Thyssenkrupp Stahl Ag

Michael Westholt

Frank Friedel

Sabine Zeizinger

Horst Berndsen

Manfred Meurer

The present invention relates to a method for the manufacture of galvannealed metal sheet, wherein a hot strip is produced from an IF steel containing 0.01 to 0.1 wt. % silicon, wherein the hot strip is coiled at a coiler temperature no lower than 700&#xb0; C. and no higher than 750&#xb0; C., wherein a cold strip is rolled from the coiled hot strip, wherein the cold strip is recrystallization-annealed in an annealing furnace in an annealing gas atmosphere, wherein the cold strip thus annealed is provided with a zinc coating in a zinc bath, and wherein the coated cold strip is post-annealed at a galvannealing temperature no lower than 500&#xb0; C. and no higher than 540&#xb0; C. The invention also relates to a galvannealed metal sheet which possesses improved adhesion of the coating layer to the base material and proposes a method which is suited for the manufacture of metal sheet having such properties.

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Castrop-Rauxel, Germany

Michael Westholt