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Title:
PACKING MATERIAL FOR SLIDING NOZZLE HOLE AND ITS STRUCTURE
Document Type and Number:
Japanese Patent JPH07116826
Kind Code:
A
Abstract:

PURPOSE: To make handling, such as carrying and inserting into a nozzle hole, convenient and to improve an immediate opening rate by packing silicareous particles into a combustible cylinder and further inserting a rod therein in the state that both ends thereof inscribe closed both ends of this cylinder.

CONSTITUTION: This packing material is made into a two-layered structure and an adequate sintered layer is formed. Chemical components of silica sand 2 are formed of silica sand contg. ≤3wt.% R2O and 97wt.% SiO2 as the main compsn. of the silica sand 6 of the upper layer and having ≤0.5wt.% ≥2mm grain sizes and ≤0.6wt.% ≤0.5mm grain sizes and the lower layer part is formed of the cylindrical packing material 11 so that a molten steel hardly impregnates to the packing material. The silica sand 2 is packed into the combustible cylinder 3 and further, the rod 1 is inserted therein in the form that both ends thereof inscribe both ends 4, 5 of the cylinder. The cylindrical packing material 11 is inserted into the hole of the nozzle 7 to close SN just prior to erecting of a ladle after completion of servicing of the ladle and thereafter, the ladle is erected after SN is closed. The silica sand 6 of the upper layer is thereafter charged by a charging machine.


Inventors:
MIYAMOTO KOICHI
MIYATA KAZUNORI
ONO ISAMU
KAMIIDE MAREYASU
DATE HIRONORI
MURAKAMI TAKAYUKI
Application Number:
JP1993000285541
Publication Date:
May 09, 1995
Filing Date:
October 21, 1993
Export Citation:
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Assignee:
NIPPON STEEL CORP
KUROSAKI REFRACTORIES CO
International Classes:
B22D41/46; B22D11/10; (IPC1-7): B22D41/46; B22D11/10
Attorney, Agent or Firm:
吉島 寧 (外1名)



 
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