Hot-rolled steel sheet, method for making the same, and worked body of hot-rolled steel sheet

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United States of America Patent

PATENT NO 8828154
APP PUB NO 20090252641A1
SERIAL NO

11887285

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A steel sheet contains, in terms of percent by mass, C: 0.01 to 0.2%, Si: 2.0% or less, and Mn: 3.0% or less and has a martensite phase as dominant phase and ferrite with a grain size of 20 μm or less as a second phase. The ferrite is contained in area ratio of 1% to 30% and the amount of solute carbon being 0.01 percent by mass of more. The steel sheet can provide a hot-rolled steel sheet suitable for automobile steel sheet, i.e., has excellent press workability and excellent strain aging property whereby the tensile strength significantly increases by heat treatment at about the same temperature as typical baking process after the press-working. Moreover, hardening of the ferrite phase improves the fatigue strength after the strain aging.

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Patent Owner(s)

  • JFE STEEL CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hoshi, Toru Tokyo, JP 28 373
Matsuoka, Saiji Tokyo, JP 47 594

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