CN211921661U - Large-scale electroslag furnace high-strength cooling directional solidification crystallizer - Google Patents
Large-scale electroslag furnace high-strength cooling directional solidification crystallizer Download PDFInfo
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Abstract
The utility model discloses a large-scale electroslag furnace high strength cooling directional solidification crystallizer belongs to the metallurgical technical field of electroslag special type, has solved among the prior art that the current condition of solidification of super large diameter electroslag spindle worsens the solidification direction that leads to and easily appears loose shrinkage cavity scheduling problem. The utility model is a sectional type assembled crystallizer which is provided with a plurality of sections of crystallizer units, and the crystallizer units are detachable; the inner diameter of each section of crystallizer unit is uniformly increased from bottom to top, the inner diameter of the bottom end of the upper crystallizer unit is the same as the inner diameter of the top end of the lower crystallizer unit in the two adjacent crystallizer units, and the inclination of the inner surface of each section of crystallizer unit is consistent. The crystallizer of the utility model is suitable for the smelting of large electroslag ingots with the diameter exceeding 1600mm or the tonnage exceeding 60 tons.
Description
Technical Field
The utility model belongs to the technical field of electroslag special metallurgy, in particular to large-scale electroslag furnace high strength cooling directional solidification crystallizer.
Background
The homogenization solidification and internal quality control of large-diameter electroslag smelting are always the focus of attention of metallurgists. When the diameter of the electroslag ingot is increased, the defects of central shrinkage cavity, looseness and the like are easy to occur. Meanwhile, due to the deterioration of cooling conditions, the large electroslag ingot has axial cooling orientation, the segregation of components is more serious, and the stable control of the components of micro-alloying and the accurate control of elements easy to burn become difficult problems. How to control the smelting technological parameters of the large electroslag furnace and reduce the influence of the deterioration of the cooling condition on the solidification structure is a technological problem which needs to be solved urgently.
For the directional solidification and uniform solidification of an electroslag furnace, the diameter of a crystallizer aimed at in the prior art is small, or a method for quantifying the device and the method is not provided. The research on the aspects of uniform solidification and directional solidification of large electroslag does not provide a quantitative method, or has a certain difference with the uniform directional solidification of large-diameter electroslag smelting.
The utility model aims at providing a novel sectional type crystallizer that large-scale electroslag spindle (diameter is greater than or equal to 1600mm, or the tonnage is greater than or equal to 60 tons) used is smelted to electroslag furnace promotes the inside quality of solidifying of steel ingot, improves the element segregation, improves steel ingot utilization ratio and lumber recovery.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the utility model aims at providing a large-scale electroslag furnace high strength cooling directional solidification crystallizer for solve the solidification direction change that the current solidification condition of super large diameter electroslag ingot worsens and leads to and easily appear loose shrinkage cavity scheduling problem.
The purpose of the utility model is mainly realized through the following technical scheme:
a large-scale electroslag furnace high-strength cooling directional solidification crystallizer is a sectional type assembled crystallizer and is provided with a plurality of sections of crystallizer units, and the crystallizer units are detachable; the inner diameter of each section of crystallizer unit is uniformly increased from bottom to top, the inner diameter of the bottom end of the upper crystallizer unit is the same as the inner diameter of the top end of the lower crystallizer unit in the two adjacent crystallizer units, and the inclination of the inner surface of each section of crystallizer unit is consistent.
Furthermore, the crystallizer is suitable for smelting large electroslag ingots with the diameter of more than 1600mm or the tonnage of more than 60 tons.
Furthermore, a first crystallizer unit of the multi-section crystallizer unit is arranged at the bottom end of the crystallizer, and a second crystallizer unit is arranged at the upper part of the first crystallizer unit and is connected with the first crystallizer unit.
Furthermore, the diameter phi of the lower end of the first crystallizer unit is D, D is larger than or equal to 1600mm, the height of the first crystallizer unit is 0.5D, the height of the second crystallizer unit is 0.5D, and the heights of the rest crystallizer units are 0.25D.
Further, the crystallizer units are provided with 10 sections, and the heights of the crystallizer units in each section are 0.5D, 0.25D and 0.25D from bottom to top in sequence.
