CA1230733A - Method of electromagnetically stirring a molten steel in a mold for a continuous casting - Google Patents
Method of electromagnetically stirring a molten steel in a mold for a continuous castingInfo
- Publication number
- CA1230733A CA1230733A CA000474068A CA474068A CA1230733A CA 1230733 A CA1230733 A CA 1230733A CA 000474068 A CA000474068 A CA 000474068A CA 474068 A CA474068 A CA 474068A CA 1230733 A CA1230733 A CA 1230733A
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- mold
- stirring
- stirrer
- molten steel
- flow
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Abstract
ABSTRACT
For electromagnetically stirring a molten metal in a continuously casting mold, a plurality of linear motor type stirrer units each having a square shape (each side of which is smaller than the height dimension of the mold) are arranged in parallel along the long sides of the mold in such a manner that they are adapted to be changed in orientation by 90°, thereby changing the direction of a stirring flow of the molten steel in-to a given direction. As a result the surface defect is removed and the quality of the solidification structure is improved, and the application range of the kinds of the steels to be cast can be enlarged.
For electromagnetically stirring a molten metal in a continuously casting mold, a plurality of linear motor type stirrer units each having a square shape (each side of which is smaller than the height dimension of the mold) are arranged in parallel along the long sides of the mold in such a manner that they are adapted to be changed in orientation by 90°, thereby changing the direction of a stirring flow of the molten steel in-to a given direction. As a result the surface defect is removed and the quality of the solidification structure is improved, and the application range of the kinds of the steels to be cast can be enlarged.
Description
q~ '3;3 ~881-212 The present invention relates to a method of electro-magnetically stirring molten steel in a mold for continuous cast-ing. More particularly, the invention relates to a method for molten steel-continuous casting which readily realizes the optimum stirring pattern for the molten steel in the continuous casting mold so as to contribute significantly to the improvement of the quality of continuous cast slabs over various kinds of steels and for the respective kinds of the steels.
Electromagnetic stirring of the molten steel in the continuous casting mold (hereinafter referred to more briefly as "mold") is generally aimed at improving the surface defects of the surface portion of the continuously cast slab, particularly improvement in the quality of the solidification structure, and occasionally is aimed at enlargement of the kinds of steels to be cast (such as slightly deoxidized steel) and its application has recently been widely tried.
In the accompanying drawings:-Figures la and lb are a view of an electromagnetically stirring behavior which produces horizontally swirling flow and a plane skeleton view thereof;
Figure lc is a skeleton view o:E a plane o~ the mold illustrating th~ state o~ a parallel flow;
Figures 2a and 2b are a view illustrating a stirring behavior in a rimming flow and a skeleton view of the mold at the sectionally middle portion;
Figures 3a and 3b and Figures 4a and 4b are schematic views illustrating an example in which the stirring behavior is changed by divided stirrer units according to the present invention, and plane skeleton views of the mold;
Figures 5a and 5b are a sectional view transversing the long sides of the mold and a front view of the long side;
Figure 6 is a sectional view transversing long sides of a mold in another embodiment; and Figures 7-11 are schematic views illustrating various stirring patterns according to the present invention.
With respect to the direction in which the molten steel in the mold is electromagnetically stirred, the stirring is broad-ly classified into horizontal stirring and vertical stirring.
Horizontal stirring causes the molten steel in the mold to flow in a horizontal plane, and horizontal circulation flow as shown in solid lines in Figures la and lb or one way parallel flow as also shown by solid lines in Figure lc is produced in the bath surface of the molten steel in the mold.
On the other hand, vertical stirring causes flow of the molten steel in the mold along the height direction of the mold (that is, as shown by arrows in Figures 2a and 2b) as if the flow were similar to a rimming action in the ingot-making process of a rimmed steel (hereinafter referred to as ri~ming ~low) or occasion-ally in a direction opposite thereto.
The direction in which the molten steel Elows is general-ly shown by the arrow 1 in each of the Eigures, wherein reference numeral 2 is the mold, reference numeral 3 the molten steel in the 1'~3~ 3 mold, and reference numeral 4 a linear motor type stirrer. The direction of the electromagnetically stirring thrust is shown by white arrows 5, and reference numeral ~ is an immersion nozzle.
