FIELD: laying of charging and gas discharge hatches of different heating units. SUBSTANCE: refractory wedge-shaped product has side surface with vertical facets 2,3,4,5. Facet 5 is formed as part of cylindrical surface. Wedge has two horizontal facets 6, each formed as polygon with acute angle of wedge apex and arc described from apex of acute angle and having radius equal to that of hatch opening. Polygon is formed as equilateral triangle with apex angle of 38-52 deg and height not exceeding 5 deg of hatch opening. Improved configuration of refractory products provides for wedge engagement of products in hatch masonry and respectively increased strength and gas tightness of charging hatch masonry zones of coke blast furnaces. EFFECT: increased efficiency, improved strength and gastightness of hatch masonry and reduced production costs by reduced number of grades of refractory products used in laying of charging hatch masonries. 3 dwg
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