Furthermore, each section of crystallizer unit is provided with an independent cooling water area;
the joint of the adjacent two sections of crystallizer units is connected by an inner sleeve and an outer sleeve, the joint is sealed by a rubber strip, and water is introduced to cool the joint.
Furthermore, each section of crystallizer unit is assembled by two valve components which are fastened together through fastening connecting pieces; the two lobe members are provided with separate cooling water zones, respectively.
Furthermore, the crystallizer also comprises a crystallizer supporting column, and each section of crystallizer unit is fastened on the crystallizer supporting column.
Further, the crystallizer also comprises a crystallizer supporting seat and a crystallizer bottom cooling plate;
furthermore, the distance between the crystallizer bottom cooling plate and the crystallizer supporting seat is 0.1-2 cm.
Furthermore, a gap between the crystallizer bottom cooling plate and the crystallizer supporting seat is stabilized by a wedge.
Compared with the prior art, the utility model discloses can realize one of following technological effect at least:
1) the utility model discloses mainly surpass 1600mm or the tonnage to the diameter and surpass 60 tons large-scale electroslag ingot smelting, the utility model discloses the crystallizer is provided with multistage crystallizer unit, and crystallizer unit be detachable, can be when the enough pressure that supports the molten bath degree of depth of partial steel ingot solidification shell and not break, tears the crystallizer unit of molten bath below open, cools off the reinforcement. Compare in current a holistic, until congealing the crystallizer that the refining end just demolishd, the utility model discloses the crystallizer can improve cooling effect, through the intensive cooling to exposing the steel ingot after demolising the crystallizer, the solidification speed of molten bath lower part mushy district and the heat conduction of solidified shell, solidification with higher speed improves the inside solidification direction of ingot and more tends to the level, consequently improves the inside solidification quality of steel ingot, reduces the element segregation degree, reduces the inside loose and shrinkage cavity defect of major diameter electroslag ingot.
The inner diameter of each section of crystallizer unit is uniformly increased from bottom to top, the inclination of the inner surface of each section of crystallizer unit is consistent, and the crystallizer unit can be detached from the lower part.
2) In order to realize the utility model discloses multistage crystallizer unit is installed from the top down, the utility model discloses be provided with the crystallizer support column, every section crystallizer unit all is connected with the crystallizer support column.
3) The solidification condition of steel ingot bottom and riser portion is good when major diameter electroslag is smelted, and the cooling condition in steel ingot middle section worsens, the utility model discloses every crystallizer unit all is provided with independent cooling water district, can control alone, implements different cooling strength to the different positions of steel ingot for the performance at the different positions of steel ingot more tends to the unanimity. And the joint of the two crystallizer units is also provided with an independent cooling water area, the cooling strength of the cooling water area is consistent with that of the crystallizer below the cooling water area, and the solidification performance of the steel ingot at the joint is prevented from being deteriorated.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the figures.
FIG. 1 is a schematic cross-sectional view of a crystallizer;
FIG. 2 is a schematic top view of a crystallizer;
FIG. 3 is a schematic view of the junction of upper and lower crystallizer units.
Reference numerals
1-a crystallizer supporting seat; 2-crystallizer bottom cooling plate; 3-a crystallizer unit; 4-a crystallizer support column; 5-a first cooling water zone; 6-a second cooling water zone; 7-fastening the connecting piece; 8-a cooling water zone of the upper crystallizer unit; 9-rubber strip; 10-a cooling water zone at the joint of the two sections of crystallizer units; 11-cooling water zone of the lower crystallizer unit.
Detailed Description
A large-scale electroslag furnace high intensity cooling directional solidification crystallizer is described in further detail below with reference to specific examples, which are provided for comparison and explanation purposes only, and the present invention is not limited to these examples.
The utility model discloses a large-scale electroslag furnace high strength cooling directional solidification crystallizer and solidification technology, the utility model discloses mainly smelt to the large-scale electroslag ingot that the diameter exceeds 1600mm or the tonnage exceeds 60 tons, is applicable to slightly littleer electroslag ingot equally.
