No. 939 is a 2000°F gas-heated box furnace used for preheating metals prior to forging. Workspace dimensions are 72 inches wide x 36 inches deep x 48 inches high. The unit is heated by two modulating natural gas burners of 700,000 BTU capacity with a floor-mounted combustion air blower. The furnace features 7-inch insulated walls made with 5 inches of 2300°F ceramic fiber and 2 inches of 1700°F ceramic fiber. The 7-inch floor comprises 4.5 inches of 2300°F firebrick and 2.5 inches of 1900°F block insulation. The firebrick plate hearth is supported by firebrick piers. The unit has a manually operated vertical-lift door and includes a digital indicating temperature controller, manual reset excess temperature controller with separate contactors and a fused disconnect switch.
I want to hear from you. Tell me how we can improve.
Check out the April 2021 issue of FORGE, featuring our cover story on the "Ovako's Vacuum Degassing Process Improves Forging-Steel Grades", "Back to the Future: Revisiting AM Predictions from 2012", "Viral Marketing during COVID-19", and much more.