Products Description
Product Specifications
| Standards | ASTM B111 / ASME SB111 |
| Steel Grades | UNS C71500/ CuNi30Mn1Fe / Copper Nickel 70/30 |
| Equivalent Standards | EN 12449 CuNi30Fe,BS 2871 CN107,DIN 2.0882,JIS H3300 C7150 |
| Outer Diameter (OD) | 6 mm – 219 mm |
| Wall Thickness (WT) | 0.5 mm – 10 mm |
| Length | 6/12 m |
| Surface Treatment | Mill Finish, Bright Finish, Pickled Surface |
| Production Process | Cold Drawn / Cold Rolled |
| Condition | Soft Annealed, Straight Length, U-Bend Tube Available |
In seawater environments, 70 30 copper nickel tube forms a dense, self-healing protective oxide film that effectively resists general corrosion, pitting, and crevice corrosion. Its corrosion resistance is significantly superior to that of aluminum brass and 316L stainless steel, particularly in polluted or sulfide-containing seawater. Furthermore, the copper ions in the 70/30 copper-nickel alloy inhibit marine organism attachment, thereby reducing the risk of microbiologically influenced corrosion.
The thermal conductivity of C71500 copper-nickel tubing at 20°C is approximately 29 W/m·K-higher than that of 316L stainless steel (approximately 16 W/m·K) and titanium (approximately 16–22 W/m·K)-thereby enabling a substantial increase in heat-exchange efficiency for marine condensers and heat exchangers.
Customized Services
- TORICH offers customization of non-standard outer diameters, wall thicknesses, and fixed lengths based on customer equipment drawings, achieving tolerances as tight as ±0.05mm.
- End processing options include plain ends, chamfering, beveling (30°, 37.5°, etc.), flaring, and swaging.
- Surface treatments such as pickling and passivation, bright annealing, sandblasting, and degreasing/cleaning are available.
- U-bend tubes can be fabricated according to heat exchanger tube bundle drawings, with precise control over minimum bending radius and ovality.
Chemical Composition
| Element | Cu | Ni | Fe
|
Mn | Zn | Pb | Others |
| Composition (%) | Balance (~70%) | 29.0 – 33.0 | 0.4 – 1.0 | 0.2 – 1.0 | 0.5 max | 0.05 max | Trace |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| Requirement | 310–517 | 110–205 | ≥ 30 | 70–120 |
Possible Alternative Grades
- 90/10 Cu-Ni tubing (UNS C70600) offers lower raw material costs and slightly higher thermal conductivity, making it suitable for clean seawater cooling systems characterized by lower flow velocities and water temperatures.
- For auxiliary piping where heat transfer efficiency requirements are modest but structural strength demands are high, 316L or 2205 stainless steel is a suitable choice due to its high mechanical strength and low cost.
- If operating conditions demand exceptional seawater corrosion resistance and the budget permits, Grade 2 titanium may be selected for applications requiring ultra-high reliability, such as main condensers or specialized desalination units.
application areas
Thanks to their excellent resistance to seawater corrosion and high heat transfer efficiency, ASTM B111 70 30 copper nickel tube is widely used in various high-end marine thermal energy conversion and cooling systems, including the following applications:
- Seawater coolers for marine main and auxiliary engines
- Marine condensers and freshwater generators
- Seawater heat exchange systems for offshore platforms
- Power plant condensers and auxiliary coolers
- Seawater desalination units (MSF/MED)
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the operating temperature range for ASTM B111 70/30 copper-nickel tubing?
A: The operating temperature range is -20°C to 120°C, covering the vast majority of marine seawater heat exchange and condensation applications. The material exhibits no performance degradation or structural deformation across this entire range, making it suitable for marine environments subject to seasonal temperature fluctuations.
Q: Can the tubing be welded?
A: Yes. 70/30 copper-nickel alloy offers excellent weldability; common welding methods include TIG, MIG, and manual arc welding. During welding, contamination from iron or carbon steel must be avoided, and compatible copper-nickel welding consumables should be used.
Q: Why is 70/30 copper-nickel tubing recommended for seawater heat exchange applications compared to stainless steel tubing?
A: Stainless steels such as 316L are prone to pitting and crevice corrosion in seawater environments. In contrast, 70/30 copper-nickel tubing accommodates a wider range of seawater flow velocities, offers superior corrosion and biofouling resistance, and ensures greater long-term reliability.
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