A large-scale electroslag furnace high-strength cooling directional solidification crystallizer is shown in figure 1 and comprises a crystallizer supporting seat 1, a crystallizer bottom cooling plate 2, a crystallizer unit 3 and a crystallizer supporting column 4.
The utility model discloses large-scale electroslag furnace high strength cooling directional solidification crystallizer is sectional type equipment crystallizer, is provided with multistage crystallizer unit 3, and 3 internal diameters of each section crystallizer unit are from up evenly increasing down, and 3 internal surface inclinations of each section crystallizer unit are unanimous. The inner surface increasing gradient angle should be no greater than 10 degrees.
The crystallizer unit 3 is sequentially a first crystallizer unit and a second crystallizer unit … … nth crystallizer unit from bottom to top; the first crystallizer unit is arranged at the bottom end of the crystallizer, and the second crystallizer unit is arranged at the upper part of the first crystallizer unit and is connected with the first crystallizer unit.
The diameter phi of the lower end of the crystallizer unit at the bottommost part is D, D is larger than or equal to 1600mm, the height of the crystallizer unit at the bottom part is 0.5D, the crystallizer unit is designed according to 0.25D above the height D, and the crystallizer unit is generally assembled in sections of 0.25D according to tonnage. The diameter is D, the solidification of the steel ingot within the height D is better, and the component distribution is relatively reasonable, so the heights of the bottom crystallizer unit and the middle crystallizer unit are set to be 0.5D; the solidification effect is poor above the height D, in order to strengthen the cooling effect, the height of the crystallizer unit above the height D is set to be 0.25D, and the cooling effect of the adjacent last section of crystallizer unit is also ensured by removing the next section of crystallizer unit and spraying water/water mist.
Illustratively, the diameter phi of the lower end of the first crystallizer unit is D, D is more than or equal to 1600mm, the height of the first crystallizer unit is 0.5D, the height of the second crystallizer unit is 0.5D, and the heights of the rest crystallizer units are 0.25D.
The basic design scheme according to the diameter/tonnage of the steel ingot is as follows:
the height of each section of crystallizer unit from bottom to top of a 60-ton crystallizer is as follows: 0.5D +0.5D +0.25D +0.25D +0.25D +0.25D +0.25D +0.25D +0.25D +0.25D, totaling 10 sections;
the number of the crystallizer unit sections can be properly increased or reduced by 0.25D according to the electroslag ingot type characteristics and the smelting requirement;
the finished crystallizer is designed, and when the tonnage of a smelting ingot is small, the number of sections for assembling 0.25D crystallizer units can be reduced.
As shown in fig. 3, the joint of the two sections of crystallizer units is connected by an inner sleeve and an outer sleeve, the joint is sealed by a rubber strip 9, each section of crystallizer unit is provided with an independent cooling water zone, the upper crystallizer unit comprises a cooling water zone 8 of the upper crystallizer unit, the lower crystallizer unit comprises a cooling water zone 11 of the lower crystallizer unit, and the joint is filled with cooling water to form a cooling water zone 10 at the joint of the two sections of crystallizer units. The joint is sealed by a rubber strip 9 and is watertight; the inner cylindrical surface is connected smoothly and closely, so that the steel leakage is avoided.
As shown in fig. 2, each section of crystallizer unit 3 is assembled by two petal members, and the two petal members are fastened together by a fastening connector 7; the two lobe members are provided with separate cooling water zones, namely a first cooling water zone 5 and a second cooling water zone 6, respectively. Each cooling water zone is provided with a separate water inlet and outlet.
The utility model discloses large-scale electroslag furnace high strength cooling directional solidification crystallizer adopts the facial make-up formula equipment mode to install to dismantle bottom crystallizer unit after the steel ingot solidifies. The installation steps are as follows:
firstly, fastening the uppermost crystallizer unit on a crystallizer support column 4, and fastening the uppermost crystallizer unit on the upper crystallizer unit and the upper crystallizer support column 4 in sequence from the upper crystallizer unit to the lower crystallizer unit;
and then, the crystallizer bottom cooling plate 2 is fastened on the crystallizer unit and the crystallizer supporting column 4 at the bottommost section, and after the crystallizer bottom cooling plate 2 is installed, the gap distance between the crystallizer bottom cooling plate 2 and the crystallizer supporting seat 1 is 0.1-1 cm, and 4-6 wedges are used for stabilizing the gap. And cooling water is introduced into the crystallizer bottom cooling plate 2 and is used for cooling the bottom of the steel ingot.
