Abstract: A device for swirling, through the bottom of a converter for refining liquid metals, by oxygen lance blowing, consisting of a set of single tube tuyeres, located throughout the entire thickness of the refractory coating of the converter and wearing away with the latter. The tube constituting each of the tuyeres is flattened along the whole consumable length (1b) of the tuyere, the width of the internal cross-section for the passage of the gas in the flattened tube (1b) is, at most, equal to 1.0 mm and, preferably, approximately 0.5 mm, the head (1a) of each of said tubes, generally cylindrical, passes through a steel plate (5) to which it is brazed, and the steel plate (5) constitutes one of the walls of a distribution chamber (6) between the swirling gas tuyeres, supplied with gas through a duct (7), the chamber (6) being fixed by means of the plate (5) to the exterior surface of the sheathing (8) of the converter.