Formation of Transverse Surface Cracks During Peritectic Steel Continuous Casting

Resumo

Various mechanisms of transverse crack formation within the surface of continuously-cast billets in the pouring temperature range are analyzed. It is shown that low mechanical properties of peritectic steels in the high-temperature region are due to the high temperature for completion of the δ→γ transformation (T_γ). The effect is considered individually of grain size on metal mechanical properties. Conditions are analyzed for the formation of coarse grains during continuous casting of peritectic steels. It is shown that in the low-temperature region key effects are stress concentration conditions at grain boundaries and intergranular bond forces. On the basis of this analysis, a series of recommendations is proposed for reducing the probability of forming surface cracks in billets.