A refractory castable comprised of: about 45 % to about 75 % by weight high alumina grain; about 2 % to about 35 % by weight silicon carbide; about 1 % to about 8 % by weight carbon; about 1 % to about 8 % by weight calcium aluminate cement; and about 1 % to about 10 % by weight fine magnesium aluminate spinel, the spinel having a grain size of less than about 150 .mu.m (100 Tyler mesh) and being comprised of about 10 % to about 33 % by weight magnesium oxide (MgO) and about 67 % to about 90 % by weight alumina (A12O3).
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