The directional selection of either horizontal stirring or vertical stirring is made depending upon the stirring purpose and power to be applied.
The ordinary profile of continuously cast pieces such as slabs is 200-300 mm in thickness and 1,000-2,500 mm in width.
The height of the continuous casting mold 2 is ordinarily 700-900 mm, and therefore the width of the mold 2 is as much as approxi-mately 2-3 times as large as the height thereof.
Therefore, from the standpoint of the stirring efficiency, the horizontal stirring of Figure 1 in which the distance for acceleration of the stirrer 4 can be made larger is more advan-tageous than the vertical stirring of Figure 2, and the stirring speed can be made larger in the former case. However, since stagnation is likely to be produced at both the ends in the width direction of the mold 2, that is, in the vicinity of the corners of the short sides, there is the likelihood that bubbles and non-metallic inclusions are accumulated near these corners.
In contrast , vertical stirring is inferior in terms of the stirring efficiency as mentioned above, but is more advantage-ous in that the rimming flow directly serves to float the bubbles and the inclusions. The concentrated stagnation is relatively hard to be formed, and it can be said that since the vicinity of the meniscus becomes the termination point of the acceleration, 3'733 vertical stirring is suitable for stirring mainly the vicinity of the meniscus.
From the foregoing, the general adoption standard for the stirring of the molten steel in the mold can be summarized as follows:
When the stirring flow speed is intended to be large and particularly the effect of cleaning off bubbles and inclusions at the solidification interface i.s intended, horizontal stirring, particularly in a swirling fashion, is well suited, while the vertical stirring is suitable for the purpose of improving the quality of the surface portion through stirring in the vicinity of the meniscus and controlling the flowing in the mold.
As mentioned above, either stirring direction has its own merits and demerits, and in application, it is necessary to select the stirring system best suited to the kind and the composi-tion of the steel and the casting conditions in each operation.
Therefore, since continuous casting apparatus to which the conventional electromagnetic stirring of the molten steel in the mold is applied is restricted to a single stirring system even where it treats various kinds of steels, the advantage of improving the quality can not be fully exhibited thereby.
Further, even through it is preferable that both the horizontal and vertical stirring systems are selectively used de-pending upon the kind of the steel and the casting conditions, as shown in Figures 1 and 2, conventional stirrers have a width that extends over substantially the whole wi.dth of the mold 2, so ~ 7~3 4881-212 that the dimensions of the stirrer in the width direction and the height direction differ greatly from each other and the installa-tion direction of the stirrer can not be changed. Further, even if the flow can be oppositely switched in the horizontal direc-tion or in the vertical direction by electrical operation, the directional change by 90 from the horizontal direction to the ver-tical direction or from the vertical direction to the horizontal direction can not be made. ThuS, the conventional stirring is fixed to either the horizontal direction or vertical direction.
The present invention aims to eliminate the above-mentioned drawbacks, and provide a method which enables the stir-ring both in the horizontal direction and in the vertical direction and by which an appropriate stirring flow can be select-ed to comply with various kinds of steels and casting conditions.
The invention provides a method of electromagnetically stirring a molten steel in a continuous casting mold for producing a slab by using a linear motor-type stirrer arranged along the sides of the continuously casting mold, said method comprising installing a plurality of rotatable stirring units of said linear motor-type stirrer in parallel along the long sides of the mold, each stirring unit having at least an approximately s~uare shape when viewed from the long si.de of the mold, ancl selecting the orientation of the electromagnetic stirring thrust between the horizontal and vertical directions or between the normal and reverse directions thereof, depending upon the kind of steel in-tended and casting conditions, by changing the installation 1;~;3~ D î 3~3 orientation or the current flow direction of the stirrer units.
