PURPOSE: To prolong the life of a vessel, by interposing an expansible shapeless refractory layer of which the coefft. of residual linear expansion or contraction at the ordinary sevice temp. and time of the vessel assumes a positive value between a permanent lining brick layer formed on the inside surface of a shell and the inside lining brick layer formed on the inner side thereof.

CONSTITUTION: An expansible shapless refractory layer 8 is interposed between the permanent lining brick layer 2 provided on the inside surface side of a shell 1 of a vessel for molten metal and the inside lining brick layer 3 provided on the inner side thereof. Said layer 8 is formed of shapless refractories of which the rate of residual linear expansion or contraction shows a positive value at the ordinary service temp. of the vessel, that is, about 1,200W1,500°C, and service time, for example, the refractories of the chemical compsn. of, by weight %, about 7.4 Al2O3, about 43.5 SiO2 and about 47 ZrO2.