Tundish Nozzle Blocked
Reasons of tundish nozzle blocked :
(1) Due to the low temperature, the cold steel blocked the nozzle .Nozzle can be flushed with oxygen, incease the pulling speed for a certain period ,then the cold steel will melt and nozzle can work normally.
(2) Al content in molten steel is high, when Al2O3 oxide is enriched, finnally block the nozzle.
There are some preventive measures :
1 Argon blowing by porous plug
2 Full seal protection casting;
3 Sprayed with SiCa powder or fedding Ca wire;
4 Select the appropriate material nozzle .