1.1 本规程涵盖了包含平底孔（FBH）的超声波检查中使用的金属合金参考试块的制造和控制程序。 1.2 这些试块可用于检查超声波检测仪器和搜索装置的性能，以及金属合金产品超声波检测的标准化和控制。 1.3 所述对比试块适用于直接接触法或浸入式脉冲回波超声法。 1.4 描述了平面声音输入的标准集； 基本集、面积振幅集和距离振幅集。 1.5 FBH制造的要求可适用于圆棒/钢坯参考标准和从其他产品形式制造的参考标准。 1.6 本规程未规定参考反射器尺寸或产品拒收极限。它确实描述了制造实践和应用公差。在本惯例与客户规范之间存在任何冲突的情况下，应以客户规范为准。 1.7 以英寸-磅为单位的数值应视为标准值。 括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.8 本规程包含了规程的要求 E428 和指南 E1158 . 在实践中制造的参考标准 E428 和指南 E1158 遵守本规程的要求。 1.9 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.10 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 标准参考试块集 4.1 根据本规程制造的材料将仅在5.5℃的浸入试验中显示比面积振幅和距离振幅关系 使用本规程中描述的搜索单元、测试仪器和测试参数。 在其他频率或与未校准仪器进行的比较测试不一定会给出本实践中所示的相同关系。参见Ref ( 1. ) 5. 对于其他频率和传感器直径的面积振幅限制。另请参见参考 ( 2. ) 关于使用标准试块进行测试标准化的注意事项。 5.2 根据制造的参考标准 4.2 可以利用本文中的制造和验证技术。由于非标准砌块性质多变，细节应在订购文件中商定。

1.1 This practice covers a procedure for fabrication and control of metal alloy reference blocks used in ultrasonic examinations that contain flat bottom holes (FBH). 1.2 These blocks may be used for checking the performance of ultrasonic examination instrumentation and search units and for standardization and control of ultrasonic examination of metal alloy products. 1.3 The reference blocks described are suitable for use with either the direct-contact method or immersion pulse-echo ultrasonic methods. 1.4 Standard sets are described for flat surface sound entry; the Basic set, Area-Amplitude set, and Distance Amplitude set. 1.5 The requirements for FBH fabrication may be applied to round bar/billet reference standards and reference standards fabricated from other product forms. 1.6 This practice does not specify reference reflector sizes or product rejection limits. It does describe fabrication practices and applied tolerances. In all cases of conflict between this practice and customer specifications, the customer specification shall prevail. 1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.8 This practice has incorporated the requirements of Practice E428 and Guide E1158 . Reference standards that were manufactured under Practice E428 and Guide E1158 comply with the requirements of this practice. 1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Standard reference block sets per 4.1 fabricated in accordance with this practice will exhibit specific area-amplitude and distance amplitude relationships only with an immersion test at 5 MHz using the search unit, test instrument, and test parameters described in this practice. Comparison tests at other frequencies or with uncalibrated instruments will not necessarily give the same relationships shown in this practice. See Ref ( 1 ) 5 for area-amplitude limitations at other frequencies and transducer diameters. Also see Ref ( 2 ) for cautions regarding use of standard blocks for test standardizations. 5.2 Reference standards fabricated per 4.2 may utilize the fabrication and verification techniques herein. Due to the variable nature of non-standard blocks, the details should be agreed upon in the ordering documents.