Optimization Of Design And Materials Of The Steel Tube Furnace New Furnace Roller

It is a general problem of poor surface quality of steel pipe resulted from adhesion of deciduous ferric oxide chips on surfaces between seamless steel bloom and conveyer roller in mill furnace. Structural design and selecting materials was investigated in present paper, which was need by an improvement project of HengSteel Co. Ltd..A model of mechanical behavior of sheet was employed to analyze cool of the molten ferric oxide, it revealed that steel-adhesion occurred until the surface of the conveyer roller was heated up to temperature at 860°C. In this view, a new type of roller with inner surface cooled by water and the area of outflow tube being larger than that of inflow was designed.Results of analytical models showed that the structures and cooling types of rollers were very important factors for steel-adhesion. Although the results of analytical models and finite element method showed that the maximum thermal stresses were more than 1200MPa, failure breaking of the roller did not occurred, which was contributed from thermal stress relaxation after that cracks occurred on the inner surface of the roller.Relationships of wearing capacity - temperature and thermal stress, and that of thermal conductivity- temperature and wearing capacity for the conveyer rollers have been established in order to optimize parameters of structures and, select new materials.Basement of all the above, the new type conveyer roller made of heat-resistant steel including Cr, Ni and Whas been successfully used in application.