| 摘要 |
PROBLEM TO BE SOLVED: To improve service life of an immersion tube by suppressing falling-off of the lower end side of the immersion tube for vacuum-degassing furnace, which is caused by the crack. SOLUTION: The immersion tube 10 is provided with a core metal 2 having a cylindrical shape and a cylinder part 3 covering the inside and the outside of the core metal 2, and since the cylinder part 3 has a wide first chamfer part 5 on the outer periphery at the lower end side, the falling off of the lower end side of the cylinder part 3, which is caused by the crack, is suppressed and so, the utilization period of the immersion tube 10 is improved and the service life of the immersion tube 10 can be made longer. COPYRIGHT: (C)2011,JPO&INPIT |
