我厂在RJJ-60-9T井式气体渗碳炉中对20CrMnTi钢制汽车变速箱齿轮采用两段碳氮共渗工艺,获得较快的共渗速度。根据两台炉子连续生产180炉的统计,平均每炉周期(从工件进炉起至共渗结束出炉淬火为止)6.5小时,可以得到0.85毫米的共渗层(按常规的碳氮共渗工艺,要得到同样的共渗层往往需要7～8小时的周期)。其金相组织、碳氮浓度及其梯度均符合要求。 I plant in RJJ-60-9T well-type gas carburizing furnace on the 20CrMnTi steel automotive gearbox gear with two carbonitriding process, to achieve faster co-permeation rate. According to the statistics of 180 furnaces continuously produced by two furnaces, the average permeation rate of 0.85mm can be obtained by the average of 6.5 hours per furnace cycle (from the workpiece into the furnace until the quench at the end of the infiltration) (according to the conventional carbonitriding process, To get the same common layer often takes 7 to 8 hours of the cycle). Its microstructure, carbon and nitrogen concentration and its gradient are in line with the requirements.