Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reissue Patent
1995-11-13
2009-12-08
Wyszomierski, George (Department: 1793)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S584000, C148S320000
Reissue Patent
active
RE041033
ABSTRACT:
This invention is directed to improve a wear resistance and a damage resistance required for a rail of a sharply curved zone of a heavy load railway, comprising more than 0.85 to 1.20% of C, 0.10 to 1.00% of Si, 0.40 to 1.50% of Mn and if necessary, at least one member selected from the group consisting of Cr, Mo, V, Nb, Co and B, and retaining high temperature of hot rolling or a steel rail heated to a high temperature for the purpose of heat-treatment, the present invention provides a pearlitic steel rail having a good wear resistance and a good damage resistance, and a method of producing the same, wherein a head portion of the steel rail is acceleratedly cooled at a rate of 1° to 10° C./sec from an austenite zone temperature to a cooling stop temperature of 700° to 500° C. so that the hardness of the head portion is at least Hv 320 within the range of a 20 mm depth.
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Babazono Koji
Kageyama Hideaki
Kutaragi Ken
Uchino Kouichi
Ueda Masaharu
Birch & Stewart Kolasch & Birch, LLP
Nippn Steel Corporation
Wyszomierski George
LandOfFree
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