The invention also provides an electromagnetic stirring type continuous casting apparatus for producing a slab, which comprises: a continuous casting mold, and a linear-type stirrer arranged along long sides of the continuous casting mold, wherein said stirrer comprises a plurality of rotatable stirrer units each having at least an approximately square shape as viewed from the long side of the mold and being installed in parallel along the long sides of the mold and adapted to selectively change the stir-ring direction of the molten steel in the mold, whereby the orienta-tion of the electromagnetic stirring thrust is selected between the horizontal and vertical directions thereof, or between the normal and reverse directions, depending upon the kind of steel intended and casting conditions, through changing the installation orientation or the current flowing direction of the stirrer units.
According to the invention, the stirring pattern of the molten metal in the mold can easily be optimized by the above-mentioned construction to match the kind of the steel and the cast-ing conditions, so that stable operation of the continuous casting apparatus and the enlargement of the use, such as the applicat.ion of the weak deoxidized steel to the continuous casting, can be advantageously realized in addition to the improvement oE the quality of the cast slab.
The invention will now be described in greater detail with reference to Figures 3 to 11 of the accompanying drawings.
In Figures 3 and ~ is shown an embodiment in which a J~'f 33 stirrer is divided into two units in the width dlrection of a mold such that the divided stirrer units may be attached to the mold in either vertical or lateral orientation, according to the present invention. Explanation will now be made as to how to selectively use horizontal circulating stirring and rimming flow stirring.
That is, in this embodiment, by setting the width b of each divided stirrer unit within the limit of the installation height h (see Figure 3a) in the height direction of the mold, it is possible for the direction of the electromagnetic stirring thrust of both stirrer units 4a and 4b~ (that is, white arrows 5) to be changed from the lateral direction in Figure 3a to the upwards direction shown in Figure 4a by changing the attachment orientation of the stirrer units by 90. The stirrer units both oriented in the upwards direction are shown by 4a' and 4b' in Figure 4a.
Specific examples of the mold 2 which are suitable for changing the direction of the electromagnetically stirring thrust as mentioned above are shown in Figures 5a and 5b and Figure 6.
In these figures, reference numeral 7 is a water-cooled copper plate, reference numeral 8 a mold frame, and reference numeral 9 a cooling box.
In general, the stirrer is requlred to be positioned with-in the cooling box of the mold frame and as near as possible to the water-cooled copper plate, so that: magnetic fluxes may pene-trate deeply into the molten steel in the mold, the leaked magnetic fluxes are reduced, and the electromagnetic force is prevented from '7~
weakening.
In this embodiment, the mold frame 8 equipped with a back-up plate for supporting the water-cooled copper plate 7 on the side of the long side of the mold (from the back surface there-of) has a housing depression 8' shown with respect to the stirrer unit 4a. In the embodiment of Figure 5, the depression is made square such that the width c and the height d thereof are slightly larger than the width b and the height _ of the divided stirrer units 4a and 4b (b~-h in the illustrated embodiment). A base plate 10 is placed on the bottom of the housing depression to appropri-ately adjust the installation position~ and a flange 11 of the stirrer unit 4a is fixed to the outer surface of the mold frame 8 by bolts. In the figure, reference numeral 12 is a power supply cable and reference numeral 13 is a terminal box for supplying the power.
In the embodiment illustrated in Figure 6, housing depression 8" is designed as a round hole having an inner diameter slightly larger than the diagonal of the divided stirrer unit 4a, and preferably a bearing 15 for supporting an axle 14 provided on the inner side of the divided stirrer unit 4a is formed on the middle recessed portion of the housing depression 8". A receiving seat 17 is provided at the lower portion o~ the housing depression 8" for guiding the sliding of a supporting jaw ring 16 provided adjacent to the flange 11 of the divided stirrer unit 4a, whereby the divided stirrer unit 4a is adapted to be changed in orientation after release of the securing bolts.
~ ;~31-~733 Although in the above described embodiments the divided stirrer units 4a and 4b are divided in two, it is obvious that the stirrer can be divided into more than two units arranged in parallel within the limit of the width of the mold.
Figures 7-11 show typical examples of various stirring patterns which can be achieved when the orientations of the divided stirrer units 4a and 4b are changed.
