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目前针对含体积型缺陷管道剩余强度评价标准和方法主要是基于 X70 及其以下低钢级管线钢，而 X80 及以上高钢级的验证性实验很少。为验证剩余强度评估方法在 X80 管线钢的适用性，首先对比了不同管线钢管体缺陷的极限载荷评估模型及适用范围；其次通过制备不同类型不同尺寸缺陷的 X80 管线钢管水压实验，对各种评估模型在 X80 管线钢管上的适用性进行评价。结果表明：长矩形缺陷的承载能力通常在各类缺陷中最低，而且不同缺陷预测模型的安全程度各不相同；对于矩形缺陷，DNV 模型的预测结果与实验值偏差较小，ASME B31G Modified、RSTRENG 和 C-FER 模型的计算结果偏于安全；对于沟槽缺陷，C-FER 和 PDAM 模型是适用的；对于凹坑+沟槽缺陷，PDAM 模型也可用于 X80 管线钢。
At present, the evaluation criteria and methods for the residual strength of pipelines with volumetric defects are mainly based on X70 and below low-grade pipeline steel, while the verification experiments of X80 and above high grade steel are few. In order to verify the applicability of the residual strength evaluation method to X80 pipeline steel, firstly, the ultimate load assessment model and the applicable scope of the pipeline defects of different pipeline steel were compared. Secondly, by preparing the X80 pipeline steel tube with different types of different size defects, Evaluate the suitability of the model on X80 pipeline steel pipe. The results show that the bearing capacity of long rectangular defects is usually the lowest among all kinds of defects, and the safety of different defect prediction models are different. For rectangular defects, the prediction results of DNV model have little deviation from the experimental ones. ASME B31G Modified, RSTRENG The C-FER and PDAM models are suitable for trench defects and PDAM models for pits + trench defects.