Flow-controllable tundish structure capable of filtering inclusions in molten steel

Patent metadata

Field	Value
Publication number	US-11273488-B2
Application number	US-201917042313-A
Country	US
Kind code	B2
Filing date	Feb 28, 2019
Priority date	Mar 30, 2018
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

Disclosed is a flow-controllable tundish structure capable of filtering inclusions in molten steel. The tundish structure comprises a tundish ( 1 ), the tundish being divided into three separated cavities which comprise an impact zone cavity ( 1 a ) in the middle and pouring zone cavities ( 1 b ) at two sides thereof. A long nozzle ( 2 ) for pouring is vertically arranged in the center of the impact zone cavity, and molten steel flows down out of the long nozzle for pouring and is injected into the impact zone cavity; and a turbulence suppressor ( 3 ) directly facing the long nozzle for pouring is arranged on the cavity bottom under the long nozzle for pouring, and the molten steel flowing down out of the long nozzle for pouring impacts on the turbulence suppressor and is then buffered and mixed. Filter assemblies (A) are respectively arranged between the impact zone cavity and the pouring zone cavities at the two sides, and the buffered and mixed molten steel in the impact zone cavity is filtered by the filter assemblies and is then delivered into the pouring zone cavities at the two sides. Discharge ports ( 4 ) are respectively arranged in the bottom of the pouring zone cavities, and the molten steel filtered by the filter assemblies flows into the pouring zone cavities and then flows out from the discharge ports. The flow-controllable tundish structure has the advantages of a simple structure, easy building and lower cost, and has a good liquid steel purification effect.

First claim

The invention claimed is:

1. A flow-controllable tundish structure, comprising a tundish ( 1 ), wherein
the tundish ( 1 ) comprises an impact zone cavity ( 1 a ) in the middle and pouring zone cavities ( 1 b ) at two sides;
a long nozzle ( 2 ) for pouring is perpendicularly arranged in the center of the impact zone cavity ( 1 a ), and a turbulence suppressor ( 3 ) directly facing the long nozzle ( 2 ) for pouring is arranged at the bottom of the cavity under the long nozzle ( 2 ) for pouring;
filter assemblies (A) are respectively arranged between the impact zone cavity ( 1 a ) and the pouring zone cavities ( 1 b ) at the two sides, and the buffered and mixed molten steel in the impact zone cavity ( 1 a ) is filtered by the filter assemblies (A) and is then delivered into the pouring zone cavities ( 1 b ) at the two sides;
discharge ports ( 4 ) are respectively arranged at the bottoms of the pouring zone cavities ( 1 b ), and the molten steel filtered by the filter assemblies (A) flows into the pouring zone cavities ( 1 b ) and then flows out from the discharge ports ( 4 ); and
the filter assembly (A) comprises a slag retaining filter wall (A 1 ) separating the impact zone cavity ( 1 a ) and the pouring zone cavity ( 1 b ), the slag retaining filter wall (A 1 ) comprises a retaining wall diversion slot (A 2 ) inclining from the side of the pouring zone cavity ( 1 b ) to the side of the impact zone cavity ( 1 a ), and the retaining wall diversion slot (A 2 ) penetrates through the slag retaining filter wall (A 1 ) in a curved form.

2. The flow-controllable tundish structure according to claim 1 , wherein the retaining wall diversion slot (A 2 ) comprises an inlet section ( 21 ), an intermediate section ( 22 ) and an outlet section ( 23 ), wherein the inlet section ( 21 ) and the outlet section ( 23 ) are coaxial holes, and the axis of the intermediate section ( 22 ) is not collinear with the inlet section ( 21 ) and the outlet section ( 23 ).

3. The flow-controllable tundish structure according to claim 1 , wherein a plurality of the retaining wall diversion slots (A 2 ) are arranged in parallel at a lower portion of the slag retaining filter wall (A 1 ).

4. The flow-controllable tundish structure according to claim 3 , wherein the slag retaining filter wall (A 1 ) comprises an upper portion ( 12 ) and a lower portion ( 11 ), the thickness of the lower portion ( 11 ) being 2-2.5 times greater than the thickness of the upper portion ( 12 ).

5. The flow-controllable tundish structure according to claim 1 , wherein the filter assembly (A) further comprises a retaining dam (A 4 ), the retaining dam (A 4 ) is perpendicularly arranged at the bottom, close to the retaining wall diversion slot (A 2 ), of the pouring zone cavity ( 1 b ), the shape and the size of the retaining dam (A 4 ) correspond to a cross section of a lower portion of the pouring zone cavity ( 1 b ), and a retaining dam diversion hole (A 5 ) penetrating through the retaining dam is arranged in the middle of the bottom of the retaining dam (A 4 ).

6. The flow-controllable tundish structure according to claim 5 , wherein the slag retaining filter wall (A 1 ) further comprises a retaining wall diversion hole (A 3 ), and the retaining wall diversion hole (A 3 ) is arranged at the bottom of the slag retaining filter wall (A 1 ) in a way of penetrating through the slag retaining filter wall (A 1 ); and molten steel flows into the pouring zone cavity ( 1 b ) from the impact zone cavity ( 1 a ) through the retaining wall diversion slot (A 2 ) and the retaining wall diversion hole (A 3 ), most of the molten steel flows over the retaining dam (A 4 ) when passing through the retaining dam (A 4 ), a small part of the molten steel flows through the retaining dam diversion hole (A 5 ) in the middle of the bottom of the retaining dam (A 4 ), and finally all the molten steel flows out from the discharge port ( 4 ).

7. The flow-controllable tundish structure according to claim 1 , wherein an impact zone accounts for 30% or above of the effective volume of the whole tundish.

Assignees

• Baoshan Iron & Steel

Inventors

• Liu Xufeng
• Fan Zhengjie
• Zhi Jianjun
• Zheng Hongguang

Classifications

• B22D11/119

  by filtering · CPC title

• B22D43/004 Primary

  by using filtering means (B22C9/086 takes precedence) · CPC title

• B22D41/08 Primary

  for bottom pouring (B22D41/14, B22D41/50 take precedence) · CPC title

• B22D43/00

  Mechanical cleaning, e.g. skimming of molten metals · CPC title