casting total amount.Because wide size of interior outer arc is big, the molten steel hydrostatic pressure in the two cold processes causes solid-state base shell outwards outstanding, forms what is called " bulge " defective on the strand physical dimension of knowing clearly in the big section casting blank production process.
Bulge is the product of molten steel static pressure in the casting process, and modern age, continuous casting academia and engineering circle all were to treat and handle as injurous defect with bulge all, strove eliminating bulge, and the main method that on technology and equipment, adopts has: reduce pulling rate; Adopt solid matter roller restriction bulge; A cold copper pipe length extends; Strengthen the cold intensity of cooling of a cold-peace two.
These methods all are for the thickness that increases casting blank shell improves opposing static pressure ability, and employing limits bulge and the bulge that produces is flattened in equipment design and manufacturing.Two cold house's conditions are very abominable, and the clamping of solid matter roller, cooling and Lubrication Design have caused complex equipmentsization, and maintenance workload is very big, and usually because solid matter roller stuck causes the slab quality problem.A lot of documents has all been set forth bulge and has been harmful to, and proposes the whole bag of tricks and eliminates it, and the mechanism and the impact analysis that in fact bulge are produced are not enough.
In a large amount of continuous casting process low powers and mill rolling practice, recognize that the suitable bulge that in two cold processes, produces is not influence the strand inherent quality, depressing of several passages just can be eliminated the physical dimension influence that bulge causes before the process in steel rolling process subsequently.Analysis shows if crystallizer one cold process is intact, in two cold processes, has produced slight bulge and can the inherent quality of strand not exerted an influence.
Gently depressing notion is to give certain drafts at the solidification end place of strand by the straightening machine, and the molten steel of denseization of dense and burned district, centre reasonably is distributed on certain space, reduces the order of severity of segregation, reduces the loose and shrinkage cavity in centre of strand.Modern age, the conticaster of high-tech equipment nearly all adopted these advanced means to improve the strand inherent quality.
Because to be positioned at the dense and burned district of strand, straightening machine place volume less, implement gently to depress the resistance of deformation that must overcome the solid-state base shell in both sides, and need bigger plane to depress to make its distortion be deep into strand inside.The essence of gently depressing is that the molten steel that is in dense and burned district in the middle of the strand is depressed distribution, and it then is forced producing therefrom the solid-state base shell in both sides is depressed distortion, and having caused needs the bigger pressure of depressing, and its effect is limited.
Summary of the invention
The purpose of this invention is to provide a kind of method of utilizing bulge gently to depress, utilize the bulge that produces on the outer arc direction in the strand gently to depress, thereby realize the object of the invention.
The technical problem that the present invention solved can adopt following technical scheme to realize:
A kind of method of utilizing bulge gently to depress is applicable to that the solidification stages of strand is terminal, it is characterized in that said method comprises the steps:
1) bulge of control casting blank shell surface generation;
2) control straightening machine gives certain drafts to said bulge, thereby the molten steel in the inner dense and burned district of strand reasonably is distributed on certain space.
In a preferred embodiment of the invention, said bulge is flawless middle high low arcuate structure strand all around.
Beneficial effect of the present invention is:
(1) reach continuous casting and gently depress ideal state, big distortion is deep into the requirement at strand SMIS position, reaches the best effect of gently depressing, and this is the inaccessiable degree of other any way;
(2) on existing straightening machine roller, depress, do not need the straightening machine is handled;
(3) reduce by two cold solid matter roller quantity, even can simplify strand two cool equipments greatly, reduced the descending resistance of strand, thereby improved the reliability of continuous casting installation for casting, reduce the maintenance workload of two cool equipments, improved the operating rate of casting machine without solid matter roller frame.
Description of drawings
Fig. 1 be of the present invention a kind of utilize method that bulge gently depresses gently depress preceding sketch map.
Fig. 2 be of the present invention a kind of utilize method that bulge gently depresses gently depress the back sketch map.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
As depicted in figs. 1 and 2; A kind of method of utilizing bulge gently to depress of the present invention; The solidification stages that is applicable to strand is terminal; Said method is at first chosen the comparatively complete bulge 110 in strand 100 surfaces, and 210 pairs of said bulges 110 of top roll of controlling the straightening machine then give certain drafts, thereby the molten steel in strand 110 inner dense and burned districts 120 reasonably is distributed on certain space.Said bulge 110 is flawless middle high low arcuate structure strand all around, thereby when eliminating bulge, reduces the order of severity of segregation, and loosening and shrinkage cavity in the centre that reduces strand, improves the inherent quality of strand.
