ASTM E186-20 pdf free download.Standard Reference Radiographs for Heavy-Walled Steel Castings.
1 .1 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 4’/2 in. (50.8 to 114 mm). The reference radiograph films are an adjunct to this document and must he 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 radio- graphs 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)
1.2 These reference radiographs consist of three separate volumes as follows:
1.2.1 Volume I: 1-MV X-rays and Iridium-192 (called “1 to 2—Mev X-rays” 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).
1.2.2 Volume II: 2 to 4-MV X-rays and Cohalt-60 (called “gamma rays" in previous editions). This includes cohalt-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.
1.2.3 Volume 111: 4-MV to 30-MV X-rays (called “10 to 24 Mev X-rays” in previous editions)- Set of 28 plates in a 15 by 17 in. ring binder.
1.2.4 Unless otherwise specified in a purchaser supplier agreement (sec 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.ASTM E186 pdf download.