Hot rolled coated steel sheet having high strength, high formability, excellent bake hardenability and method of manufacturing same

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United States of America Patent

PATENT NO 11834727
APP PUB NO 20230167523A1
SERIAL NO

18103718

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Abstract

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The hot-rolled coated steel sheet comprising: in wt %, C: 0.05-0.14%, Si: 0.1-1.0%, Mn: 1.0-2.0%, P: 0.001-0.05%, S: 0.001-0.01%, AI: 0.01-0.1%, Cr: 0.005-1.0%, Ti: 0.005-0.13%, Nb: 0.005-0.03%, N: 0.001-0.01%, Fe residues, and other inevitable impurities; a mixed structure of ferrite and bainite as a main phase; and as a remaining structure, one or more selected from the group consisting of martensite, austenite, and phase martensite (MA), wherein a fraction of the ferrite and bainite is 95-99 area % and Equation 1 is satisfied. [Equation 1] FCO{110}<112>+FCO{112}<111>≥10 where, FCO{110}<112> and FCO{112}<111>, each representing an area fraction occupied by a structure having ac crystal orientation of {110}<112> and {112}<111>.

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Patent Owner(s)

Patent OwnerAddress
POSCO CO LTD6261 DONGHAEAN-RO NAM-GU GYEONGSANGBUK-DO POHANG-SI 37859

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kim, Sung-Il Gwangyang-si, KR 67 299
Na, Hyun-Taek Gwangyang-si, KR 23 21

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