Applicable object covering scope of the present invention: the 120mm square billet is to the 500mm square billet; Outer arc direction 100-450mm in the rectangular bloom, side arc leptoprosopy direction 100-620mm; Slab thickness is from 120-350mm, width 800mm-3000mm.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention, and under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications; All in the scope of the invention that requires to protect, the present invention requires protection domain to be defined by appending claims and equivalent thereof for these variations and improvement.
Claims (2)
1. a method of utilizing bulge gently to depress is applicable to that the solidification stages of strand is terminal, it is characterized in that said method comprises the steps:
1) control casting blank shell surface produces suitable bulge;
2) control straightening machine gives certain drafts to said bulge, thereby the molten steel in the inner dense and burned district of strand reasonably is distributed on certain space.
2. a kind of method of utilizing bulge gently to depress according to claim 1 is characterized in that, said casting blank bulging is low arcuate structure around high in the middle of the no open defect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103226665A CN102335733A (en) | 2011-10-21 | 2011-10-21 | Method for soft reduction through bulging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103226665A CN102335733A (en) | 2011-10-21 | 2011-10-21 | Method for soft reduction through bulging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102335733A true CN102335733A (en) | 2012-02-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103226665A Pending CN102335733A (en) | 2011-10-21 | 2011-10-21 | Method for soft reduction through bulging |
Country Status (1)
| Country | Link |
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| CN (1) | CN102335733A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109365525A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of method of cold rolled silicon steel slab quality control |
| CN110541056A (en) * | 2018-05-28 | 2019-12-06 | 上海梅山钢铁股份有限公司 | Process for reducing center segregation of casting blank |
| CN111801181A (en) * | 2018-03-02 | 2020-10-20 | 杰富意钢铁株式会社 | Method for continuously casting steel |
Citations (6)
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|---|---|---|---|---|
| JPS61189850A (en) * | 1985-02-20 | 1986-08-23 | Nippon Steel Corp | Continuous casting method of steel slab |
| CN1449877A (en) * | 2002-04-08 | 2003-10-22 | 住友金属工业株式会社 | Continuous casting method, continuous casting device and continuous casting blanket |
| KR20040056084A (en) * | 2002-12-23 | 2004-06-30 | 주식회사 포스코 | Continuous casting method for degreasing core segregation of a billet |
| JP2008149379A (en) * | 2008-03-12 | 2008-07-03 | Nippon Steel Corp | Cast slab with excellent solidification structure |
| CN101648264A (en) * | 2009-09-15 | 2010-02-17 | 邢台钢铁有限责任公司 | Method for distributing and controlling tension leveler torque in bloom continuous casting dynamic soft reduction process |
| CN101658911A (en) * | 2009-09-14 | 2010-03-03 | 东北大学 | Continuous-casting dynamic soft-reduction pressing quantity on-line control method of large square blank |
-
2011
- 2011-10-21 CN CN2011103226665A patent/CN102335733A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61189850A (en) * | 1985-02-20 | 1986-08-23 | Nippon Steel Corp | Continuous casting method of steel slab |
| CN1449877A (en) * | 2002-04-08 | 2003-10-22 | 住友金属工业株式会社 | Continuous casting method, continuous casting device and continuous casting blanket |
| KR20040056084A (en) * | 2002-12-23 | 2004-06-30 | 주식회사 포스코 | Continuous casting method for degreasing core segregation of a billet |
| JP2008149379A (en) * | 2008-03-12 | 2008-07-03 | Nippon Steel Corp | Cast slab with excellent solidification structure |
| CN101658911A (en) * | 2009-09-14 | 2010-03-03 | 东北大学 | Continuous-casting dynamic soft-reduction pressing quantity on-line control method of large square blank |
| CN101648264A (en) * | 2009-09-15 | 2010-02-17 | 邢台钢铁有限责任公司 | Method for distributing and controlling tension leveler torque in bloom continuous casting dynamic soft reduction process |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111801181A (en) * | 2018-03-02 | 2020-10-20 | 杰富意钢铁株式会社 | Method for continuously casting steel |
| US11077492B2 (en) | 2018-03-02 | 2021-08-03 | Jfe Steel Corporation | Continuous steel casting method |
| CN110541056A (en) * | 2018-05-28 | 2019-12-06 | 上海梅山钢铁股份有限公司 | Process for reducing center segregation of casting blank |
| CN110541056B (en) * | 2018-05-28 | 2021-07-09 | 上海梅山钢铁股份有限公司 | Process for reducing center segregation of casting blank |
| CN109365525A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of method of cold rolled silicon steel slab quality control |
| CN109365525B (en) * | 2018-10-09 | 2020-06-23 | 鞍钢股份有限公司 | Method for controlling quality of cold-rolled silicon steel casting blank |
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Application publication date: 20120201 |