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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 are not needed. These reference radiographs are intended as a basis from which manufacturers and purchasers may, by mutual agreement, select particular discontinuity classes to serve as standards representing minimum levels of acceptability (see Sections and ).
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. Severity levels of similar discontinuity categories and energy level range of reference radiographs may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in the purchaser supplier agreement (see and ).
4.3 Procedures for evaluation of production radiographs using applicable reference radiographs of this standard are prescribed in Section ; 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 addresses purchaser supplier requisites for where weld repairs may be required.
1.1 These reference radiographs illustrate various categories, types, and severity levels of discontinuities occurring in steel castings that have section thicknesses up to 2 in. (50.8 mm) (see ). The reference radiograph films are an adjunct to this standard and must be purchased separately from ASTM International, if needed (see ). Categories and severity levels for each discontinuity type represented by these reference radiographs are described in .
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 , , and of this standard.
Note 2: Reference radiographs previously used for this thickness range carried the designation shrinkage or C categories and by elimination of the crack and hot tear categories except for one example of each of these discontinuity types. Reference radiographs for thicker sections may be found in Reference Radiograph standards and . Reference Radiograph standards E446 and provide some overlap of severity levels for similar discontinuity categories within the same energy level range (see , , and )., but included a now rarely used gamma source, that is, radium. The current document is also updated by inclusion of several recognized
1.2 These film reference radiographs are not intended to illustrate the types and degrees of discontinuities found in steel castings when performing digital radiography. If performing digital radiography of steel castings up to 2 in. (50.8 mm) in thickness, refer to Digital Reference Image Standard .
1.3 These reference radiographs consist of three separate volumes (see ) as follows: (I) medium voltage (nominal 250-kV) X-rays. (II) 1-MV X-rays and Iridium-192 radiation, and (III) 2-MV to 4-MV X-rays and cobalt-60 radiation. Unless otherwise specified in a purchaser supplier agreement (see ), 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 six categories of graded discontinuities of increasing severity level and four 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:
1.3.1 Category A—Gas porosity; severity levels 1 through 5.
1.3.2 Category B—Sand and slag inclusions; severity levels 1 through 5.
1.3.3 Category C—Shrinkage; 4 types:
184.108.40.206 Ca—linear shrinkage—Severity levels 1 through 5.
220.127.116.11 Cb—feathery shrinkage—Severity levels 1 through 5.
18.104.22.168 Cc—sponge shrinkage—Severity levels 1 through 5.
22.214.171.124 Cd—combinations of linear, feathery and sponge shrinkage—Severity levels 1 through 5.
1.3.4 Category D—Crack; 1 illustration.
1.3.5 Category E—Hot tear; 1 illustration.
1.3.6 Category F—Insert; 1 illustration.
1.3.7 Category G—Mottling; 1 illustration.
Note 3: The reference radiographs consist of the following:
Volume I: Medium Voltage (nominal 250 kVp) X-ray Reference Radiographs—set of 34 illustrations (nominal 5 by 7 in.) in a 15 by 17-in. ring binder.
Volume II: 1-MV X-rays and Iridium-192 Reference Radiographs—Set of 34 illustrations (nominal 5 by 7 in.) in a 15 by 17-in. ring binder.
Volume III: 2-MV to 4-MV X-rays and Cobalt-60 Reference Radiographs—Set of 34 illustrations (nominal 5 by 7 in.) in a 15 by 17-in. ring binder.
Note 4: Although Category G–Mottling is listed for all three volumes, the appearance of mottling is dependent on the level of radiation energy. Mottling appears reasonably prominent in Volume I; however, because of the higher radiation energy levels mottling may not be apparent in Volume II nor Volume III.
1.4 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.
1.5 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.
1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
E94 Guide for Radiographic Examination
E186 Reference Radiographs for Heavy-Walled (2 to 412-in. (50.8 to 114-mm)) Steel Castings
E242 Reference Radiographs for Appearances of Radiographic Images as Certain Parameters are Changed
E280 Reference Radiographs for Heavy-Walled (412 to 12-in. (114 to 305-mm)) Steel Castings
E1316 Terminology for Nondestructive Examinations
E2868 Digital Reference Images for Steel Castings up to 2 in. (50.8 mm) in Thickness
ASTM E446-15, Standard Reference Radiographs for Steel Castings Up to 2 in. (50.8 mm) in Thickness, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top