Figure 7 is an embodiment in which the stirring flow 1 is produced in a direction opposite to the flow 18 discharged from the immersion nozzle 6, and this embodiment can contribute to the reduction in contamination of inclusions at a deep position, which is likely to happen in a high speed casting.
In Figure 8, a stirring flow is produced along the dis-charged flow, thereby enhancing an effect of cleaning off bubbles and the inclusion from the solidification structure which may cause problems in casting at a relatively low speed.
Figure 9 is an embodiment in which stirring is done in an asymmetrically vertical fashion in the width direction of the mold to homogeneously perform mixing in the mold, Figure lO is an embodiment in which the reverse rimming flow is formed, and Figure ll is an embodiment in which the ascending and descending flows are produced along the forward and rearward :Long sides Oe the mold.
The selective switching of the electromagnetic stirring thrust in these stirring systems including the electrical opera-tion of the wire connection can be easily done.
By dividing the stirrer as mentioned above, the stirring 4~81-212 patterns of the molten steel can be increased to a large extent, and a stirring pattern corresponding to the kind of steel and the casting conditions over wider ranges can be selected.
Since stirring is switched between the horizontal direc-tion and the vertical direction by adjusting the installation orientation of the divided stirrer unit, the stirring flow advan-tageous for the kind of the steel and the casting conditions can be selected for the continuous casting apparatus in which various kinds of the steels are to be treated. Thus, the effect of im-proving the quality of the cast slab is large.
Electromagnetic stirring of the molten steel in the continuous casting mold (hereinafter referred to more briefly as "mold") is generally aimed at improving the surface defects of the surface portion of the continuously cast slab, particularly improvement in the quality of the solidification structure, and occasionally is aimed at enlargement of the kinds of steels to be cast (such as slightly deoxidized steel) and its application has recently been widely tried.
In the accompanying drawings:-Figures la and lb are a view of an electromagnetically stirring behavior which produces horizontally swirling flow and a plane skeleton view thereof;
Figure lc is a skeleton view o:E a plane o~ the mold illustrating th~ state o~ a parallel flow;
Figures 2a and 2b are a view illustrating a stirring behavior in a rimming flow and a skeleton view of the mold at the sectionally middle portion;
Figures 3a and 3b and Figures 4a and 4b are schematic views illustrating an example in which the stirring behavior is changed by divided stirrer units according to the present invention, and plane skeleton views of the mold;
Figures 5a and 5b are a sectional view transversing the long sides of the mold and a front view of the long side;
Figure 6 is a sectional view transversing long sides of a mold in another embodiment; and Figures 7-11 are schematic views illustrating various stirring patterns according to the present invention.
With respect to the direction in which the molten steel in the mold is electromagnetically stirred, the stirring is broad-ly classified into horizontal stirring and vertical stirring.
Horizontal stirring causes the molten steel in the mold to flow in a horizontal plane, and horizontal circulation flow as shown in solid lines in Figures la and lb or one way parallel flow as also shown by solid lines in Figure lc is produced in the bath surface of the molten steel in the mold.
On the other hand, vertical stirring causes flow of the molten steel in the mold along the height direction of the mold (that is, as shown by arrows in Figures 2a and 2b) as if the flow were similar to a rimming action in the ingot-making process of a rimmed steel (hereinafter referred to as ri~ming ~low) or occasion-ally in a direction opposite thereto.
The direction in which the molten steel Elows is general-ly shown by the arrow 1 in each of the Eigures, wherein reference numeral 2 is the mold, reference numeral 3 the molten steel in the 1'~3~ 3 mold, and reference numeral 4 a linear motor type stirrer. The direction of the electromagnetically stirring thrust is shown by white arrows 5, and reference numeral ~ is an immersion nozzle.
The directional selection of either horizontal stirring or vertical stirring is made depending upon the stirring purpose and power to be applied.
The ordinary profile of continuously cast pieces such as slabs is 200-300 mm in thickness and 1,000-2,500 mm in width.
The height of the continuous casting mold 2 is ordinarily 700-900 mm, and therefore the width of the mold 2 is as much as approxi-mately 2-3 times as large as the height thereof.
