High-strength, damage-resistant rail having hardness distribution of excellent damage-resistance at its head top portion
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United States of America Patent
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Mar 26, 2002
Issued Date -
N/A
app pub date -
Jan 14, 1999
filing date -
Jul 4, 1996
priority date (Note) -
Expired
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Abstract
A high-strength, high damage-resistant rail made of 0.6 to 0.85 wt % C, 0.1 to 1.0 wt % Si, 0.5 to 1.5 wt % Mn, 0.035 wt % or less P, 0.040 wt % or less S, and 0.05 wt % or less Al, with the balance being Fe and inevitable impurities, and having corner and head side portions having a Brinell hardness of 341 to 405, and a head top portion in which a Brinell hardness of a site 20-mm distant from the central portion of the head top portion in a width direction is 341 to 405, and a hardness of the central portion of the head top portion is at least 10 lower in Brinell hardness than that of the site 20-mm distant from the central portion.
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