Patent ID: 9157132
Filing Date: 2015-10-13
Classification: B32B,C21D,C22C,C23C

Abstract:
1. A high-strength galvanized steel sheet having excellent formability, the steel sheet having a component composition containing, on the basis of mass percent, 0.05 to 0.2% C, 1.05 to 2.5% Si, 1.5 to 3.0% Mn, 0.001 to 0.05% P, 0.0001 to 0.01% S, 0.001 to 0.1% Al, and 0.0005 to 0.01% N, the balance being Fe and incidental impurities; and the steel sheet having a microstructure including a ferritic phase and a martensitic phase including a tempered-martensitic phase, the ferritic phase having an area fraction of 30% or more relative to an entirety of the microstructure, the martensitic phase having an area fraction of 30 to 50% relative to the entirety of the microstructure, and the tempered-martensitic phase having an area fraction of 70% or more and 94% or less relative to an entirety of the martensitic phase.