Therefore, from the standpoint of the stirring efficiency, the horizontal stirring of Figure 1 in which the distance for acceleration of the stirrer 4 can be made larger is more advan-tageous than the vertical stirring of Figure 2, and the stirring speed can be made larger in the former case. However, since stagnation is likely to be produced at both the ends in the width direction of the mold 2, that is, in the vicinity of the corners of the short sides, there is the likelihood that bubbles and non-metallic inclusions are accumulated near these corners.
In contrast , vertical stirring is inferior in terms of the stirring efficiency as mentioned above, but is more advantage-ous in that the rimming flow directly serves to float the bubbles and the inclusions. The concentrated stagnation is relatively hard to be formed, and it can be said that since the vicinity of the meniscus becomes the termination point of the acceleration, 3'733 vertical stirring is suitable for stirring mainly the vicinity of the meniscus.
From the foregoing, the general adoption standard for the stirring of the molten steel in the mold can be summarized as follows:
When the stirring flow speed is intended to be large and particularly the effect of cleaning off bubbles and inclusions at the solidification interface i.s intended, horizontal stirring, particularly in a swirling fashion, is well suited, while the vertical stirring is suitable for the purpose of improving the quality of the surface portion through stirring in the vicinity of the meniscus and controlling the flowing in the mold.
As mentioned above, either stirring direction has its own merits and demerits, and in application, it is necessary to select the stirring system best suited to the kind and the composi-tion of the steel and the casting conditions in each operation.
Therefore, since continuous casting apparatus to which the conventional electromagnetic stirring of the molten steel in the mold is applied is restricted to a single stirring system even where it treats various kinds of steels, the advantage of improving the quality can not be fully exhibited thereby.
Further, even through it is preferable that both the horizontal and vertical stirring systems are selectively used de-pending upon the kind of the steel and the casting conditions, as shown in Figures 1 and 2, conventional stirrers have a width that extends over substantially the whole wi.dth of the mold 2, so ~ 7~3 4881-212 that the dimensions of the stirrer in the width direction and the height direction differ greatly from each other and the installa-tion direction of the stirrer can not be changed. Further, even if the flow can be oppositely switched in the horizontal direc-tion or in the vertical direction by electrical operation, the directional change by 90 from the horizontal direction to the ver-tical direction or from the vertical direction to the horizontal direction can not be made. ThuS, the conventional stirring is fixed to either the horizontal direction or vertical direction.
The present invention aims to eliminate the above-mentioned drawbacks, and provide a method which enables the stir-ring both in the horizontal direction and in the vertical direction and by which an appropriate stirring flow can be select-ed to comply with various kinds of steels and casting conditions.
The invention provides a method of electromagnetically stirring a molten steel in a continuous casting mold for producing a slab by using a linear motor-type stirrer arranged along the sides of the continuously casting mold, said method comprising installing a plurality of rotatable stirring units of said linear motor-type stirrer in parallel along the long sides of the mold, each stirring unit having at least an approximately s~uare shape when viewed from the long si.de of the mold, ancl selecting the orientation of the electromagnetic stirring thrust between the horizontal and vertical directions or between the normal and reverse directions thereof, depending upon the kind of steel in-tended and casting conditions, by changing the installation 1;~;3~ D î 3~3 orientation or the current flow direction of the stirrer units.
The invention also provides an electromagnetic stirring type continuous casting apparatus for producing a slab, which comprises: a continuous casting mold, and a linear-type stirrer arranged along long sides of the continuous casting mold, wherein said stirrer comprises a plurality of rotatable stirrer units each having at least an approximately square shape as viewed from the long side of the mold and being installed in parallel along the long sides of the mold and adapted to selectively change the stir-ring direction of the molten steel in the mold, whereby the orienta-tion of the electromagnetic stirring thrust is selected between the horizontal and vertical directions thereof, or between the normal and reverse directions, depending upon the kind of steel intended and casting conditions, through changing the installation orientation or the current flowing direction of the stirrer units.
