A steelmaking method
A multi-step steelmaking process addresses the challenge of controlling carbon, sulfur, and titanium levels in steel production, ensuring high-quality non-oriented electrical steel through desulfurization and decarburization, achieving controlled elemental levels and improved productivity.
WO2025219739A1PCT designated stage Publication Date: 2025-10-23ARCELORMITTAL SA
Patent Information
- Application Number
- PCT/IB2024/053670
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-10-23
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Abstract
The invention relates to a steelmaking method comprising the following successive steps: − producing hot metal in a blast furnace, the content in sulfur of said hot metal being below 500 ppm in weight, − tapping said hot metal in a vessel and submitting it to a first desulfurization step by adding desulfurization agents and creating a slag layer to which part of said sulfur is transferred to reach a content of sulfur below 50 ppm in weight in the hot metal, − removing said slag and transferring the hot metal into a BOF and submitting it to a first decarburization step, − tapping the resulting liquid steel into a ladle and submitting it to a second decarburization step, − performing an alloying step, − performing a second desulfurization step, − proceeding to an optional final alloying step using ferro-alloys containing less than 300 ppm in weight of titanium, to obtain a liquid steel having a sulfur content below 30 ppm in weight, a titanium content below 100 ppm in weight and a carbon content below 50 ppm in weight, − casting said liquid steel.
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Citation Information
Patent Citations
Smelting methods for high-grade silicon steel
CN114672718B
Method for controlling extremely low ti in extra low carbon alsi-killed steel
US20130056167A1