9th ECCC European Continuous Casting Conference – ECCC 2017

Mold slag plays a very important role in continuous casting process. However, the understanding on the real behavior of the mold slag film in-between the steel shell and Cu mold is still not very clear in terms of controlling heat transfer and lubrication. The reason is the complexity of the slag film history along the mold and its coupling effect with the temperature and time. In this...

At voestapine Stahl Linz two different mold powders are used for casting construction steel, where powder A forms significant larger slag rims than powder B. Their chemical compositions are very similar. The CaO/SiO2 ratio for powder A and B is 1.25 and 1.20 respectively. Additionally powder B contains 0.97 wt% MnO. For the clarification of this difference in performance the melting behavior...

Fluorine is a crucial component in mould fluxes with a concentration that may reach and in some cases exceed 10% in weight. Fluorine works primarily as a fluxer and chain breaker, its effects include lowering of surface tension, lowering of melting temperature and lowering of viscosity. However serious drawbacks come from use of raw materials containing this element, such as enhanced corrosion...

High-Al steels attract wide attention in the automobile industry owing to their excellent combination of high strength and superior formability. The reaction between Al in the liquid steel and SiO2 in lime-silica-based mould fluxes during the continuous casting of these steels causes chemical compositional changes in the mould flux, subsequently affecting the surface quality of slabs. In order...

Keywords: mould powder, fluoride free, heat transfer Abstract: When casting steel grades in the peritectic range it is critical to control the heat transfer from the steel shell in order to minimise longitudinal crack defects. In practice, horizontal heat flux is predominantly controlled by mould flux crystallinity. Cuspidine (3CaO.2SiO2.CaF2) is seen as the most preferable crystal phase...