According to the invention, the stirring pattern of the molten metal in the mold can easily be optimized by the above-mentioned construction to match the kind of the steel and the cast-ing conditions, so that stable operation of the continuous casting apparatus and the enlargement of the use, such as the applicat.ion of the weak deoxidized steel to the continuous casting, can be advantageously realized in addition to the improvement oE the quality of the cast slab.
The invention will now be described in greater detail with reference to Figures 3 to 11 of the accompanying drawings.
In Figures 3 and ~ is shown an embodiment in which a J~'f 33 stirrer is divided into two units in the width dlrection of a mold such that the divided stirrer units may be attached to the mold in either vertical or lateral orientation, according to the present invention. Explanation will now be made as to how to selectively use horizontal circulating stirring and rimming flow stirring.
That is, in this embodiment, by setting the width b of each divided stirrer unit within the limit of the installation height h (see Figure 3a) in the height direction of the mold, it is possible for the direction of the electromagnetic stirring thrust of both stirrer units 4a and 4b~ (that is, white arrows 5) to be changed from the lateral direction in Figure 3a to the upwards direction shown in Figure 4a by changing the attachment orientation of the stirrer units by 90. The stirrer units both oriented in the upwards direction are shown by 4a' and 4b' in Figure 4a.
Specific examples of the mold 2 which are suitable for changing the direction of the electromagnetically stirring thrust as mentioned above are shown in Figures 5a and 5b and Figure 6.
In these figures, reference numeral 7 is a water-cooled copper plate, reference numeral 8 a mold frame, and reference numeral 9 a cooling box.
In general, the stirrer is requlred to be positioned with-in the cooling box of the mold frame and as near as possible to the water-cooled copper plate, so that: magnetic fluxes may pene-trate deeply into the molten steel in the mold, the leaked magnetic fluxes are reduced, and the electromagnetic force is prevented from '7~
weakening.
In this embodiment, the mold frame 8 equipped with a back-up plate for supporting the water-cooled copper plate 7 on the side of the long side of the mold (from the back surface there-of) has a housing depression 8' shown with respect to the stirrer unit 4a. In the embodiment of Figure 5, the depression is made square such that the width c and the height d thereof are slightly larger than the width b and the height _ of the divided stirrer units 4a and 4b (b~-h in the illustrated embodiment). A base plate 10 is placed on the bottom of the housing depression to appropri-ately adjust the installation position~ and a flange 11 of the stirrer unit 4a is fixed to the outer surface of the mold frame 8 by bolts. In the figure, reference numeral 12 is a power supply cable and reference numeral 13 is a terminal box for supplying the power.
In the embodiment illustrated in Figure 6, housing depression 8" is designed as a round hole having an inner diameter slightly larger than the diagonal of the divided stirrer unit 4a, and preferably a bearing 15 for supporting an axle 14 provided on the inner side of the divided stirrer unit 4a is formed on the middle recessed portion of the housing depression 8". A receiving seat 17 is provided at the lower portion o~ the housing depression 8" for guiding the sliding of a supporting jaw ring 16 provided adjacent to the flange 11 of the divided stirrer unit 4a, whereby the divided stirrer unit 4a is adapted to be changed in orientation after release of the securing bolts.
~ ;~31-~733 Although in the above described embodiments the divided stirrer units 4a and 4b are divided in two, it is obvious that the stirrer can be divided into more than two units arranged in parallel within the limit of the width of the mold.
Figures 7-11 show typical examples of various stirring patterns which can be achieved when the orientations of the divided stirrer units 4a and 4b are changed.
Figure 7 is an embodiment in which the stirring flow 1 is produced in a direction opposite to the flow 18 discharged from the immersion nozzle 6, and this embodiment can contribute to the reduction in contamination of inclusions at a deep position, which is likely to happen in a high speed casting.
In Figure 8, a stirring flow is produced along the dis-charged flow, thereby enhancing an effect of cleaning off bubbles and the inclusion from the solidification structure which may cause problems in casting at a relatively low speed.
