# US 9,873,150 B2 · Method and device for continuous thin strip casting

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- Number: US 9,873,150 B2
- Document ID: US9873150B2
- Status: Granted
- Kind: B2
- Application number: 14/429,743
- Filed: 2012-09-27
- Published: 2015-09-10
- Granted: 2018-01-23
- Earliest claimed: 2012-09-25
- Assignees: Baoshan Iron & Steel Co., Ltd.
- Applicants: Baoshan Iron & Steel Co., Ltd.
- Inventors: Sanbing Ren; Yuan Fang; Junfei Fan; Yan Yu
- Web page: https://patentgrep.com/patent/US9873150B2

## CPC

- B22D 11/10: Supplying or treating molten metal (B22D41/00 takes precedence)
- B22D 11/001: {of specific alloys}
- B22D 11/0622: {formed by two casting wheels}
- B22D 11/118: by circulating the metal under, over or around weirs (B22D11/119 takes precedence)
- B22D 41/01: Heating means
- B22D 41/015: with external heating, i.e. the heat source not being a part of the ladle
- B22D 41/60: with heating or cooling means
- 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

A method for continuous thin strip casting comprises: introducing molten steel through a long nozzle into a tundish from a ladle, the tundish is one strand tundish, and the molten steel flows below a weir, then passes a first dam and enters a channel with an induction heating device, and the heated molten steel then flows out from an outlet at the other side of the tundish to a nozzle also with an induction heating device for casting. The distances between the weirs of the tundish and the channel have optimal distance ranges. The present invention can improve the casting stability and the quality of the casting strip.

## Claims

### Claim 1

A method for continuous thin strip casting comprising:
providing molten steel by pouring the molten steel from a ladle through a long nozzle into a tundish; and
heating the molten steel by heating a channel inside the tundish through which the molten steel flows to maintain the molten steel at an approximately constant temperature during the pouring, wherein a first induction heater is disposed outside of a nozzle disposed at a first side of the tundish, wherein further,
the molten steel flows below a weir located at the first side of the tundish;
the molten steel passes a first dam and enters the channel, the channel having a second induction heater for induction heating of the molten steel, wherein further, a temperature of the molten steel after induction heating is 30˜50° C. higher than that of the molten steel provided into the tundish; and
the induction heated molten steel flows out from an outlet at a second side opposite the first side of the tundish to the nozzle for casting the induction heated molten steel.

### Claim 2 (depends on 1)

The method for continuous thin strip casting according to claim 1, wherein a distance between the first induction heater disposed outside of the nozzle and an upper port of the nozzle is approximately ½ to approximately ⅔ of the distance between an inlet and an outlet of the tundish.

### Claim 3 (depends on 1)

The method for continuous thin strip casting according to claim 1, wherein the molten steel after induction heating passes a second dam and the molten steel flows out from the outlet at the second side of the tundish for casting.

### Claim 4

A tundish for continuous thin strip casting, wherein the tundish comprises a tundish inlet, a weir, a first dam, a retaining wall separating the tundish into two chambers, a tundish outlet, and a nozzle disposed proximate to the tundish outlet;
wherein the retaining wall is provided inside the tundish with a channel which impenetrates two chambers;
wherein the channel is surrounded by a first induction heater, the first induction heater comprising an iron core, a coil, a refractory material and a tube; and
wherein a second induction heater is disposed outside of the nozzle;
wherein the tundish is further configured such that,
molten steel flows below the weir located at a first side of the tundish;
the molten steel passes the first dam and enters the channel, where the first induction heater induction heats the molten steel, wherein further, a temperature of the molten steel after the induction heating by the first induction heater is 30˜50° C. higher than that of the molten steel provided into the tundish; and
the induction heated molten steel flows out from the tundish outlet at a second side opposite the first side of the tundish to the nozzle for casting the induction heated molten steel.

### Claim 5 (depends on 4)

The tundish for continuous thin strip casting according to claim 4, wherein the tundish further comprises a second dam.

### Claim 6 (depends on 4)

The tundish used for continuous thin strip casting according to claim 4, wherein a distance between the tundish inlet and the retaining wall is approximately ½ to approximately ⅔ of a distance between the tundish inlet and the tundish outlet.

### Claim 7 (depends on 4)

The tundish for continuous thin strip casting according to claim 4, wherein a distance between the retaining wall and the tundish outlet is approximately ¼ to approximately ⅔ of a distance between the tundish inlet and the tundish outlet.

### Claim 8 (depends on 4)

The tundish for continuous thin strip casting according to claim 4, wherein a distance between the weir and the retaining wall is approximately ⅓ to approximately ⅔ of a distance between the tundish inlet and the retaining wall.

### Claim 9 (depends on 4)

The tundish for continuous thin strip casting according to claim 4, wherein a distance between the first dam and the retaining wall is approximately ¼ to approximately ½ of a distance between the tundish inlet and the retaining wall.