Improvement in plasticity of continuous cast billets through modification of their structure by applying titanium and boron microadditives and controlled surface cooling

摘要

The aim of this paper was to check the possibility of refining the crystallisation structure of continuous cast billets by applying titanium and boron microadditives and additional cooling of solidified cast billet surface. The results of testing the macro- and micro-structure of BW11-steel continuous cast flat billets and St3S-steel square billets showed that the applied modification in the chemical constitution of steel did not affect substantially the billet solidification structure. The structure refinement was obtained on surface layers of the billets that were subject to additional cooling after leaving the secondary cooling zone.