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Is it possible to heat treat aluminium bronze CW307G (CA104) to improve its corrosion resistance?

Yes, this is covered in Def Stan 02-833. For extruded rods and sections of size 40mm and below, an anneal at 740°C plus or minus 20° followed by air cooling is carried out. This mandatory heat treatment is to eliminate phases which are likely to give rise to selective corrosion in sea water.

With respect to the MOD Defence Standard 02-879 Part 2 Forgings, what do the terms Class 1, Class 2, Class 3 and Class 4 mean?

 

  • Class 1 is a forging whose failure would lead to uncontrollable flooding, the total immobilisation of the vessel or serious harm to personnel.(e.g. First Level systems in submarines).
  • Class 2 is a forging whose failure would lead to severe but controllable flooding, the serious disruption of weapon systems, main propulsion machinery, or its attendant auxillaries, including generators
  • Class 3 is a forging whose failure does not constitute an immediate, significant hazard.
  • Class 4 is a forging which is used for forging stock only.

 

Is Naval Brass CZ112 (1-1.4% tin) still available?

No, the nearest alloy to Naval Brass is a leaded brass CW712R, available in rod, bar and wire. For sheet and plate the UNS Alloy C46400 (0.5 to 1.0% tin ) is used.

With respect to the MOD Defence Standard 02-879 Part 2 Forgings, what do the terms Class 1, Class 2, Class 3 and Class 4 mean?
  • Class 1 is a forging whose failure would lead to uncontrollable flooding, the total immobilisation of the vessel or serious harm to personnel.(e.g. First Level systems in submarines).
  • Class 2 is a forging whose failure would lead to severe but controllable flooding, the serious disruption of weapon systems, main propulsion machinery, or its attendant auxillaries, including generators
  • Class 3 is a forging whose failure does not constitute an immediate, significant hazard.
  • Class 4 is a forging which is used for forging stock only.
Are weld repairs permissible on Class 1 and Class 2 nickel aluminium bronze forgings produced to Def Stan 02-833?

No, the rectification of defects by welding is not permitted on Class 1 and Class 2 (high integrity) forgings.

A drawing specifies TUNGUM for a pipe. What is TUNGUM?

TUNGUM is a trade name for aluminium-nickel-silicon-brass. CW700R (CZ127).

Copper-nickel Alloys, Properties and Applications - Pub 030

Copper nickel properties and applications are provided in this technical publication. Composition and properties of the 90/10 and 70/30 copper-nickel alloys are given, together with examples of their applications. 1982. 40pp. Archive for reseach purposes.

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Copper-nickel 90/10 and 70/30 Alloys, Technical Data - Pub 031

Copper nickel technical data for 90/10 and 70/30 alloys including compositions, physical, mechanical and fabrication properties for these two most commonly encountered copper-nickel alloys. 1982. 32pp. Archive for reseach purposes.

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Copper-nickel Cladding for Offshore Structures- Pub 037

The cost savings available when copper-nickel cladding is used to prevent corrosion and marine organism attachment are significant. This publication details how they can be achieved. 1986. 16pp. Archive for research purposes.

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Materials for Seawater Pipeline Systems - Pub 038

Gives reasons for choice of 90/10 copper-nickel alloy in preference to other materials for many applications. 1986. 16pp. Archive for research purposes.

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Are weld repairs permissible on Class1 and Class 2 Forgings produced to Def Stan 02-879 Part 2?

The rectification of defects by welding is not permitted on Class 1 and Class 2 forgings.

Aluminium-bronze Corrosion Resistance Guide - Pub 080

Survey of published and other information relating to aluminium bronzes in a number of environments. Recommendations are made for materials suitable for many applications. 1981. 30pp. Archive for research purposes.

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