70/30 Copper Nickel Pipe

70/30 Copper Nickel Pipe, also known as UNS C71500 copper nickel pipe, is widely used in seawater piping systems where excellent corrosion resistance, high strength and long service life are required. Compared with 90/10 copper nickel, 70/30 Cu-Ni offers higher nickel content and better performance in high-velocity seawater, polluted marine environments and demanding offshore applications.

As a professional 70/30 Copper Nickel Pipe and Tube manufacturer and supplier, we offer seamless and welded C71500 CuNi 70/30 pipes and tubes in a full range of sizes, wall thicknesses, and international standards.

If you are comparing different copper nickel materials, you may also visit our page for 90/10 Copper Nickel Pipe or view our full range of Copper Nickel Pipe Products.

Product: 70/30 Copper Nickel Pipe
Common Grade: UNS C71500 / CuNi 70/30
Type: Seamless / Welded
Standards: ASTM B466, ASTM B467, ASME SB466, ASME SB467
Applications: Marine, Offshore, Seawater, Desalination

70 30 copper nickel pipe for marine and seawater piping systems

What Is 70/30 Copper Nickel Pipe?

70/30 copper nickel pipe is a copper-based alloy pipe containing approximately 70% copper and 30% nickel, with small additions of iron and manganese to improve resistance to seawater corrosion and erosion. The most common grade is UNS C71500, also referred to as CuNi 70/30 or C71500 copper nickel pipe.

This alloy forms a stable protective surface film when exposed to seawater, helping the pipe resist pitting, crevice corrosion and biofouling. Because of this, 70/30 Cu-Ni pipe is often selected for critical seawater systems where reliability is more important than short-term material cost.

70/30 Copper Nickel Pipe Specifications

Item	Description
Product Name	70/30 Copper Nickel Pipe
Common Grade	UNS C71500 / CuNi 70/30
Material	Copper Nickel Alloy
Pipe Type	Seamless / Welded
Standards	ASTM B466, ASTM B467, ASME SB466, ASME SB467
Size Range	Custom sizes available upon request
Wall Thickness	SCH 10, SCH 40, SCH 80 or customized
Surface	Pickled, polished, bright, mill finish
End Type	Plain end, beveled end, threaded end
Application	Marine, offshore, seawater, shipbuilding, desalination
Testing	Chemical analysis, mechanical test, hydrostatic test, NDT available

For special dimensions or project specifications, please contact our team through the Request a Quote page.

Advantages of 70/30 Copper Nickel Pipe

Excellent Seawater Corrosion Resistance

70/30 copper nickel pipe performs well in natural seawater, brackish water and many industrial water environments. It is especially suitable for systems exposed to high flow rates or harsh marine conditions.

Higher Strength Than 90/10 Cu-Ni

With higher nickel content, 70/30 Cu-Ni provides better mechanical strength than 90/10 copper nickel. This makes it a preferred option for offshore, naval and heavy-duty marine piping systems.

Good Resistance to Erosion and Impingement

The alloy offers strong resistance to erosion corrosion, making it suitable for seawater cooling lines, fire water systems and high-velocity piping.

Long Service Life with Low Maintenance

Thanks to its natural corrosion resistance, 70/30 copper nickel pipe usually requires less maintenance compared with many conventional piping materials used in seawater service.

Easy Fabrication and Welding

70/30 Cu-Ni pipe can be welded, formed and fabricated using standard industry procedures. Matching Copper Nickel Fittings and Copper Nickel Flanges are also available for complete piping systems.

Complete Piping System Supply

We can supply pipes, tubes, fittings, flanges and related copper nickel products together to reduce compatibility issues and simplify procurement for marine and offshore projects.

70/30 (UNS C71500) CuNi Pipe Chemical Composition

	KME CuNi70/30	DIN 176642.0882	BS 2871 CN107	ASTM B466C71500	JIS H3300C7150T
Ni%	30.0-32.0	30.0-32.0	30.0-32.0	29.0-33.0	29.0-33.0
Fe%	0.47-0.7	0.4-1.0	0.4-1.0	0.4-1.0	0.4-1.0
Mn%	0.5-1.0	0.5-1.5	0.5-1.5	max.1.0	0.2-1.0
C%	max.0.04	max.0.05	max.0.06	max.0.05
Pb%	max.0.01	max.0.03	max.0.01	max.0.02	max.0.05
S%	max.0.01	max.0.02	max.0.08	max.0.02
P%	max.0.02	max.0.02		max.0.02
Zn%	max.0.20	max.0.50		max.0.50	max.0.50
Other	max.0.30	max.0.30
Cu%	rem.	rem.	rem.	rem.	+Ni+Fe+Mn min99.5

Applications of 70/30 Copper Nickel Pipe

70/30 copper nickel pipe is widely used in industries that require reliable corrosion resistance in seawater and marine environments.

