CN102266923A - Large-taper continuous casting crystallizer copper pipe based on blank shell drawing-normalizing theory - Google Patents
Large-taper continuous casting crystallizer copper pipe based on blank shell drawing-normalizing theory Download PDFInfo
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- CN102266923A CN102266923A CN2011102096397A CN201110209639A CN102266923A CN 102266923 A CN102266923 A CN 102266923A CN 2011102096397 A CN2011102096397 A CN 2011102096397A CN 201110209639 A CN201110209639 A CN 201110209639A CN 102266923 A CN102266923 A CN 102266923A
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Abstract
The invention discloses a large-taper continuous casting crystallizer copper pipe based on a blank shell drawing-normalizing theory and a mechanism for generating a primary blank shell and drawing-normalizing a solid blank shell. The large-taper continuous casting crystallizer copper pipe based on the blank shell drawing-normalizing theory is characterized that a larger continuous taper design is adopted on the upper part of the copper pipe; the conventional taper is about 1% while the newly designed taper is up to 1.5%-2%; in addition, the differential value of the obliquity of the copper pipe counts for greater than 65% of the whole differential value in the distance of 375 mm from the upper opening of the continuous casting crystallizer copper pipe to the lower side. According to the invention, an ideal of protecting a slag blank shell and metal solid blank shell generation mechanism, and removing the recesses on the surface of the metal blank shell is provided, a reasonable and effective tape curve is designed, and an actual effect of the protection slag layer between the solid blank shell and an inner cavity of the copper pipe is explained; when the casting blank is downward, the casting blank is drawn and normalized in the copper pipe and used for eliminating an air gap because the crystallizer is vibrated up and down in a reciprocating way; meanwhile, the protection slag layer in a fusing state is extruded into the air gap in the process of drawing so as to be helpful for eliminating the air gap.
Description
Technical field
The present invention relates to the steel casting field, specially refer to big tapering continuously casting crystallizer copper pipe and elaboration initial solidification shell generating mode and the regular theory of drawing based on the regular theory of base shell drawing.
Background technology
In the casting process, molten steel forms nascent solid-state base shell and along with strand descending obtains cooling and constantly increase its thickness in copper pipe in crystallizer, after strand leaves crystallizer, having certain thickness solid-state base shell is keeping the interior liquid molten steel to continue to go downwards to two cold houses, having the solid-state base shell of safe enough thickness zero defect is cooling forming core and the key point of solidifying in the crystallizer, is that continuous casting is carried out most important condition continuously.Molten steel obtains the cooled and solidified process and is called a cold process in crystallizer, crystallizer is of paramount importance parts in the whole continuous casting installation for casting.The crystallizer copper pipe design is most important, not only directly has influence on every technical-economic index of production, and the surface quality of continuous casting billet has been played conclusive effect.
Molten steel has formed nascent base shell at crystallizer upper meniscus place around the copper pipe wall, because molten steel proportion is compared less with high-temperature solid base shell, caused the contraction of initial solidification shell, and in peritectic reaction process subsequently, shrink once more, make the nascent solid-state base shell of part leave the copper pipe wall and produce the gap, be also referred to as air gap.The air gap thermal resistance is huge, one cold diabatic process can not normally be carried out, near the heat transfer that solid-state base shell does not obtain continuous and effective the air gap increases shell thickness, in the time of after strand leaves the copper pipe constraint, do not reach safe shell thickness, to cause two cold house's bleed-out technology accidents or casting billet surface to produce many disadvantages, have a strong impact on the ordinary production and the slab quality of continuous casting.
Continuous casting circle has adopted casting blank shell to shrink theory in the crystallizer copper pipe design at present, be that the density raising in constantly cooling off of solid-state base shell has caused volume contraction, produce to shrink on whole solid-state base shell, the up big and down small tapering curve of copper pipe inner chamber falls the solid-state base shell that causes and shrinks and design in order to remedy solid-state base shell temperature.But what this theory can not be interpreted as to use than the auger line of writing music and to keep the ordinary production of strand, can not explain why crystallizer has bigger resistance and casting billet surface often to occur depressed phenomenon why, the casting billet surface depression is comparatively serious in circle base production process especially.Existing one cold design philosophy theory can not instruct the design of contemporary crystallizer copper pipe, when the high-strength and high ductility steel grade constantly occurs, carbon content in the steel constantly reduces, alloy content rises, peritectic reaction is serious, cc billet surface quality is difficult to control, thus needing to demand urgently a new theory to explain a cold process, thus there is correct theory to instruct the inner chamber curve design of crystallizer copper pipe.
