# US 11,897,027 B2 · Immersion nozzle for continuous casting

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- Number: US 11,897,027 B2
- Document ID: US11897027B2
- Status: Granted
- Kind: B2
- Application number: 18/039,825
- Filed: 2022-03-03
- Published: 2023-11-02
- Granted: 2024-02-13
- Earliest claimed: 2021-04-15
- Assignees: Shinagawa Refractories Co., Ltd.
- Applicants: Shinagawa Refractories Co., Ltd
- Inventors: Hiroyasu Niitsuma; Keigo Fujita
- Web page: https://patentgrep.com/patent/US11897027B2

## CPC

- B22D 11/10: Supplying or treating molten metal (B22D41/00 takes precedence)
- B22D 41/50: Pouring-nozzles
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

The cross-sectional shape of a flow passage 31 is circular in a first portion 3; the shape of a flow passage 51 is a flat shape in a second portion 5; in a connecting portion 4, the shape of a flow passage 41 is a shape continuously connecting the flow passage 31 of the first portion 3 and the flow passage 51 of the second portion 5; an opening 52 is provided on the distal end side of the second portion 5 and extends along a plane direction of the flat shape; and assuming that a maximum value of a cross-sectional area of the flow passage 31 in the first portion 3 is given by S1, that a maximum value of a cross-sectional area of the flow passage 51 in the second portion 5 is given by S2, and that a minimum value of a cross-sectional area of the flow passage 31 within a range of 20% of a length L1 of the first portion 3 from a boundary portion 42 between the first portion 3 and the connecting portion 4 toward the upstream side is given by S3, S2 is greater than S1, the ratio S1/S3 between S1 and S3 is 1.10 or more and 2.00 or less, and the ratio S2/S3 between S2 and S3 is 1.20 or more and 2.50 or less.

## Claims

### Claim 1

An immersion nozzle for continuous casting, comprising:
a flow passage;
an opening;
a first portion;
a connecting portion; and
a second portion,
the first portion, the connecting portion, and the second portion being arranged in this order from a proximal end side of the immersion nozzle, wherein
a cross-sectional shape of the flow passage is circular in the first portion,
a cross-sectional shape of the flow passage in the second portion is a shape having a length in a long-side direction 1.5 times or more a length in a short-side direction;
in the connecting portion, a shape of the flow passage is a shape continuously connecting the flow passage of the first portion and the flow passage of the second portion,
the opening is in a portion of the second portion proximate to a distal end, and
a maximum value of a cross-sectional area of the flow passage in the first portion is S1, a maximum value of a cross-sectional area of the flow passage in the second portion is S2, and a minimum value of a cross-sectional area of the flow passage within a range of 20% of a length of the first portion from a boundary portion between the first portion and the connecting portion toward an upstream side is S3,
S2 is greater than S1,
a ratio S1/S3 between S1 and S3 is 1.10 or more and 2.00 or less,
a ratio S2/S3 between S2 and S3 is 1.20 or more and 2.50 or less,
a ratio of a length of the second portion to the total length is 8% or more and 50% or less, and
a ratio of a length of the connecting portion to the total length is 8% or more and 50% or less.

### Claim 2 (depends on 1)

The immersion nozzle for continuous casting according to claim 1, wherein
a width of the flow passage in the second portion is 300 mm or less.

### Claim 3 (depends on 1)

The immersion nozzle according to claim 1, further comprising:
a joining portion connected to a portion of the first portion on the proximal end side, wherein
a cross-sectional area of the flow passage gradually decreases from a proximal end side to a distal end side of the joining portion.

### Claim 4 (depends on 1)

The immersion nozzle according to claim 1, wherein the opening is provided in each of two longitudinal-direction side surfaces in a distal end portion of the second portion.

### Claim 5 (depends on 1)

The immersion nozzle according to claim 1, wherein the opening is provided in a surface at a distal end of the second portion.

### Claim 6 (depends on 1)

The immersion nozzle according to claim 1, wherein a ratio of a length of the first portion to a total length is 8% or more and 42% or less.