该欧洲标准规定了包含平底孔（FBH）的一系列超声波测试参考块的制造，检查和标记的要求，其定义了在EN标准中参考的指示的缺陷尺寸。 包含定义指定缺陷尺寸的侧钻孔（SDH）的超声波测试参考块的应用应由制造商和购买者协商。 本标准适用于根据EN 4050 1（FBH法）的要求进行超声波检测时使用的主标准试块的生产。 人们认识到，由于曲率范围较大，圆形锻造坯料和钢筋会遇到特殊的困难。对于该应用，仅生产一个块作为主标准测试块和标准测试块

This European Standard specifies the requirements for the manufacture, checking and marking of the series of ultrasonic testing reference blocks containing flat bottom holes (FBH) which define the indicated defect size to which reference is made in EN standards. The application of ultrasonic testing reference blocks containing side drilled holes (SDH) which define an indicated defect size shall be agreed between manufacturer and purchaser. This standard is applicable to the production of master and standard test blocks to be used when carrying out ultrasonic inspection to the requirements of EN 4050 1 (FBH method). It is recognized that particular difficulties are encountered with round forging stock and bars due to the wide range of curvatures. For this application, only one block shall be produced to act as both master and standard test block.