High-strength flat steel product

US10934602B2 · kind B2 · utility

Assignees

• ThyssenKrupp Steel Europe AG · DE
• thyssenkrupp AG · DE

Inventors

• Alexander Gaganov · Mülheim an der Ruhr, DE
• Wolfgang Gervers · Duisburg, DE
• Andreas Kern · Roth, DE
• Gabriel Kolek · Witten, DE
• Elena Schaffnit · Düsseldorf, DE
• Hans-Joachim Tschersich · Dorsten, DE

Key dates

• Filing date: Mar 6, 2019
• Grant date: Mar 2, 2021
• Expiry date: May 27, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/002
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A hot rolled flat steel product including (in % by weight) of C: 0.05-0.08%, Si: 0.015-0.500%, Mn: 1.60-2.00%, P: up to 0.025%, S: up to 0.010%, Al: 0.020-0.050%, N: up to 0.006%, Cr: up to 0.40%, Nb: 0.060-0.070%, B: 0.0005-0.0025%, Ti: 0.090-0.130%, unavoidable impurities including up to 0.12% Cu, up to 0.100% Ni, up to 0.010% V, up to 0.004% Mo, and up to 0.004% Sb, and the remainder being iron. The hot rolled flat steel product has a yield strength of 700-850 MPa, a fracture elongation of at least 12%, and a microstructure of at least 70% by volume bainitic microstructure.