RAIL MANUFACTURING METHOD AND RAIL MANUFACTURING APPARATUS
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United States of America Patent
Stats
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N/A
Issued Date -
Oct 5, 2017
app pub date -
Sep 10, 2015
filing date -
Sep 22, 2014
priority date (Note) -
Published
status (Latency Note)
Importance
Abstract
A method and an apparatus for manufacturing a rail having high ductility in both a head portion and a foot portion. A heated steel rail material is hot-rolled, the temperature is adjusted by cooling the hot-rolled steel rail material, the steel rail material subjected to the temperature adjustment is processed into a rail shape by means of temperature-adjusted rolling at an area reduction ratio of 20% or more, and, in adjusting the temperature of the steel rail material, the surface portions of the steel rail material corresponding to a head portion and a foot portion of the rail shape so that the temperatures of the surface portions reach 500° C. or more and 1,000° C. or less.
First Claim
Other Claims data not available