Patent ID: 9322091
Filing Date: 2016-04-26
CPC Classification: B32B,C21D,C22C,C23C,C25D,Y10T

Claim Text:
1. A high-strength galvanized steel sheet formed into a coil and having crashworthiness and excellent uniformity of mechanical characteristics, comprising, on a mass percent basis, C: more than 0.060% and 0.13% or less, Si: 0.01% or more and 0.7% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.100% or less, S: 0.010% or less, sol.Al: 0.005% or more and 0.100% or less, N: 0.0100% or less, Nb: 0.005% or more and 0.10% or less, Ti: 0.03% or more and 0.15% or less, and the balance comprising Fe and incidental impurities, and satisfying the following formula (1), wherein the high-strength galvanized steel sheet has a structure including ferrite and martensite, the ferrite having an average grain diameter of 15 μm or less and an area percentage of 80% or more, the martensite having an area percentage of 1% or more and 15% or less: wherein Ti*=Ti−(48/14)N−(48/32)S, and C, Nb, Ti, N, and S denote the corresponding content (mass %) of the steel; wherein the high-strength galvanized steel sheet has a tensile strength (TS) of 590 MPa or more, a yield ratio (YR) of 0.70 or more, and a bake hardenability (BH) level of 60 MPa or more.