Method for pearlitic rail steels

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 9/04 (2006.01) C22C 38/00 (2006.01) C22C 38/12 (2006.01)

Patent

CA 1256004

METHOD FOR PEARLITIC RAIL STEELS ABSTRACT OF THE DISCLOSURE The present invention relates to a method for thermal treatment of pearlitic rail steel. For increasing strength and wear resistance steels with the claimed composition are produced with a fine lamellar pearlite structure by heat treatment. During the first cycle the rail head portion is heated in a sufficient depth of up to 50 mm by means of a burner or an inductive system to an austenitisation temperature of about 950 to 1050°C. There- after the heated head portion is cooled by means of compressed air in such a way that in a first step by blowing a large amount of air the temperature of the rail head portion is cooled within 10 to 20 seconds to 650 to 600°C. before the area of the pearlitic transformation. In a second step with throttled blowing compared to the first step in the area of the pearlitic transformation the rail head portion is cooled within 2 to 4 minutes to about 400°C until finishing the pearlitic transformation. Then the rail head portion is again heated for 4 to 6 minutes to a temperature of about 600 to 650°C and then rapidly cooled by means of water or other appropriate quenching media to a temperature of less than 100 °C .

497233

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