Abstract: 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?0.2, Nb<0.05, Mo<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 ?10, polygonal ferrite ?10, balance bainite+tempered martensite 50-90, c) a tensile strength (Rm) 1180-1300 MPa, a yield strength (Rp0.2) 800-970 MPa, an elongation (A50) ?8%, or an elongation (A80) ?6%, and d) a bendability value Ri/t of ?4 for a sample having the size of 35 mm×100 mm, wherein Ri is the bending radius in mm and t is the thickness in mm of the steel sheet.

Abstract: A high strength galvannealed steel sheet having, a) a composition consisting of the following elements (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?0.2 Nb<0.05 Mo<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?10 polygonal ferrite?10 balance bainite+tempered martensite 50-90, c) at least one of the following mechanical properties a tensile strength (Rm) 1180-1300 MPa a yield strength (Rp0.2) 800-970 MPa an elongation (A50)?8% an elongation (A80)?6%, and d) a bendability according to a 90° V Bend test value Ri/t of ?4 for a sample having the size of 35 mm×100 mm, wherein Ri is the bending radius in mm and t is the thickness in mm of the steel sheet.