Hot rolling wide steel strip in finishing train of rolling mill - to avoid bulges or tert. scale rolled into the strip

摘要

After the surface of the work rolls has reached a previously determined and critical surface roughness (Rt) for rolled strip of a prescribed thickness (d), the average resistance to deformation (kwm) of the strip is increased, esp. by reducing the final thickness (d) of the strip, partic. in the first rolling mill stand in the finishing train. Alternatively, when the critical value (Rt) is reached, the steel strip can be replaced by another steel strip which has a higher value (kwm). The amt. of steel scrap contg. longitudinal bulges and/or rolled-in tert. scale, is reduced.