PURPOSE: To cause no local wear and tear of a refractory body in the circumference of a nozzle, by constituting so that the refractory body in the circumference of a gas blow-in nozzle in a molten metal contains alumina and carbon of a specific quantity.

CONSTITUTION: In the circumference of a gas blow-in nozzle (c) in a molten metal, a refractory body which has alumina ≥30wt% (hereinafter all the same) in aggregate and has added 3W40% carbon is placed. For instance, sleeve brick 6 is constituted of 80% alumina and 20% carbon, and in order to cope with spalling and thermal stress cracking, spalling resistance is taken into consideration. Also, tuyere brick 7 is constituted of 85% alumina and 15% carbon, and in order to cope with air bubble moving-back and a high temperature flow, strength is taking into consideration. Also, as for its circumference 9, alumina magnesia compound spinel carbon brick consisting of 56% alumina, 22% magnesia and 13% carbon is used, and in order to cope with contact with a high temperature slag rolled in by an agitating flow, corrosion resistance is taken into consideration.