CN203356554U - Crystallizer for restraining longitudinal cracks in continuous casting slab - Google Patents

Crystallizer for restraining longitudinal cracks in continuous casting slab Download PDF

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CN203356554U
CN203356554U CN 201320338858 CN201320338858U CN203356554U CN 203356554 U CN203356554 U CN 203356554U CN 201320338858 CN201320338858 CN 201320338858 CN 201320338858 U CN201320338858 U CN 201320338858U CN 203356554 U CN203356554 U CN 203356554U
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crystallizer
copper coin
curved regions
slab
curve
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张慧
陶红标
吴夜明
王玫
王明林
王一成
赵沛
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Of Continuous Casting Technology In National Engineering Research Center Co Ltd
Central Iron and Steel Research Institute
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Of Continuous Casting Technology In National Engineering Research Center Co Ltd
Central Iron and Steel Research Institute
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Abstract

The utility model relates to the field of metal continuous casting, in particular to a crystallizer for restraining longitudinal cracks in a continuous casting slab. The crystallizer is suitable for slabs with the thickness of 100-450mm. The crystallizer comprises a pair of wide-face copper plates and a pair of narrow-face copper plates. For each wide-face copper plate, the upper portion of a working face is composed of a curved-surface area (1) located in the middle of the copper plate and plane areas (2) located on the two sides of the copper plate, the lower portion of the working face is composed of a plane area (3), and the portion, with the distance of 60-120mm to the upper edge of the wide-face copper plate, of the curved-surface area (1) is a crescent-face area; according to the curved-surface area (1) with the taper of the crescent-face area improved of the wide-face copper plate, the recession depth D2 of the curved-surface area (1) is continuously reduced in the slab drawing direction, and therefore the thickness of the slab on the upper portion of the crystallizer is gradually reduced from top to bottom. The crystallizer is beneficial to reducing air gaps between an initially-solidified slab shell and the copper plates, increasing the thickness of a solidified slab shell, improving the strength and growth informality of the solidified slab shell and achieving the purpose of preventing the longitudinal cracks in the surface of the casting slab.

