| 摘要 |
<p>PURPOSE:To provide a molten steel discharging refractory product for an electrical furnace having a superior operating characteristic as well as an excellent workability in which some troubles in operation such as a disturbed time of discharging molten steel or a hard cutting of slag and the like can be resolved. CONSTITUTION:Molten steel discharging refractory product A installed at a tap hole of an electrical furnace is formed of an integral molded product having no junction part ranging from a molten steel loading side to a molten steel unloading side. Graphite-magnesia refractory product installing part A-2 is installed at a molten steel loading side surface layer to which at least molten steel is contacted and at an inner hole surface layer. Other portions than the installing part A-2 are constructed by a graphite-alumina refractory product installing part A-1. With such an arrangement, workability and disassembling characteristics are superior without generating any troubles such as an insertion of base metal into a joint part, a poor opening caused by the insertion, and an incapability in operation under the worst condition. In addition graphite-magnesia refractory product having a high anti-slag characteristic is locally arranged and other portions are provided with graphite-alumina refractory product having a high anti-spalling characteristic, resulting in that abrupt occurrence of cracks caused by thermal spalling is scarcely generated.</p> |
