ASTM B111 C70600 Copper Nickle 90/10 Seamless Tube For Heat
Exchanger and Condenser
ASTM B111 C70600 Copper Nickel 90/10 Seamless Tube is a type of
tube material that is made from a copper-nickel alloy. This
particular alloy consists of approximately 90% copper and 10%
nickel, hence the designation "90/10." The ASTM B111 specification
establishes the requirements for this type of seamless tube, which
is commonly used in heat exchangers, condensers, and similar
applications in marine environments where corrosion resistance is
critical.
The addition of nickel to the copper improves the strength and
corrosion resistance of the material, making it particularly
suitable for use in saltwater environments. The 90/10 copper-nickel
alloy is known for its durability, thermal stability, and excellent
resistance to biofouling in seawater.
Key Features of ASTM B111 C70600:
1. Material Composition:
Chemical Composition (ASTM B111 C70600)
| Element | Composition (% by Weight, max unless specified) |
| Copper (Cu) | Remainder (Balance) |
| Nickel (Ni) | 9.0 - 11.0 |
| Iron (Fe) | 1.0 - 1.8 |
| Manganese (Mn) | 0.5 - 1.0 |
| Lead (Pb) | 0.05 max |
| Zinc (Zn) | 1.0 max |
| Carbon (C) | 0.05 max |
| Phosphorus (P) | 0.02 max |
| Sulfur (S) | 0.02 max |
| Others (Total) | 0.5 max |
Notes:
Small amounts of Fe & Mn enhance corrosion resistance in seawater.
Low Pb, S, P ensure weldability & formability.
2. Mechanical Properties (ASTM B111 C70600 Seamless Tubes)
A. Wrought (Drawn/Annealed) Tubes
| Property | Annealed (Softened) Condition | Hard-Drawn (Cold Worked) Condition |
| Tensile Strength (min) | 290 MPa (42 ksi) | 380 MPa (55 ksi) |
| Yield Strength (0.2% offset, min) | 125 MPa (18 ksi) | 275 MPa (40 ksi) |
| Elongation (min, % in 50mm) | 30% | 15% |
| Hardness (Rockwell B, max) | 65 HRB | 85 HRB |
B. Other Key Properties
- Density: 8.94 g/cm³
- Melting Point: ~1100-1145°C (2012-2093°F)
- Thermal Conductivity: ~40 W/m·K
- Electrical Conductivity: ~9% IACS (low, due to Ni content)
- Corrosion Resistance: Excellent in seawater, brine, and acidic
environments.
3. Advantages:
- Superior performance in saltwater and brine environments.
- Long service life with minimal maintenance.
4. Common Forms & Tempers
- Seamless Tubes (ASTM B111):
Annealed (O60): Soft, ductile, easy to bend/flare.
Hard-Drawn (H80): Higher strength, used for pressure applications.
- Other Product Forms (Related Standards):
Pipe: ASTM B466 (welded) / B467 (seamless)
Fittings: ASTM B366
Plate/Sheet: ASTM B171 / B552
5. Comparison Table: Key Copper Alloys vs. C70600 (90/10 Cu-Ni)
| Alloy (UNS) | Common Name | Composition | Key Properties | Main Applications |
| C70600 | 90/10 Copper-Nickel | Cu (89-91%), Ni (9-11%), Fe (1-1.8%), Mn (0.5-1%) | Excellent seawater corrosion resistance, good weldability, moderate
strength | Marine heat exchangers, desalination, ship piping |
| C71500 | 70/30 Copper-Nickel | Cu (65-70%), Ni (29-33%), Fe (0.4-1%), Mn (0.5-1.5%) | Superior seawater corrosion resistance, higher strength than C70600 | Offshore oil & gas, naval condensers, chemical processing |
| C12200 | Phosphorized Copper (DHP) | Cu (99.9%), P (0.015-0.04%) | High thermal/electrical conductivity, good formability | Plumbing, HVAC, electrical wiring |
| C44300 | Admiralty Brass | Cu (70-73%), Zn (26-30%), Sn (0.9-1.2%), As (0.02-0.06%) | Good corrosion resistance in freshwater/steam, biofouling
resistance | Power plant condensers, heat exchangers |
| C68700 | Aluminum Brass | Cu (76-79%), Zn (19-22%), Al (1.8-2.5%), As (0.02-0.06%) | High erosion-corrosion resistance, stronger than admiralty brass | Seawater cooling systems, heat exchangers |
6.The Applications of YuHong ASTM B111 C70600 Copper Nickel 90/10
Seamless Tube
- Marine & Offshore Applications
a) Shipbuilding & Naval Systems
Condenser & Heat Exchanger Tubes – Used in marine condensers,
evaporators, and coolers due to resistance to biofouling and
seawater corrosion.
Seawater Piping Systems – Preferred for ballast water systems,
firefighting lines, and desalination plants because it resists
pitting and erosion.
Propulsion & Cooling Systems – Used in engine cooling, lubricating
oil coolers, and exhaust gas scrubbers.
b) Offshore Oil & Gas
Platform Cooling Systems – Resists sulfide attack in sour gas
environments.
Subsea Piping & Risers – Handles high-pressure seawater without
degradation.
- Power Generation & Desalination
a) Power Plants (Nuclear, Thermal, & Coastal)
Feedwater Heaters & Condensers – Resists ammonia attack in steam
systems.
Cooling Water Tubes – Used in coastal power stations where seawater
cooling is required.
b) Desalination Plants
Multi-Stage Flash (MSF) & Reverse Osmosis (RO) Systems – Handles
high-salinity brine without corrosion.
- Chemical & Process Industries
Heat Exchangers for Chemical Processing – Resists acidic and
alkaline fluids.
Brine & Chloride Handling Systems – Used in chlor-alkali plants and
saltwater refining.
- Industrial & HVAC Systems
Cooling Coils & Refrigeration Systems – Performs well in
humid/salty environments (e.g., coastal HVAC systems).
Hydraulic & Instrumentation Tubing – Used in offshore rigs and
chemical plants due to leak-proof reliability.
- Renewable Energy (Ocean Thermal & Offshore Wind)
Heat Exchangers for OTEC (Ocean Thermal Energy Conversion) –
Withstands deep-sea water pressure & corrosion.
Cooling Systems for Offshore Wind Farms – Used in subsea
transformer cooling.
