GALVANIZED STEEL SHEET AND MEMBER, AND METHOD OF PRODUCING SAME
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United States of America
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Issued Date -
Mar 13, 2025
app pub date -
Oct 12, 2022
filing date -
Oct 12, 2022
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Abstract
Provided is a galvanized steel sheet having high strength, excellent ductility, excellent strain hardenability in a low strain range, and excellent strain hardenability in a high strain range. A base steel sheet has a defined chemical composition and a steel microstructure as follows: area fraction of ferrite: 20.0% or more and 90.0% or less, area fraction of bainitic ferrite: 4.0 % or more and 60.0% or less, area fraction of tempered martensite: 20.0% or less (including 0%), area fraction of retained austenite: 3.0% or more, area fraction of fresh martensite: 20.0% or less (including 0%), SF+SBF: 55.0% or more and 95.0% or less, SMA1: 4.0% or more, and SMA2: 1.5% or more.
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