井式回火电炉 well type tempering electric furnace ; vertical pit-type tempering electric furnace
电炉回火
Tempering in an electric furnace
以上为机器翻译结果，长、整句建议使用 人工翻译 。
热处理1949年前，北京已采用电炉、盐溶炉、热电偶等手段进行零件退火、回火、淬火、正火、调质、渗碳等热处理。
Before 1949, Beijing has heat treatment furnace, salt dissolved by thermocouples means furnace, quenching and tempering, parts of annealing, normalizing, quenching and tempering, carburizing and etc.
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