CN109822065B - Wide-surface copper plate of continuous casting crystallizer and continuous casting crystallizer with same - Google Patents
Wide-surface copper plate of continuous casting crystallizer and continuous casting crystallizer with same Download PDFInfo
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- CN109822065B CN109822065B CN201910288863.6A CN201910288863A CN109822065B CN 109822065 B CN109822065 B CN 109822065B CN 201910288863 A CN201910288863 A CN 201910288863A CN 109822065 B CN109822065 B CN 109822065B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 88
- 239000010949 copper Substances 0.000 title claims abstract description 88
- 238000009749 continuous casting Methods 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 5
- 208000029154 Narrow face Diseases 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 20
- 238000007711 solidification Methods 0.000 abstract description 7
- 230000008023 solidification Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 4
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- 230000035882 stress Effects 0.000 description 9
- 230000003321 amplification Effects 0.000 description 7
- 238000003199 nucleic acid amplification method Methods 0.000 description 7
- 230000008646 thermal stress Effects 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000008642 heat stress Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The invention discloses a wide-surface copper plate of a continuous casting crystallizer and the continuous casting crystallizer with the copper plate, and belongs to the technical field of ferrous metallurgy continuous casting. The cooling surface is arranged opposite to the working surface, a water tank is arranged in the cooling surface, at least one corrugated protruding entity from the bottom end is arranged on the working surface along the vertical direction, the vertical surface where the central line of the corrugated protruding entity is located passes through the water tank, the diameter of the corrugated protruding entity is increased from top to bottom to a larger diameter Dj from a pointed head, and the height is increased from top to bottom to a larger height Hj from a smaller height Hi. The change of the working surface of the wide copper plate is suitable for the solidification shrinkage rule of the blank shell, so that the transverse heat transfer is uniform, the temperature gradient between adjacent rib plates at the same height of the wide copper plate is reduced, the tensile stress between the transverse blank shells is further weakened, and the defect of longitudinal cracks of the blank in the inner plate of the crystallizer is overcome.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy continuous casting, and particularly relates to a wide-surface copper plate of a continuous casting crystallizer and the continuous casting crystallizer with the copper plate.
Background
The crystallizer is a very important part of a continuous casting machine and is a forcedly water-cooled bottomless ingot mould, and the performance of the crystallizer plays a vital role in improving the continuous casting productivity, maintaining the normal production of the continuous casting process and ensuring the quality of casting blanks. Thus, the solidification process of molten steel in a mold, known as the "heart" of a continuous casting apparatus, is a process of dynamic coupling of collecting flow, heat transfer and stress strain. The molten steel is subjected to strong cooling effect of cooling water of the crystallizer to form an initial solidified blank shell, and the contact heat transfer condition of the solidified shell and the wall of the crystallizer is changed due to the generation of an air gap, so that the thickness of the blank shell is unevenly distributed in the crystallizer, and stress concentration is more easily generated at the thinner part of the blank shell, so that cracks and even steel leakage are caused.
Surface longitudinal cracks are one of the most serious defects in thin slab continuous casting. The longitudinal crack on the surface of the sheet billet is influenced by the heat transfer of a crystallizer, the shape of the crystallizer, the flow of molten steel, the thickness of a casting blank, the pulling speed, the condition of covering slag in the crystallizer, the composition of molten steel and the like. In order to reduce longitudinal cracks on the surface of a slab, specific measures on continuous casting production comprise optimization of a water gap structure and immersion depth, control of fluctuation of a liquid level of a crystallizer, optimization and stabilization of casting powder performance, optimization of cooling and vibration of the crystallizer, and the like, but the basic measure of the control of the longitudinal crack defects on the surface of the slab is the change of the shape of a contact surface between a solidified blank shell and the wall of the crystallizer, so the longitudinal crack defects on the surface of the slab can be controlled by improving the inner cavity structure of a copper plate of the crystallizer, for example, chinese patent 200920035404.9 discloses a slab crystallizer with four corners of the cross section of a rectangular inner cavity as arc transition surfaces, both ends of the arc transition surfaces are smoothly transited with copper plates with wide surfaces and narrow surfaces respectively, the temperature of corners of the continuous casting slab is improved from original two-dimensional heat transfer to quasi-one-dimensional heat transfer, and the deformation of the corners and the nearby areas in the rolling process is nearly consistent; as further disclosed in chinese patent No. 201320338858.X, a crystallizer for inhibiting longitudinal cracks on the surface of a continuous casting slab is disclosed, and the crystallizer adopts multiple taper forms such as double taper, triple taper, parabolic taper and the like in the middle of a wide copper plate to adapt to the shrinkage rule of a wide solidified slab shell.
