US2025205777A1PendingUtilityA1
Immersion nozzle, mold, and continuous casting method of steel
Est. expiryApr 1, 2042(~15.7 yrs left)· nominal 20-yr term from priority
Inventors:Shugo MoritaTakumi KawarazakiTomohiro TanakaNorichika AramakiAkitoshi MatsuiTetsuro KoyanoRyosuke ChiyoharaKeisuke Sano
B22D 11/115B22D 11/04B22D 41/50B22D 41/58B22D 11/10B22D 11/0642
54
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Claims
Abstract
An immersion nozzle that supplies molten steel from a storage vessel for steel to a mold of a continuous casting machine in continuous casting of steel, in which an end of a main body of the nozzle to be immersed into the molten steel in the mold is closed, a pair of discharge ports having a central axis as a symmetry axis is provided in each of an upper and lower position of the main body of the nozzle to be immersed in the molten steel, and an area of an opening part of the lower discharge port is within 1.0 to 1.6 times, inclusive, of an area of an opening part of the upper discharge port.
Claims
exact text as granted — not AI-modified1 . An immersion nozzle for supplying molten steel from a storage container of the molten steel to a mold in a continuous casting machine for continuous casting of steel,
characterized in that an end of a main body of the immersion nozzle to be immersed into the molten steel in the mold is closed, a pair of discharge ports having a central axis as a symmetry axis is provided in each of an upper and lower position of the main body of the nozzle to be immersed in the molten steel, and an area of an opening portion of the lower discharge port is within 1.0 to 1.6 times, inclusive, of an area of an opening portion of the upper discharge port.
2 . The immersion nozzle according to claim 1 , wherein
a ratio r/R of an inner diameter r to another inner diameter R is 0.6 or more but less than 1.0, wherein r represents the inner diameter of the immersion nozzle from an upper end of the upper discharge port to an bottom end of the immersion nozzle, while R represents the inner diameter of the immersion nozzle up to the upper end of the upper discharge port within a flow path in the immersion nozzle.
3 . The immersion nozzle according to claim 1 , wherein
discharge directions of the upper discharge port and the lower discharge port are arranged at an angle θ within 10° in a top plan view.
4 . A mold for a continuous casting machine having the immersion nozzle according to claim 1 , wherein
the mold is configured to have an index K which is represented by the following equation (1) and affects a variation of a molten surface is within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper discharge port of the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
5 . The mold according to claim 4 , comprising an electromagnetic stirring apparatus having a direct current coil and an alternating current coil capable of applying a superposed magnetic field of direct current magnetic field and alternating magnetic field to the molten steel in the mold, outside a long side of the mold positioned above the discharge ports of the immersion nozzle, and an electromagnetic braking apparatus having a direct current coil capable of applying a direct current magnetic field to the molten steel in the mold, outside a long side of the mold positioned below the discharge ports of the immersion nozzle.
6 . A continuous casting method using the immersion nozzle according to claim 1 , wherein
an index K of molten surface variation represented by the following equation (1) is adjusted to be within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper end of the discharge port in the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
7 . The continuous casting method of steel according to claim 6 , comprising
applying a magnetic field obtaining by superposing an alternating magnetic field having a magnetic flux density of 0.03 to 0.1 T on a direct current magnetic field having a magnetic flux density of 0.1 to 0.8 T to the molten steel in the mold positioned above the discharge ports of the immersion nozzle immersed in the molten steel in the mold and applying a direct current magnetic field having a magnetic flux density of 0.1 to 0.8 T to the molten steel in the mold positioned below the discharge ports.
8 . The continuous casting method of steel according to claim 6 , comprising flowing an Ar gas from a tundish upper nozzle while controlling a ratio Q Ar /TP of an Ar gas flow rate Q Ar [NL/min] to a molten steel passing mass TP [t/min] within 2.0 to 5.0 inclusive.
9 . The immersion nozzle according to claim 2 , wherein
discharge directions of the upper discharge port and the lower discharge port are arranged at an angle θ within 10° in a top plan view.
10 . A mold for a continuous casting machine having the immersion nozzle according to claim 2 , wherein
the mold is configured to have an index K which is represented by the following equation (1) and affects a variation of a molten surface is within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper discharge port of the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
11 . A mold for a continuous casting machine having the immersion nozzle according to claim 3 , wherein
the mold is configured to have an index K which is represented by the following equation (1) and affects a variation of a molten surface is within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper discharge port of the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
12 . A mold for a continuous casting machine having the immersion nozzle according to claim 9 , wherein
the mold is configured to have an index K which is represented by the following equation (1) and affects a variation of a molten surface is within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper discharge port of the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
13 . A continuous casting method using the immersion nozzle according to claim 2 , wherein
an index K of molten surface variation represented by the following equation (1) is adjusted to be within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper end of the discharge port in the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
14 . A continuous casting method using the immersion nozzle according to claim 3 , wherein
an index K of molten surface variation represented by the following equation (1) is adjusted to be within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper end of the discharge port in the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].
15 . A continuous casting method using the immersion nozzle according to claim 9 , wherein
an index K of molten surface variation represented by the following equation (1) is adjusted to be within a range of 0.09 to 0.14:
K
2
=
(
L
2
+
W
2
/
4
)
/
TP
2
,
(
1
)
wherein L is a distance [m] from a meniscus to the upper end of the upper end of the discharge port in the immersion nozzle, W is a distance [m] between short sides of the mold at the position of the meniscus, and TP is a molten steel passing mass [t/min].Join the waitlist — get patent alerts
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