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:
Aug. 31, 2010
Filed:
Sep. 05, 2006
Toshiaki Mizoguchi, Tokai, JP;
Masanobu Hayakawa, Tokai, JP;
Yoshiaki Suematsu, Tokai, JP;
Akira Mikasa, Tokai, JP;
Toshiaki Mizoguchi, Tokai, JP;
Masanobu Hayakawa, Tokai, JP;
Yoshiaki Suematsu, Tokai, JP;
Akira Mikasa, Tokai, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention provides a continuous casting method of steel preventing alumina and other nonmetallic inclusions becoming causes of slivers and argon bubbles becoming causes of blowholes from being entrained and thereby enabling the production of a cast slab superior in surface and internal quality, that is, one giving an inside boreof an immersion nozzlea horizontal sectional shape of an elliptical shape or oblong shape with a length ratio D/Dof that long axis Dand short axis Dof 1.2 to 3.8, making a direction of that long axis substantially parallel to a long side direction of the casting moldand making the sliding direction of the sliding nozzlea direction perpendicular to said long axis to supply the molten steel in the casting mold. Note that a ratio S/Sof a sectional area Sat a smallest sectional area partof the inside boreand a sectional area Sof a nozzle holeof the sliding nozzleis made 0.5 to 0.95