Tundish Nozzle Blocked


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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.

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(2) Al content in molten  steel is high,  when Al2O3 oxide is enriched, finnally block the nozzle.

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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 .