Abstract
To evaluate the mechanical properties of molten slags, the compression test and relaxation test of molten slags have been carried out and the compression stresses of molten slags were measured as a function of temperature (1623 to 1723K), deformation rate (1 μm to 1 mm/min) and slag composition (CaO-SiO2-Al2O3 system). Stress relaxation test was carried out to understand their lubrication properties at the strand during withdrawing steel slabs by the caster. It was found that the compression stress was increased with increase of Al2O3 content. The compression stress was also found to increase with increase of compression rate. For relaxation tests of molten CaO-SiO2-Al2O3 system, the compression did not return to zero, but showed residual compression stress. The stress relaxation behavior of molten slag has been well expressed by using three-parameter solid model.
