Steel sheet and method for manufacturing same
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- POHANG IRON & STEEL CO LTD
- Filing Date
- 2023-12-15
- Publication Date
- 2026-06-24
AI Technical Summary
Existing steel materials for wind towers face challenges in achieving high strength and low-temperature impact toughness, especially when thickened, due to limitations in grain refinement during rolling and the need for costly normalizing heat treatments, which increase manufacturing costs.
A steel sheet composition with specific alloying elements (C, Si, Mn, P, S, Al, Nb, V, Ti, N) and controlled manufacturing processes, including heating, hot rolling, and air cooling, to achieve a microstructure with fine ferrite grains and omit normalizing heat treatment, ensuring strength and toughness.
The solution provides a steel sheet with yield strength of 355 MPa or more, tensile strength of 470 MPa or more, and Charpy impact absorption energy of 100 J or more at -20°C, while reducing manufacturing costs by omitting normalizing heat treatment.
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