METHOD OF HOMOGENIZING ANNEALING OF BLOOM BEFORE ROLLING ON RAIL Russian patent published in 1997 - IPC

Abstract RU 2082773 C1

FIELD: ferrous metallurgy. SUBSTANCE: objective of invention is increasing resistance of rails against contact damage II._1-2 and transversal fatigue cracks 2I._1-2 under operating conditions by way of decreasing negative effect of primary banding caused by dendrite sweating in ingot. This objective is achieved by optimal homogenizing annealing of stock (blooms) including heating to 1150-1180 C and optimal conditioning (e.g. for 4 h for blooms). Because of diffusion processes between elements of banded structure, probability of appearance of initial longitudinal cracks decreases and so is with contact damages and transversal fatigue cracks, whereas remaining banding opposes to development of transversal fatigue cracks. EFFECT: improved performance characteristics of rails. 1 tbl

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RU 2 082 773 C1

Authors

Karmazin A.I.

Karmazina L.A.

Dates

1997-06-27—Published

1993-05-26—Filed