High-strength steel sheet, member produced using high-strength steel sheet, automotive framework structural component or automotive reinforcing component comprising member, and production methods for high-strength steel sheet and member

A high-strength steel sheet with a tailored chemical composition and microstructure, combined with a precise production process, addresses the challenges of component strength, ductility, and low-temperature toughness, enhancing automotive framework structural performance.

US20260168061A1Pending Publication Date: 2026-06-18JFE STEEL CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
JFE STEEL CORP
Filing Date
2022-12-08
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

High-strength steel sheets used in automotive framework structural components require excellent component strength, ductility, stretch flangeability, bendability of sheared end surface portions, and low-temperature toughness, which are not adequately addressed by existing technologies, especially when used in low-temperature environments.

⚗Method used

A high-strength steel sheet with a specific chemical composition and microstructure, including controlled area ratios of martensite, bainite, ferrite, and retained austenite, along with metastable carbides, and a production process involving hot rolling, pickling, cold rolling, and controlled heating and cooling, to achieve desired mechanical properties.

🎯Benefits of technology

The steel sheet exhibits excellent component strength, ductility, stretch flangeability, bendability, and low-temperature toughness, suitable for automotive framework structural components.

✦ Generated by Eureka AI based on patent content.

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Abstract

Provided is a high-strength steel sheet excellent in component strength, ductility, stretch flangeability, bendability of sheared end surface portions, and low-temperature toughness. The high-strength steel sheet comprises: a predetermined chemical composition; and a microstructure at a position of ¼ of a sheet thickness of the high-strength steel sheet in which an area ratio of martensite is 10% to 80%, an area ratio of bainite is 2% to 70%, an area ratio of ferrite is 80% or less, an area ratio of retained austenite is 15% or less, and a proportion of a number of martensite blocks in which metastable carbides are present to that of martensite blocks is 2% or more, wherein when nanohardness is measured at 225 points or more at the position of ¼ of the sheet thickness, a standard deviation σn of the nanohardness is 0.60×[Hn]ave or less.
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