Method of repairing a plate mould to be used for continuous casting of steel

In a method of repairing a plate mould to be used for continuous casting of steel, in particular steel slabs, of the type including a supporting frame, mould walls defining a rectangular mould cavity and supportd against said supporting frame, said mould walls including narrow- side walls and broad-side walls, each one of said broad-side walls being assembled of a supporting plate and a cooled inner-wall plate, and said narrow-side walls being inserted between said broad-side walls, said inner- wall plate being designed in three parts so as to form partition joints between said three parts extending approximately in the longitudinal direction of said plate mould, the improvement which is characterized in that, after occurrence of wear at said inner-wall plates, each one of said three parts thereof is worked off by a measure corresponding to the greatest extent of wear having occurred on the respective part, so as to become plane, and the innermost part thereof is complemented by equally thick outermost replacement parts so as to form a new inner-wall plate.