C70600 90/10 Copper-Nickel
UNS C70600 Cupronickel
C70600 is a 90/10 copper-nickel alloy (90% Cu, 10% Ni) recognized as the global standard for marine seawater service. Small additions of iron and manganese provide enhanced corrosion resistance and erosion resistance under flowing seawater conditions, while the alloy’s natural copper content provides strong resistance to biofouling and microbiologically induced corrosion (MIC).
C70600 is the dominant choice for seawater piping, condenser tubing, and offshore platform service. It performs reliably across a broad temperature and flow range and is well established in naval, commercial marine, and power generation applications.
The alloy offers excellent fabrication characteristics and long service life, and is widely supported by mature specifications and supply chains worldwide.
Common Names & Cross-References
Designation | Value |
|---|---|
Common Names | 90/10 Cupronickel, 90/10 Cu-Ni, CuNi 90/10, Copper Nickel 706 |
UNS | C70600 |
CDA | 706 |
German (W.Nr.) | 2.0872 — CuNi10Fe1Mn |
British Standard | BS 2871 CN102 |
EN (Europe) | CW352H — CuNi10Fe1Mn |
MIL/Defense | MIL-T-16420, MIL-C-15726, MIL-T-15005 |
C70600 Chemical Composition
Element | Composition (%) |
|---|---|
Copper (Cu) | Balance |
Nickel (Ni) | 9.0 – 11.0 |
Iron (Fe) | 1.0 – 1.8 |
Manganese (Mn) | 0.2 – 1.0 |
Zinc (Zn) | 1.0 max |
Lead (Pb) | 0.02 max |
Sulfur (S) | 0.02 max |
Carbon (C) | 0.05 max |
Typical Mechanical Properties (Annealed)
Property | Typical | Spec Min |
|---|---|---|
Tensile Strength | 44 ksi (303 MPa) | 38 ksi |
Yield Strength (0.2%) | 16 ksi (110 MPa) | 13 ksi |
Elongation (in 2 in.) | 42% | 35% |
Hardness | Rockwell F 65 (B 28) | — |
Key Features & Advantages
- Outstanding resistance to seawater corrosion and erosion-corrosion
- Strong inherent resistance to biofouling and microbiologically induced corrosion (MIC)
- Excellent resistance to chloride stress corrosion cracking
- Good strength and ductility across a wide temperature range
- Excellent fabrication and forming characteristics
- Long, proven track record in naval, commercial marine, and power generation
- Antimicrobial properties — used in hygiene-sensitive applications
Common Applications of C70600
- Condenser and heat exchanger tubing
- Seawater piping systems and fittings
- Offshore platform service piping and components
- Marine and shipboard service systems
- Desalination plant tubing and components
- Industrial cooling water systems
- Subsea pipelines and submarine hardware
Primary Markets Served
- Marine & Offshore
- Power Generation
- Defense & Naval
- Desalination & Water Treatment
When to Specify C70600
- C70600 vs. C71500 (70/30 Cu-Ni) — 70/30 has higher strength and slightly better high-velocity seawater performance. 90/10 is more economical and is the global default for general marine service.
- C70600 vs. 316L stainless — 90/10 Cu-Ni dramatically outperforms 316L in seawater service due to MIC resistance and lower biofouling. 316L is preferred for cleaner, lower-chloride water.
- C70600 vs. titanium — Titanium is the gold standard for severe seawater but at significantly higher cost. 90/10 Cu-Ni is preferred for general service where titanium is overkill.
- C70600 vs. duplex stainless — Duplex has higher strength but significantly worse biofouling and MIC performance in seawater. 90/10 is generally preferred for unfiltered seawater service.
Why Source 21?
- ISO 9001-certified quality system with full chemistry and mechanical traceability on every shipment
- Multi-million dollar national inventory across stainless, nickel alloys, copper, and brass
- Strong domestic and international mill relationships, including premium specialty mill partnerships
- In-house slitting, edging, leveling, and cut-to-length capabilities
- Contract programs, blanket orders, and vendor-managed inventory (VMI) for production accounts
- Responsive technical support for tight-tolerance and certification-driven work
Request a Quote
Contact Source 21 today for C70600 90/10 Copper-Nickel pricing, availability, and processing options. Our team responds quickly, asks the right questions, and gets you accurate quotes on real material — not vague placeholders.
Call 631-821-1101 or request a quote online to get started.
Founded in 1990 Source 21 is a leading distributor and processor of stainless steel, copper and brass products.
Quick Links
Copyright © 2026 Source 21 - All Rights Reserved