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Intensity of wear and tear of magnesite-chrome refractories in open-hearth roofs

Research paper by I. I. Nemets, V. A. Makovskiy

Indexed on: 01 Mar '61Published on: 01 Mar '61Published in: Refractories and Industrial Ceramics



Abstract

When magnesite-chrome brick wears out, the temperature gradient through the open-hearth furnace roof is increased; hence the dimensions of the spalling working part of the brick are reduced and the time interval between spalling during the run is increased.The increased wear resistance of dense, high-fired magnesite-chrome roof refractories in service in the roofs of rocking furnaces was due to reduction in the size of the spalling working part and a longer period between spalling as a result of delayed migration of the melts and the associated rate of formation of zones in the brick.It is possible to bring about a considerable reduction in the intensity of the wear and tear in magnesite-chrome roof refractories during service in open hearth furnaces by increasing the temperature gradient (Δt/Δδ) through the thickness of the roof, by intensive cooling of the outer surface of smooth roofs during the first half of the run, and also by using dense magnesite-chrome refractories.