Exchangeable nozzle for a nozzle changer system, a method for manufacturing such a nozzle, a nozzle changer system comprising such a nozzle and a tundish comprising such a nozzle changer system

Patent metadata

Field	Value
Publication number	US-12138682-B2
Application number	US-202017772611-A
Country	US
Kind code	B2
Filing date	Sep 3, 2020
Priority date	Nov 26, 2019
Publication date	Nov 12, 2024
Grant date	Nov 12, 2024

Abstract

The invention concerns an exchangeable nozzle for a nozzle changer system for billet casting, a method for manufacturing such a nozzle, a nozzle changer system comprising such a nozzle and a tundish comprising such a nozzle changer system.

First claim

The invention claimed is:

1. An exchangeable nozzle ( 200 ) for a nozzle changer system ( 11 ) for billet casting, said exchangeable nozzle ( 200 ) comprising:
1.1 a tubular member ( 201 );
1.1.1 said tubular member ( 201 ) extending along a longitudinal axis (L) from a first end ( 209 ) of said tubular member ( 201 ) to a second end ( 211 ) of said tubular member ( 201 ); said tubular member ( 201 ) comprising:
1.1.2 an inner passageway ( 213 ) extending through said tubular member ( 201 ) along said longitudinal axis (L) from said first end ( 209 ) of said tubular member ( 201 ) to said second end ( 211 ) of said tubular member ( 201 );
1.1.3 an inlet ( 215 ) opening into said inner passageway ( 213 ) at said first end ( 209 ) of said tubular member ( 201 ); and
1.1.4 an outlet ( 217 ) opening into said inner passageway ( 213 ) at said second end ( 211 ) of said tubular member ( 201 );

1.2 said tubular member ( 201 ) comprising partially stabilized sintered zirconia;
1.2.1 said partially stabilized sintered zirconia being partially stabilized by MgO; and
1.2.2 said partially stabilized sintered zirconia having a degree of stabilization not above 20% by mass; and

1.3 said tubular member ( 201 ) comprising free carbon.

2. The exchangeable nozzle ( 200 ) according to claim 1 , said partially stabilized sintered zirconia having a degree of stabilization in the range from 2 to 20% by mass.

3. The exchangeable nozzle ( 200 ) according to claim 1 , wherein the difference of linear thermal expansion of said tubular member ( 201 ) at 1,100° C. and 1,200° C. is below 0,1 percentage points.

4. The exchangeable nozzle ( 200 ) according to claim 1 , said partially stabilized sintered zirconia having a MgO content in the range from 1 to 2.8% by mass.

5. The exchangeable nozzle ( 200 ) according to claim 1 , said partially stabilized sintered zirconia having a SiO 2 content not above 1.5% by mass.

6. The exchangeable nozzle ( 200 ) according to claim 1 , said partially stabilized sintered zirconia having a ZrO 2 +HfO 2 content of at least 92% by mass.

7. The exchangeable nozzle ( 200 ) according to claim 1 , said partially stabilized sintered zirconia having a ZrO 2 +HfO 2 content in the range from 94 to 97% by mass.

8. The exchangeable nozzle ( 200 ) according to claim 1 , said tubular member ( 201 ) comprising free carbon in an amount in the range from 0.1 to 4.0% by mass in relation to the mass of the tubular member ( 201 ) without said free carbon.

9. The exchangeable nozzle ( 200 ) according to claim 1 , wherein said tubular member ( 201 ) is embedded in a ceramic refractory material ( 203 ).

10. The exchangeable nozzle ( 200 ) according to claim 1 , wherein said ceramic refractory material ( 203 ) is at least partially covered by a metal shell ( 219 ).

