UNS C70600 (Copper Nickel 90/10) is a 90% copper, 10% nickel alloy with small but critical additions of iron (1.5%) and manganese (1.0%) to enhance overall strength and corrosion resistance. This alloy offers excellent resistance to stress corrosion, erosion, and biofouling in seawater and brackish water, good creep resistance at elevated temperatures, and retention of mechanical properties down to cryogenic temperatures. It is widely used in marine, offshore, chemical, petrochemical, and shipbuilding industries for seawater handling, heat exchangers, and cooling plants .
1. Product Specifications & Physical DataUNS C70600 (Copper Nickel 90/10) is available in multiple mill forms for seawater service components requiring verified corrosion resistance and mechanical properties. Available Forms: Pipe, tube, plate, sheet, bar, forgings, fittings, and hardware . Specifications: ASTM B111, ASTM B151, ASTM B171, ASME SB-111, UNS C70600, EN CW352H .
| Chemical Composition (Weight %) | UNS C70600 Specification |
|---|
| Copper (Cu) | 88.0 min. (Balance) | | Nickel (Ni) | 9.0 - 11.0 | | Iron (Fe) | 1.0 - 1.8 | | Manganese (Mn) | 1.0 max. | | Carbon (C) | 0.05 max. | | Lead (Pb) | 0.05 max. | | Zinc (Zn) | 0.50 max. | | Sulfur (S) | 0.02 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.9 g/cm³ | 0.323 lb/in³ | | Melting Range | 1100 - 1145°C | 2010 - 2090°F | | Modulus of Elasticity | 140 GPa | 20.3 × 10⁶ psi | | Thermal Conductivity (RT) | 45 W/m·K | 312 BTU·in/hr·ft²·°F | | Electrical Resistivity | 0.19 µΩ·m | 0.19 µΩ·m |
| Mechanical Properties (Annealed) | Metric | Imperial |
|---|
| Tensile Strength (min.) | 310 MPa | 45 ksi | | Yield Strength (0.2% offset, min.) | 110 MPa | 16 ksi | | Elongation (min.) | 30% | 30% | | Hardness (Rockwell B) | 60 - 80 | 60 - 80 |
2. Fabrication & Material ComparisonAnnealing: 593-816°C (1100-1500°F) for 15-60 minutes, air cool; relieves cold work stresses . Hot Working: 760-816°C (1550-1750°F); good hot workability . Cold Working: Good cold workability using standard methods; 20% machinability rating . Machining: Machinability rate of 20; requires sharp tools and adequate lubrication . Welding: Excellent weldability using soldering, brazing, oxyacetylene, GTAW, GMAW, SMAW, spot, seam, and butt welding methods .
| Material Comparison | UNS C70600 (90/10) | UNS C71500 (70/30) | 316L Stainless | Aluminum Bronze |
|---|
| Copper Content | 88% min. | 65% min. | — | 80-90% | | Nickel Content | 9-11% | 29-33% | 10-14% | — | | Tensile Strength | 310 MPa | 380 MPa | 485 MPa | 550-650 MPa | | Seawater Biofouling Resistance | Excellent | Excellent | Moderate | Good | | Chloride SCC Resistance | Excellent | Excellent | Poor | Good | | Antimicrobial Properties | Yes (99.9%) | Yes | No | Limited | | Relative Cost | Moderate | Higher | Moderate | Lower | | Primary Use | Seawater piping, heat exchangers | High-velocity seawater | General marine | Propellers, pumps |
3. ApplicationsMarine & Offshore: Seawater piping systems, firewater systems, boat hulls, offshore platform components Power Generation: Heat exchangers, condensers, cooling plants, feedwater heaters Shipbuilding: Seawater cooling systems, bilge and ballast lines, sanitary lines Chemical Processing: Equipment handling seawater, brackish water, and non-oxidizing acids Desalination: Evaporators, heat exchangers, piping for seawater intake Hygienic Environments: Hospital surfaces, kitchen equipment, nursing home fixtures, healthcare touch surfaces Valve & Pump Components: Forged and machined components for seawater service Fittings & Hardware: Marine fittings, hardware, and fasteners requiring corrosion resistance
Contact ZYTC Alloy for certified UNS C70600 (90/10) Copper Nickel Alloy with complete traceability, certificates, and competitive pricing. Available in pipe, tube, plate, sheet, bar, forgings, and fittings for marine, offshore, and seawater service applications. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
