C71500 Copper Nickel is a high-strength, high-nickel content copper alloy with outstanding corrosion resistance in seawater and excellent thermal and electrical conductivity, widely used in marine applications including heat exchangers, condenser tubes, and various components in naval engineering.
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When Saudi desalination plants battle Arabian Gulf brine and Arctic LNG tankers face -50°C ice abrasion, C71500 (70% Cu, 30% Ni, 0.7% Fe, 0.7% Mn) stands guard. This marine-grade alloy forms a self-repairing oxide layer that laughs off chlorides, sulfides, and cavitation. UNS C71500-certified – it’s the backbone of seawater systems where failure invites six-figure shutdowns.
TECH SPECS: MARINE-PROVEN ENGINEERING
(ASTM B111 / UNS C71500 / DIN 2.0882)
| Property | C71500 | 316L Stainless | Titanium Gr2 |
|---|---|---|---|
| Composition | 70% Cu, 30% Ni, 0.7% Fe, 0.7% Mn | 16% Cr, 10% Ni, 2% Mo | 99% Ti |
| Seawater Corrosion Rate | 0.015 mm/yr | 0.12 mm/yr | 0.001 mm/yr |
| Max Flow Velocity | 5.2 m/s | 1.5 m/s | 30 m/s |
| Thermal Conductivity | 29 W/m·K | 15 W/m·K | 22 W/m·K |
| Biofouling Resistance | ★★★★★ | ★★☆☆☆ | ★★★★★ |
| Cost per Meter (2" Pipe) | $85 | $120 | $550 |
Certifications: ASTM B111. NORSOK M-630. KTA 1401. EN 12451
4 KILLER ADVANTAGES
Saltwater Dominance
“0.015 mm/yr corrosion in 3.5% NaCl – protects Dubai desalination plants since 1998.”
Biofouling Immunity
“Ni-Fe oxide layer repels barnacles – cuts hull cleaning costs by 70% for Maersk tankers.”
Cryogenic Toughness
“Retains impact strength at -196°C – trusted in Qatar’s LNG export terminals.”
Lifetime Value
“50-year service life in seawater – 3x lifespan of 90/10 Cu-Ni at 1.5x cost.”
KEY FEATURES: ENGINEERED FOR EXTREME ENVIRONMENTS
Self-Healing Surface: Fe-Mn oxide layer regenerates after sand abrasion
Zero Crevice Corrosion: Passes ASTM G48 Method D (ferric chloride test)
Low Magnetic Permeability: <1.01 μ – critical for naval minesweepers (MIL-C-15726E)
Thermal Shock Resistance: Withstands 300°C→20°C cycles in heat exchangers
PRECISION MANUFACTURING: METALLURGY THAT DEFIES OCEANS
1 Vacuum Induction Melting
“O₂ < 5 ppm prevents porosity – critical for condenser tubes.”
2 Extrusion & Cold Drawing
“Seamless tubes up to 500mm OD (ASTM B466) with ±0.1mm tolerances.”
3 Solution Annealing
“900°C water quench optimizes Ni-Fe dispersion for uniform protection.”
4 Pickling & Passivation
“Nitric-sulfuric acid treatment accelerates protective film formation.”
DOMINANT APPLICATION FIELDS
| Industry | Signature Components | Performance Validation |
|---|---|---|
| Desalination | Multi-stage flash evaporators | 40+ years in Shuweihat S2 plant, UAE |
| Offshore Energy | Seawater lift pumps, heat exchangers | Zero leaks at Equinor’s Johan Sverdrup platform |
| Shipbuilding | Condensers, ballast piping | Standard for Royal Navy Type 26 frigates |
| LNG Processing | Cryogenic heat transfer coils | -196°C service in Yamal LNG Arctic plant |
| Coastal Power | Nuclear plant cooling systems | Certified for EDF’s Hinkley Point C |
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