Summary of the invention
The purpose of this invention is to provide the unique big tapering continuously casting crystallizer copper tube cavity curve design of a kind of employing; and set forth the solid-state base shell of covering slag base shell and metal formation mechanism; by a large amount of practices and thinking; set up and in crystallizer copper pipe, formed initial solidification shell mechanism; and having set forth by drawing comes regular solid-state strand to eliminate the theory of air gap; design novel crystallizer copper pipe curve on this basis, thereby realized purpose of the present invention.
Technical problem solved by the invention can realize by the following technical solutions:
Big tapering continuously casting crystallizer copper pipe based on the regular theory of base shell drawing, it is characterized in that, adopt big taper design on the top of copper pipe, conventional tapering is about 1%, and newly-designed tapering reaches 1.5%-2%, and suitable for reading in following 375mm copper pipe length range from copper pipe, the difference that the copper pipe gradient has accounts for more than 65% of whole difference.When producing Φ 280mm circle base, copper pipe upper and lower opening difference in diameter is 4.2mm, and difference has just reached more than the 2.73mm in the scope of the 375mm on top so.
Set forth covering slag base shell and metal base shell formation mechanism, it is characterized in that described method comprises the steps:
1) under the crystallizer copper pipe cooling effect, the covering slag liquid slag layer at first was used for the protection slag blanket of steady heat transfer in copper pipe inner chamber formation one before the metal base shell generated, and liquid then molten steel forms initial solidification shell on this protection slag blanket;
2) constantly increase the base shell of thickness by in the whole descending process of copper pipe inner chamber, drawing effect in the formation of crystallizer up-down vibration, the air gap regular elimination of drawing gradually that the depression of solid-state base shell is produced, protection slag blanket with fusion is squeezed in the air gap simultaneously, cooperates drawing to reach the purpose of eliminating air gap;
3) pass through in the process of copper pipe bottom at the base shell, continuation causes the base shell closely to contact the condition of copper pipe inwall by the drawing effect, remain a stable cold diabatic process, make solid-state base shell constantly increase thickness, reach safe solid-state shell thickness after leaving crystallizer, thereby guarantee slab surface quality.
The invention has the advantages that: according to the formation rule of base shell and the behavior in the contraction process, adopt to be different from usual design, improved the amount of taper of copper pipe greatly, particularly at the basifacial tapering of copper pipe bent moon.In the formation of initial solidification shell, the inevitable local dent phenomenon that produces on solid-state base shell, must be by the drawing effect on short distance, the regular shaping of base shell of depression will be produced, make the base shell along being adjacent to copper pipe all around or on the circumference, keep solid-state base shell with normal regular rectangle or round shape, in the crystallizer up-down vibration, progressively eliminate the air gap that depression produces, thereby reach a cold heat transfer of uniformity.After the crystallizer outlet, reach safe shell thickness at least, be subjected to the baptism of two cold processes with flawless base shell joint.
Description of drawings
Fig. 1 is the schematic diagram of crystallizer copper pipe of the present invention.
Fig. 2 is a taper design curve map of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
As shown in Figure 1, big tapering continuously casting crystallizer copper pipe based on the regular theory of base shell drawing of the present invention, adopt big tapering in the meniscus bottom, conventional tapering is about 1%, and newly-designed tapering reaches 1.5%-2%, copper pipe is suitable for reading on following 375mm distance in design, the difference that the copper pipe gradient has accounts for more than 65% of whole difference, thereby realize that quick drawing is regular, air gap is eliminated, subsequently one obtain the good heat transfer cooling in cold, reach final one cold required base shell thickness be installed.
The ordinate of Fig. 2 is a copper pipe length, is exactly the end opening to copper pipe suitable for reading from copper pipe from the top down.Abscissa is the difference of copper pipe inner chamber, and difference maximum when copper pipe is suitable for reading ends up being zero to end opening.Curve in the figure just corresponding the difference on the copper pipe different length.Such as producing Φ 280mm circle base, copper pipe length is 800mm, total tapering reaches 1.815%, suitable for reading and diameter difference end opening of copper pipe is 4.2mm, place at distance copper pipe 375mm suitable for reading, used the difference more than 65%, purpose is to come the regular shaping of drawing with the gradient of maximum under meniscus, reaches the purpose of eliminating air gap as early as possible.Several curves among the figure are that the different taper value of design shows.
Outside a kind of continuous cast mold copper pipe that adopts taper design, also set forth covering slag base shell and metal base shell formation mechanism, comprised the steps:
1) before the metal base shell generated, the melt cinder pond moved up and down at crystallizer, and covering slag is spread upon on the crystallizer copper pipe, had produced one deck and had been used for steady heat transfer and lubricated protection slag blanket, and molten steel forms the nascent solid-state base shell of metal on this covering slag then;
2) pass through in the whole process of meniscus bottom copper pipe at the base shell, the drawing effect that the descending and crystallizer up-down vibration of strand forms can be squeezed into the protection slag blanket of molten condition in the air gap, cooperates the drawing effect to reach the purpose of eliminating air gap;
3) pass through in the process of copper pipe bottom at the base shell, continue to cause the base shell closely to contact the condition of copper pipe inwall, thereby remain a stable cold diabatic process by drawing.
