Increased Life for Open-Hearth Furnace Roof Lining

Reasons are studied for the short life of sprung-suspended roofs of open-hearth furnaces and refractory objects are developed with reduced thermal conductivity and a special hook. During refractory laying a shrinkage-free high-temperature laying mortar is used. OAO Nizhnyi Tagil' Metallurgical Combine organizes industrial output of the refractories developed. Industrial testing is carried out in open-hearth furnace arched roofs of OAO Nizhnyi Tagil' Metallurgical Combine (NTMK) and ZAO Nizhnyi Sergi Metalware and Metallurgical Plant (NMMZ). According to test results the increase in roof life is 20 - 30%, and the economic effect for two open-hearth furnaces is 4,656 million rubles per year. © 2013 Springer Science+Business Media New York.