Title:
溶鋼の製造方法
Document Type and Number:
Japanese Patent JP7094259
Kind Code:
B2
Abstract:
In a method for producing a molten steel according to one aspect of the present invention, the solid-state direct reduced iron contains 3.0% by mass or more of SiO2 and Al2O3 in total and 1.0% by mass or more of carbon. A ratio of a metallic iron to the total iron content contained in the solid-state direct reduced iron is 90% by mass or more, and an excess carbon content Cx is 0.2% by mass or more to the carbons contained in the solid-state direct reduced iron. The method includes a step in a first furnace of melting 40 to 100% by mass of the solid-state direct reduced iron, and separating a molten pig iron having a carbon content of 2.0 to 5.0% by mass and a temperature of 1350 to 1550°C and a slag having a basicity of 1.0 to 1.4 and a step in a second furnace of melting a remainder of the solid reduced iron together with the molten pig iron separated in the first furnace and blowing oxygen onto the molten material to decarburize into a molten steel.
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Inventors:
Tokuda Koji
Takeshi Mimura
Takeshi Mimura
Application Number:
JP2019210829A
Publication Date:
July 01, 2022
Filing Date:
November 21, 2019
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
C21C5/52; C21B11/10
Domestic Patent References:
| JP200341310A | ||||
| JP200974119A | ||||
| JP201757431A |
Attorney, Agent or Firm:
Etsushi Kotani
Masataka Kotani
Aya Usami
Masataka Kotani
Aya Usami