PURPOSE: To prolong the life of a tuyere of a converter when refining is carried out by blowing an oxidizing gas into a part under the surface of a bath in the converter from the inner tube of the tuyere, by increasing the rate of dilution of the oxidizing gas to a specified value when the carbon content of the bath is reduced to a specified value.
CONSTITUTION: Refining is carried out with an oxidizing gas diluted to about 20W40% rate of dilution with one or more kinds of inert gases and/or semi-inert gases in a refining vessel having a tuyere provided with an inner tube for blowing the oxidizing gas into a part under the surface of a bath in the vessel and an outer tube for passing a cooling gas for cooling the inner tube. When the C content of the bath is reduced to 1.0%, preferably <0.6% by the operation, the rate of dilution of the oxidizing gas is increased to 40W80%, and the oxidizing gas diluted to 40W80% is used until refining is finished. Thus, the life of the tuyere is prolonged, and the cost is reduced.
| JPH0920915 | CONVERTER REFINING METHOD |
TAKAGI KEIJI
TERAI RIYOUICHI
HONDA KIYOYUKI
ONO TOMOHITO
| JPS5873732A | 1983-05-04 |