Abstract
It has been known that crystallization of mold powder is effective on the disturbance of heat transfer between mold and solidified shell in production of middle carbon steel slabs in continuous casting process. But it has not yet been made clear which composition of mold powder is the most suitable for crystallization. The crystallization behavior of Li 2O-SiO 2, Na 2O-SiO 2 and Na 2O-CaO-SiO 2 glasses was observed by differential thermal analysis (DTA) and hot-thermocouple methods with DTA in the present work. As a result, addition of alkaline metal and alkaline earth metal oxides to SiO 2 increased the critical cooling rate for glass formation in binary system of Li 2O-SiO 2 and Na 2O-SiO 2 ,and Li 2O-SiO 2 system crystallized easier than Na 2O-SiO 2 system. In ternary system of Na 2O-CaO-SiO 2, addition of Na 2O hurried the critical cooling rate at CaO/SiO 2 = 0.93 mass ratio, but the rate was almost constant in the composition range of more than 15 mass% Na 2O. The slag of CaO/SiO 2 = 0.93 made the rate faster than the slag of CaO/SiO 2 = 0.47 at constant content of 10mass% Na 2O.
| Original language | English |
|---|---|
| Pages (from-to) | 66-71 |
| Number of pages | 6 |
| Journal | Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan |
| Volume | 84 |
| Issue number | 6 |
| Publication status | Published - 1998 |
Keywords
- Alkaline earth metal silicate
- Alkaline metal silicate
- CCT diagram
- Continuous casting
- Critical cooling rate
- Crystallization
- DTA
- Hot-thermocouple
- Mold powder