新旧输油管道材料力学性能对比研究

管道在经过长期服役以后，对其整体强度的变化情况进行分析研究是管道研究领域的一个重要课题。管道整体强度的降低涉及到诸多方面原因，其中在内外荷载、环境腐蚀等的共同作用下，其材料的力学性能会发生变化，强度降低是很重要的一个方面。因此对长期服役管道材料进行力学性能研究显得十分迫切。通过对材质均为16Mn，分别截取服役近30年的某管线与尚未投入使用的新管线的管道材料，进行拉伸、冲击、疲劳等试验，比较分析了两种材料的屈服极限、强度极限、冲击韧性等力学性能指标，发现16Mn管道材料力学性能稳定，在经过长期服役后其强度无明显降低。

Experimental Research on Mechanical Properties of Oil Transmission Pipeline Materials after Long-term Service

To study the degradation of the integral strength of pipeline after long - term service is one of the most concerned subjects in the field of pipeline research. In fact, the degradation of the integral strength of pipeline is affected by many factors, among which the strength degradation of pipeline materials by outer and internal loads, corrosive circumstances and so on is one of the most important. Thus, it is necessary to research the mechanical properties of pipeline materials after long - term service. This research performed a series of tension, impact and fatigue tests on 16Mn pipeline materials. The materials were cut from the luning oil transmission pipeline, which has been in service for about thirty years and a brand new pipeline respectively. Comparison of the results of yield stress, strength limit, impact tough- ness and fatigue limit for these two materials, it found that the mechanical properties of 16Mn pipeline material was stable and no distinct strength degradation was detected.