BOF Slag

Name: BOF Slag
Diagram No.: 1147
Type of diagram: TTT
Chemical composition in weight %: See the table
Group: Slag
Note: TTT diagram of the original and modified BOF slags. 5 A, 10 A, and 15 A indicate the 5, 10, and 15 wt% Al2O3 modified BOF slags, respectively. Tn1, Tn2, Tn3, and Tn4 are the nose temperature of original, 5 A, 10 A and 15 A slags. The line is drawn as a guide for reading.
The TTT diagram with respect to the crystallization behaviour of the present slags under isothermal condition is presented in Figure. It is clear that the onset crystallization temperature of the slags is remarkably decreased by adding Al2O3. For a given slag, the incubation time of the crystallization decreases significantly with the isothermal temperature.
According to the measured TTT diagram, the nose temperature (indicated as Tn, at which the incubation time is shortest) was also decreased substantially with Al2O3 addition, i.e. from 1467 C of the original slag to 1150 C of the slag 15 A (the nose temperature decreased by 317 C). The nose temperature can be used to estimate the critical cooling rate (Rc), which is a key parameter to examine the glass formation ability of the slag. Theoretically, when the cooling rate is larger than Rc, no crystal can form during the cooling process. Rc is therefore of fundamental importance to describe the glass formation ability.
Additional links: No. 1144, No. 1145, No. 1146, No. 1147
Reference: Not shown in this demo version.

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