PURPOSE: To prevent the erosion of a pipe with molten iron invaded by passing through joints by presetting a boring brick composed of integrally shaped refractory having a prescribed length at the boring part of through-hole in refractory layer preceding to use a tip using nozzle.
CONSTITUTION: Changing-over of a bottom blowing nozzle in a converter lined with permanent brick layer 14 and work brick layer 16, is executed. Then a boring brick 30 composed of a prescribed length of integrally shaped refractory, which extends to more inside of the converter than the position in the work brick layer 16 corresponding to a possible erosive part of the refractory layer in the through-hole forming part at the tip part thereof and extends to a permanent brick layer 14 side at the back end part along penetrating direction in the through-hole boring part, is preset in the refractory layer preceding to use the tip using nozzle. Beforehand, a guide hole 34 is bored into the boring brick 30 and a soft plugging brick is plugged into there. By this method, a possible occurrence of brick joints at the surrounding port of a pipe for fresh nozzle in the inside of or in the vicinity of the intrafurnace atmosphere can be eliminated.
| JPS5974211 | BOTTOM BLOWING TUYERE OF CONVERTER |
| JPS59129710 | BOTTOM BLOWING TUYERE OF CONVERTER |
NAKANISHI HIROAKI
NISHI MASAAKI
YAMASE OSAMU
