RAIL AND MANUFACTURING METHOD THEREFOR
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United States of America Patent
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Sep 29, 2022
app pub date -
Jun 9, 2020
filing date -
Jun 9, 2020
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Abstract
A rail comprises a predetermined chemical composition. In a hardness distribution in a region from a rail head surface to a depth of 16.0 mm, a part having higher hardness than V1 that is minimum hardness in a first internal region is present in a second internal region, and hardness of the rail head surface is HBW 400 to 520 and average hardness in the region from the rail head surface to the depth of 16.0 mm is HBW 350 or more.
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