CuAl10Fe5Ni5-C · nickel aluminium bronze
Nickel aluminium bronze (NAB). Steel-level strength with very good corrosion, erosion and cavitation resistance in seawater; the material for seawater valve discs, ship propellers and pump impellers.
- Rp0.2 · MPa
- ≥ 250
- Rm · MPa
- ≥ 600
- TEMPERATURE
- −10 … +230 °C
- COST
Chemical composition
Mechanical properties
| STANDARD · CONDITION | Rp0.2 MPa | Rp1.0 MPa | Rm MPa | A % | KV J |
|---|---|---|---|---|---|
| EN 1982 · sand casting (GS) | 250 | — | ≥ 600 | 13 | 140 HB |
| EN 1982 · continuous casting (GC) | 280 | — | ≥ 650 | 13 | 150 HB |
Minimum values. The last column is Brinell hardness.
Service temperature
Mechanical properties are retained up to 230 °C; above 350 °C is not recommended.
This is the limit of the material itself. A valve's service temperature is usually set by the seal and seat materials; product pages give it for each seal option.
Media suitability GENERAL TREND
Emsal assessment. The final choice is made from corrosion tables, taking concentration, temperature, chloride content and flow velocity into account.
Strengths and weaknesses
Strengths
- The highest strength among copper alloys
- Highly resistant to cavitation and erosion in seawater
- Good in wear and friction
Weaknesses
- Risk of selective corrosion (dealuminification) in stagnant seawater
- Welding and casting require experience
Manufacturing and use
- ECONOMY
- High.
- MANUFACTURING METHODS
- Sand casting · Centrifugal casting · Continuous cast bar
- TYPICAL VALVE PARTS
- Disc · Body (seawater) · Stem · Seat
Used in 4 Emsal products
- 001Wafer check valveBody · Disc
- 005Short pattern swing check valveDisc
- 110Wafer butterfly valveDisc
- 111Lug butterfly valveDisc
Source: EN 1982. Values compiled and verified by Emsal Vana; for binding values, refer to the current edition of the standard and the material certificate.