Process for manufacturing steel sheet

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United States of America Patent

PATENT NO 10370746
APP PUB NO 20180010220A1
SERIAL NO

15711335

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Abstract

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The invention relates to a hot-rolled steel sheet having a tensile strength of greater than 1200 MPa, an Re/Rm ratio of less than 0.75 and an elongation at break of greater than 10%, the composition of which contains, the contents being expressed by weight: 0.10%≤C≤0.25%; 1%≤Mn≤3%; Al≥0.015%; Si≤1.985%; Mo≤0.30%; Cr≤1.5%; S≤0.015%; P≤0.1%; Co≤1.5%; B≤0.005%; it being understood that 1%≤Si+Al≤2%; Cr+(3×Mo)≥0.3%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting, the microstructure of the steel consisting of at least 75% bainite, residual austenite in an amount equal to or greater than 5% and martensite in an amount equal to or greater than 2%.

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Patent Owner(s)

Patent OwnerAddress
ARCELORMITTAL24 - 26 BLVD D'AVRANCHES LUXEMBOURG L-1160

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Allain, Sebastien Metz, FR 5 54
Colin, Christine Maizieres les Metz, FR 2 14
Couturier, Audrey Metz, FR 3 16
Iung, Thierry Jarny, FR 6 31

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