Sheet steel product, a steel component produced from such a sheet steel product, and body for a motor vehicle

US10272644B2 · kind B2 · utility

Assignee

• ThyssenKrupp Steel Europe AG · DE

Inventors

• Jens Becker · Ludwigshafen am Rhein, DE
• Thomas Gerber · Papendorf, DE
• Julia Mura · Düsseldorf, DE
• Stefan Myslowicki · Mönchengladbach, DE

Key dates

• Filing date: Dec 19, 2014
• Grant date: Apr 30, 2019
• Expiry date: Sep 18, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/38
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A flat steel product is disclosed which is particularly suitable for the production of components for motor vehicle bodies by press-hardening, and which has insensitivity to cracking coupled with increased strength and has sufficient suitability for welding for incorporation into a welded construction. This combination of properties is achieved in accordance with the invention by virtue of the flat steel product having a core layer consisting of a steel alloyed with Mn, B and at least 0.3% by weight of C and having a tensile strength of more than 1500 MPa, and an outer layer cohesively bonded to the core layer. The C content of the outer layer is not more than 0.09% by weight. This flat steel product has, in the region of the outer layer, a tensile strength corresponding to not more than half the tensile strength of the steel of the core layer in the ready-hardened state, with the elongation A80 of the outer layer corresponding to at least 1.5 times the elongation A80 of the core layer in the ready-hardened state.