Abstract: Based on Ueshima’s hexagonal solidification model, a two-phase solute micro-segregation model was established by FDM. The effect of solute elements on the solidification segregation of high strength steel was analyzed. The high temperature physical properties of high strength steel under CC were analyzed by theoretical calculation. The analysis shows that when the C content is lower than the peritectic point, the degree of segregation of P, S, Nb and Ti decreases with the increase of C content. When the C content is higher than the peritectic point, the segregation tendency of elements is opposite. The value of high temperature physical property parameters of niobium containing steel under fixed composition is quantitatively calculated. Since the high physical parameters of different phases of iron are inconsistent, it can be seen that an accurate phase composition is very important for determining the parameters of high temperature physical properties.

Key words: micro-segregation model, segregation ratio, high temperature physical property parameters