<p>Provided is a lance pipe that can be used economically. The lance pipe (1) introduces a injection gas into molten aluminum, and is characterized in that the tip of a gas introduction pipe (2) is provided with a detachable porous tip section (3) and the material strength of the gas introduction pipe (2) is greater than that of the porous tip section (3) by a factor of 20 to 500. Preferably, the gas introduction pipe (2) and the porous tip section (3) are provided with and joined together with a screwing thread section (4).</p>
