FIELD: ferrous metallurgy. SUBSTANCE: control of erosion of lining is effected by measuring temperature in, at least three points over length of each block of lining in direction of furnace working space. When temperature in each point of block becomes stable in time, subject to determination by extrapolation is temperature of extreme and internal surfaces of block and temperature gradient over its length. Value of erosion of block or growing of scull on it is determined by expression given in the invention description. EFFECT: higher efficiency. 4 dwg
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