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Ocean oil exploitation become more and more important as oil requirement is rapidly increased and reserves in land are reduced. It is well known that pipeline is one of the most important oil transportation tools in ocean oil exploitation. Whether or not it is safe will have a direct influence on the production of petroleum industry. The vibration of pipeline is inevitable due to the action of the wave and the current in sea, resulting in the occurrence of deformation of pipeline. Meanwhile, oil pipeline has often been heated by high temperature oil from heavy oil thermal recovery technologies in ocean oil exploitation. This simply means that the strain aging phenomenon will be caused during the oil transportation. In addition, pipeline steel is also subjected to a natural aging during a long time period at room temperature, resulting in the changes on the microstructure and mechanical properties after long-term service.1,2) Therefore, the pipeline steels are critically required to have not only high strength but also excellent deformability in ocean oil exploitation. Besides the marine environment, to meet the other severe environment such as earthquake, landslide, debris flow, etc, the pipeline steels are also required to have excellent deformability.3) The effects of strain aging on mechanical properties can include the increase of yield strength and yield ratio, and the decrease of toughness and ductility. In view of its engineering significance, strain aging has drawn more and Strain Aging Behavior of Microalloyed Low Carbon Seamless Pipeline Steel