Standard Digital Reference Images for High-Strength Copper-Base and Nickel-Copper Alloy Castings

Importancia y uso:

4.1 Reference images for high-strength copper-base and nickel-copper 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 discontinuities and corresponding image 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 6 and 7).

4.2 Reference images 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 9 addresses purchaser supplier requisites where weld repairs may be required.

4.3 Procedures for evaluation of production images using applicable reference images 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 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.

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

Alloys

ASTM Specification^A

Aluminum Bronze

B148

Nickel-Aluminum Bronze

B148

Copper-Nickel

B369

Manganese Bronze

B584

 

 

Alloys

Government Specification^A

Manganese-Nickel-Aluminum Bronze

MIL-B-21230A – Alloy No. 2

Nickel-Copper

MIL-B-21230A – Alloy No. 2

(A) See Section 2 for the complete title(s) of these specification(s).

Subcomité:

E07.02

Volúmen:

03.04

Palabras clave:

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