Dual Processes' Normalize and Anneal Temperature Uniformities in Box Furnaces

Direct fired and electrically heated box furnaces are used to normalize and anneal long products.  The two different processing temperatures for annealing and normalizing stainless, or alloy, steel introduce the need to optimize furnace performance at two distinct temperature ranges, both on the high end and low end.  Furnace designs to achieve a benchmark temperature spread are reported.  Considerations such as combustion control, PID tuning, and controls will be discussed.