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 illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; all in the claimed scope of the invention, the claimed scope of the present invention is defined by appending claims and equivalent thereof these changes and improvements.
Claims (2)
1. based on the big tapering continuously casting crystallizer copper pipe of the regular theory of base shell drawing, it is characterized in that, adopt big tapering design concept on the top of copper pipe, conventional tapering is about 1%, and newly-designed tapering reaches 1.5%-2%, and on the 375mm distance below suitable for reading the playing from copper pipe, copper pipe gradient difference accounts for more than 65% of whole difference.
2. based on base shell generation method in the big tapering continuously casting crystallizer copper pipe of the regular theory of base shell drawing, it is characterized in that described method comprises the steps:
1) under the crystallizer copper pipe cooling effect, the covering slag liquid slag layer at first was used for the protection slag blanket of steady heat transfer in copper pipe inner chamber formation one before the metal base shell generated, and liquid then molten steel forms initial solidification shell on this protection slag blanket;
2) constantly increase the base shell of thickness by in the whole descending process of copper pipe inner chamber, drawing effect in the formation of crystallizer up-down vibration, the air gap regular elimination of drawing gradually that the depression of solid-state base shell is produced, protection slag blanket with fusion is squeezed in the air gap simultaneously, cooperates drawing to reach the purpose of eliminating air gap;
3) pass through in the process of copper pipe bottom at the base shell, continuation causes the base shell closely to contact the condition of copper pipe inwall by the drawing effect, remain a stable cold diabatic process, make solid-state base shell constantly increase thickness, reach safe solid-state shell thickness after leaving crystallizer, thereby guarantee slab surface quality.
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| CN2011102096397A CN102266923A (en) | 2011-07-25 | 2011-07-25 | Large-taper continuous casting crystallizer copper pipe based on blank shell drawing-normalizing theory |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858378A (en) * | 2015-06-15 | 2015-08-26 | 大连华锐重工集团股份有限公司 | Straight port step curve crystallizer copper tube with milling grooves and crystallizer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2489897Y (en) * | 2001-09-01 | 2002-05-08 | 大连大山结晶器厂 | Crystallizer copper pipe |
| CN2693378Y (en) * | 2004-01-06 | 2005-04-20 | 朱萃汉 | Distributing device |
| CN1680055A (en) * | 2004-04-05 | 2005-10-12 | 张祝得 | Process and special crystallizer structure of continuous casting and drawing pigots |
| CN1872453A (en) * | 2005-06-02 | 2006-12-06 | 广州钢铁企业集团有限公司 | Horizontal conticaster and technique of billet withdrawal |
| CN200988090Y (en) * | 2006-12-22 | 2007-12-12 | 天津赛瑞机器设备有限公司 | Large cross section round blank crystallizer for continuous casting |
| CN101279360A (en) * | 2008-05-15 | 2008-10-08 | 天津钢管集团股份有限公司 | Method for producing low alloyed steel continuous casting circular tube blank with a diameter of 350-400mm |
| CN201543784U (en) * | 2009-10-23 | 2010-08-11 | 宝山钢铁股份有限公司 | Low-stress variation bipyramid round billet continuous casting crystallizer |
-
2011
- 2011-07-25 CN CN2011102096397A patent/CN102266923A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2489897Y (en) * | 2001-09-01 | 2002-05-08 | 大连大山结晶器厂 | Crystallizer copper pipe |
| CN2693378Y (en) * | 2004-01-06 | 2005-04-20 | 朱萃汉 | Distributing device |
| CN1680055A (en) * | 2004-04-05 | 2005-10-12 | 张祝得 | Process and special crystallizer structure of continuous casting and drawing pigots |
| CN1872453A (en) * | 2005-06-02 | 2006-12-06 | 广州钢铁企业集团有限公司 | Horizontal conticaster and technique of billet withdrawal |
| CN200988090Y (en) * | 2006-12-22 | 2007-12-12 | 天津赛瑞机器设备有限公司 | Large cross section round blank crystallizer for continuous casting |
| CN101279360A (en) * | 2008-05-15 | 2008-10-08 | 天津钢管集团股份有限公司 | Method for producing low alloyed steel continuous casting circular tube blank with a diameter of 350-400mm |
| CN201543784U (en) * | 2009-10-23 | 2010-08-11 | 宝山钢铁股份有限公司 | Low-stress variation bipyramid round billet continuous casting crystallizer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104858378A (en) * | 2015-06-15 | 2015-08-26 | 大连华锐重工集团股份有限公司 | Straight port step curve crystallizer copper tube with milling grooves and crystallizer |
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Application publication date: 20111207 |