Mold Fluxes for Casting Medium Carbon Steel

Alloy name: Mold Fluxes for Casting Medium Carbon Steel
Diagram No.: 979
Type of diagram: CCT, TTT
Chemical composition in weight %: See the table 1
Group: Slags
Note: Figure 3 shows the CCT diagrams of the mold fluxes with different Na2O content. It could be observed that the crystallization temperatures for all the samples would decrease with the increase of continuous cooling rate, which may be due to the fact that the nucleation and growth rate of crystals are functions of viscosity and the degree of undercooling. Here the Crystallization temperature is defined as the temperature corresponding to the time when 0.5 vol% of crystallization appears during the continuous cooling process. As viscosity increases quickly under the higher cooling rate, it requires stronger driving force to initiate the mold flux nucleation, i.e., a higher degree of undercooling. Therefore, the crystallization temperature would decrease with increasing continuous cooling rate. Meanwhile, the present study shows that Na2O promotes the crystallization of mold flux, and it was clear that the crystallization temperature changed from 1 315C to 1347C, 1353C and 1378C respectively when the Na2O content was added from 4 to 12% at the fixed cooling rate of 1C/s.
The TTT diagrams of mold fluxes with different Na2O content were shown in Fig. 5. In the experiments, the 0.5 vol% of crystallization was defined as the beginning of crystallization, and the 95 vol% of crystallization was defined as the end of crystallization.
Reference: Not shown in this demo version.

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