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The tensile test has been developed to assess scale adhesion of hot-rolled steel. The tensile testing machine was equipped with the CCD camera to follow the failure of scale during straining. The hot-rolled steel with different silicon content was used to investigate the scale adhesion behavior. The result is shown the mechanical adhesion energy of scale formed on the hot-rolled steel with higher Si contain was 115 J.m-2, higher than the hot-rolled steel with lower Si contain which was 56 J.m-2. This might be due to the presence of oxide containing Si at interface which promoted adhesion, implying that longer time for descaling would be required.

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Defects can be caused by the thermal oxide scale that forms on the surface of steel during the hot rolling process. The oxidation and adhesion of scale on silicon-containing hot-rolled steel were investigated in a flowing 20% O2-N2 gas mixture at 900°C. Scale spallation was observed using a tensile testing machine equipped with a CCD camera. The thickness of the scale was 3.45 μm for the higher silicon steel and 4.86 μm for the lower silicon steel. The oxide scale consists of hematite, magnetite, wustite, and iron. The strain that caused the first spallation was used to calculate the mechanical adhesion energy, which indicated the behaviour of the scale adhesion on a steel substrate. The strain initiation of the first spallation of scale on higher silicon steel was 5.57% which was higher than 4.57% for lower silicon hot-rolled steel. The calculated adhesion energy on the studied steel was shown to be in the range of 281 J.m-2 to 334 J.m-2. It can be noted that the higher amounts of silicon content in hot-rolled steel increased steel-scale interface adherence. This was due to the precipitated silicon oxide near steel-scale interface might be exhibited as a reinforcing phase.