耐腐蚀合金复合材料（CRA）海底管道主要应用于高酸性油气介质的输送。规格通常是管径为168.3~508 mm，壁厚为14.1~31.6 mm，耐腐蚀合金层厚度为3 mm。根据标准DNV-OS-F101（2013）《海底管线系统》要求，全自动超声波检测（AUT）工艺需要经过验证，确保AUT与宏观切片评定的缺陷高度差值小于1 mm。由于CRA复合材料海底管道规格各异，AUT检测工艺也需要进行相应的调整。文章基于管径为508 mm、壁厚为31.6 mm （CRA厚度为3 mm）的管道进行了项目验证，通过AUT试块校准、人工缺陷焊缝制作、缺陷焊缝扫查、宏观切片和数据分析，最终评定出AUT检测工艺的缺陷检出能力和缺陷高度定量精度。有望在耐腐蚀合金复合材料（CRA）海底管道环焊缝检测工作中得到应用。

CRA pipeline was designed for transferring the gas and oil with high acidic. The diameter of the CRA pipeline is from 168.3 mm to 508 mm with its wall thickness being between 14.1 to 31.6mm with 3mm cladding inside the pipe. Based on the requirement of DNV-OS-F101 (2013), a validation test shall be performed to verify that the height-sizing difference between AUT and macro section of the defect shall be within ±1mm. Due to the difference of the dimension of the CRA pipeline, the AUT technique shall need some adjustment. Based on the pipe with the dimension O.D 508 mm, W.T 31.6mm (internal cladding 3 mm), the article describes the details of project validation method, which includes AUT calibration, defective welds manufacturing, scanning, macro sectioning and data analysis, so as to evaluate the detection ability and height sizing accuracy of the AUT technique. It is hopeful that the practical application of the above-mentioned method in the inspection of the girth welds of CRA subsea pipeline shall be realized.