ASME SB171 C70600 CuNi 90/10 Forged Ring for Seawater and Marine Systems
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ASME SB171 C70600 CuNi 90/10 Forged Ring for Seawater and Marine Systems
This product is a 90/10 copper-nickel alloy forged ring manufactured in accordance with ASME SB171, with material designation C70600. Composed of 90% copper and 10% nickel, supplemented with minor additions of iron and manganese, it offers excellent resistance to seawater corrosion, biofouling, and exhibits good workability. Produced through a forging process, the ring features a dense microstructure and stable mechanical properties. It is widely used in shipbuilding, marine engineering, seawater desalination systems, petrochemical facilities, and other applications requiring high corrosion resistance, serving as flanges, tube sheets, valve bodies, and structural connection components.
1.Chemical & Mechanical Properties
| ASME SB171 UNS N08810 Chemical Composition (%) | |||||
|
Cu |
Ni incl Cobalt |
Mn |
Pb |
Fe |
Zn |
|
Rem |
9.0~11.0 | ≤1.0 | ≤0.05 | 1.0~1.8 | ≤1.0 |
Mechanical Properties
| Thickness, in. [mm] | Tensile Strength, min, ksi [MPa] | Yield Strength,8 min, ksi [MPa] | Yield Strength 0.2 % Offset, min, ksi [MPa] |
Elongation in 2 in. [50.0 mm], min, % |
| 2.5 [60.0] and under | 40 [275] | 15 [105] | 15 [105] | 30 [30] |
| over 2.5 to 5 [60.0 to 140.0], incl | 40 [275] | 15 [105] | 15 [105] | 30 [30] |
Physical Properties
| Property | US customary | Metric |
| Coefficient of Thermal Expansion | 9.5 × 10⁻⁶ /°F (68-572 ℉) | 17.1 × 10⁻⁶ /°C (20 - 300 °C) |
| Density | 0.323 lb/in3 at 68℉ | 8.94 gm/cm3 at 20℃ |
| Electrical Conductivity | 9 %IACS at 68℉ | 0.053 MegaSiemens/cm at 20℃ |
| Electrical Resistivity | 115.0 ohms-cmil/ft at 68℉ | 19.0-19.12 microhm-cm at 20℃ |
| Melting Point - Liquidus | 2100℉ | 1149 ℃ |
| Melting Point - Solidus | 2010℉ | 1099 ℃ |
| Modulas of Elasticity in Tension | 18000 ksi | 124000 MPa |
| Modulus of Rigidity | 6800 ksi | 46880 MPa |
| Specific Gravity | 8.94 | 8.94 |
| Specific Heat Capacity | 0.09 Btu/(lb·°F) at 68 ℉ | 377 - 380 J/(kg·K) at 20-300℃ |
| Thermal Conductivity | 26.0 Btu/(hr·ft²·°F) at 68 ℉ | 45 W/(m·K) at 20℃ |
2. Key Adventages
- Exceptional resistance to seawater corrosion and erosion-corrosion.
- Natural Anti-biofouling Capability
- Excellent mechanical properties and low-temperature toughness
- Good machinability and weldability
- Stable Stress Corrosion Cracking Resistance
- Over a 20–30 year equipment lifecycle, maintenance and replacement costs are significantly reduced.
3. Key Applications:
C70600 copper-nickel alloy is suitable for use at elevated temperatures and is primarily utilized in the marine industry for the manufacture of condensers, feedwater heaters, and distillation units, as well as in the chemical industry for heat exchangers.
- Marine & Offshore
- Power Plant
- Heat exchanger
- Desalination
- Piping & Flanges
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