HOT-ROLLED STEEL SHEET

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United States of America Patent

APP PUB NO 20180044749A1
SERIAL NO

15551171

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Abstract

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A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which include, by area ratio, ferrite and bainite in a range of 80% to 98% in total, and martensite in a range of 2% to 10%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary, and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 10% to 60%.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
SHUTO, Hiroshi Oita-shi, JP 24 49
SUGIURA, Natsuko Kimitsu-shi, JP 32 175
WAKITA, Masayuki Osaka, JP 18 39
YOKOI, Tatsuo Oita-shi, JP 42 142
YOSHIDA, Mitsuru Himeji-shi, JP 46 274

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