北京电炉厂于七九年十二月二十二日研制成功RRN-60-6型气体软氮化专用炉。该炉采用比较先进的双向可控硅过零开关,P、I、D分段无触点控制装置,在无风扇的情况下,缸内上、中、下温差在5℃以内,缸内温度三点记录,自动记时报警,通入不向气源,即可进行软氮化又可进行高温时效等多种处理; Beijing Electric Furnace Factory successfully developed the RRN-60-6 gas soft nitriding furnace on December 22, 1979. The furnace using more advanced zero-crossing triac zero-crossing switch, P, I, D non-contact section control device, in the absence of fan case, the cylinder temperature in the middle, under 5 ℃, the cylinder temperature Three records, automatic chronograph alarm, access to the gas source can be soft nitriding but also for high temperature aging and other treatment;