C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/12 (2006.01) C22C 38/04 (2006.01) C22C 38/26 (2006.01) C22C 38/48 (2006.01) E01B 5/02 (2006.01) C21D 9/04 (2006.01)
Patent
CA 2310521
The present invention provides a pearlitic steel railroad rail which comprises 0.75 to 0.84 % C, 0.10 to 1.0 % Si, 0.4 to 2.5 % Mn, 0.035 % or less P, 0.035 % or less S and 0.05 to 0.5 % Nb, by weight. This rail has better wear resistance than the actually used pearlitic steel rail and sufficient ductility so that no crack appears due to the thermal dilation and contraction caused by a change of temperature, and is consequently very suitable for the use in a mine railroad.
Mitao Shinji
Yokoyama Hiroyasu
Jfe Steel Corporation
Nkk Corporation
Ridout & Maybee Llp
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