ASTM International - ASTM E186-20
Standard Reference Radiographs for Heavy-Walled (2 to 4 1 2 in. (50.8 to 114 mm)) Steel Castings
|Publication Date:||1 June 2020|
|ICS Code (Non-destructive testing of metals):||77.040.20|
|ICS Code (Iron and steel castings):||77.140.80|
significance And Use:
4.1Â 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... View More
4.1Â 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 discontinuity classes to serve as standards representing minimum levels of acceptability (see Sections 6 and 7).
4.2Â 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 E446 or E280 reference radiographs may alternatively be used, as determined appropriate for the casting service application, if so agreed upon in a purchaser supplier agreement (see Section 1 and 5.1).
4.3Â Procedures for evaluation of production radiographs using applicable reference radiographs of this standard are prescribed in Section 8; however, there may be manufacturing-purcha
4.4Â Personnel utilizing reference radiographs to this standard shall be qualified and authorized to perform radiographic interpretation in accordance with a nationally or internationally recognized NDT personnel qualification practice or standard such as ANSI/ASNT-CP-189, SNT-TC-1A, NAS 410, ISO 9712, or a similar document and certified by the employer or certifying agency, as applicable. The practice or standard used and its applicable revision shall be identified in the contractual agreement between the using parties. A certified Level III shall be available to assist with interpreting specifications and product requirements as applied to the reference radiographs (if the Level III is the radiographic interpreter, this may be the same person).View Less
1.1Â These reference radiographs2 illustrate various categories, types, and severity levels of discontinuities occurring in steel castings that have section thicknesses of 2 to less than 41/2Â in. (50.8 to 114 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 that 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 E280. Reference Radiograph standards E446 and E280 provide some overlap of severity levels for similar discontinuity categories within the same energy level range (see 4.2, 5.1, and 6.3)
1.2Â These reference radiographs consist of three separate volumes as follows:
1.2.1Â Volume I: 1-MV X-rays and Iridium-192 (called â€œ1 to 2â€"Mev X-raysâ€ in previous editions)-Set of 28 plates (nominal 5 by 8 in. (127 by 203 mm) in a 15 by 17 in. (381 by 432 mm) ring binder).
1.2.2Â Volume II: 2 to 4-MV X-rays and Cobalt-60 (called â€œgamma raysâ€ in previous editions). This includes cobalt-60 or equivalent isotope radiation and from 2-MV up to 4-MV X-rays- Set of 28 plates (nominal 5 by 8 in.) in a 15 by 17 in. ring binder.
1.2.3Â Volume III: 4-MV to 30-MV X-rays (called â€œ10 to 24â€‰Mev X-raysâ€ in previous editions)- Set of 28 plates (nominal 5 by 8 in.) in a 15 by 17 in. ring binder.
1.2.4Â 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:
126.96.36.199Â Category Aâ€"Gas porosity; severity levels 1 through 5.
188.8.131.52Â Category Bâ€"Sand and slag inclusions; severity levels 1 through 5.
184.108.40.206Â Category Câ€"Shrinkage; three types:
(1)Â Caâ€"linear shrinkageâ€"severity
(2)Â Cbâ€"feathery shrinkageâ€"Severity
(3)Â Ccâ€"sponge shrinkageâ€"Severity
220.127.116.11Â Category Dâ€"Crack; one illustration (D3 in pre-1972 documents).
18.104.22.168Â Category Eâ€"Hot tear; one illustration in pre-1972 documents.
22.214.171.124Â Category Fâ€"Insert; one illustration (EB3 in pre-1972 documents).
1.3Â 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.
1.4Â 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.
1.5Â These film reference radiographs are not intended to illustrate the types and degrees of discontinuities in steel castings when performing digital X-ray imaging. When performing digital X-ray imaging of these castings, refer to Digital Reference Images E3030.
1.6Â 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.
1.7Â 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.