Voestalpine Stahl Gmbh

Toyota Motor Europe Nv/sa

Markus Anzenberger

Thomas Hebesberger

Florian Winkelhofer

Edip Oze Arman

High strength galvannealed steel sheet having, a) a composition consisting of (in wt. %): C 0.10-0.2, Mn 2.0-3.0, Si 0.2-0.5, Cr 0.1-0.7, Ti 0.01-0.07, Al&#x2264;0.2, Nb&#x3c;0.05, Mo&#x3c;0.1, optionally B 0.001-0.005, balance Fe apart from impurities, b) a multiphase microstructure comprising (in vol. %) retained austenite 4-20, martensite 5-25, bainitic ferrite &#x2264;10, polygonal ferrite &#x2264;10, balance bainite+tempered martensite 50-90, c) a tensile strength (Rm) 1180-1300 MPa, a yield strength (R) 800-970 MPa, an elongation (A50) &#x2265;8%, or an elongation (A80) &#x2265;6%, and d) a bendability value Ri/t of &#x2264;4 for a sample having the size of 35 mm&#xd7;100 mm, wherein Ri is the bending radius in mm and t is the thickness in mm of the steel sheet.

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Linz, Austria

Markus Anzenberger