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:
Apr. 03, 2012
Filed:
Apr. 23, 2007
Takashi Miyake, Kakogawa, JP;
Hitoshi Nakata, Kakogawa, JP;
Tsuyoshi Mimura, Kakogawa, JP;
Tomoaki Omoto, Chiyoda-ku, JP;
Yukimasa Iwamoto, Chiyoda-ku, JP;
Takashi Miyake, Kakogawa, JP;
Hitoshi Nakata, Kakogawa, JP;
Tsuyoshi Mimura, Kakogawa, JP;
Tomoaki Omoto, Chiyoda-ku, JP;
Yukimasa Iwamoto, Chiyoda-ku, JP;
Kobe Steel, Ltd., Kobe-shi, JP;
Abstract
A method of continuously casting molten steel to produce high surface quality slab by preventing depressions and cracking. The steel is high Al steel having an Al content of 0.1% or more. High-Al molten steel is continuously cast using mold powder containing T—CaO (T—CaO presumes total Ca converted to CaO): 35 to 55%, SiO: 10 to 30%, AlO: 4.0% or less (excluding 0%), MgO: 0.2 to 1.0%, LiO: 7 to 13%, F: 7 to 13%, C: 10.5 to 14%, and inevitable impurities; and satisfying: 1.6≦[T—CaO]/[SiO]≦5 and 0.2≦[LiO]/[SiO]≦1.1. The method is performed by controlling the molten steel surface level fluctuation speed in the mold; the pouring angle of the molten steel in the width direction of the mold; the stroke in the amplitude; and the negative strip time tN as defined.