Continuous Casting Mold Slag

Name: Continuous Casting Mould Slag
Diagram No.: 1128
Type of diagram: CCT, TTT
Chemical composition in weight %: See the table
Group: Slags
Note: CCT diagram was built, Figure 1. The samples were maintained at 1700C during 1 minute before the cooling at different cooling rates. The triangles mean the point of first crystals precipitation. The crystallisation starts far from the liquidus. It can be seen that the crystallisation temperature is a function of the cooling rate. The critical cooling rate is 1700C/min, i.e. with higher cooling rates no crystal is observed.
TTT diagrams were built for the CSTNA slags. The slag samples were maintained at 1600C during 30 s after heating at 1000C/min. At this high temperature the samples are completely melted in a few seconds. It was clearly observed that if the same sample is used to do many determinations at the same temperature the incubation times became longer. The reason for this effect is Na2O loss at high temperatures, assuming that the higher the %Na2O content the higher the crystallisation tendency. To avoid this problem the maximum number of measurements per sample was ten. It can be seen at Figure 2 that Na2O addition shortens intensely the incubation times from the CaO-SiO2-TiO2 slag system (comparing with composition at Table). At Figure 11 it can be seen the TTT diagram of a commercial mould powder normally employed in the continuous casting of stainless steels, whose TTT diagram was also built using SHTT [15]. This commercial mould powder contains CaF2 and Na2O and does not contain TiO2>
Reference: Not shown in this demo version.
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