Bronze Flanges
C95800 Nickel Aluminum Bronze Flanges
The principal cast nickel-aluminum bronze for sea-water service, valued for strength with strong resistance to corrosion, cavitation and erosion.
Product overview
C95800 flanges are considered for marine and offshore piping. Pressure class, facing and drilling should be stated by drawing or standard and confirmed with the company.
C95800 is the cast nickel-aluminum bronze (NAB) most often associated with marine engineering. Controlled additions of nickel, iron and manganese on an aluminum-bronze base give a combination of strength, toughness and resistance to corrosion and cavitation in sea water that few copper alloys can match.
It is widely used for propellers, pump and valve bodies, seawater piping components and fittings and other parts in sea-water handling. The alloy depends on proper foundry practice and, in many cases, heat treatment to achieve the intended microstructure – so documentation and inspection matter for critical parts.
Material identification
| Item | Detail |
|---|---|
| UNS designation | C95800 |
| Material | Nickel-Aluminum Bronze (Marine Grade) |
| Alloy family | Nickel Aluminum Bronze |
| Alloy type | Cast copper-aluminum-nickel-iron-manganese alloy |
| Product form | Flanges |
| Availability | Listed – sizes, tolerances and stock confirmed per inquiry |
Where it is used
- Sea-water pump and valve bodies
- Marine fittings and pipe components
- Propellers and thruster components (as cast parts)
- Heat-exchanger and offshore hardware
- Heavy-duty bushings and wear parts
Machining and fabrication
Machinable but tough; use rigid setups and appropriate tooling. Welding and repair of NAB follow specific qualified procedures, often with post-weld heat treatment.
Forms and sizes
- Cast or machined flanges to drawing or standard – subject to confirmation
- Blind, slip-on, threaded and similar types – subject to confirmation
- Special-order flanges from wrought stock (e.g. C51000)
Standards, sizes, facings and ratings are confirmed with the company for each inquiry; none are published here. Do not rely on this page for dimensions, tolerances or stock.
What to include in your inquiry
- UNS grade and governing specification
- Dimensions (or drawing) and tolerance class
- Quantity and delivery timing
- Application and operating environment
- Certificate / inspection requirements
Composition reference
| Element | Nominal limit, wt % |
|---|---|
| Copper (Cu) | 79.0 min |
| Aluminum (Al) | 8.5 – 9.5 |
| Iron (Fe) | 3.5 – 4.5 |
| Nickel (Ni, incl. Co) | 4.0 – 5.0 |
| Manganese (Mn) | 0.8 – 1.5 |
| Silicon (Si) | 0.10 max |
| Zinc (Zn) | 0.20 max |
| Lead (Pb) | 0.03 max |
Reference data only – typical or nominal values from published specifications, not a guarantee of supplied material. Confirm against the current edition of the applicable specification, the product form and condition, and the material test certificate. Technical review by the company is required before publication or reliance.
Commonly referenced specifications
- ASTM B148 – aluminum-bronze sand castings
- ASTM B271/B271M – centrifugal castings
- ASTM B505/B505M – continuous castings
- MIL-B-24480 – nickel-aluminum bronze castings (where specified)
Related grades
Frequently asked questions
Is C95800 suitable for all sea-water uses?
It is a well-established sea-water alloy, but suitability depends on fluid velocity, design, microstructure and operating conditions. Confirm for the specific service.
What documentation is relevant?
Chemical analysis, mechanical test reports and third-party inspection are commonly requested. What can be supplied is confirmed with the company.
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