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回火工艺中的脱炭氧化是热处理的严重问题,直接影响淬火质量。普通回火炉无法实现光亮退火、正火,如用真空炉处理,成本则十分昂贵。预抽真空回火炉是近年来发展的新型设备,它是在普通井式回火炉基础上改善了气密性,配置了真空泵,其实质是抽去空气充进保护气氛N_2气进行回火处理。对于光亮退火、正火和保护气氛回火及C—N共渗、软氮化、脱碳后的复碳处理特别适用,也可用于铝、铜等有色合金的处理。
Tempering of carbon removal process is a serious problem of heat treatment, a direct impact on quenching quality. Ordinary back to the furnace can not be bright annealing, normalizing, such as with a vacuum furnace, the cost is very expensive. The pre-evacuated tempering furnace is a new type of equipment developed in recent years. It improves the airtightness on the basis of an ordinary pit furnace, and is equipped with a vacuum pump. The essence is to remove the air and fill the protective atmosphere with N2 gas for tempering. For bright annealing, normalizing and protective atmosphere tempering and C-N co-infiltration, soft nitriding, decarburization after complex carbon treatment is particularly applicable, can also be used for aluminum, copper and other non-ferrous alloys.