Rail and method of manufacturing rail

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12264373
APP PUB NO 20210395847A1
SERIAL NO

17271266

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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According to one aspect of the present invention, what is provided is a rail including, by mass %: C: 0.75% to 1.20%; Si: 0.10% to 2.00%; Mn: 0.10% to 2.00%; Cr: 0.10% to 1.20%; V: 0.010% to 0.200%; N: 0.0030% to 0.0200%; P≤0.0250%; S≤0.0250%; Mo: 0% to 0.50%, Co: 0% to 1.00%; B: 0% to 0.0050%; Cu: 0% to 1.00%; Ni: 0% to 1.00%; Nb: 0% to 0.0500%; Ti: 0% to 0.0500%; Mg: 0% to 0.0200%; Ca: 0% to 0.0200%; REM: 0% to 0.0500%; Zr: 0% to 0.0200%; Al: 0% to 1.00%; and a remainder consisting of Fe and impurities, in which a structure ranging from an outer surface of a head portion as an origin to a depth of 25 mm includes 95% or greater of a pearlite structure by area ratio, the hardness of the structure is in a range of Hv 360 to 500, and in ferrite of the pearlite structure at a position at a depth of 25 mm from the outer surface of the head portion as the origin, the number density of a V nitride having a grain size of 0.5 to 4.0 nm and including Cr is in a range of 1.0×1017 to 5.0×1017 cm−3.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONTOKYO JAPAN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miyazaki, Teruhisa Tokyo, JP 12 55
Takahashi, Jun Tokyo, JP 295 3078
Tanahashi, Takuya Tokyo, JP 8 45
Ueda, Masaharu Tokyo, JP 42 281

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