Standard Reference Radiographs for Tin Bronze Castings

Importancia y uso:

4.1 Personnel utilizing reference radiographs to this standard shall be qualified 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. Personnel shall be authorized to perform radiographic interpretation by the employer. 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).

4.2 Reference radiographs for tin bronze and related alloy castings are intended to be used as a guide to the recognition of common discontinuities and their differentiation both as to type and severity level. Discontinuity types most common to these alloys are illustrated. For reference, descriptions of typical casting defects and corresponding radiographic indication types are contained in Section 5. Purchasers and suppliers may, by mutual agreement, select particular discontinuity categories (see 1.2) to serve as standards representing minimum levels of acceptability (see Sections 7 and 8).

4.3 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. Section 10 addresses purchaser supplier requisites where weld repairs may be required.

4.4 Procedures for evaluation of production radiographs using applicable reference radiographs of this standard are prescribed in Section 9; however, there may be manufacturing-purchaser issues involving specific casting service applications where it may be appropriate to modify or alter such requirements. Where such modifications may be appropriate for the casting application, all such changes shall be called-out in the purchaser supplier agreement or contractual document.

4.5 The following ASTM specifications illustrate alloys covered by these standards; however, it is intended that these reference radiographs also apply to related government and commercial material specifications:

Valve bronze castings

B61^A

Composition bronze or ounce metal castings

B62^B

Tin bronze sand castings

B584

Leaded red brass sand castings

B584

Copper-base alloy centrifugal castings (as applicable)

B271

(A) Similar to MIL-B-16541.(B) Similar to MIL-B-16444.

Subcomité:

E07.02

Referida por:

E1030_E1030M-21, E1030_E1030M-21, E3185-21

Volúmen:

03.03

Número ICS:

77.040.20 (Non-destructive testing of metals), 77.150.60 (Lead, zinc and tin products)

Palabras clave:

brass; casting discontinuities; copper; gamma ray; reference radiographs; tin bronze; valve bronze; X-ray;