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AssigneeKrosakiharima Corporation
InventorsKatsumi Morikawa, Joki Yoshitomi, Keisuke Asano, Saeko Uchida
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Disclosed is a nozzle for continuous casting of clean steel, capable of preventing adhesion of Al2O3-based inclusions to a wall surface of the inner hole of the nozzle while fully achieving an effect of a swirl vane provided as a means to prevent occurrence of drift in molten steel passing through the inner hole. The swirl vane is disposed in the inner hole having the wall surface at least partly formed as a tubular-shaped refractory layer prepared by controlling a weight ratio of CaO/MgO and an apparent porosity to have a thickness of 3 to 20 mm, so as to prevent adhesion of Al2O3-based inclusions to the wall surface and the swirl vane while effectively maintaining the anti-drift effect for long hours. Further, inert gas is injected into a molten steel flow between an upper nozzle and the swirl vane to facilitate surfacing of Al2O3-based inclusions in a mold and reduce Al2O3-based inclusions in molten steel so as to achieve stable casting operation and high-quality steel with high cleanness.
-13. (canceled)
An immersion nozzle for continuous casting of steel, having an inner hole provided with a swirl vane for generating a swirling flow in molten steel passing therethrough, said inner hole having a wall surface adapted to come into contact with the molten steel during use, at least a part of wall surface being formed of a refractory layer containing CaO and MgO, said refractory layer being prepared by controlling a weight ratio of each of CaO and MgO in said refractory layer, and an apparent porosity.
The immersion nozzle as defined in claim 1, wherein said swirl vane is disposed in said inner hole on an upstream side relative to a position corresponding to a powder line.
A method for continuous casting of steel, using a continuous casting nozzle having an inner hole which is provided with a swirl vane for generating a swirling flow in molten steel passing therethrough, and defined by a wall surface adapted to come into contact with the molten steel during use, at least a part of said wall surface being formed of a tubular-shaped refractory layer, wherein:
Dependencies are inferred from the claim text.