scope:

These reference radiographs² are reproductions of original radiographs and are supplied as a means of establishing the categories and severity levels of discontinuities in steel castings that may be revealed by radiographic examination. They may be used in accordance with contractual specifications.

Radiographs for evaluation are to be compared with these reference radiographs for classification on the basis of the category and severity level of the discontinuity. These reference radiographs are applicable to nominal section thicknesses of 4½ to 12 in. (114 to 305 mm).

These reference radiographs consist of two sets as follows:

Gamma rays (cobalt-60 or an isotope giving comparable quality of radiation).

Ten to 24 MeV X-rays.

Each set is for comparison only with production radiographs produced with equivalent radiations and consists of five categories of discontinuities, in increasing severity levels, as follows:

Category A- Gas porosity; severity levels I through 5,

Category B- Sand and slag inclusions; severity levels I through 5, 5, 5, 5,

Category C- Shrinkage; 3 types:

Type 1 - Severity levels I through

Type 2 - Severity levels through

Type 3 - Severity levels through

Category D-Hot tears and cracks; severity levels 4 and 5,

Category £-Inserts; 2 types:

Type 1 - Severity levels I through 5, and

Type 2 - Severity levels I through 5.

NOTE- The values stated in U.S. customary units are to be regarded as the standard. The metric equivalents of U.S. customary units may be approximate.

²The two sets of reference radiographs consist of 74 radiographic reproductions (37 for each set) 8½ by 11-in. ring binders. These radiographs may be purchased from ASTM Headquarters.