alumina barrier layer casting

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PROBLEM TO BE SOLVED : To provide a cast product having an alumina barrier layer and excellent in high temperature tensile ductility.SOLUTION : A cast product having an alumina barrier layer is a cast product in which an alumina barrier layer containing AlOis formed on the surface of a cast body. The cast body contains, by mass%, 0.3 to 0.7% C, 0.1% to 1.5% Si, 0.1% to 3% Mn, 15 to 40% Cr, 18 to 55% Ni, 2 to 4% Al, 0.005 to 0.4% of rare earth elements, and 0.5 to 5% W and/or 0.1 to 3% Mo, the balance consisting of 25% or more of Fe and inevitable impurities, wherein 80% or more of the rare earth elements is La.