Rail having excellent resistance to rolling fatigue damage and r

Details Rail having excellent resistance to rolling fatigue damage and r Rail having excellent resistance to rolling fatigue damage and r

1996-07-29

1998-06-02

Yee, Deborah

Metal treatment

Stock

Ferrous

148334, 148335, 148584, C21D 800

Patent

active

057592993

ABSTRACT:
A high-abrasion bainite rail excellent in resistance to rolling fatigue and failure, consisting essentially of 0.15 to 0.55 wt. % of C, 0.05 to 1.0 wt. % of Si, 0.1 to 2.5 wt. % of Mn, 0.03 wt. % or less of P, 0.03 wt. % or less of S, 0.1 to 3.0 wt. % of Cr, 0.005 to 2.05 wt. % of Mo, and the balance being iron and inevitable impurities. The head portion of the rail has a uniform bainite structure. The Vickers hardness at any position of the head top portion and the head corner portion is 240 to 400 Hv. A rail of high toughness and high wear resistance, consisting essentially of 0.2 to 0.5 wt. % of C, 0.1 to 2.0 wt. % of Si, 1.0 to 3.0 wt. % of Mn, 0.035 wt. % or less of P, 0.035 wt. % or less of S, 0.3 to 4.0 wt. % of Cr, and the balance being iron and inevitable impurities. The rail has a bainite structure, a hardness of greater than 400 Hv at each of a head top portion and a head corner portion thereof, both the head top portion and the head corner portion having a substantially uniform hardness at all sections thereof. The rail having a tensile strength of 1200 MPa or more, and a 2 mm, U-notch Charpy absorbed energy of 30 J or more at +20.degree. C.

REFERENCES:
patent: 4767475 (1988-08-01), Fukuda et al.
patent: 5209792 (1993-05-01), Besch et al.
patent: 5382307 (1995-01-01), Kageyama et al.

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