ASTM E186-2020 pdf free download

ASTM E186-2020 pdf free download.Standard Reference Radiographs for Heavy-Walled (2 to 4 1 ⁄ 2 in. (50.8 to 114 mm)) Steel Castings
1. Scope
1.1 These reference radiographs 2 illustrate various categories, types, and severity levels of discontinuities occur- ring in steel castings that have section thicknesses of 2 to less than 4 1 ⁄ 2 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 radio- graphs requires a prior purchaser/supplier agreement of radio- graphic 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 Cobalt-60 (called “gamma rays” 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. 1.2.3 Volume III: 4-MV to 30-MV X-rays (called “10 to 24 Mev X-rays” in previous editions)- Set of 28 plates (nomi- nal 5 by 8 in.) in a 15 by 17 in. ring binder. 1.2.4 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 ofgraded 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.
4. 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 purchas- ers may, by mutual agreement, select particular discontinuity 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. 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). 4.3 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 require- ments. 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 to castings may be required.