CAST PRODUCT HAVING ALUMINA BARRIER LAYER AND METHOD FOR PRODUCING SAME

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[Problem] To provide a cast product having an alumina barrier layer, and method for manufacturing the same. [Solution] This cast product having an alumina barrier layer is a cast product having an alumina barrier layer containing Al2O3 on the surface of the cast product. The cast product contains, on a weight percent basis, 0.3-0.7% C, 0.1-1.5% Si, 0.1-3% Mn, 15-40% Cr, 20-55% Ni, 2-4% Al, 0.005-0.4% rare earth elements, 0.5-5% W and/or 0.1-3% Mo, with the remaining 25% or more comprising Fe and unavoidable impurities. 80% or more of the rare earth elements is La.