| 摘要 |
In submerged teeming operations the extended pouring tube which receives molten metal from a vessel via a nozzle has gas admitted thereto for protecting it against molten metal attack. A union block is sandwiched between the nozzle and pouring tube, block being surrounded by a metal jacket spaced therefrom to form a gas manifold to be fed with gas via a gas supply pipe. Gas admitted to the manifold is ejected, around the lower end of the union block, by a surrounding annular orifice into the pouring tube and flows downwardly along the wall thereof as a protective gas film. |
