remove old lining and relining of furnace ,remove old lining and relining of ladle ,patch repair furnace and ladle spout ,section maintenance and cleaning ,demolition and installation of bricks ,repairing by castable ,head wall demolition and rebuilding ,head wall top repairing ,side wall top repairing ,crossover maintenance ,peep hole cover assemble ,degassing gap cleaning of flue wall ,straightening of flue wall ,ftp hopper cleaning ,ftp slanting duct cleaning ,furnace and underground cleaning ,end headwall repairing ,burner stand repairing ,manual fluewall cleaning ,repairing of thermocouple, zpr, tpr drum