In the field of slab continuous casting, optimization and improvement of the inner cavity of a crystallizer are generally focused on design of the shape of the working surface of a narrow-surface copper plate, and in fact, the influence degree of the shape of the working surface of the narrow-surface copper plate on a wide-surface shell is limited, especially for slabs with large width, the extrusion force of the upper part of the narrow-surface copper plate is difficult to transmit into the initial solidification shell with low strength, so that the control effect on the longitudinal crack of the surface of a casting blank is lost. In previous studies, the design of the crystallizer only considered the effect of shrinkage law along the direction of drawing the billet on the growth of the billet, but not the effect of the transverse air gap on the growth of the billet, the mathematical simulation is as shown in fig. 1 below: on the working surface of the wide-surface copper plate, along with the increase of the cooling water flow rate, the larger the temperature difference between the copper plate on the upper part of the water tank through which the water flows and the adjacent rib plates (the copper plate bodies between the two adjacent water tanks) is, the temperature of the upper part of the water tank is obviously lower than the temperature of the rib plates at the same height. The temperature gradient exists on the cross section caused by the temperature difference, so that the tensile stress exists on the initial blank shell of the cross section, and longitudinal cracks are generated on the surface of the blank.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems that the temperature gradient on the cross section of a wide copper plate of a crystallizer is not considered in the prior art, and the local stress of a billet is easily caused to be too large, so that the billet is cracked, the invention provides the wide copper plate of the continuous casting crystallizer and the continuous casting crystallizer with the copper plate, which reduce the temperature gradient between adjacent rib plates at the same height of the wide copper plate, further weaken the tensile stress between billet shells in the transverse direction, and further eliminate the defects of longitudinal cracks of the billet in the inner plate of the crystallizer.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the wide-surface copper plate of the continuous casting crystallizer comprises a working surface and a cooling surface, wherein the cooling surface is arranged corresponding to the working surface, a water tank is arranged in the cooling surface, at least one corrugated raised entity from the bottom end is arranged on the working surface along the vertical direction, and the vertical surface where the central line of the corrugated raised entity is positioned penetrates through the water tank, so that the change of the working surface of the wide-surface copper plate is suitable for the solidification shrinkage rule of a blank shell, the transverse heat transfer is uniform, and the temperature gradient between adjacent rib plates at the same height of the wide-surface copper plate is reduced.
In one possible embodiment of the present invention, the corrugated raised body is semicircular in shape, increasing in diameter from top to bottom from a pointed head to a larger diameter Dj, and increasing in height from top to bottom from a smaller height Hi to a larger height Hj.
In one possible embodiment of the present invention, the corrugated raised body penetrates through the whole vertical working surface from top to bottom; or the distance between the pointed head of the corrugated bulge entity and the vertical top of the working surface is 25-35% of the height of the wide-surface copper plate, and the bottom of the corrugated bulge entity is flush with the end surface of the working surface.
In one possible embodiment of the present invention, the center line of the water tank and the center line of the corrugated raised solid are in the same vertical plane.
In one possible embodiment of the present invention, the diameter of the corrugated raised entity increases linearly with an increase of 1mm < -DeltaR <30mm; the height of the corrugated bulge entity is linearly increased, the amplification is 2mm < -delta H <10mm, the height is increased from top to bottom, and the solidification shrinkage rule of the steel billet is met.
In one possible implementation manner of the invention, the material of the corrugated raised entity is consistent with that of the wide-surface copper plate; or the corrugated raised entity and the wide copper plate are integrally cast and formed.
In one possible embodiment of the present invention, when the number of the corrugated raised bodies is not less than two, the distance between two adjacent corrugated raised bodies is 3mm < d <50mm.
