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|1. (WO2018011978) HOT-DIP GALVANIZED STEEL SHEET|
|Applicants:||NIPPON STEEL & SUMITOMO METAL CORPORATION
|Title:||HOT-DIP GALVANIZED STEEL SHEET|
This hot-dip galvanized steel sheet has a specific chemical composition and a steel structure that is represented as: containing, in terms of area ratio, polygonal ferrite in an amount not more than 10%, upper bainite in an amount not more than 20%, residual austenite in an amount not more than 5%, and martensite in an amount not less than 70%; and a martensite that includes Fe carbides at a number density not less than 1×106/mm2, that is contained in an amount not less than 50% of the entire amount of martensite, and that has an average effective crystal grain size of not more than 5.0 μm.