Closure plate, and a sliding closure on the spout of a container containing molten metal

The invention relates to a closure plate for a sliding closure on the spout of a container containing molten metal. Two outer longitudinal faces, a flow opening (21) arranged on a central longitudinal axis (A) of the closure plate (20), and a closing surface (S) extending from said opening are provided. At least two shoulder surfaces (20a, 20b) which are used as clamping surfaces or as centering surfaces of the closure plate (20) are formed on each of the two outer longitudinal faces. The shoulder surfaces have an angle (α, ß) with respect to the longitudinal axis (A), said angle forming a tapered section of the plate. Outer faces (20c; 30c) that adjoin the closing surface (S) side are provided at least next to the shoulder surfaces (20a), each said outer face having a smaller angle (γ) with respect to the longitudinal axis (A) than the angle of the shoulder surfaces (20a).