High-yield-ratio high-strength galvanized steel sheet and method for manufacturing the same

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United States of America Patent

PATENT NO 11473180
APP PUB NO 20190032187A1
SERIAL NO

16072668

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Abstract

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Provided are a high-yield-ratio high-strength galvanized steel sheet and a method for manufacturing thereof. The high-yield-ratio high-strength galvanized steel sheet has a steel sheet having a specified chemical composition and a metallographic structure including, in terms of area ratio, in terms of area ratio, 15% or less of ferrite, 20% or more and 50% or less of martensite, and bainite and tempered martensite in a total amount of 30% or more, and a galvanized layer formed on the steel sheet having a coating weight of 20 g/m2 to 120 g/m2 per side, in which a yield strength ratio is 65% or more, a tensile strength is 950 MPa or more, and Mn oxides are contained in the galvanized layer in an amount of 0.015 g/m2 to 0.050 g/m2.

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Patent Owner(s)

  • JFE STEEL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Koba, Masaki Tokyo, JP 16 27
Masuoka, Hiroyuki Tokyo, JP 34 67
Nishimura, Yasuhiro Tokyo, JP 53 338
Tsuda, Seisuke Tokyo, JP 3 3
Yoshitomi, Hiromi Tokyo, JP 12 32

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