| 摘要 |
The nozzle, consisting of a refractory tube, is characterised in that an annular chamber (6) delimited by two coaxial walls (7, 8) is arranged inside the tube and is filled with a neutral gas forming a gaseous screen between the two walls so as to prevent penetration of the nozzle (5) by atmospheric oxygen and therefore any formation of oxide inclusions in the liquid metal flowing in the nozzle. <IMAGE>
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