High-strength galvanized steel sheet

A high-strength galvanized steel sheet having a chemical composition comprising, by mass %:

• C:
• 0.15% or more and 0.25% or less;
• Si:
• 0.50% or more and 2.5% or less;
• Mn:
• 2.3% or more and 4.0% or less;
• P:
• 0.100% or less;
• S:
• 0.02% or less;
• Al:
• 0.01% or more and 2.5% or less;
• at least one element selected from the group consisting of Nb:
• 0.005% or more and 0.1% or less, Ti:
• 0.005% or more and 0.1% or less, V:
• 0.01% or more and 1.0% or less, and Mo:
• 0.005% or more and 2.0% or less;
• and
• the balance being Fe and inevitable impurities,
• wherein the steel sheet has a microstructure comprising, in terms of area fraction, a tempered martensite phase:
• 30% or more and 73% or less, a ferrite phase:
• 25% or more and 68% or less, a retained austenite phase:
• 2% or more and 15% or less, other phases:
• 10% or less (including 0%) in total, the other phases comprising, in terms of area fraction, a martensite phase:
• 3% or less (including 0%), and bainitic ferrite phase:
• 0%,
• the tempered martensite phase having an average grain size of 8 μm or less,
• the ferrite phase having an average grain size of 5 μm or less, and
• the retained austenite phase having a C content less than 0.7% by mass.