Thyssenkrupp Steel Europe Ag

Grzegorz Korpala

Rudolf Kawalla

Thomas Heller

Brigitte Hammer

Frank Hisker

Rudolf ProfDr-Ing Kawalla

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 &#x3bc;m. Before being cooled, the flat steel product may be heated to a forming temperature of 150-400&#xb0; C. and formed into a component with a degree of forming that is at most equal to uniform elongation Ag.

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Grzegorz Korpala