High-strength galvanized steel sheet and method for manufacturing the same
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United States of America
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Dec 16, 2014
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Dec 16, 2014
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Abstract
Provided are a high-strength galvanized steel sheet which can preferably be used as a material for automobile parts and a method for manufacturing the steel sheet. The steel sheet has a C content of 0.15% or less, in which an area ratio of ferrite is 10% or less, an area ratio of bainitic ferrite is 2% or more and 30% or less, an area ratio of martensite is 60% or more and 98% or less, an area ratio of retained austenite is less than 2%, an average grain diameter of martensite adjacent to bainite is 15 μm or less, a proportion of massive martensite adjacent only to bainite to the whole metallographic structure is 10% or less, and a value (ΔHv) calculated by subtracting the Vickers hardness at a position located at 20 μm from the surface of the steel sheet from the Vickers hardness at a position located at 100 μm from the surface of the steel sheet is 30 or more.
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