A crystallizer dismantling step: when the electroslag ingot is smelted to a required height and the crystallizer needs to be dismantled for enhanced cooling, the crystallizer bottom cooling plate 2 and a fastener of the previous section of crystallizer unit are dismantled, the wedge is removed, the crystallizer bottom cooling plate 2 falls on the crystallizer supporting seat 1, the solidified steel ingot falls along with the crystallizer bottom cooling plate 2 under the action of gravity, two parts of components of the first crystallizer unit are dismantled and removed respectively, and water spray cooling is carried out on the exposed steel ingot. And then sequentially disassembling the crystallizer units from bottom to top according to the smelting process and carrying out reinforced cooling on the bare steel ingot.
A solidification process of a large-scale electroslag furnace high-strength cooling directional solidification crystallizer comprises the following steps:
and 3, spraying water or water mist to the bare steel ingot for intensive cooling.
In view of the characteristics that the solidification conditions of the bottom and the riser part of the steel ingot are good and the cooling condition of the middle section of the steel ingot is deteriorated during large-diameter electroslag smelting, the conventional cooling water mostly adopts the same amount of cooling water, and the cooling conditions of different parts cannot be improved.
The cooling process of the step 1 of the utility model is divided into two types:
scheme A: in step 1, when water is used as a cooling medium, the cooling intensity of the first crystallizer unit is M, the cooling intensity of the second crystallizer unit is increased to 1.01-3M, and the cooling intensity of the third crystallizer unit is increased to (1.01-3)2M, the cooling intensity of the nth crystallizer unit is improved to (1.01 to 3)n-1M and n are the nth crystallizer unit from bottom to top; the cooling strength of the crystallizer unit at the riser part of the steel ingot is M, and the cooling strength of the crystallizer units at the sections above the riser part is consistent and is 0.5M-M.
The scheme A aims at the characteristics that the solidification conditions of the bottom and the riser part of a steel ingot are good and the cooling condition of the middle section of the steel ingot is deteriorated during large-diameter electroslag smelting, controls the lower cooling strength of the bottom and the riser part of the steel ingot, and improves the overall solidification effect of the steel ingot by gradually enhancing the cooling strength of a crystallizer unit from bottom to top so that the steel ingot tends to be consistent.
Scheme B: in step 1, when water is used as a cooling medium, the cooling intensity of the first crystallizer unit and the riser crystallizer unit is M, the cooling intensity of the crystallizer units above the riser is consistent and ranges from 0.5M to M, and the cooling intensity of all the remaining crystallizer units is set to be the same, namely, 1.01M to 3M.
The opening part can generate heat radiation, the cooling is better, and the cooling intensity is not required to be too high.
In step 2, when the solidified shell of the steel ingot is enough to support the pressure of the depth of the molten pool without cracking, namely the solidified shell at the connecting level of the upper and lower sections of the crystallizer units is more than or equal to 0.25D thickness, which can be determined by empirical prediction with the help of parameters such as melting speed, accumulation time, diameter and height of crystallizer, cooling intensity and the like (for the conventional molten pool shape with the total liquid phase depth of the molten pool of 0.6D, when the liquid level of the metal molten pool is higher than the connecting level of upper and lower crystallizer by 0.45D, the thickness of the blank shell at the position is more than or equal to 0.25D), or can be determined by more quantitative numerical simulation method (such as Meltflow-ESR, ANSYS and the like) in advance, aiming at ensuring that the blank shell is not damaged so as to prevent safety accidents, the crystallizer below the molten pool can be removed, water spray or water spray mist is used for enhanced cooling, and the water spray/mist amount Q is 0.001D-0.1D (D is taken according to unit mm, Q unit is m in the formula3Min), water flow/water mist is uniformly sprayed on the circumferential surface of the bare steel ingot, so that the growth direction of solidified dendritic crystals of a metallurgical melting pool is more horizontally directed, the solidified diameter interval is reduced, the solidified quality is improved, and the element segregation is improved, thereby improving the yield of the steel ingot.