Common applications include:

Seawater cooling systems
Shipbuilding and naval vessels
Offshore oil and gas platforms
Desalination plants
Power plant condenser systems
Fire water piping systems
Heat exchangers and condensers
Ballast and bilge systems
Marine hydraulic and sanitary lines
Coastal industrial water systems

For heat transfer systems, you can also check our related Copper Nickel Tubes for condenser and heat exchanger applications.

70/30 Copper Nickel Pipe vs 90/10 Copper Nickel Pipe

Both 70/30 and 90/10 copper nickel pipes are used in marine environments, but they are usually selected for different service conditions.

Item	70/30 Copper Nickel Pipe	90/10 Copper Nickel Pipe
Nickel Content	Higher, around 30%	Lower, around 10%
Strength	Higher	Moderate
Seawater Resistance	Better in severe conditions	Good for general seawater service
Cost	Higher	More economical
Common Use	Offshore, naval, high-flow seawater systems	Shipbuilding, general marine piping

If your project requires higher mechanical strength or stronger resistance in aggressive seawater, 70/30 copper nickel pipe is often the better choice. For general marine piping, 90/10 Copper Nickel Pipe may be a cost-effective alternative.

HC Available Copper Nickel Product Forms

We can supply 70/30 copper nickel products for complete piping projects, including:

Quality Control and Testing

Every batch of 70/30 copper nickel pipe can be supplied with inspection documents according to customer requirements.

Typical quality control items include:

Chemical composition analysis
Mechanical property testing
Dimensional inspection
Visual surface inspection
Hydrostatic pressure test
Eddy current test or ultrasonic test
PMI test if required
Mill test certificate EN 10204 3.1 available

Why Choose Us for 70/30 Copper Nickel Pipe?

Choosing the right copper nickel pipe supplier is important for project safety, delivery time and long-term system performance. We support customers with stable material supply, flexible processing and professional export service.

Our advantages include:

Supply of UNS C71500 70/30 copper nickel pipe
Seamless and welded pipe options
Standard and custom sizes available
Matching fittings and flanges supplied together
Support for ASTM, ASME and project standards
Export packing suitable for sea transportation
Fast response for technical and commercial inquiries

If you are working on a marine, offshore or desalination project, send us your pipe size, wall thickness, standard and quantity. Our sales team will provide a practical quotation based on your requirements.

Packaging and Delivery

70/30 copper nickel pipes are carefully packed to protect the surface during handling and transportation. Common packaging methods include wooden cases, bundles, plastic caps, waterproof wrapping and customized export packaging.

Delivery time depends on size, quantity and stock availability. For urgent requirements, please contact us directly through Contact Us to check current inventory and production schedule.

Frequently Asked Questions

What is 70/30 copper nickel pipe?

70/30 copper nickel pipe is a copper nickel alloy pipe with approximately 70% copper and 30% nickel. The common grade is UNS C71500. It is mainly used in seawater, marine and offshore piping systems.

Is 70/30 copper nickel better than 90/10 copper nickel?

70/30 copper nickel has higher nickel content and better strength than 90/10 copper nickel. It is more suitable for harsh seawater conditions, offshore platforms and high-velocity systems. 90/10 copper nickel is often used for general marine service.

What standards are available for 70/30 copper nickel pipe?

Common standards include ASTM B466, ASTM B467, ASME SB466 and ASME SB467. Other project-specific standards can be discussed before production.

Can you supply fittings with 70/30 copper nickel pipe?

Yes. We can supply matching Copper Nickel Fittings, including elbows, tees, reducers, caps and flanges for complete piping systems.

How can I get a quotation?

Please send your required pipe size, wall thickness, length, standard, quantity and delivery destination through our Request a Quote page. We will reply with pricing and delivery details as soon as possible.

Get a Quote for 70/30 Copper Nickel Pipe

Looking for reliable 70/30 Copper Nickel Pipe for marine, offshore or seawater systems? Contact us today with your technical requirements. We can help you select the right material, confirm the standard and provide a competitive quotation for your project.

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