| 摘要 |
PURPOSE:To improve the corrosion resistance of a powder line part and to prevent the failure of the nozzle. CONSTITUTION:The compsn. of the internal porous body 1 of the gas blowing type of the alumina graphitic immersion nozzle for continuous casting of a gas blowing type is constituted of <=5wt.% silica, 30 to 90wt.% alumina, 5 to 40wt.% graphite and the compsn. of the powder line part thereof is constituted of 1 to 10wt.% carbon black, 55 to 90wt.% zirconia and 5 to 40wt.% graphite. The annihilation of the zirconia from the powder line 2 is suppressed by the addition of the carbon black, by which the corrosion resistance is improved. |
