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. 06, 2009
Filed:
Apr. 30, 2004
Ken-ichiro Hara, Myrtle Beach, SC (US);
Hidemi Takao, Matsue, JP;
Setsuo Mishima, Matsue, JP;
Etsuo Fujita, Meerbusch, DE;
Ken-ichiro Hara, Myrtle Beach, SC (US);
Hidemi Takao, Matsue, JP;
Setsuo Mishima, Matsue, JP;
Etsuo Fujita, Meerbusch, DE;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A method for producing a steel ingot, which comprises an Mg oxide forming step of preparing a molten steel containing Mg in an amount sufficient for the molten steel to have an oxide composition having MgO as a primary component and a dissociation step of keeping the pressure of the atmosphere around the molten steel to be lower than that in the Mg oxide forming step, to thereby dissociate MgO to Mg and oxygen and reduce the content of Mg in the steel to 50% or less of that in the Mg oxide forming step through the diffusion thereof into a gas phase. A preferred method further involves a solidifying step.