Copper Nickel 70/30
At Arbor/Metals Inc., we’re a well-known copper-nickel alloy supplier for a wide range of commercial and industrial applications. We offer high-quality copper nickel 70/30 grade products that meet demanding project needs. Regardless of the size, thickness, or processing your application requires, we deliver precise results you can depend on.
Copper Nickel 70/30 Product Overview
The 70/30 grade of copper-nickel alloy contains 70% copper and 30% nickel. There are also trace amounts of manganese and iron. This alloy provides fantastic tensile strength, durability, and corrosion resistance.
Depending on alloy specs, 70/30 grade products carry several industry designations, such as CN107, C71500, CEF STAN 02-879 Annex B, CuNi30Mn1Fe, and CW354H. Copper-nickel alloys excel in seawater applications, including brackish water and high-velocity water flow.

Industries That Use 70/30 Copper-Nickel Products
As a copper-nickel alloy supplier with decades of expertise, we’ve worked with many industries over the years. Cupronickel 70/30 alloys play a huge role in the marine industry, such as naval vessels, large- and small-scale shipbuilding operations, oceanic petrochemical applications, and off-shore drilling rigs.
In practice, any industry with operations that require long-term contact with high volumes of saltwater, brackish water, or contaminated water flow can benefit from 70/30 grade alloys. For example, many power plants use this material for cooling systems.
Primary Applications for 70/30 Grade Copper Nickel
Copper nickel 70/30 products are useful in many oceanic and industrial applications, such as:
- Heat exchangers and evaporator tubes
- Condenser components
- Saltwater pipes, fittings, flanges, and intakes
- Desalination units, pump housings, and valve housings
- Pressure tanks and boiler parts
- Marine sheathing and structural exteriors
This alloy rating is especially suited to applications where superior strength and water flow are necessary.
Key Benefits of 70/30 Alloys
One of the main reasons to choose copper-nickel products is because of the protective layer that forms in the presence of seawater. This coating of cuprous oxide and other oxides offers a natural resistance to biofouling in marine environments.
Other advantages include:
- High resistance to pitting, stress corrosion, and cracking
- Strong thermal conductivity
- Good compatibility with hot-working and cold-forming methods
- Excellent weldability (brazing, spot welds, soldering, GSAW, CMAW, seam welds)
The 30% nickel in this alloy gives it significant strength and durability in demanding environments.
Copper Nickel 70/30 Versus 90/10 Grades
We work extensively with both 70/30 and 90/10 grades. Both products offer dependability for marine applications. Cupronickel 70/30 alloys are a better choice for higher velocities of seawater or intense pressure. On the other hand, 90/10 grades are usually more cost-effective.
An Experienced Copper-Nickel Alloy Supplier
At Arbor/Metals Inc., we can help you find the right materials and product specs for your applications. Contact us for more information about copper nickel 70/30 or custom orders.