In a possible implementation mode of the invention, the joint of the corrugated bulge entity and the working surface is an arc chamfer, the radius of the arc chamfer is 25-35% of the radius of curvature of the corresponding corrugated bulge entity, so that two-dimensional heat transfer at the corner is prevented, the two-dimensional heat transfer is converted into quasi-one-dimensional or local zero-dimensional heat transfer, and the temperature of the corner is improved; the temperature difference is reduced, and the generation of thermal stress is further reduced.
Another object of the present invention is to provide a continuous casting mold comprising a wide-surface copper plate and a narrow-surface copper plate, wherein the wide-surface copper plate is the wide-surface copper plate.
In one possible embodiment of the present invention, the narrow-face copper plate and the wide-face copper plate are in arc chamfer transition at the corners.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the wide-surface copper plate of the continuous casting crystallizer, the corrugated raised entity is arranged on the working surface of the wide-surface copper plate, and has certain structural requirements, molten steel flows from the upper end to the lower end of the wide-surface copper plate, so that the temperature gradient between adjacent rib plates (copper plate bodies between two adjacent water tanks) at the same height of the wide-surface copper plate is reduced on the basis of not affecting the shape of a steel billet, and the tensile stress between transverse blank shells is weakened, so that the defect of longitudinal cracks of a blank in the inner plate of the crystallizer is eliminated, and the quality of the blank in the crystallizer is ensured;
(2) According to the wide-surface copper plate of the continuous casting crystallizer, the form of the corrugated raised entity of the working surface of the wide-surface copper plate of the crystallizer is optimized, the depth of the corrugated raised entity of the adjacent waves is continuously reduced, the shrinkage rule of a wide-surface solidified blank shell is adapted, the air gap between the initial solidified blank shell and the copper plate is reduced, the growth uniformity, thickness and strength of the solidified blank shell are improved, and the purpose of preventing longitudinal cracks from being generated on the surface of a casting blank is achieved;
(3) According to the wide-surface copper plate of the continuous casting crystallizer, through the arrangement of the corrugated raised entity, the contact area of the steel billet and the copper plate is increased, the heat exchange efficiency is enhanced, the steel billet cooling is accelerated, and the cooling effect of the steel billet is good;
(4) The wide-surface copper plate of the continuous casting crystallizer, wherein the central line of the water tank and the central line of the corrugated raised entity are in the same vertical plane, so that the temperature difference between the copper plate on the upper part of the water tank and the adjacent rib plates (the copper plate body between the two adjacent water tanks) can be further reduced, the temperature gradient is reduced, and the tensile stress of the initial blank shell with the cross section is reduced;
(5) The wide-surface copper plate of the continuous casting crystallizer provided by the invention has the advantages that the height of the corrugated raised entity is linearly increased, the linear increase comprises linear increase, convex curve increase or concave curve increase, the increase is 2mm < -delta H <10mm, the height is increased from top to bottom, and the solidification shrinkage rule of a steel billet is met;
(6) According to the wide-surface copper plate of the continuous casting crystallizer, the material of the corrugated raised entity is consistent with that of the wide-surface copper plate, so that the cooling consistency of the crystallizer is ensured, and the corrugated raised entity and the wide-surface copper plate are integrally cast and formed, so that the wide-surface copper plate is convenient to process, relatively simple to produce and relatively high in adaptability;
(7) The joint of the corrugated bulge entity and the working surface is an arc chamfer, the radius of the arc chamfer is 25-35% of the radius of curvature of the corresponding corrugated bulge entity, two-dimensional heat transfer at the corner is prevented from being converted from two-dimensional heat transfer to quasi-one-dimensional or local zero-dimensional heat transfer, and the temperature of the corner is improved; the temperature difference is reduced, and the generation of thermal stress is further reduced.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a graph showing the temperature distribution of a wide-face copper plate at different cooling water flow rates;
FIG. 2 is a schematic structural view showing an embodiment of a wide-face copper plate of a continuous casting mold according to the present invention;
fig. 3 is a schematic structural view of another embodiment of a wide-face copper plate of a continuous casting mold according to the present invention;
fig. 4 is a front view of fig. 2;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 7 is a top view of FIG. 3;
fig. 8 is an enlarged view of a portion B of fig. 4.
