Copper Nickel Pipes & Tubes | CuNi 90/10 (C70600) & 70/30 (C71500) | ASTM / EN / IS

Q: Which grade should I use: CuNi 90/10 or 70/30?

CuNi 90/10 (C70600) is used for most seawater cooling and marine heat exchanger service due to excellent corrosion resistance and workability. CuNi 70/30 (C71500) is preferred for more demanding seawater conditions (higher velocity / higher erosion risk) where higher strength and robustness are required.

Q: Do you supply condenser/heat exchanger Cu-Ni tubes and marine piping?

Yes. Cu-Ni tubes for condensers/heat exchangers and Cu-Ni piping can be supplied as per your standard, size and test requirements. Share OD/WT, length, temper/condition, quantity and service details for quotation.

Q: Can you supply both metric and imperial dimensions?

Yes. OD/WT can be supplied in mm and inches across drawings, packing lists and documentation. Share the governing standard to align tolerances and test plan.

Copper Nickel Pipes & Tubes (Cu-Ni)

Seawater-grade CuNi tubing for marine, offshore, heat exchangers and condenser systems — engineered for corrosion resistance and reliable service.

Marine & Offshore Heat Exchangers Seawater Corrosion Industrial Service

Product Overview

Copper Nickel tubing built for seawater, high reliability and long service life

R V Metal Corporation supplies Copper Nickel (Cu-Ni) pipes and tubes in seamless and welded forms (as applicable by size and specification) for seawater cooling, shipbuilding, offshore platforms, desalination, condensers, heat exchangers and general marine engineering. Cu-Ni alloys are selected based on seawater velocity, temperature, erosion-corrosion risk, biofouling tendency, strength requirements, and fabrication needs (bending, flaring, expanding). CuNi 90/10 (UNS C70600) is widely used for seawater service with excellent corrosion resistance and workability. CuNi 70/30 (UNS C71500) offers higher strength and improved resistance in more demanding seawater conditions (higher velocities / higher erosion risk). Special Cu-Ni families (e.g., 95/5 or iron/manganese modified grades) are supplied as per customer standard and application requirements.

Standards

ASTM / EN / IS standards supported as per grade, form and application (share your governing standard for compliance).

Forms

Round tubes, condenser tubes, custom cut lengths and fabrication-ready supply for marine & heat transfer systems.

Traceability

Heat/lot traceability, MTCs, inspection support and documentation on request.

Technical Specifications

Master Specification Chart

Parameter	Specification
Grades (Common)	CuNi 90/10 – UNS C70600 (seawater cooling, condensers, marine piping) CuNi 70/30 – UNS C71500 (higher strength; demanding seawater service) Also supplied: special Cu-Ni grades (e.g., 95/5 or modified Cu-Ni alloys) as per customer standard and service conditions.
Standards	ASTM / EN / IS supported (as applicable). Share your drawing/spec to lock chemistry, tolerances, temper and test plan. Typical ASTM families (as applicable): condenser/heat exchanger tubing and Cu-Ni pipe/tube standards.
Temper / Condition	Annealed (O) • Stress Relieved (SR) • As per ordered standard (availability depends on grade + size)
Size Range (OD)	As per order — round tubes and pipes supported. Provide OD/WT in inches (in) or millimetres (mm) and length in m/ft.
Units	All dimensions supported in mm and inches on drawings, MTC and packing lists
Testing (on request)	Dimensional checks • Eddy current (where required) • Hydro/pressure test (where specified) • Visual/surface checks • MTC

For accurate quotation: grade (C70600/C71500), OD × WT, length, quantity, service water (fresh/seawater), velocity/temperature (if known), and destination.

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Metallurgy

Chemical Composition

Element	Typical (guide)
Cu	Balance
Ni	~ 10%
Fe / Mn	Small additions (grade dependent)
Notes	Excellent seawater corrosion resistance; widely used for marine cooling and heat exchangers.

Element	Typical (guide)
Cu	Balance
Ni	~ 30%
Fe / Mn	Small additions (grade dependent)
Notes	Higher strength than 90/10; preferred for more demanding seawater conditions and erosion risk.

Type	Typical (guide)
CuNi 95/5	Ni ~ 5% (application-specific)
Modified Cu-Ni	Fe/Mn tailored to service water & velocity requirements
Notes	Share your governing standard and service media so we can propose the correct grade and documentation.

Note: chemistry ranges depend on the governing standard. Final composition is supplied as per ordered spec + MTC.

FAQ

Common Procurement & Technical Questions

Which grade should I use: CuNi 90/10 or 70/30?

Use CuNi 90/10 (C70600) for most seawater cooling and marine heat exchanger service with excellent corrosion resistance and good workability. Use CuNi 70/30 (C71500) for more demanding conditions (higher velocity, higher erosion risk) where extra strength and robustness is required. If you can share service water quality + velocity + temperature, we’ll recommend the correct grade and standard.

Do you supply condenser/heat exchanger Cu-Ni tubes and marine piping?

Yes. We supply Cu-Ni tubes for condensers/heat exchangers and Cu-Ni piping as per your standard, size and test requirements. Share OD/WT, length, temper/condition, quantity and service details for fast quotation.

Do you provide MTC (Mill Test Certificate) and traceability?

Yes. MTC with chemistry and mechanical properties (as applicable), heat/lot traceability and inspection documents can be provided depending on order requirements.

Can you supply both metric and imperial dimensions?

Yes. We support OD/WT in mm and inches across drawings, packing lists and documentation. Share your governing standard to align tolerances and test plan.