Nippon Steel Corporation

Jun Takekawa

Toshiaki Mizoguchi

Shintaro Oga

Hidenori Kurimoto

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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Tokyo, Japan

Jun Takekawa