METHOD FOR DEOXIDIZING/REFINING MOLTEN STEEL, METHOD FOR PRODUCING STEEL MATERIAL, AND STEEL MATERIAL THEREOF

Title:

METHOD FOR DEOXIDIZING/REFINING MOLTEN STEEL, METHOD FOR PRODUCING STEEL MATERIAL, AND STEEL MATERIAL THEREOF

Document Type and Number:

WIPO Patent Application WO/2023/013377

Kind Code:

A1

Abstract:

Provided is a technology which improves the yield rate of added Al without increasing vacuum refining costs. Also provided is a method for producing a steel material which has little Al component quantity variation. This deoxidizing/refining method for molten steel which uses a vacuum refining device involves adding an Al-containing substance to molten steel inside a vacuum chamber, and executing molten steel deoxidation and refining in a manner such that the temperature changes ΔT1 and ΔT2 in the molten steel during Al deoxidation satisfy formula (1). The added Al-containing substance preferably has an Al content of 30-80 mass%. Thus, it is possible to produce a steel material having an Al concentration range of 0.02 mass% or less following the deoxidation step, with said molten steel deoxidizing/refining method as the deoxidation step. (1): ΔT1+ΔT2<0; ΔT1 represents the increase in temperature caused by oxidation reaction heat, and ΔT2 represents the decrease in temperature caused by the sensible heat from the added Al-containing substance.

Inventors:

MIZOBATA KEISUKE (JP)
NEGISHI HIDEMITSU (JP)
MURAI TAKESHI (JP)

Application Number:

PCT/JP2022/027639

Publication Date:

February 09, 2023

Filing Date:

July 14, 2022

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C21C7/10; C21C7/04; C21C7/06

Foreign References:

JP2002241832A	2002-08-28
JP2007092159A	2007-04-12
JP2007177296A	2007-07-12
JPH03211216A	1991-09-17