Internal high hardness type pearlitic rail with excellent wear resistance and rolling contact fatigue resistance and method for producing same

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7955445
APP PUB NO 20100116381A1
SERIAL NO

12593463

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and incidental impurities, in which the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and in which the internal hardness of a rail head that is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm is greater than or equal to 380 Hv and less than 480 Hv.

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Patent Owner(s)

  • JFE STEEL CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Honjo, Minoru Tokyo, JP 25 42
Kimura, Tatsumi Tokyo, JP 27 68
Mitao, Shinji Tokyo, JP 14 58
Nishimura, Kimihiro Tokyo, JP 25 174
Shikanai, Nobuo Tokyo, JP 15 96
Suzuki, Shinichi Tokyo, JP 285 3471

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