Density changes during hot rolling of cast steel slabs

Abstract

The densities of two commercial continuously cast slabs and two laboratory cast slabs of carbon–manganese steel were measured in the as-cast condition and after hot rolling to various reductions up to 95%. Porosity in the as-cast materials resulted in a wide scatter in density, but in all cases pore closure was complete after <75% reduction in thickness by rolling, and further reduction resulted in no further change in density. The absolute values of density were found to depend slightly on microstructure, but were not affected by rolling temperature if samples were given identical final heat treatments.