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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.:

US 12054796 B1

PDFFull Text
Date of Patent:
Aug. 06, 2024

Filed:

Jun. 26, 2019

Method for producing steel

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Toshiaki Mizoguchi, Tokyo, JP;

Jun Takekawa, Tokyo, JP;

Shintaro Oga, Tokyo, JP;

Hidenori Kurimoto, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Myers Wolin, LLC

Primary Examiner:

Anthony M Liang

Assistant Examiner:

Danny N Kang

Int. Cl.
CPC ...
C21C 7/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/40 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
C21C 7/06 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01);
Abstract

A method for producing steel includes: (a) a step of adding the first group of alloys to molten steel having an amount of dissolved oxygen of 0.0050 mass % or more; (b) a step of, after the step of (a), adding deoxidizer to the molten steel for deoxidation; (c) a step of, after the step of (b), adding the second group of alloys to the deoxidized molten steel; and (d) a step of, after the step of (c), adding REM to the molten steel, wherein amounts of oxygen Ointroduced from the first group of alloys (mass %) and amounts of oxygen Ointroduced from the second group of alloys (mass %) satisfy [O≤0.00100], [O+O≥0.00150], and [O/O≥2.0], and satisfy a formula [0.05≤REM/T.O≤0.5] after the step of (d).

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