High-strength galvanized steel sheet and method for producing the same

A galvanized steel sheet, the steel sheet having a chemical composition comprising:

• C:
• 0.15% or more and 0.25% or less, by mass %;
• Si:
• 0.50% or more and 2.5% or less, by mass %;
• Mn:
• 2.3% or more and 4.0% or less, by mass %;
• P:
• 0.100% or less, by mass %;
• S:
• 0.02% or less, by mass %;
• Al:
• 0.01% or more and 2.5% or less, by mass %;
• and
• Fe and inevitable impurities,
• wherein the steel sheet has a microstructure containing, in terms of area fraction:
• a tempered martensite phase:
• 30% or more and 73% or less, where the tempered martensite phase has an average grain size of 8 μm or less,
• a ferrite phase:
• 25% or more and 68% or less,
• a retained austenite phase:
• 2% or more and 20% or less, where the retained austenite phase has a C content of less than 0.7% by mass, and
• other phases:
• 10% or less (including 0%),
• of which other phases containing:
• (i) a martensite phase:
• 3% or less (including 0%), and (ii) a bainitic ferrite phase:
• less than 5% (including 0%).