7. Conclusions

The 2D differential equation of heat transfer was numerically solved for the derivation of the temperature distribution inside an octagonal billet. The deduced model was applied for the casting case of octagonal billets for an equivalent shape to the size of 250 ˜ 300 mm2 billets that are normally cast at the Stomana billet caster. Furthermore, the simulated octagonal billets were considered to be from the two special grades of 42CrMo4 and S355 J2. Two different iterative methods were applied for the solution of the resulting system of equations, the Gauss-Seidel method and the strongly implicit procedure, both exhibiting satisfactory behavior. A surplus of cooling water especially at the mold may result in a potential productivity increase. Computational results from the simple micro-segregation model were also included in the present study.
