scope:

This NES states the requirements for the physical characteristics, test methods and acceptance standards of cast metal nickel aluminium bronze Commercial Alloy ingots and sand castings. (See Clause 1.1 for applicability.)

Submarines

This NES does not cover the use of the castings for first level systems and castings that may come into contact with sea water. (See Clause 1.1.2a.)

NOTE The material covered by this NES suffers from selective phase corrosion in the presence of sea water, particularly if the material has been weld repaired. More expemsive alloys, ie alloys to NES 747 Part 2, NES 747 Part 4 or NES 824 Part 1 are available for use where severe corrosion cannot be tolerated in sea water systems.