F-free Mold Flux for Casting Medium Carbon Steels

Name: F-free Mold Flux for Casting Medium Carbon Steels
Diagram No.: 985
Type of diagram: CCT
Chemical composition in weight %: See the table
Group: Slags
Note: CCT diagrams of mold slags.
The Continuous Cooling Transformation (CCT) diagrams of benchmark mold flux Sample A and the four designed F-free mold flux Samples are shown in Fig. First, it can be seen from Fig. that the initial crystallization temperature decreased with the increase of cooling rate. It resulted from the rapid increase of viscosity of molten slag due to the addition of cooling rate, which required a lager driving force to initiate the crystallization; therefore, the initial crystallization temperature decreased. Secondly, it can also be found from Fig. 7 that the critical cooling rates of all samples are over 30 K (C)/s. Although the exact values of critical cooling rates could not be obtained as the upper limitation of the facility is 30 K (C)/s, it still suggests that those F-free mold fluxes own strong crystallization ability which satisfies the needs of continuous casting for the medium carbon steels, as these mold fluxes can form crystalline layer quickly in the vicinity of meniscus and achieve mild cooling, which in turn to reduce the thermal stress on the initial solidified shell.
Reference: Not shown in this demo version.

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