High-strength, bainitic steel rail having excellent damage-resis

Details High-strength, bainitic steel rail having excellent damage-resis High-strength, bainitic steel rail having excellent damage-resis

1995-12-19

1997-10-14

Yee, Deborah

Metal treatment

Stock

Ferrous

C22C 3818, C22C 3822, C22C 3824, C22C 3826

Patent

active

056767722

ABSTRACT:
A high-strength bainitic steel rail having an excellent damage resistance property, essentially consists of 0.2 to 0.5 wt % of C, 0.1 to 2.0 wt % of Si, 0.3 to 4.0 wt % of Mn, 0.035 wt % or less of P, 0.035 wt % of S, and 0.3 to 4.0 wt % of Cr, a balance being Fe, and having a micro structure made of a bainitic structure. This rail includes corner and head side portions having a Vickers hardness of Hv420 or higher, and a head top portion having a hardness of Hv420 or higher at a site 20-mm distant from a center of the head top portion in a width direction, wherein the center of the head top portion has such a hardness distribution that a hardness of the center of the head top portion is 10 to 70 lower in Vickers hardness than that of the site 20-mm distant from the center of the head top portion, a hardness of a section between the center of the head top portion and the site 20-mm away from the center in the width direction increases gradually from the center towards an outer side of the width direction, and a difference between an actual hardness of the section, and a hardness obtained by interpolating the hardness of the center of the head top portion and the hardness of the site 20-mm away from the center in the width direction by straight line, is 10 or less in Vickers hardness.

REFERENCES:
patent: 5209792 (1993-05-01), Besch et al.

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