Description

A kind of crystallizer that suppresses the Longitudinal Crack On Surface of Casting Slab line
Technical field
The utility model relates to the continuous casting of metal field, specially refers to a kind of method and crystallizer that suppresses the Longitudinal Crack On Surface of Casting Slab line.
Background technology
Longitudinal crack is one of common blemish of continuous casting billet, and the strand that such defect the occurs reconditioning of must rolling off the production line, affected rhythm of production, and serious longitudinal crack can make the monoblock slab scrap, and even in continuous casting production process, causes lobe bleed-out accident.Longitudinal Surface Cracks comes near the inhomogeneities of the initial solidification shell growth of crystallizer meniscus, on the strand width, when the suffered thermal stress of the base shell a little less than the local location relative thin and various transformation stress have exceeded its working strength, longitudinal crack just starts to occur, and follow-up solidify with cooling procedure in, this longitudinal crack also can further expand.At present; the control of longitudinal crack is mainly carried out from submersed nozzle, covering slag and three aspects of crystallizer, and the concrete measure in continuous casting production comprises that gate structure and immersion depth optimization, liquid level fluctuation of crystallizer are controlled, performance optimization and the stabilisation of covering slag, crystallizer is cooling and the optimization of vibration etc.But the high steel grade for some crack sensitivities, comprise low-alloy high-strength steel, peritectoid and inferior peritectic steel, micro-alloyed high strength steel etc., the surface longitudinal crack defect of slab and sheet billet does not still obtain stable control.
In fact; between solidified shell and crystallizer wall, the optimization of contact condition is the essential measure that the longitudinal crack defect is controlled; except the optimization of the mouth of a river and covering slag; the improvement of copper plate of crystallizer inner-cavity structure is also the effective ways of surface longitudinal crack defect, and its direction is to guarantee that the variation of copper plate working surface is suitable for the growth rhythm of solidified shell.In the billet continuous casting field, developed the crystallizer of many taperings such as double tapered, three taperings, four taperings and parabola taper, many taperings crystallizer more meets the growth rhythm of base shell on longitudinal shape, adapted to better the contraction that crystallizer is vertically gone up the base shell, making crystallizer vertically go up air gap thickness further reduces, alleviate the harmful effect of even having eliminated air gap, increased the heat-transfer effect of whole crystallizer, for Optimization of Continuous Casting provides assurance.
Along with the development of slab and sheet billet high-efficient continuous casting technology, the narrow face copper plate of crystallizer working face is also at the future development towards many taperings such as double tapered, three taperings and parabola tapers.
The people such as the Feng Ke of Zhongye Saidi Engineering Technology Co., Ltd have carried out simulation and prediction (Feng Ke to the theoretical tapering of continuous casting crystallizer for plate billet leptoprosopy, Han Zhiwei, Wang Yong, Mao Jinghua. the simulation and prediction of the theoretical tapering of continuous casting crystallizer for plate billet leptoprosopy. the iron and steel technology, the 2nd phase in 2008, pp15～16,35), result shows, the theoretical tapering of desirable crystallizer leptoprosopy should be along first increases and then decreases on short transverse, its variation tendency is along with the increase of throwing distance and mild gradually, and this appropriate design for the slab caster mould tapering provides important theory support.
Shrinking law and the tapering in crystallizer is studied (Zhao Jianwei to austenite and martensitic stainless steel base for the Zhao Jianwei of Taiyuan Iron & Steel (Group) Co., Ltd. and the people such as Wang Baofeng of University of the Inner Mongol, Wang Baofeng, fourth state. the research of austenite and martensitic stainless steel base shrinking law and conical degree of crystallizer in crystallizer. the Baotou Iron & Steel Inst journal, the 2nd phases 23 volume in 2005, pp127-129), result shows, the contraction of base shell in crystallizer presents significantly up big and down small trend, top at crystallizer, the contraction of martensite and austenitic stainless steel strand is respectively 2.65～2.13%/m, 2.04～1.67%/m, bottom at crystallizer, the contraction of martensite and austenitic stainless steel strand is respectively 1.25～1.22%/m, 1.04～1.05%/m, for this reason, design many taperings narrow copper plate and carried out commercial Application to improve slab quality.
The Zhang Hongbo of Tangshan Iron & Steel Co., Ltd. and the people such as Zhang Hui of Iron and Steel Research Geueral Inst conduct in-depth research (Zhang Hongbo to sheet blank continuous casting with crystallizer technology, Yang Jie, Zhang Hui, Deng. research and the optimization of crystallizer technology for sheet blank continuous casting. continuous casting, the 2nd phase in 2008, pp30～34), result shows, many taperings set-up mode of crystallizer leptoprosopy is applicable to the solidification shrinkage characteristic of peritectic steel very much, is conducive to the control of casting billet surface lobe.
At present, in the sheet billet continuous casting field, the optimization of crystallizer internal cavity improves the design that generally concentrates on the narrow copper plate shape of working surface, or, by the minor alteration of narrow copper plate upper and lower opening width, makes the back draught that has 1～2mm on the slab thickness direction.Document and patent about wide copper plate working surface improved shape of sheet slab continuous cast mold have no report.And in fact, the leptoprosopy shape of working surface is limited for the influence degree of wide base shell, especially the larger slab for width, the extruding force on narrow copper plate top is difficult to be transferred to the middle part of the initial solidification shell that intensity is very low, thereby loses the control effect to strand middle part surface lobe.The funnel-form crystallizer technology is widely used in sheet blank continuous casting production, has declared many patents both at home and abroad.Funnel-form crystallizer is that the conventional panels blank continuous casting crystallizer contraction process that cross section is shortened by length from top to bottom is converted into to crystallizer hopper zone convexity from large to small by rational surf deform; insertion for submersed nozzle provides enough spaces on the one hand; the molten state of guaranteeing covering slag between the mouth of a river and copper wall meets evenly lubricated needs, shrinks for the heat transfer of solidified shell, growth and rational distortion the condition of having created on the other hand.The funnel-form crystallizer technology has been brought into play important function in the high efficiency continuous casting production of sheet billet and the control of casting billet surface lobe, but, because larger, wide copper coin meniscus surface area of narrow face copper plate of crystallizer wearing and tearing corrodes many-sided reasons such as very fast, the surface longitudinal crack defect of sheet billet is fundamentally not controlled yet.
Summary of the invention
The purpose of this utility model is to provide a kind of crystallizer of effective inhibition Longitudinal Crack On Surface of Casting Slab line.
In order to achieve the above object, the utility model adopts following technical scheme:
