STUDY ON THE CORROSION OF POURING-PIT REFR A CTORIES BY THE MOLTEN STEELS AND SLAGS (II)

Corrosion of chamotte brick by molten steels. Part-2

Abstract

The authors studied on the effects of atmosphere and contacting time on the corrosion of chamotte brick by molten steels in sequence of report 1, and discussed the actual corrosion of runner brick by the molten steel from acid and basic open-hearth furnace. The results obtained. were as follows:
(1) The corrosion of chamotte bricks by the molten steel were influenced by the atmosphere very much, and the oxygen in the air promoted the corrosion.
(2) The oxygen oxidized the molten iron and manganese, and after these oxides diffused into the molten steel they promoted the corrosion. But corrosive ability of iron oxide was larger than that of manganese oxide, especially in case of low manganese content in the-molten steel.
(3) The longer the contacting time, the corrosion of chamotte bricks by molten steel were-the more promoted.
(4) In the actual corrosion of runner brick, by the molten steel from acid and basic open-hearth furnaces the authors demonstrated that the former corrosion was less than the latter, in consideration of the analysis of non-metallic inclusion in the molten steel just before pouring as well as seing from the analysis of floating slag in the mold.