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AssigneeKawasaki Steel Corporation
InventorsKazunori Osawa, Kei Sakata, Osamu Furukimi, Yoshitsugu Suzuki, Akio Shinohara
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A hot-dip galvanized high-strength steel sheet having superior workability and galvanizability containing: 0.01% to 0.20% by weight of C; 1.0% by weight or less of Si; more than 1.5% to 3.0% by weight of Mn; 0.10% by weight or less of P; 0.05% by weight or less of S; 0.10% by weight or less of Al; 0.010% by weight or less of N; 0.010% to 1.0% by weight in total of at least one element selected from the group consisting of Ti, Nb, and V; and the balance being Fe and incidental impurities; in which the steel sheet has the metal structure in which the areal rate of the ferrite phase is 50% or more, the ferrite phase has an average grain diameter of 10 μm or less, and the thickness of a band-like structure composed of the second phase satisfies the relationship Tb/T≦0.005, where Tb is the average thickness in the sheet thickness direction of the band-like structure and T is the thickness of the steel sheet, and a method for producing the same. To provide a method for producing a hot-dip galvanized high-strength steel sheet in which superior workability and high strength are obtained and moreover satisfactory galvanizability is obtained when galvanizing is performed using facilities such as a continuous galvanizing line.
A method for producing a hot-dip galvanized high-strength steel sheet having superior workability and galvanizability, wherein the steel sheet has a metal structure in which the areal rate of a ferrite phase is 50% or more, the ferrite phase has an average grain diameter of 10 μm or less, and the thickness of a band structure comprising a second phase satisfies the relationship Tb/T≦0.005, where Tb is the average thickness in the sheet thickness direction of the band structure and T is the thickness of the steel sheet, the method comprising the steps of:
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