The figure indicates:
100. a wide-face copper plate; 110. a working surface; 120. a cooling surface; 130. a corrugated raised solid; 140. a water tank; 150. and a joint.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the invention may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
The following detailed description and example embodiments of the invention may be better understood when read in conjunction with the accompanying drawings, in which elements and features of the invention are identified by reference numerals.
Example 1
As shown in fig. 2 to 8, in the wide-surface copper plate 100 of the continuous casting crystallizer according to the present invention, the wide-surface copper plate 100 includes a working surface 110 and a cooling surface 120, the cooling surface 120 is disposed corresponding to the working surface 110, a water tank 140 is disposed in the cooling surface 120, the water tank 140 is connected to a source of cooling water, at least one corrugated boss entity 130 starting from a bottom end is disposed on the working surface 110 along a vertical direction, in this embodiment, the number of corrugated boss entities 130 is identical to that of the water tank 140, and a vertical surface where a center line of the corrugated boss entity 130 is located passes through the water tank 140, preferably, the center line of the water tank 140 and the center line of the corrugated boss entity 130 are in the same vertical plane, and the corrugated boss entity 130 not only can increase a contact area, but also can form a spacer between the water tank 140 and a billet, so that a change of the working surface 110 of the wide-surface copper plate 100 is suitable for a shrinkage rule of a blank shell, and a heat transfer is uniform in a lateral direction, thereby reducing a temperature gradient between adjacent rib plates at the same height of the wide-surface copper plate 100.
In comparison, although chinese patent 200920035404.9 discloses a slab crystallizer with four corners of a rectangular inner cavity cross section as arc transition surfaces, two ends of the arc transition surfaces of the patent are respectively in smooth transition with wide-surface and narrow-surface copper plates, because the corners of a continuous casting billet are changed from original two-dimensional heat transfer to quasi-one-dimensional heat transfer, the temperature of the corners is improved, the deformation of the corners and the nearby area in the rolling process approaches to be consistent, only the corners are considered in the practical type, and the influence of the temperature gradient between adjacent rib plates of the wide-surface copper plate 100 of the crystallizer at the same height on the heat transfer and growth of the billet shell is not considered, so that the influence of the heat stress of the billet generated by the crystallizer at the same transverse plane can not be relieved, and the heat stress of the billet is uneven.
In addition, chinese patent 201320338858.X discloses a crystallizer for inhibiting longitudinal cracks on the surface of a continuous casting slab, where the crystallizer adopts multiple taper forms such as double taper, triple taper and parabolic taper in the middle of a wide copper plate 100 to adapt to the shrinkage rule of a wide solidified slab shell. However, only the relief of the overall thermal stress of the generated steel billet is considered, and the local thermal stress of the steel billet generated by the crystallizer is not considered, and particularly, substances such as steel slag and the like are more easily generated at the taper and plane included angle positions, so that the stress of the steel billet is concentrated.
It is emphasized that: the inventor of the present invention considers the thermal stress influence between materials on the transverse plane in the whole continuous casting process of the billet; it is also contemplated that the use of rounded transitions at localized locations, particularly at the corners, reduces the impact of thermal stress in the concentration.
According to the wide copper plate 100 of the continuous casting crystallizer, on one hand, the optimization of the structure of the wide copper plate 100 reduces the temperature gradient between adjacent rib plates at the same height of the wide copper plate 100, so that the tensile stress between blank shells in the transverse direction is weakened; on the other hand, by optimizing the form of the lower corrugation of the working surface 110 of the wide-surface copper plate 100 of the crystallizer and continuously reducing the depth of the convex curved surface of the adjacent waves, the shrinkage rule of the blank shell is adapted, the air gap between the initial solidified blank shell and the copper plate is reduced, the growth uniformity, thickness and strength of the solidified blank shell are improved, and the purpose of preventing longitudinal cracks from being generated on the surface of a casting blank is achieved.
As shown in fig. 2 to 4, the corrugated raised solid 130 is a semicircle whose diameter increases from a pointed head to a larger diameter Dj from top to bottom, and the height increases from a smaller height Hi to a larger height Hj from top to bottom.
