|Machinability||By Grinding Only|
For touch-up repairs on forging dies, a localized preheat of 400°F is sufficient with a slow cool. Use AC or DC reverse polarity after grinding or scarfing defective areas for repair applications. Be sure to remove all oxides and other foreign matter from the area before welding. For full impression welds on-die blocks, preheat to 900°F. Maintain temperature during welding. After welding, cool in still air to 300°F to obtain ultimate grain refinement and complete transformation on austenite in weld deposit. Temper at 1050° at one hour per inch on thickness at temperature.