This paper represents an extended abstract of a study presented at the ESTAD 2019 conference. In this contribution, the influence of different cooling strategies on the formation of intergranular surface cracks is observed with in-situ bending experiments under continuous casting conditions. The steel composition is equal to a 0.17 wt.% C construction steel. It is investigated with and without Al deoxidation at bending temperatures of 1100°C to 700°C. The results show the most critical situation prevailed for each testing condition at 900°C. A holding temperature of 1200°C leads to a selective grain boundary oxidation and therefore to the formation of notches at the austenite grain boundaries, which are the cause for stress concentrations and easier formation of cracks during a subsequent tensile deformation at critical temperatures. The experiments reveal a partially stronger influence of this phenomenon on the steel without Al deoxidation.

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-Driven by obvious advantages of the vertical casting process for very special steel grades there is a new trend to use vertical casting even for heavy bloom round sections. Compared with ingot casting routes, this technology reaches 12.5% more yield. Thus an additional share of the today's ingot casting route can be shifted to the more cost effective continuous casting line.