Method for producing a steel component

US10301700B2 · kind B2 · utility

Assignee

• ThyssenKrupp Steel Europe AG · DE

Inventors

• Brigitte Hammer · Voerde, DE
• Thomas Heller · Pittsburgh, US
• Frank Hisker · Bottrop, DE
• Rudolf Kawalla · Bottrop, DE
• Grzegorz Korpala · Freiberg, DE

Key dates

• Filing date: Aug 18, 2014
• Grant date: May 28, 2019
• Expiry date: Jun 25, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/001
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A complexly formed steel component may have a tensile strength Rm of greater than 1200 MPa and an elongation at break A50 of greater than 6%. Example methods for producing such components comprise providing a flat steel product, which in addition to iron and unavoidable impurities, contains in percent by weight 0.10-0.60% C, 0.4-2.5% Si, up to 3.0% Al, 0.4-3.0% Mn, up to 1% Ni, up to 2.0% Cu, up to 0.4% Mo, up to 2% Cr, up to 1.5% Co, up to 0.2% Ti, up to 0.2% Nb, and up to 0.5% V. At least 10% by volume of a microstructure of the flat steel product may consist of residual austenite comprising globular residual austenite islands with a grain size of at least 1 μm. Before being cooled, the flat steel product may be heated to a forming temperature of 150-400° C. and formed into a component with a degree of forming that is at most equal to uniform elongation Ag.