The utility model discloses a crystallizer and process method is applicable to a series of varieties such as various alloy steel, stainless steel, heat-resisting steel, high-strength steel, can realize the even control to the inside solidification of major diameter electroslag, reduces the solidification dendrite spacing, reduces the element segregation degree, improves the utilization ratio of steel ingot.
Example 1
Crystallizer design and process selection:
the tonnage of the electroslag ingot is 100-120 tons, and the density of the electrode material is 7400-7600 kg/m3The equivalent electrode diameter is 1750mm, the crystallizer diameter phi is 2000mm, the total height of the crystallizer is 6000mm, and the height of each section from bottom to top is 1000mm +1000mm +500mm +500mm +500mm +500mm +500 mm; in the steady state stage of the electroslag smelting process, the smelting speed is set to be 1800Kg/h, the electrode changing time is less than or equal to 5min, and the slag height is 400 mm.
And cooling execution is performed by adopting the scheme B, wherein the water flow of the first crystallizer unit and the water flow of the riser crystallizer unit are n, and the water flow of the rest sections of crystallizers is set to be 1.9 n.
Combining numerical simulation, adopting parameters such as melting speed-accumulated time-crystallizer unit sectional height and the like, estimating the liquid level height and the depth of the molten pool by using Meltflow-ESR software, and averaging the depth of the molten pool according to experience as follows: 0.5m at the early stage, 1.2m at the steady state and 0.8m at the later stage.
In the smelting process, the first crystallizer units are disassembled at 1480min in sequence, at the moment, the weight of a steel ingot is 35 tons, the height of the steel ingot is 1.5m, and water is sprayed on the exposed steel ingot for cooling; the second crystallizer unit is removed in about 2450min, the weight of the steel ingot is 65 tons at the moment, the height of the steel ingot is 2.7m, and the newly exposed steel ingot is cooled by water spraying; removing the third crystallizer unit in about 2800min, wherein the weight of the steel ingot is 75 tons, the height of the steel ingot is 3.2m, and spraying water to cool the newly exposed steel ingot; removing the fourth crystallizer unit in about 3400min, wherein the weight of the steel ingot is 100 tons and the height is 4m, and spraying water for cooling the newly exposed steel ingot; and (5) no longer removing the crystallizer unit until the smelting is finished.
Solidification effect: the defects of looseness and shrinkage cavity are not found in the steel ingot (the sampling position is the riser end and the ingot tail end). Mainly comparing the diameter height, namely the solidification element segregation at the upper and lower parts of 2000 mm: the steel ingot height was 2000mm (melting weight: 47 tons), the degree of segregation of Cr element was 0.99 at a height of 1 to 3cm below the steel ingot surface, and the degree of segregation of Cr element was 1.016 at a height of 5000mm (melting weight: 117 tons) at a height of 1 to 3cm below the steel ingot surface, which resulted in a low degree of segregation and a good working effect.
Example 2
Crystallizer design and process selection:
the tonnage of the electroslag ingot is 100-120 tons, and the material density is 7400-7600 kg/m3The equivalent electrode diameter is 1750mm, the crystallizer diameter is 2000mm, the total height of the crystallizer is 6000mm, and the height of each section from bottom to top is 1000mm +1000mm +500mm +500mm +500mm +500mm +500 mm; the steady-state stage of the electroslag smelting process sets the smelting speed to 1800Kg/h, the electrode replacement time is less than or equal to 5min, the slag height is 400mm,
and cooling and executing by adopting the scheme A, wherein the water flow of the first crystallizer unit and the water flow of the riser crystallizer unit are n, and the water flow of the second crystallizer unit to the tenth crystallizer unit is sequentially increased by 1.05 times of that of the previous crystallizer unit and that of the next crystallizer unit.
Combining numerical simulation, adopting parameters such as melting speed-accumulated time-crystallizer unit sectional height and the like, estimating the liquid level height and the depth of the molten pool by using Meltflow-ESR software, and averaging the depth of the molten pool according to experience as follows: 0.5m at the early stage, 1.2m at the steady state and 0.8m at the later stage.
