Metal treatment – Compositions – Heat treating
Patent
1985-12-02
1987-12-22
Dean, R.
Metal treatment
Compositions
Heat treating
148134, 148154, C21D 904
Patent
active
047145005
ABSTRACT:
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 austenitization temperature of about 950.degree. to 1050.degree. C. Thereafter 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 s to 650.degree. to 600.degree. 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.degree. 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.degree. to 650.degree. C. and then rapidly cooled by means of water or other appropriate quenching media to a temperature of less than 100.degree. C.
REFERENCES:
patent: 4082577 (1978-04-01), Heller
Flugge Jurgen
Heller Wilhelm
Ratz Gerhard
Dean R.
Krupp Stahl AG
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