The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2007
Filed:
Aug. 23, 2004
Katsumi Morikawa, Fukuoka, JP;
Joki Yoshitomi, Fukuoka, JP;
Keisuke Asano, Fukuoka, JP;
Saeko Uchida, Fukuoka, JP;
Katsumi Morikawa, Fukuoka, JP;
Joki Yoshitomi, Fukuoka, JP;
Keisuke Asano, Fukuoka, JP;
Saeko Uchida, Fukuoka, JP;
Krosakiharima Corporation, Fukuoka, JP;
Abstract
A nozzle for continuous casting of clean steel is capable of preventing adhesion of AlO-based inclusions to a wall surface of the inner hole of the nozzle while fully achieving an effect of a swirl vane. The swirl vane prevents drift in molten steel passing through the inner hole. The swirl vane is disposed in the inner hole. A wall surface is at least partly formed as a tubular-shaped refractory layer and is 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 AlO-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 AlO-based inclusions in a mold and reduce AlO-based inclusions in molten steel so as to achieve stable casting operation and high-quality steel with high cleanness.