Patent ID: 7891408

Claim:
A method of producing an immersion nozzle for continuous casting by which occurrence of cracks at a boundary between a CaO-containing refractory and a zirconia-containing refractory during a firing of the immersion nozzle in production thereof is prevented, the method comprising: subjecting at least a portion of clinker particles containing CaO as a mineral phase to an anti-hydration treatment to form said at least a portion of said clinker particle into surface-treated clinker particles; integrally molding a first refractory mixture and a second refractory mixture to form an integrally molded body with said immersion nozzle, said first refractory mixture being comprised of said clinker particles which include said surface-treated clinker particles, said first refractory mixture being applied to at least an inner-hole portion in a main body portion of the immersion nozzle to inhibit deposition of alumina thereon during said continuous casting; and said second refractory mixture being comprised of zirconia-graphite, said second refractory mixture being applied to a powder-line portion of the immersion nozzle; and performing the firing of the integrally formed body in a reducing atmosphere.