旧话重提、高温渗碳——既节能、又高效、又低成本的工艺

High Temperature Carburizing,A Former Words Anew——Energy Saving,Efficiency and Low Cost Technology

渗碳温度由常规的920℃提高到1050℃可缩短一半以上工艺周期,节能增效显著。道理虽明显,但难于实现的障碍一是缺乏可在950℃以上于渗碳气氛中长期工作的电阻炉;二是担心高温长期保持导致钢晶粒的过分长大。真空(低压)渗碳炉的问世,排除了第一障碍,采用细晶粒钢和二次加热淬火可消除晶粒长大的困扰。在1200℃渗碳气氛中相对稳定的合金和陶瓷电热体的开发,也使在普通电阻炉中实现1050℃的渗碳成为可能。看来普及高温渗碳的时机已经成熟。现在尚须完善的问题是高温碳势传感器和碳势的精确控制。本文就这些问题作一综合评述,供大家参考。

Increasing the carburizing temperature from 920 ℃ to above 1050 ℃may be able to cut at least more a half of process period, So energy saving and efficiency enhancing are markebly. Although the sense is clear, but existed the barriers for realizing it, which first is absent the electric resistance furnace able to serving in earburizing atmosphere for long time above 950 ℃, the second barrier is the peoples worried that the steel grain size will be over growth under high temperature, when the Lowpressure earburizing furnace came out the first barrier was removed and by use of the fine grained steel and heating anew for quenching in order to eliminate the second perplexity of grain over growth. After developing the super heat resistant alloys, with standing earburizing atmosphere and 1200℃ temperature, it make the possibility of earburizing process under 1050℃ by use of the traditional electro-resistance fumase. It seems that the time of spread high temperature earburizing process is up. Now residued problems are the high Temperature carbon senser and the precise carbon potential control, which must solve as quick as possible. This article is summarized to be aimed above mention problems in order to be reference for readers.