In the steel continuous-casting production process, the quality and performance of Tundish nozzle and Tundish nozzle seating brick directly determine the continuity of continuous-casting production and the quality of steel billets. They even affect the productivity and cost control of the whole steel-making production line. So what are their differences?
Different Core Definitions
Tundish nozzle serves as the direct passage for molten steel flowing from the tundish into the mould, equivalent to the "water tap" for continuous-casting production. It directly controls the outflow velocity, flow rate and flow pattern of molten steel. It works under extremely harsh conditions: enduring long term scouring and corrosion by molten steel above 1500 °C, oxidation from contact between molten steel and air, as well as thermal shock caused by sharp temperature fluctuations. Hence, it demands material properties of high-temperature resistance, scouring resistance and thermal-shock resistance.
Tundish nozzle seating brick is embedded at the bottom of the tundish. It is the key component for fixing and supporting the passage component. Meanwhile, it protects the tundish lining and prevents molten-steel leakage. Though not in direct contact with molten steel, it has to withstand high temperature and mechanical pressure transferred from the passage component, as well as indirect corrosion from molten-steel penetration. Therefore, it also requires satisfactory high-temperature resistance, high mechanical strength and penetration resistance.
Different Core Functions
1. For the Tundish nozzle, it enables precise flow control to prevent molten-steel splashing caused by excessive flow or excessively low mould liquid level due to insufficient flow, ensuring continuity of continuous-casting production.Meanwhile, it purifies molten steel, prevents re-oxidation of molten steel, and reduces billet defects such as inclusions and blowholes.
2.For the Tundish nozzle seating brick, it provides fixing and supporting performance: it keeps the passage component free from offset and loosening under high-temperature and high-pressure conditions, avoiding unstable molten‑steel flow and leakage induced by shaking so as to guarantee production safety.It also prevents leakage of high-temperature molten steel to avoid scalding of equipment and personnel, while cutting molten-steel loss and lowering production costs.
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