当气体氮化在退氮结束后进行冷却时,为了防止炉外空气倒流入炉而使工件表面产生氧化色,一般都通氨降温到低于200℃出炉。我们在氨气管道废气出口处安装截止阀,在退氮结束后,关闭进出口截止阀,保持炉气压力为正压。如果气炉压力减小时,可随时开启进口截止阀。炉温降 When the gas nitriding in the nitrogen after the end of the cooling, in order to prevent the furnace air back into the furnace and the workpiece surface oxidation color, are generally ammonia cooling temperature below 200 ℃ baked. We install the exhaust valve in the ammonia pipeline shut-off valve, after the end of the nitrogen, the import and export shut-off valve to keep the furnace gas pressure is positive pressure. If the gas stove pressure is reduced, the import stop valve can be opened at any time. Furnace temperature drop