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1. WO2020002313 - METHOD FOR CONTAINING A SLAB DURING CONTINUOUS CASTING

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS

1. Method for containing a slab during continuous casting, which provides to cast a slab (S) along a casting axis (C), said slab (S) having a predefined width (Wl), wherein the method provides a containment of the slab (S) with a plurality of rolls (1 1, 12), said rolls (11, 12) being disposed in pairs facing to each other, and defining a passage along the casting axis (C) for the cast slab (S), wherein the plurality of rolls (11, 12) comprises electromagnetic rolls (12) provided with an electromagnetic stirrer (13) which stirs the liquid contained in the slab (S), characterized in that, during casting, the electromagnetic rolls (12) have a length (L) less than the width (Wl) of the slab (S) so that the slab (S) protrudes with respect to at least one end of said electromagnetic rolls (12), with at least one protruding portion (20).

2. Method for containing a slab during continuous casting as in claim 1, characterized in that the slab (S) is protruding, with respect to one end of the electromagnetic roll (12), by an unsupported width (W2) up to 300mm, preferably up to 250mm, and said protruding portion (20) is not supported by rolls.

3. Method for containing a slab during continuous casting as in claim 2, characterized in that the ratio between the unsupported width (W2) of the slab (S) and the width (Wl) of the slab (S) is comprised between 2% and 20%, preferably between 2.5% and 16%.

4. Method for containing a slab during a continuous casting as in claim 1, characterized in that each of the electromagnetic rolls (12) is associated with a respective auxiliary containing roll (14), aligned to and in axis with the respective electromagnetic roll (12), said auxiliary containing roll (14) supporting said protruding portion (20).

5. Method for containing a slab as in any claim hereinbefore, characterized in that said rolls comprises a first electromagnetic roll (12) and a second electromagnetic roll (12) distanced to each other along the casting axis (C).

6. Method for containing a slab as in claim 5, characterized in that between the first electromagnetic roll (12) and the second electromagnetic roll (12), a plurality of containing rolls (11) is provided in order to contain and support the slab (S).

7. Method for containing a slab as in claim 5 or 6, characterized in that the first electromagnetic roll (12) is disposed so that a first edge (21) of the slab (S) protrudes with respect to the first electromagnetic roll (12), while a second edge (22), opposite with respect to the first edge (21), protrudes with respect to the second electromagnetic roll ( 12).

8. Casting equipment comprising a mold (15) configured to cast a slab (S), and a plurality of rolls (11, 12) disposed in pairs facing to each other, and along the casting axis (C) in order to define a passage for the cast slab (S), wherein the plurality of rolls (11, 12) comprises electromagnetic rolls (12) provided with an electromagnetic stirrer (13) configured to stir the liquid contained in the slab (S), wherein the electromagnetic rolls (12) and therefore said passage have a length (L) less than the width (Wl) of the slab (S) so that the slab (S) protrudes with respect to one end of said electromagnetic rolls (12).

9. Casting equipment as in claim 8, characterized in that each of the electromagnetic rolls (12) is associated with a respective auxiliary containing roll

(14), aligned to and in axis with the respective electromagnetic roll (12).

10. Casting equipment as in claim 8 or 9, characterized in that said rolls comprises a first electromagnetic roll (12) and a second electromagnetic roll (12) distanced to each other along the casting axis (C).

11. Casting equipment as in claim 9 and 10, characterized in that the auxiliary containing roll (14) associated with the first electromagnetic roll (12) is located on a first side with respect to the casting axis (C), and in that the auxiliary containing roll (14) associated with the second electromagnetic roll (12) is located on a second side, opposite the first side, with respect to the casting axis (C).

12. Casting equipment as in claim 10 or 11, characterized in that between the first electromagnetic roll (12) and the second electromagnetic roll (12), a plurality of containing rolls (11) are provided in order to contain and support the slab (S).