Figure 9 is an embodiment in which stirring is done in an asymmetrically vertical fashion in the width direction of the mold to homogeneously perform mixing in the mold, Figure lO is an embodiment in which the reverse rimming flow is formed, and Figure ll is an embodiment in which the ascending and descending flows are produced along the forward and rearward :Long sides Oe the mold.
The selective switching of the electromagnetic stirring thrust in these stirring systems including the electrical opera-tion of the wire connection can be easily done.
By dividing the stirrer as mentioned above, the stirring 4~81-212 patterns of the molten steel can be increased to a large extent, and a stirring pattern corresponding to the kind of steel and the casting conditions over wider ranges can be selected.
Since stirring is switched between the horizontal direc-tion and the vertical direction by adjusting the installation orientation of the divided stirrer unit, the stirring flow advan-tageous for the kind of the steel and the casting conditions can be selected for the continuous casting apparatus in which various kinds of the steels are to be treated. Thus, the effect of im-proving the quality of the cast slab is large.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of electromagnetically stirring a molten steel in a continuous casting mold for producing a slab by using a linear motor-type stirrer arranged along the sides of the continu-ously casting mold, said method comprising installing a plurality of rotatable stirring units of said linear motor-type stirrer in parallel along the long sides of the mold, each stirring unit having at least an approximately square shape when viewed from the long side of the mold, and selecting the orientation of the electro-magnetic stirring thrust between the horizontal and vertical direc-tions or between the normal and reverse directions thereof, depending upon the kind of steel intended and casting conditions, by changing the installation orientation or the current flow direction of the stirrer units.
2. A method according to claim 1, wherein the stirring thrust applied to the molten steel in the horizontal direction or in the vertical direction is reversed by making electrical adjust-ment.
3. A method according to claim 1, wherein the attaching orientation of the stirrer unit is changed by 90° to change the stirring thrust orientation in the molten steel flow in the hori-zontal or vertical direction by 90°, whereby the flow is switched between vertical flow and horizontal flow.
4. An electromagnetic stirring type continuous casting apparatus for producing a slab, which comprises: a continuous casting mold, and a linear-type stirrer arranged along long sides of the continuous casting mold, wherein said stirrer comprises a plurality of rotatable stirrer units each having at least an approximately square shape as viewed from the long side of the mold and being installed in parallel along the long sides of the mold and adapted to selectively change the stirring direction of the molten steel in the mold, whereby the orientation of the electromagnetic stirring thrust is selected between the horizontal and vertical directions thereof, or between the normal and reverse directions, depending upon the kind of steel intended and casting conditions, through changing the installation orientation or the current flowing direction of the stirrer units.
5. An electromagnetically stirring type continuous casting apparatus as claimed in claim 4, comprising means for changing the flow of molten steel in the horizontal direction or in the ver-tical direction to an opposite direction in response to electro-magnetic force.
6. An electromagnetically stirring type continuously casting apparatus as claimed in claim 4, comprising means for changing by 90° the attaching orientation of the stirrer units, so as to change a molten steel flow in the horizontal or vertical direction by 90°.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000474068A CA1230733A (en) | 1985-02-12 | 1985-02-12 | Method of electromagnetically stirring a molten steel in a mold for a continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000474068A CA1230733A (en) | 1985-02-12 | 1985-02-12 | Method of electromagnetically stirring a molten steel in a mold for a continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230733A true CA1230733A (en) | 1987-12-29 |
Family
ID=4129816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000474068A Expired CA1230733A (en) | 1985-02-12 | 1985-02-12 | Method of electromagnetically stirring a molten steel in a mold for a continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1230733A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113544099A (en) * | 2019-03-05 | 2021-10-22 | Abb瑞士股份有限公司 | Continuous glass melting tank with immersed stirring body |
-
1985
- 1985-02-12 CA CA000474068A patent/CA1230733A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113544099A (en) * | 2019-03-05 | 2021-10-22 | Abb瑞士股份有限公司 | Continuous glass melting tank with immersed stirring body |
| US11542188B2 (en) | 2019-03-05 | 2023-01-03 | Abb Schweiz Ag | Continuous glass melting tank with an immersed stirring body |
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