The diameter of the corrugated raised entity 130 may increase linearly, i.e. the corrugated raised entity 130 is part of a cone shape. As an alternative construction, a convex or concave enlarged corrugated raised body 130 is employed. The diameter of the corrugated raised entity 130 increases linearly with an amplification of 1mm < [ delta ] R <30mm, a specific amplification [ delta ] R of 1mm, 2mm, 5mm, 8mm, 10mm, 15mm, 20mm, 25mm, 28mm and 30mm, a preferred amplification of 2mm < [ delta ] R <15mm; the height of the corrugated raised entity 130 increases linearly, the amplification is 2mm < -delta H <10mm, the specific amplification delta H is 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm, the preferred amplification is 5mm < -delta H <8mm, the height is increased from top to bottom, and the solidification shrinkage rule of the billet is met.
The corrugated raised body 130 has two forms of structure: as shown in fig. 3 and 7, the first extends from top to bottom throughout the vertical working surface 110; as shown in fig. 2 and 5, the distance between the pointed head of the second type of corrugated raised entity 130 and the vertical top of the working face 110 is 25-35% of the height of the wide-face copper plate 100, and the bottom is flush with the end face of the working face 110.
In addition, the corrugated raised solid 130 may be non-semicircular with smooth surfaces.
The material of the corrugated raised entity 130 in this embodiment is consistent with that of the wide copper plate 100, and further, the corrugated raised entity 130 and the wide copper plate 100 are cast integrally, so that the wide copper plate 100 of the crystallizer has low manufacturing cost and convenient processing.
In this embodiment, when the number of the corrugated raised bodies 130 is not less than two, the spacing between two adjacent corrugated raised bodies 130 is 3mm < D <50mm, and specific D is 3mm, 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm, and 50mm.
In order to prevent two-dimensional heat transfer still existing at the corner, the two-dimensional heat transfer is converted into quasi-one-dimensional or local zero-dimensional heat transfer, and the temperature of the corner is improved; the temperature difference is reduced, and thus the generation of thermal stress is reduced, the joint 150 between the corrugated boss entity 130 and the working surface 110 is an arc chamfer, and the radius of the arc chamfer is 25-35% of the radius of curvature of the corresponding corrugated boss entity 130.
The continuous casting crystallizer comprises a wide copper plate 100 and a narrow copper plate, wherein the wide copper plate 100 is the wide copper plate 100, and the narrow copper plate and the wide copper plate 100 are in arc chamfer transition at corners.
Claims (3)
1. A wide copper plate (100) of continuous casting crystallizer, wide copper plate (100) include working face (110) and cooling surface (120), cooling surface (120) set up with working face (110) correspondence, cooling surface (120) built-in have basin (140), its characterized in that: at least one corrugated bulge entity (130) is arranged on the working surface (110) along the vertical direction from the bottom end, and the vertical surface where the central line of the corrugated bulge entity (130) is positioned passes through the water tank (140);
the corrugated raised body (130) is semi-circular, increasing in diameter from top to bottom from a pointed head to a larger diameter Dj, and increasing in height from top to bottom from a smaller height Hi to a larger height Hj;
the corrugated bulge entity (130) penetrates through the whole vertical working surface (110) from top to bottom; or the distance between the pointed head of the corrugated bulge entity (130) and the vertical top of the working surface (110) is 25-35% of the height of the wide-surface copper plate (100), and the bottom is flush with the end surface of the working surface (110);
the central line of the water tank (140) and the central line of the corrugated bulge entity (130) are in the same vertical plane;
the diameter of the corrugated raised entity (130) increases linearly; the height of the corrugated raised bodies (130) increases linearly;
the material of the corrugated raised entity (130) is consistent with that of the wide copper plate (100); or the corrugated raised entity (130) and the wide copper plate (100) are integrally cast and formed;
when the number of the corrugated raised entities (130) is not less than two, the distance between every two adjacent corrugated raised entities (130) is 3mm < D <50mm;
the joint (150) of the corrugated bulge entity (130) and the working surface (110) is an arc chamfer, and the radius of the arc chamfer is 25-35% of the radius of curvature of the corresponding corrugated bulge entity (130).
2. The utility model provides a continuous casting crystallizer, includes wide copper (100) and narrow copper, its characterized in that: the wide copper plate (100) is the wide copper plate (100) according to claim 1.
3. The continuous casting mold according to claim 2, characterized in that: the narrow-face copper plate and the wide-face copper plate (100) are in arc chamfering transition at the corners.
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109822065A (en) | 2019-05-31 |
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