First of all, the roughness, damage and peeling of the film are the direct causes of oxide scale defects on the surface of hot-rolled strip steel.

Secondly, the secondary iron oxide scale is relatively thin, so the interface stress between the steel plate and the scale layer is small, and the peel ability is poor. If the high-pressure water injection cannot completely remove the remaining secondary iron oxide scale during the finishing rolling process, defects in which the iron oxide scale is pressed into the surface will appear.

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