Steel sheet and method for manufacturing same

EP4640885A4Pending Publication Date: 2026-06-24POHANG IRON & STEEL CO LTD
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Patent Information

Application Number
EP2023907633
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-12-21
Filing Date
2023-12-15
Publication Date
2026-06-24

AI Technical Summary

Technical Problem

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.

Method used

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.

Benefits of technology

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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Abstract

The present invention relates to a steel sheet having excellent strength and toughness which can be used in offshore and onshore wind power generators, etc., and a method for manufacturing same.
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Citation Information

Patent Citations

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