CuNi 70/30 Seamless Pipe, Erosion Resistant for Seawater Systems
CuNi 70/30 Seamless Pipe, Erosion Resistant for Seawater Systems
1.Product Introduction
Copper nickel pipe is a versatile alloy tubing manufactured from the Cu‑Ni system, primarily available in 90/10 (C70600) and 70/30 (C71500) compositions. These alloys are strengthened with small amounts of iron and manganese to improve mechanical properties and corrosion resistance. The product is available in both seamless and welded configurations, manufactured in accordance with ASTM B466, ASTM B111, ASME SB111, EN 12451, and JIS H3300. It is a well‑established material for seawater piping and heat exchanger applications worldwide.
2.Product Advantages
-
Highly resistant to seawater, brackish water, and saline solutions across a wide temperature spectrum.
-
Copper ion release provides built‑in protection against barnacle, algae, and mussel settlement.
-
Performs reliably under turbulent flow and entrained sand conditions.
-
Easily welded (TIG), brazed, and formed with standard shop equipment.
-
Proven durability – countless installations exceed 50 years of active service.
-
Fully immune to chloride‑induced stress‑corrosion cracking.
-
Enables thinner wall designs than carbon steel, reducing structural load.
-
Substantially more affordable than titanium or nickel‑based alternatives.
3.Product Applications
-
Naval and commercial vessels – seawater intakes, fire mains, ballast, and cooling loops.
-
Fixed and floating offshore structures – topside pipework, subsea umbilicals, and riser coatings.
-
Thermal and reverse‑osmosis desalination – heat exchanger tubing and brine transfer lines.
-
Electric utility plants – surface condensers and turbine cooling water systems.
-
Process industries – heat exchangers for chemical, refining, and pharmaceutical services.
-
Green marine energy – closed‑loop cooling for tidal turbines and wave energy converters.
-
Fish farming – seawater delivery headers and structural cage members.
-
Specialty vehicle and aircraft – high‑reliability hydraulic and pneumatic lines.
4.Key Product Parameters
| Descriptor | 90/10 (C70600) | 70/30 (C71500) |
| Base Elements (wt%) | Cu 88.6+ / Ni 9-11 / Fe 1.0-1.8 / Mn ≤1.0 | Cu bal. / Ni 29-31 / Fe 0.4-1.0 / Mn ≤1.0 |
| UTS, min (MPa) | 303 | 350 (representative) |
| 0.2% Proof Stress (MPa) | 110-393 (temper dependent) | 120 (representative) |
| Elongation, min (%) | 42 | 35 |
| Young's Modulus (GPa) | 140 | 140 |
| Thermal Conductivity (W/m·K) | 50 | 29 |
| Mass Density (g/cm³) | 8.90 | 8.95 |
| Melting Range (°C) | 1080-1120 | 1170-1240 |
| Seamless Tube OD (mm) | 6 – 159 | 6 – 159 |
| Welded Tube OD (mm) | up to 419 | up to 419 |
| Seamless Tube WT (mm) | 0.5 – 8.0 | 0.5 – 8.0 |
| Welded Tube WT (mm) | up to 10.0 | up to 10.0 |
| Length Options | 6m, 12m, or as ordered | 6m, 12m, or as ordered |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2. How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity. 3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.