| 摘要 |
PURPOSE:To collect an excellent sample while preventing the formation of air bubbles without sucking molten steel suddenly by charging nonreactive gas in a tube and evacuating the tube properly. CONSTITUTION:Nonreactive gas which does not react in molten steel, such a dry air, argon, and carbon dioxide is charged in the tube 1 made of heat-resisting silica glass, etc., and the tube 1 is evacuated to 10-500Torr at room temperatures. The tube 1 is put in a paper tube 5 of proper length by charging fireproof mortar in its tip part and one end 2 of its thick part is projected outward. The one terminal 2 of the tube 1 is dipped in molten steel and its thick part is fused and opened. The tube 1 is evacuated to 10-500Torr at room temperatures and the pressure further rises owing to heat from the molten steel. Consequently, while the one terminal 2 is opened, the molten steel is sucked gently into the tube 1 and there is no splash scattered. |
