The influence of slab surface temperature on the descalability of fayalite in a hot strip mill

Silicon is a cost-effective alloying element added to low carbon steel for improved strength, while maintaining ductility and formability. During hot rolling Si-alloyed steel forms uneven patches of red oxide scale over the surface. These patches are difficult to remove by industrial pickling processes. The influence of slab surface temperature on the descalability of fayalite was investigated. When hydraulic descaling is executed at a slab surface temperature higher than the melting point of fayalite (1177°C), the liquid fayalite is washed away. The red oxide scale coverage of the surface was decreased significantly.