11. The exchangeable nozzle ( 200 ) according to claim 1 , said exchangeable nozzle ( 200 ) being connectable to an upper nozzle ( 100 ) of a nozzle changer system ( 11 ) for billet casting, wherein said upper nozzle ( 100 ) comprises an inner passageway ( 113 ) for guiding molten metal through said upper nozzle ( 100 ) and wherein said exchangeable nozzle ( 200 ) is connectable to said upper nozzle ( 100 ) such that, when said exchangeable nozzle ( 200 ) is connected to said upper nozzle ( 100 ), said inner passageway ( 113 ) of said upper nozzle ( 100 ) and said inner passageway ( 213 ) of said exchangeable nozzle ( 200 ) form a continuous channel.

12. A method for manufacturing an exchangeable nozzle, said method comprising the following steps:
13.1 providing a tubular member,
13.1.1 said tubular member extending along a longitudinal axis from a first end of said tubular member to a second end of said tubular member; said tubular member further comprising:
13.1.2 an inner passageway extending through said tubular member along said longitudinal axis from said first end of said tubular member to said second end of said tubular member;
13.1.3 an inlet opening into said inner passageway at said first end of said tubular member; and
13.1.4 an outlet opening into said inner passageway at said second end of said tubular member;
13.1.5 said tubular member comprising partly stabilized sintered zirconia;
13.1.6 said partly stabilized sintered zirconia being partly stabilized by MgO; and
13.1.7 said partly stabilized sintered zirconia having a degree of stabilization not above 20% by mass; and

13.2 impregnating said tubular member with a carbon containing impregnation.

13. A nozzle changer system ( 11 ) for billet casting, said nozzle changer system ( 11 ) comprising:
14.1 an upper nozzle ( 100 ), said upper nozzle ( 100 ) comprising an inner passageway ( 113 ) for guiding molten metal through said upper nozzle ( 100 );
14.2 an exchangeable nozzle ( 200 );
14.3 wherein said exchangeable nozzle ( 200 ) is exchangeable between a first position and a second position;
14.3.1 wherein in said first position, said exchangeable nozzle ( 200 ) is connected to said upper nozzle ( 100 ) such that said inner passageway ( 113 ) of said upper nozzle ( 100 ) and said inner passageway ( 213 ) of said exchangeable nozzle ( 200 ) form a continuous channel;
14.3.2 and wherein in said second position, said exchangeable nozzle ( 200 ) is released from said upper nozzle ( 100 ),

wherein said exchangeable nozzle ( 200 ) comprises:
a tubular member ( 201 );
said tubular member ( 201 ) extending along a longitudinal axis (L) from a first end ( 209 ) of said tubular member ( 201 ) to a second end ( 211 ) of said tubular member ( 201 );
said tubular member ( 201 ) comprising:
an inner passageway ( 213 ) extending through said tubular member ( 201 ) along said longitudinal axis (L) from said first end ( 209 ) of said tubular member ( 201 ) to said second end ( 211 ) of said tubular member ( 201 );
an inlet ( 215 ) opening into said inner passageway ( 213 ) at said first end ( 209 ) of said tubular member ( 201 ); and
an outlet ( 217 ) opening into said inner passageway ( 213 ) at said second end ( 211 ) of said tubular member ( 201 );
said tubular member ( 201 ) comprising partially stabilized sintered zirconia;
said partially stabilized sintered zirconia being partially stabilized by MgO; and
said partially stabilized sintered zirconia having a degree of stabilization not above 20% by mass; and
said tubular member ( 201 ) comprising free carbon.

14. A tundish ( 1 ) comprising a nozzle changer system ( 11 ) according to claim 13 .

Assignees

• Refractory Intellectual Property Gmbh & Co Kg

Inventors

• Grasset-Bourdel Renaud
• Wiesel Martin
• Jain Neha

Classifications

• B22D41/54 Primary

  characterised by the materials used therefor · CPC title

• B22D41/00

  Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like (B22D39/00, B22D43/00 take precedence) · CPC title

• B22D41/56

  Means for supporting, manipulating or changing a pouring-nozzle · CPC title

• B22D11/0642 Primary

  Nozzles (nozzles used in open-ended moulds B22D41/50) · CPC title