Infiuence　of　（％MgO）　and　（％T．Fe）　in　slag　for　varlous　temperatures　ranging　from　1550°　to　1800℃　on　wear　rate　of　Al2O3-C　brick　was　studied　in　order　to　apply　to　post　combustion　zone　of　 in-bath　smelting　reduction　furnace． 　It　resulted　that　the　wear　rate　was　more　affected　by　（％T．Fe）　than　（％MgO）　in　slag　at　each　temperature． 　Wear　rate　equation　of　Al2O3-C　brick　was　led　out　to　consider　not　only　elution　of　Al2O3　clinker　into　slag　but　also　oxidation　and　decarburization　of　matrix　under　high　temperature　and　oxidation　atmosphere．

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