The hard scale particles will be ground into the head of the vignol rails which can be the initiator of cracks. If this layer is not removed before the train goes into operation it will inevitably cause damage. It covers the entire rail surface and consists of a depth of approximately 0.7 mm. The outer layer, the so-called ‘carbon reduced zone’ is a fine layer of ignition formed during the production process of rail. Process is carried out under controlled conditions.A longer crack-free period after installation.
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