研究了不同Ｃｕ含量的超低碳钢的组织、性能及时效过程，发现在时效过程中，存在有三种类型的析出物造成时效硬化，它们分别为ε－Ｃｕ析出强化，Ｎｂ的碳氮化物以及含Ｃｒ的碳化物强化其中细小的、在位错上形核的ε－Ｃｕ沉淀析出是造成时效硬化效应的主要原因，得出时效激活能为８７．６ ｋＪ／ｍｏｌ．实验结果表明，在相同的时效温度下，随着Ｃｕ含量增加，ε－Ｃｕ时效硬化峰出现的时间缩短，而Ｎｂ的碳氨化物时效硬化峰位基本不变，因此在高Ｃｕ钢中两峰位置分开，而在低Ｃｕ钢中这两个硬化峰重叠。 The microstructure, properties and aging process of ultra-low carbon steel with different Cu contents were studied. It is found that during the aging process, there are three types of precipitates that cause age hardening. They are ε-Cu precipitation strengthening, Nb carbonitrides and Cr-containing carbides strengthen the small, precipitated ε-Cu precipitate on the dislocations, which is the main reason for the age-hardening effect. The results show that the activation energy of aging is 87.6 kJ / mol. The experimental results show that the aging time of ε-Cu decreases with the increase of Cu content, while the peak of carbonitride age hardening of Nb remains unchanged. Therefore, in the high Cu steel, the two peaks The locations are separated, whereas in the low Cu steel the two hardening peaks overlap.