Ferralloy, Inc. began shipping an order for 120 furnace roll trunnions, or bell ends as they are sometimes referred to, for a new heat treating furnace ordered by a large international steel producer.The requirement for forgings in this application is somewhat unusual as this component is typically supplied as a sand cast component. For reasons related to the inherent mechanical properties of a forging, we were asked if we could source the billet material in the desired chemistry, forge the trunnions, and rough machine them to the drawing dimensions. We produced the open die forgings, which were then normalized and machined. The forgings will be welded to centrifugally cast tubes and then the entire assembly will be finish machined before field installation in the new furnace.The forgings weigh 70 pounds in the rough machined condition and were produced from a grade of heat resistant alloy steel.
