无损检测. 铁磁金属元件的脉冲涡流检测

[中文适用范围]： 本文件描述了用于测量带有或不带有涂层、绝缘层和表层的铁磁金属构件的脉冲涡流测试技术。适用于碳钢和低合金钢制在-100 °C到500 °C温度范围内的在役构件，壁厚范围为3 mm至65 mm，涂层厚度范围为0 mm至200 mm。测试对象还包括直径不小于50 mm的管道。 本文件所述技术对被测部件的几何形状敏感，将其应用于超出其范围的部件会导致不可预测的精度损失。本文件未涉及裂纹缺陷和由腐蚀引起的局部金属损失的检测。本文件未建立评估准则。评估准则是由各方之间的合同约定明确的。 [外文原描述]： ISO 20669:2017 specifies the pulsed eddy current (PEC) testing technique used to perform thickness measurement on ferromagnetic metallic components with or without the presence of coating, insulation and weather sheeting. ISO 20669:2017 applies to the testing of in-service components made of carbon steel and low-alloy steel in the temperature of −100 °C to 500 °C (temperature measured at metal surface). The range of wall thickness of components is from 3 mm to 65 mm and the range of thickness of coatings is from 0 mm to 200 mm. The tested components also include piping of diameter not less than 50 mm. The technique described in this document is sensitive to the geometry of the component and applying the technique to components outside of its scope will result in unpredictable inaccuracy. This document does not apply to the testing of crack defects and local metal loss caused by pitting. ISO 20669:2017 does not establish evaluation criteria. The evaluation criteria shall be specified by the contractual agreement between parties.