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EP0423793A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Nozzle for continuous casting and method of producing the same

Assignee: JFE Steel Corp
•
Filing: 1990-10-18
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Granted: —
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Expires: 2010-10-18
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Abstract

Abstract A nozzle for use in continuous casting comprising an inner surface region defining the nozzle port for passing a molten steel, said inner surface region being formed from a mixture having a composition containing 50 to 80 wt% of boron nitride (BN) and 20 to 50 wt% of zirconium oxide (ZrO₂), and a sintering assistant composed of silicon carbide (SiC) and boron carbide (B₄C) mixed at a weight ratio of 1 : 1, the sintering assistant being added in amount of 5 to 10 wt parts to 100 wt parts of said mixture. The nozzle is produced by a process comprising the steps of: forming a uniform mixture of fine particles of boron nitride (BN), zirconium oxide (ZrO₂), silicon carbide (SiC) and boron carbide (B₄C); forming the mixture into a cylindrical blank;and fixing the cylindrical blank in the bore of a nozzle member by means of a joint filling material.

Inventors

  • 👤 Mitsuo C/O Technical Research Div. Saito
  • 👤 Kenichi C/O Technical Research Div. Sorimachi
  • 👤 Toshikazu C/O Technical Research Div. Sakuraya

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 13:50
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; B22D41/00; B22D41/50; B22D41/52; B22D41/54; C04B35/515; C04B35/58; C04B35/583; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3244; C04B2235/38; C04B2235/3817; C04B2235/3821; C04B2235/3826; C04B2235/3852; C04B2235/386

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 93 words
A nozzle for use in continuous casting comprising an inner surface region defining the nozzle port for passing a molten steel, said inner surface region being formed from a mixture having a composition containing 50 to 80 wt% of boron nitride (BN) and 20 to 50 wt% of zirconium oxide (ZrO₂), and a sintering assistant composed of silicon carbide (SiC) and boron carbide (B₄C) mixed at a weight ratio of 1 : 1, said sintering assistant being added in amount of 5 to 10 wt parts to 100 wt parts of said mixture.
Claim 2
Dependent Claim 93 words
A nozzle for use in continuous casting comprising an inner surface region defining the nozzle port for passing a molten steel, said inner surface region being formed from a mixture having a composition containing 50 to 80 wt% of boron nitride (BN) and 20 to 50 wt% of zirconium oxide (ZrO₂), and a sintering assistant composed of silicon carbide (SiC) and boron carbide (B₄C) mixed at a weight ratio of 1 : 1, said sintering assistant being added in amount of 5 to 10 wt parts to 100 wt parts of said mixture.
Claim 3
Independent Claim 59 words
A method of producing a nozzle for continuous casting comprising the steps of: forming a uniform mixture of fine particles of boron nitride (BN), zirconium oxide (ZrO₂), silicon carbide (SiC) and boron carbide (B₄C); forming said mixture into a cylindrical blank;and fixing said cylindrical blank in the bore of a nozzle member by means of a joint filling material.
Claim 4
Independent Claim 59 words
A method of producing a nozzle for continuous casting comprising the steps of: forming a uniform mixture of fine particles of boron nitride (BN), zirconium oxide (ZrO₂), silicon carbide (SiC) and boron carbide (B₄C); forming said mixture into a cylindrical blank;and fixing said cylindrical blank in the bore of a nozzle member by means of a joint filling material.
Claim 5
Dependent Claim 78 words
A method of producing a nozzle for continuous casting according to Claim 2, wherein said cylindrical blank is formed by uniformly mixing the fine particles of BN, ZrO₂ and B₄C, pelletizing the mixture with addition of an organic binder, charging the pellets into a space defined by partition mold walls inside a rubber forming mold, forming said pellets into a cylindrical body by a rubber press process after removal of partition mold walls, and sintering the cylindrical body.
Claim 6
Independent Claim 36 words
A method of producing a nozzle for continuous casting according to one of Claims 2 and 3, wherein said fine particles of BN, ZrO₂ and B₄C have particle sizes which are not greater than 5 µm.

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