1.1 本标准附件中提供的参考射线照片说明了薄壁钢熔模铸件中出现的各种类型和程度的不连续性。 2. 使用本标准对铸件进行规范或分级需要购买辅助参考射线照片，以说明不连续类型和严重程度。它们旨在提供以下内容: 1.1.1 通过射线照相检查识别薄壁铸钢件不连续性及其类型和程度的指南。 1.1.2 验收标准、规范和图纸中参考的不连续性射线照相示例和术语。 1.2 下面介绍了两个插图类别: 1.2.1 分级- 六种常见的不连续类型，每种类型的严重程度依次为八度。 1.2.2 未分级- 其他不连续类型以及通常不被视为不连续的图案和缺陷的十二个单独插图。 1.3 为高达1英寸的铸件截面绘制了参考射线照片。（25.4 mm）厚。 1.4 本文件可在没有其他适用文件的情况下使用，或适用于买方和制造商之间已达成协议的其他材料厚度。 注1: 用130到250范围内的X射线产生的一组参考射线照片 kVp，由16个板（8）组成 1. / 2. 11之前 在里面（216 x 279） mm））在9 3. / 4. 11之前 1. / 2. 在里面（248×292） mm）环形粘合剂。 1.5 有时，参考射线照片辅助材料的制造工艺可能会有微小变化。这些变化可能包括所用薄膜或加工化学品的变化、硬纸板垫模具或印刷的变化等。 ; 然而，在所有情况下，这些变化均由插图监测小组委员会审查，并根据固定原型图像审查所有参考射线照片，以确保参考射线照片所代表的验收水平没有变化。因此，无论文本标准的生产日期或修订水平如何，附加参考射线照片均适用于本标准。 1.6 这些胶片参考射线照片不是为了说明在进行数字X射线成像时在航空熔模铸件中发现的不连续类型和程度。对这些铸件进行数字X射线成像时，请参阅数字参考图像 E2660 . 1.7 单位- 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。 1.9 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。

1.1 The reference radiographs provided in the adjunct to this standard illustrate various types and degrees of discontinuities occurring in thin-wall steel investment castings. 2 Use of this standard for the specification or grading of castings requires procurement of the adjunct reference radiographs which illustrate the discontinuity types and severity levels. They are intended to provide the following: 1.1.1 A guide enabling recognition of thin-wall steel casting discontinuities and their differentiation both as to type and degree through radiographic examination. 1.1.2 Example radiographic illustrations of discontinuities and a nomenclature for reference in acceptance standards, specifications, and drawings. 1.2 Two illustration categories are covered as follows: 1.2.1 Graded— Six common discontinuity types each illustrated in eight degrees of progressively increasing severity. 1.2.2 Ungraded— Twelve single illustrations of additional discontinuity types and of patterns and imperfections not generally regarded as discontinuities. 1.3 The reference radiographs were developed for casting sections up to 1 in. (25.4 mm) in thickness. 1.4 This document may be used where there is no other applicable document existing or for other material thicknesses for which it is found to be applicable and for which agreement has been reached between the purchaser and manufacturer. Note 1: The set of reference radiographs, produced with X-rays in the range from 130 to 250 kVp, consist of 16 plates (8 1 / 2 by 11 in. (216 by 279 mm)) in a 9 3 / 4 by 11 1 / 2 in. (248 by 292 mm) ring binder. 1.5 From time to time, there may be minor changes to the process for manufacturing of the reference radiograph adjunct materials. These changes could include changes in the films or processing chemicals used, changes in the dies or printing for the cardboard mats, etc.; however, in all cases, these changes are reviewed by the Illustration Monitoring Subcommittee and all reference radiographs are reviewed against a fixed prototype image to ensure that there are no changes to the acceptance level represented by the reference radiographs. Therefore, the adjunct reference radiographs remain valid for use with this standard regardless of the date of production or the revision level of the text standard. 1.6 These film reference radiographs are not intended to illustrate the types and degrees of discontinuities found in aerospace investment castings when performing digital X-ray imaging. When performing digital X-ray imaging of these castings, refer to Digital Reference Images E2660 . 1.7 Units— The values stated in inch-pound units are to be regarded as the 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 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. 1.9 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.