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金属热处理中产生公害最严重的是液体氰化。但是至今尚无代替液体氰化的最好方法。我们经过长期的实验室研究及生产性试验成功地在井式炉内实现无公害快速气体碳氮共滲,现已在某些工厂正式应用,获得了重大技术经济效益。这种工艺适用浅层(<0.4mm),也适用于深层(>1.0mm)碳氮共渗。可适用于普通低碳钢,也适用低碳合金钢。共渗速度根据温度而不同,例如在850℃时20钢进行碳氮共滲时,第一小时的渗速可达到0.4mm,表面碳、氮浓度为碳量可达到0.8%～1.0%,氮量可达到0.2%～0.3%。生产效率比煤油+NH_3工艺约快一倍,比用三乙醇胺工艺的快一倍以上。应用此工艺产品质量稳定,生产效率高,工艺简便,成本低廉,容易掌握。炉内排出气氛中所含有害成分,远远低于国家规定标准。
Metal heat treatment is the most serious pollution of liquid cyanide. But so far there is no best way to replace liquid cyanide. After long-term laboratory research and productive tests, we have successfully implemented the pollution-free rapid gas carbonitriding in a pit furnace and have been formally applied in some factories and significant technical and economic benefits have been obtained. This process is suitable for shallow (<0.4mm), but also for deep (> 1.0mm) carbonitriding. Applicable to ordinary mild steel, but also for low-carbon alloy steel. Percolation rate varies according to temperature. For example, when 20 steel is subjected to carbonitriding at 850 ° C, the first hour permeation rate can reach 0.4 mm, and the surface carbon and nitrogen concentration can reach 0.8% to 1.0% of carbon. The nitrogen The amount can reach 0.2% ~ 0.3%. Production efficiency is about twice as fast as kerosene + NH_3 process, more than double that of triethanolamine process. Application of this product quality and stability, high production efficiency, process is simple, low cost, easy to master. Exhaust atmosphere contains harmful ingredients, far below the national standard.