A kind of crystallizer that suppresses the Longitudinal Crack On Surface of Casting Slab line, be applicable to the slab that thickness is 100～450mm, this crystallizer comprises a pair of wide copper coin and a pair of narrow copper plate, the working face top of described wide copper coin is comprised of the curved regions 1 that occupy the copper coin middle part and the plane area 2 that occupy the copper coin both sides, bottom consists of plane area 3, part apart from wide copper coin upper limb 60～120mm on curved regions 1 is meniscus surface area, described wide copper coin has the curved regions 1 of following structure: on the throwing direction, the depth of recess D2 of curved regions 1 reduces continuously, the slab thickness of crystallizer upper area is reduced from top to bottom gradually.
The maximum taper of described meniscus surface area is 0.8%/m～2.0%/m.
Described curved regions 1 shared ratio on the copper coin width is 40%～90%, and on short transverse, shared ratio is 15%～40%.
The vertical line style of described wide copper coin vertical section on curved regions 1 consists of broken line 4 or curve 5, and wherein, broken line 4 or curve 5 are 2～30mm at the maximum slope D1 of wide copper coin upper limb.
When the vertical line style of described wide copper coin vertical section on curved regions 1 consists of broken line 4, wherein the transition of each line segment adopts curve 6 to be smoothly connected.
The horizontal line style of described curved regions 1 consists of curve 7, and along with the increase of the distance of distance center line or copper coin upper limb, curve 7 constantly reduces with the distance B 2 of plane area 2 datum levels.
The symmetrical curve that the horizontal line style of described curved regions 1 is comprised of the symmetrical curve formed for parabola or circular arc line.
Horizontal line style and the both sides plane area 2 of described curved regions 1 are smoothly connected.
The beneficial effects of the utility model are: the utility model is by optimizing the inner-cavity structure of Wide-surface copper plate of crystallizer, wide copper coin of many taperings forms such as employing double tapered, three taperings and parabola taper adapts to the shrinking law of wide solidified shell, increased the local tapering in meniscus district simultaneously, be conducive to reduce the air gap between initial solidification base shell and copper coin, improve the uniformity of thickness, intensity and the growth thereof of solidified shell, reach the purpose that prevents that surface longitudinal crack of slab from producing.
The accompanying drawing explanation
Wide copper coin upper limb cross-sectional structure dimensional drawing of Fig. 1;
Wide copper coin upper funnel district cross-sectional structure dimensional drawing of Fig. 2;
Flat region, wide copper coin bottom of Fig. 3 cross-sectional structure dimensional drawing;
Wide copper coin central lateral plane physical dimension figure of Fig. 4;
The vertical line style design drawing of wide copper coin vertical section of Fig. 5 on curved regions;
Transient mode schematic diagram in the vertical line style of Fig. 6 between each broken line;
Wide copper coin cross section of Fig. 7 is at the horizontal line style design drawing on working face top;
The perspective view of wide copper coin of Fig. 8.
[primary clustering symbol description]
The curved regions on the working face top of 1 copper coin
The plane area on 2 both sides, copper plate working surface tops
The plane area of 3 copper plate working surface bottoms
The vertical line style formed by broken line of 4 curved regions 1
The vertical line style formed by curve of 5 curved regions 1
The easement curve of each line segment in 6 broken lines 4
The horizontal line style formed by curve of 7 curved regions 1
D1 broken line 4 or curve 5 are at the maximum slope D1 of copper coin upper limb, mm
The distance of D2 curve 7 and plane area 2 datum levels, mm
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further.The utility model is not limited to following examples.
Wide-surface copper plate of crystallizer of the present utility model is mainly for the control of slab longitudinal surface crack defect, and on the throwing direction, the slab thickness of crystallizer upper area reduces from top to bottom gradually.
The upper limb cross-sectional structure dimensional drawing of wide the copper coin of plate slab crystallizer that Fig. 1 is meniscus tapering raising of the present utility model, wherein, the working face top of wide copper coin is hopper zone, curved regions 1 and plane area 2, consists of, curved regions 1 occupy the copper coin middle part, and plane area 2 occupy the both sides of copper coin; The working face bottom consists of plane area 3; Wherein, curved regions 1 proportion on the copper coin width is 40%～90%.Wherein, the curved regions apart from wide copper coin upper limb 60～120mm is meniscus surface area.
The cross-sectional structure dimensional drawing in the upper funnel district that Fig. 2 is wide copper coin, along with the increase of the distance of distance center line, the horizontal line style 7 formed by curve in curved regions 1 and the distance B 2 of plane area 2 datum levels, the depth of recess of curved regions 1 constantly reduces.The cross-sectional structure dimensional drawing of the flat region, bottom that Fig. 3 is wide copper coin.Fig. 4 is wide copper coin central lateral plane physical dimension figure, and wherein, curved regions 1 shared ratio on the copper coin short transverse is 15%～40%.
The utility model, by increasing near the local tapering of meniscus, reduces the air gap between solidified shell and copper coin, realizes the raising of nascent shell thickness and intensity.Wherein, at distance copper coin upper limb different distance place, the computing formula of the local tapering of crystallizer curved regions is as follows:
▿ = a 1 - a 2 a 1 × Δh × 100 %
In formula:
Figure DEST_PATH_GDA0000393030710000062
-be the x place apart from crystallizer upper limb distance local tapering, %/m
The micro unit height that △ h-take position, distance crystallizer upper limb x place is upper and lower symmetric points, mm;
A 1-long apart from the curved regions working face curve that is x-0.5 △ h place apart from the crystallizer upper limb, mm;
A 2-long apart from the curved regions working face curve that is x+0.5 △ h place apart from the crystallizer upper limb, mm;
Obviously, gradient D1 is larger, and the local tapering of upper area crystallizer curved regions 1 is larger.The local tapering of the maximum of copper coin crystallizer meniscus surface area reaches 0.8%/m～2.0%/m.
Fig. 5 is the vertical line style design drawing of wide copper coin vertical section on curved regions 1, wherein, this curve can be vertical line style 4 that broken line forms, it can be also vertical line style 5 that curve forms, as a is double tapered broken line structure, b is three tapering broken line structures, and c is curve form, wherein, broken line 4 or curve 5 are 2～30mm at the maximum slope D1 of wide copper coin upper limb; Along with the increase of the distance of distance copper coin upper limb, the horizontal line style 7 that curved regions 1 consists of curve constantly reduces with the distance B 2 of plane area 2 datum levels.
Fig. 6 is the vertical transient mode between each broken line in line style in Fig. 5, between broken line, adopts easement curve 6 to be smoothly connected.
Fig. 7 is the horizontal line style design drawing of copper coin cross section on working face top, wherein, this horizontal line style can be the symmetrical curve that parabola forms as a, can be also that middle part is the symmetrical curve that convex arc line, the both sides circular arc line that is the concave arc line forms as b, horizontal each curve shown in Fig. 7 is for being smoothly connected, and curve and both sides plane area 2 are also for being smoothly connected.
The structural representation that Fig. 8 is the Wide-surface copper plate of crystallizer that the utility model proposes.
Wide the copper coin the utility model proposes can be combined to form crystallizer with the difformity narrow copper plate, for pouring into a mould the slab of thickness 100～450mm, is particularly useful for the control of the slab longitudinal surface crack that crack sensitivity is strong.In actual the use, the width of copper coin curved regions should be not less than the minimum widith in the whole specifications of strand in continuous casting production.

