Tundish metering nozzles consist of upper nozzle (stationary nozzle) and lower noozle (exchangeable nozzle).
Upper Nozzle is located within tundish lining and transfer the molten steel to controlling exchangeable nozzle, which determine the steel flow. Upper nozzle incorporates with a ultra high density zirconia insert. The zirconia insert provides excellent erosion resistance and extended casting sequence times.
Lower nozzle (exchangeable) is located within assembly that is fixed to the bottom of tundish. The design of lower nozzle can vary according to the system manufacturer. Zirconia insert can be supplied for in-site assembly into metallic holding blocks where cementing, grinding, size banding and on site drying are required prior to use.
It was manufactured by cast process of fine grain alumina method and press process.
Upper nozzle and lower nozzle are suitable for several nozzle changer systems such as Concast (CNM), Danieli (FNC), Interstop (MNC), Krosaki (OTNC) and Vesuvius (CNY/SYS120).
Tundish Metering Nozzle Product data:
| Zirconia Insert Products | Tundish Nozzle Outer Products | |||||
| LKZN-L | LKZN-M | LKZN-H | LKTN-75 | LKTN-85 | LKTN-90 | |
| Physical properties | ||||||
| Apprent porosity (%) | 11 - 12 | 8 - 10 | 5 - 8 | 20 | 18 | 16 |
| Bulk Density (g/cm3) | 4.9 | 5.2 | 5.3 | 2.6 | 2.8 | 3.0 |
| Chemical Analysis (%) | ||||||
| ZrO₂ + HfO₂ | 94.0 | 95.5 | 96 | - | - | - |
| SiO₂ | 1.1 | 0.23 | 0.5 | 20 | 13 | 8 |
| TiO₂ | 0.2 | 0.2 | 0.1 | 3 | 2.1 | 0.3 |
| Fe₂O₃ | 0.5 | 0.05 | 0.05 | 2.5 | 2.0 | 0.58 |
| Al₂O₃ | 0.4 | 0.42 | 0.1 | > 75 | > 85 | > 90 |
| CaO | 0.2 | 0.15 | 0.15 | 0.2 | 0.1 | 0.2 |
| MgO | 2.5 | 2.4 | 2.4 | 0.2 | 0.1 | 0.06 |
| Na₂O | 0.03 | 0.01 | 0.01 | 0.6 | 0.5 | 0.3 |
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