1.1 这些参考射线照片 2. 说明截面厚度为4的钢铸件中出现的各种不连续的类别、类型和严重程度 1. / 2. 至12 在里面（114至305毫米）。参考射线底片是本文件的附件，如有必要，必须从ASTM International单独购买（见 2.2 ). 这些参考射线照片所代表的每种不连续类型的类别和严重程度如所述 1.2 . 注1: 这些参考射线照片的应用基础需要事先获得买方-供应商关于第节所述射线检测属性和分类标准的协议 4. , 6. 和 7. 符合本标准。其他钢铸件厚度的参考射线照片可在参考射线照片标准中找到 E446 和 E186 . 参考射线照片 E186 为相同能级范围内的类似不连续类别提供了一些严重性级别重叠（请参见 4.2 , 5.1 和 6.3 ). 1.2 这些参考射线照片由以下两卷组成 1.2.1 第一卷:2毫伏X射线和钴-60- 这包括钴-60或等效同位素辐射以及2-MV至4-MV的X射线。一套28块板，共8块 1. / 2. 11英寸。（216 x 279） mm）环形粘合剂。 1.2.2 第二卷:4-MV至30-MV X射线- 一套28块板，共8块 1. / 2. 11英寸。（216 x 279 mm）环形粘合剂。 1.2.3 除非买方-供应商协议中另有规定（见 1.1 )，每卷仅用于与辐射能量水平在本标准涵盖的厚度范围内的生产射线照片进行比较。 每卷由三类严重程度不断增加的分级不连续和三类未分级不连续组成。包含未分级不连续性的参考射线照片可作为识别不需要严重程度的特定铸件不连续性类型的指南。以下是本标准辅助参考射线照片的不连续类别、类型和严重程度列表: 1.2.3.1 A类- 气体孔隙度；严重性级别1至5。 1.2.3.2 B类- 砂和夹渣；严重性级别1至5。 1.2.3.3 C类- 收缩三种类型: (1) Ca线性收缩 -严重性级别1到5（在以前的版本中称为类型1）。 (2) Cb羽状收缩 -严重性级别1到5（在以前的版本中称为类型2）。 (3) Cc海绵收缩 -严重性级别1至5（在以前的版本中称为类型3）。 1.2.3.4 D类- 裂纹1972年以前的文件中有一个插图D5。 1.2.3.5 E类- 热撕裂；1972年以前的文件中有一个插图D3。 1.2.3.6 F类- 插入1972年以前的文件中有一个插图EB2。 1.3 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。 1.4 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。 1.5 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。 1.6 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====== 4.1 分级参考射线照片旨在为识别典型制造过程中可能遇到的特定铸件不连续类型和相对严重程度提供指南。包含未分级不连续性的参考射线照片可作为识别不需要严重程度的特定铸件不连续性类型的指南。这些参考射线照片旨在作为制造商和买方根据双方协议选择特定工艺等级作为代表最低可接受水平的标准的基础（见第节） 6. 和 7. ). 4.2 当确定适用于铸造服务应用时，本标准代表的参考射线照片可用于本标准范围外的能级、厚度或两者，如买方-供应商协议中约定。 类似不连续类别的重叠严重程度和 E186 如果在买方-供应商协议中达成一致，也可以使用参考射线照片，具体视铸造服务应用而定（见 5.1 ). 4.3 第节规定了使用本标准适用参考射线照片评估生产射线照片的程序 8. ; 然而，可能存在涉及特定铸造服务应用的制造买方问题，在这些应用中可能需要修改或更改此类要求。如果此类修改可能适用于铸造应用，则所有此类变更应在买方-供应商协议或合同文件中明确规定。 部分 9 解决可能需要补焊的买方供应商要求。

1.1 These reference radiographs 2 illustrate various categories, types, and severity levels of discontinuities occurring in steel castings that have section thicknesses of 4 1 / 2 to 12 in. (114 to 305 mm). The reference radiograph films are an adjunct to this document and must be purchased separately from ASTM International, if needed (see 2.2 ). Categories and severity levels for each discontinuity type represented by these reference radiographs are described in 1.2 . Note 1: The basis of application for these reference radiographs requires a prior purchaser supplier agreement of radiographic examination attributes and classification criterion as described in Sections 4 , 6 , and 7 of this standard. Reference radiographs for other steel casting thicknesses may be found in Reference Radiograph standards E446 and E186 . Reference radiograph E186 provides some overlap of severity levels for similar discontinuity categories within the same energy level range (see 4.2 , 5.1 , and 6.3 ). 1.2 These reference radiographs consist of two separate volumes as follows 1.2.1 Volume I: 2-MV X-rays and Cobalt-60— This includes cobalt-60 or equivalent isotope radiation and from 2-MV up to 4-MV X-rays. Set of 28 plates in 8 1 / 2 by 11 in. (216 by 279 mm) ring binders. 1.2.2 Volume II: 4-MV to 30-MV X-rays— Set of 28 plates in 8 1 / 2 by 11 in. (216 by 279 mm) ring binders. 1.2.3 Unless otherwise specified in a purchaser supplier agreement (see 1.1 ), each volume is for comparison only with production radiographs produced with radiation energy levels within the thickness range covered by this standard. Each volume consists of three categories of graded discontinuities in increasing severity levels, and three categories of ungraded discontinuities. Reference radiographs containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels are not needed. Following is a list of discontinuity categories, types, and severity levels for the adjunct reference radiographs of this standard: 1.2.3.1 Category A— Gas porosity; severity levels 1 through 5. 1.2.3.2 Category B— Sand and slag inclusions; severity levels 1 through 5. 1.2.3.3 Category C— Shrinkage; three types: (1) Ca Linear Shrinkage —Severity levels 1 through 5 (called Type 1 in previous revisions). (2) Cb Feathery Shrinkage —Severity levels 1 through 5 (called Type 2 in previous revisions). (3) Cc Sponge Shrinkage —Severity levels 1 through 5 (called Type 3 in previous revisions). 1.2.3.4 Category D— Crack; one illustration D5 in pre-1972 documents. 1.2.3.5 Category E— Hot tear; one illustration D3 in pre-1972 documents. 1.2.3.6 Category F— Insert; one illustration EB2 in pre-1972 documents. 1.3 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. 1.4 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. 1.5 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. 1.6 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 ====== 4.1 Graded reference radiographs are intended to provide a guide enabling recognition of specific casting discontinuity types and relative severity levels that may be encountered during typical fabrication processes. Reference radiographs containing ungraded discontinuities are provided as a guide for recognition of a specific casting discontinuity type where severity levels may not be needed. These reference radiographs are intended as a basis from which manufacturers and purchasers may, by mutual agreement, select particular workmanship classes to serve as standards representing minimum levels of acceptability (see Sections 6 and 7 ). 4.2 Reference radiographs represented by this standard may be used, as agreed upon in a purchaser supplier agreement, for energy levels, thicknesses, or both, outside the range of this standard when determined applicable for the casting service application. Overlapping severity levels of similar discontinuity categories and energy level range of E186 reference radiographs may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in a purchaser supplier agreement (see 5.1 ). 4.3 Procedures for evaluation of production radiographs using applicable reference radiographs of this standard are prescribed in Section 8 ; however, there may be manufacturing-purchaser issues involving specific casting service applications where it may be appropriate to modify or alter such requirements. Where such modifications may be appropriate for the casting application, all such changes shall be specifically called-out in the purchaser supplier agreement or contractual document. Section 9 addresses purchaser supplier requisites where weld repairs may be required.