In the smelting process, the first crystallizer units are disassembled at 1480min in sequence, at the moment, the weight of a steel ingot is 35 tons, the height of the steel ingot is 1.5m, and water is sprayed on the exposed steel ingot for cooling; the second crystallizer unit is disassembled in 2700min, the weight of the steel ingot is 72 tons at the moment, the height of the steel ingot is 3.1m, and the newly exposed steel ingot is cooled by water spraying; removing the third crystallizer unit in about 2860min, wherein the weight of the steel ingot is 79 tons, the height of the steel ingot is 3.3m, and spraying water to cool the newly exposed steel ingot; removing the fourth crystallizer unit in 3500min, wherein the weight of the steel ingot is 100 tons and the height of the steel ingot is 4.2m, and spraying water to cool the newly exposed steel ingot; and (5) no longer removing the crystallizer unit until the smelting is finished.
Solidification effect: the defects of looseness and shrinkage cavity are not found in the steel ingot (the sampling position is the riser end and the ingot tail end). Mainly comparing the diameter height, namely the solidification element segregation at the upper and lower parts of 2000 mm: the steel ingot had a height of 2000mm (melting weight: 47 tons), a Cr element segregation degree of 0.99 at a position 1 to 3cm below the surface of the steel ingot, and a Cr element segregation degree of 1.012 at a height of 5000mm (melting weight: 117 tons) at a position 1 to 3cm below the surface of the steel ingot, and the steel ingot had good practical effects.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. The high-strength cooling directional solidification crystallizer for the large electroslag furnace is characterized in that the crystallizer is a sectional type assembled crystallizer and is provided with a plurality of sections of crystallizer units, and the crystallizer units are detachable; the inner diameter of each section of crystallizer unit is uniformly increased from bottom to top, the inner diameter of the bottom end of the upper crystallizer unit is the same as the inner diameter of the top end of the lower crystallizer unit in the two adjacent crystallizer units, and the inclination of the inner surface of each section of crystallizer unit is consistent.
2. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of claim 1, wherein the crystallizer is suitable for smelting large-scale electroslag ingots with the diameter exceeding 1600mm or the tonnage exceeding 60 tons.
3. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of claim 1, wherein a first crystallizer unit of the multi-section crystallizer unit is arranged at the bottom end of the crystallizer, and a second crystallizer unit is arranged at the upper part of the first crystallizer unit and connected with the first crystallizer unit.
4. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of claim 3, wherein the diameter phi of the lower end of the first crystallizer unit is D, D is larger than or equal to 1600mm, the height of the first crystallizer unit is 0.5D, the height of the second crystallizer unit is 0.5D, and the heights of the rest crystallizer units are 0.25D.
5. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of claim 4, wherein the crystallizer units are provided with 10 sections, and the heights of the crystallizer units in each section are 0.5D, 0.25D and 0.25D from bottom to top in sequence.
6. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of claim 1, wherein each section of crystallizer unit is provided with an independent cooling water zone;
the joint of the adjacent two sections of crystallizer units is connected by an inner sleeve and an outer sleeve, the joint is sealed by a rubber strip, and water is introduced to cool the joint.
7. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of any one of claims 1 to 6, wherein each section of crystallizer unit is assembled by two petal members, and the two petal members are fastened together by fastening connectors; the two lobe members are provided with separate cooling water zones, respectively.
8. The large-scale electroslag furnace high-intensity cooling directional solidification crystallizer of claim 3, wherein the crystallizer further comprises a crystallizer supporting column, and each section of crystallizer unit is fastened on the crystallizer supporting column.
9. The large-scale electroslag furnace high-intensity cooling directional solidification crystallizer of claim 8, wherein the crystallizer further comprises a crystallizer supporting seat and a crystallizer bottom cooling plate;
the crystallizer bottom cooling plate is simultaneously connected and fixed with the bottom of the first crystallizer unit and the crystallizer supporting column; the distance between the crystallizer bottom cooling plate and the crystallizer supporting seat is 0.1-2 cm.
10. The large-scale electroslag furnace high-strength cooling directional solidification crystallizer of claim 9, wherein a gap between the crystallizer bottom cooling plate and the crystallizer supporting seat is stabilized by a wedge.
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