Standard Reference Radiographs for Steel Castings Up to 2 in.(50.8 mm) in Thickness

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标准简介

Designation: E446-20 Standard Reference Radiographs for Steel Castings Up to 2 in. (50.8 mm) in Thickness11. Scope1.1 Thesereference radiographs2 illustrate variouscatcgories. types.and severity levels of discontinuitics occur-ring in steel castings that have section thicknesses up to 2 in.[50.8 mm)(see Note 2). The reference radiograph films are anadjunct to this standard and must be purchased separately fromASTM Intcrmational.if nceded (see 2.2). Categorics andseverity levels for each discontinuity type represented by thesereference radiographs are described in 1.3.NoE 1—The basis of applicaion for these reference radiographsattribunes and classification criteriom as described in Sections 4., 6,and 7requires a prior parchaser supplier agreement of madiographic exanminationo this slancard.NOTE 2—Rclcrence radiographs previously used for this thicknessrange caried the designation E7i, but included a now rarely used gammasource,tha is,raditm.The current document is allso updated by inclusionolf several mecognized shrinrkge or C calegories and by elimirssion of thecrack and hot tear categories. except for one example of cach of thesediscontinuiry types Relicrence radiographs for thic

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