Method for manufacturing a high strength rail with good toughnes

Details Method for manufacturing a high strength rail with good toughnes Method for manufacturing a high strength rail with good toughnes

1988-10-03

1990-06-12

Roy, Upendra

Metal treatment

Compositions

Heat treating

148146, C21D 904

Patent

active

049330241

ABSTRACT:
A method for manufacturing a high strength rail with good toughness, comprises cooling a rail to Ar.sub.3 transformation point or less after hot rolling; heating said cooled rail at a temperature of an austenite temperature zone ranging from Ac.sub.3 transformation point to 950.degree. C.; and cooling the heated rail. The chemical composition of the rail consists of 0.50 to 0.85 wt. % C, 0.50 to 1.50 wt. % Mn, 0.035 wt. % S or less, 0.10 to 1.00 wt. % Si, 0.035 wt. % P or less, 0.050 wt. % Al or less and the balance of Fe and inevitable impurities.

REFERENCES:
patent: 4040872 (1977-08-01), Mudiare
patent: 4082577 (1978-04-01), Heller
patent: 4486243 (1984-12-01), Lambert et al.
patent: 4749419 (1988-06-01), Sommer et al.

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