Claims (8)

1. a crystallizer that suppresses the Longitudinal Crack On Surface of Casting Slab line, be applicable to the slab that thickness is 100～450mm, this crystallizer comprises a pair of wide copper coin and a pair of narrow copper plate, it is characterized in that: the working face top of described wide copper coin is comprised of the curved regions (1) that occupy copper coin middle part and the plane area (2) that occupy the copper coin both sides, bottom consists of plane area (3), in the upper part apart from wide copper coin upper limb 60～120mm of curved regions (1), it is meniscus surface area, described wide copper coin has the curved regions (1) of following structure: on the throwing direction, the depth of recess D2 of curved regions (1) reduces continuously, the slab thickness of crystallizer upper area is reduced from top to bottom gradually.
2. crystallizer as claimed in claim 1, it is characterized in that: the maximum taper of described meniscus surface area is 0.8%/m～2.0%/m.
3. crystallizer as claimed in claim 1, it is characterized in that: described curved regions (1) shared ratio on the copper coin width is 40%～90%, and on short transverse, shared ratio is 15%～40%.
4. crystallizer as claimed in claim 1, it is characterized in that: the vertical line style of described wide copper coin vertical section on curved regions (1) consists of broken line (4) or curve (5), wherein, broken line (4) or curve (5) are 2～30mm at the maximum slope D1 of wide copper coin upper limb.
5. crystallizer as claimed in claim 1 is characterized in that: when the vertical line style of described wide copper coin vertical section on curved regions (1) consists of broken line (4), wherein the transition of each line segment adopts curve (6) to be smoothly connected.
6. crystallizer as claimed in claim 1, it is characterized in that: the horizontal line style of described curved regions (1) consists of curve (7), along with the increase of the distance of distance center line or copper coin upper limb, curve (7) constantly reduces with the distance B 2 of plane area (2) datum level.
7. crystallizer as claimed in claim 1, is characterized in that: the symmetrical curve that the horizontal line style of described curved regions (1) is comprised of the symmetrical curve formed for parabola or circular arc line.
8. crystallizer as claimed in claim 1, it is characterized in that: the horizontal line style of described curved regions (1) and both sides plane area (2) are smoothly connected.
CN 201320338858 2013-06-14 2013-06-14 Crystallizer for restraining longitudinal cracks in continuous casting slab Expired - Lifetime CN203356554U (en)

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