| 摘要 |
PURPOSE:To improve the quality of an ingot by forming nozzle holes to the peripheral face of a cylindrical bottomed nozzle and disposing discharge guiding members in the holes. CONSTITUTION:A tundish 3 is disposed to a water-cooled casting mold 1 and the immersion nozzle 6 is installed to the bottom thereof. The nozzle 6 has a cylindrical bottomed nozzle body 7, two pieces of the nozzle holes 8 and the discharge guiding members 9. Flow regulating plates 11 are disposed in the members 9. A molten steel poured into a casting mold 1 is guided and discharged by the members 9 and, therefore, the regular convection of the molten steel in the mold 1 is obtd. and the range where the convection reaches is shallowed. The temp. difference between the surface and central part of a solidified shell is thereby decreased and the generation of bulging, central segregation, porosity, and internal crazing is prevented. The plates 11 rotate the molten steel around the axial center of the members 9 to intensity the lateral spread of the molten steel and to prevent the generation of the defects. The quality of the ingot is thus improved. |
