Rahmenelement

Details

Veröffentlichungs-Nr.

EP4752252

Anmeldetag

3. Oktober 2024

Veröffentlichung

10. April 2025

Rechtsraum

EP

Abstract

To provide a structural member with a tensile strength of 980 MPa or more and 1.8 GPa or less and good axial crushing characteristics. A structural member including a steel sheet having a base steel sheet, wherein the structural member has a cross-sectional shape that includes a top sheet portion extending in a width direction, and two vertical wall portions extending from both ends in a width direction of the top sheet portion in a direction different from a direction of extension of the top sheet portion, the base steel sheet of the top sheet portion has, in a surface layer, a surface soft layer with a Vickers hardness that is 84% or less of a Vickers hardness at a quarter thickness, the surface soft layer has a thickness satisfying the following formula (1), and the structural member has a tensile strength of 980 MPa or more and 1.8 GPa or less, 20 ≤ X ≤ 0.1 × t − 3800 × Sb − 1900 × Sn wherein X denotes the thickness of the surface soft layer (µm), t denotes a thickness of the base steel sheet (µm), and [Sb] and [Sn] denote an Sb content and a Sn content (% by mass) of the base steel sheet, respectively.

Anmelder

Firma

JFE Steel Corporation

Land

🇯🇵 Japan