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排气是渗碳的准备阶段。工件装炉后进行加热及炉气的置换,以尽可能地减少工件的氧化、脱碳,并为渗碳期准备良好的气氛。因此,排气工艺的合理与否,不仅关系到渗碳周期的长短,甚至将影响到渗碳能否正常地进行。然而在制订渗碳工艺中,往往只注重确定渗碳阶段的工艺参数,而忽视排气阶段的工艺,有时不必要把排气时间规定得很长。从工件装炉起,至工件到达奥氏体化温度为止,称为排气阶段。在升温过程中,工件温度与炉温的温差约为30～50℃。因此,一般当炉温回升到880℃～900℃时,即可结
Exhaust gas is carburizing preparation stage. Furnace after loading furnace heating and gas replacement, in order to minimize the oxidation of the workpiece, decarburization, and prepare a good atmosphere for the carburization. Therefore, the exhaust process is reasonable or not, not only related to the length of the carburizing cycle, and even affect the normal carburizing. However, in the development of carburizing process, often only focus on determining the process parameters of the carburizing stage, while ignoring the stage of the exhaust process, and sometimes unnecessary to set the exhaust time is very long. Load from the workpiece furnace, until the workpiece reaches the austenitization temperature, known as the exhaust phase. In the heating process, the temperature difference between the workpiece and the furnace temperature is about 30 ~ 50 ℃. Therefore, the general when the furnace temperature rose to 880 ℃ ~ 900 ℃, you can end