Metal mass for heat treatment furnace, repair method of the metal mass for heat treatment furnace, and method of manufacturing the hearth filling material used in the metal mass for heat treatment furnace

摘要

Has a packed bed of granular refractory in the furnace operation side, the filling factor of the particulate refractory is 100% by volume of less than 65% by volume or more, the present invention, the maximum of the particulate refractory thickness of the packed bed to provide a metal mass for heat treatment furnace with a hearth structure is more than twice the particle size.