Cu-Ni 90/10 Tube Specifications

Specifications of C70600 tubes, including standards, dimensions, forms, finishes, and more, are provided in the table below.

Parameter Specification
Standards ASTM B111 / ASME SB111, ASTM B466 / ASME SB466
Form Seamless / Welded Tubes
Outer Diameter (OD) 1/8" (3 mm) to 2" (50 mm)
Wall Thickness 0.035" (1 mm) to 0.120" (3 mm)
Length Up to 6 meters standard, custom lengths available
Temper Annealed (Soft), Light Drawn
Surface Finish Mill Finish, Polished
Manufacturing Method Cold Drawn / Extruded
End Finish Plain End, Bevelled End, Threaded

Cu-Ni 90/10 Tube Sizes

Cu-Ni 90/10 tubes are available in a wide range of sizes to suit condenser, heat exchanger, and piping applications, with both standard and custom options.

Parameter Details
Outside Diameter (OD) 1/8" (3 mm) to 2" (50 mm)
Wall Thickness 0.035" (1 mm) to 0.120" (3 mm)
Standard Lengths 12 ft and 20 ft
Custom Lengths Available on request (cut-to-size options)
Condenser Tube Sizing Based on Birmingham Wire Gauge (BWG)
Piping Tube Sizing Based on Nominal Pipe Size (NPS) with standard or light wall schedules
Dimensional Tolerances Supplied as per project-specific requirements

Cu-Ni 90/10 Tube Price

Cu-Ni 90/10 tube price is ₹550 to ₹1,200 per kilogram or $8 to $15 per kg. The final price depends on outside diameter, wall thickness, length, order quantity, form (seamless or welded), and the applicable specification.

Copper and nickel commodity prices on the LME directly influence finished tube pricing. Contact our sales team with your full specification, quantity, and delivery requirements for a current and competitive quotation. Mill test certificates, third-party inspection reports, and full material traceability documentation are included with every order at no extra charge.

Chemical Composition of Cu-Ni 90/10 Tube

The table below lists the chemical composition of Cu-Ni 90/10 tube (C70600) as specified under ASTM B111.

Iron content improves resistance to impingement attack and erosion-corrosion in flowing seawater. Manganese supports deoxidation during casting and improves the alloy's hot working response.

Copper Cu
Balance
Nickel Ni
9.0 – 11.0%
Iron Fe
1.0 – 1.8%
Manganese Mn
Max 1.0%
Carbon C
Max 0.05%
Lead Pb
Max 0.02%
Sulphur S
Max 0.02%
Zinc Zn
Max 0.50%
Phosphorus P
Max 0.02%

Mechanical Properties of Cu-Ni 90/10 Tube

The following table presents the minimum mechanical property values for C70600 tube per ASTM B111.

Cu-Ni 90/10 tubing retains good ductility even after prolonged service at moderate temperatures. The annealed temper (O61) is the most common supply condition for condenser and heat exchanger duty, as it offers the best combination of formability and corrosion performance.

275 / 40
MPa (min)
Tensile Strength
105 / 15
MPa (min)
Yield Strength
30%
(min)
Elongation
100 HV
max
Hardness
Property Value
Tensile Strength 275 MPa (40 ksi) min
Yield Strength (0.2% extension) 105 MPa (15 ksi) min
Elongation (in 50 mm) 30% min
Hardness 100 HV max (annealed temper)
Request a Quote for Cu-Ni 90/10 Tubes Request a Quote

Cu-Ni 90/10 Tube Equivalent Designations

C70600 tube international designations, including UNS, Werkstoff Nr., JIS, and more, are listed in the table below.

Designation Equivalent
UNS C70600
Werkstoff Nr.  2.0872
BS CN102
EN CW352H
JIS H3300 C7060

Cu-Ni 90/10 Tube Forms

Cu-Ni 90/10 tubes come in two primary forms: seamless and welded. The choice between them depends on application pressure, service criticality, and budget.

  • Seamless Cu-Ni 90/10 Tube
  • Welded Cu-Ni 90/10 Tube

Cu-Ni 90/10 Tube Industrial Applications

Cu-Ni 90/10 tubes find primary use in environments where seawater corrosion resistance, biofouling resistance, and reliable heat transfer matter. 4 major sectors account for the bulk of demand.

Marine & Shipbuilding

Naval vessels and commercial ships use this tube for seawater cooling lines, fire main systems, and bilge piping. Its natural resistance to marine biofouling reduces maintenance frequency during vessel service life.

Heat Exchangers & Condensers

Cupronickel 90/10 tubes are the standard tube material in shell-and-tube heat exchangers and steam condensers in power generation and process industries. Good thermal conductivity supports efficient heat transfer between fluids.

Desalination Plants

Multi-stage flash (MSF) and multi-effect distillation (MED) plants use C70600 tubing in their evaporator and condenser sections. It tolerates the combination of high-temperature brine and dissolved chlorides without pitting.

Oil & Gas / Offshore

Offshore platforms specify Cu-Ni 90/10 tube for seawater intake, firewater systems, and hydraulic control lines. The alloy meets the performance requirements for copper alloy piping in offshore service.

Cu-Ni 90/10 vs Cu-Ni 70/30 Tube

Buyers frequently compare these two cupronickel grades. The table below summarises the key differences between them.

Property Cu-Ni 90/10 (C70600) Cu-Ni 70/30 (C71500)
Nickel Content 9 to 11% 29 to 33%
Tensile Strength (min) 275 MPa (40 ksi) 370 MPa (54 ksi)
Thermal Conductivity 45 W/m.K 29 W/m.K
Seawater Velocity Limit Up to 3.5 m/s Up to 4.0 m/s
Relative Cost Lower Higher

Cu-Ni 90/10 is the better fit for standard marine piping, condensers, and heat exchangers where moderate seawater velocities apply. Cu-Ni 70/30 becomes the necessary choice when aggressive, high-velocity seawater or higher corrosion allowances are required.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect Cu-Ni 90/10 tubes from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Tube Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies copper nickel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

  • USA flagUSA
  • Canada flagCanada

Frequently Asked Questions:

What are the standard sizes available for Cu-Ni 90/10 Tubes? +
Cu-Ni 90/10 tubes are available in outside diameters from 1/8" (3 mm) to 2" (50 mm) and wall thicknesses from 0.035" (1 mm) to 0.120" (3 mm). Standard lengths are 12 ft and 20 ft. Custom sizes can be produced to order.
How do you calculate the weight of a Cu-Ni 90/10 Tube? +
Weight per metre is calculated using the formula: (OD - WT) x WT x 0.02769, where OD is the outside diameter in mm and WT is the wall thickness in mm. The density of Cu-Ni 90/10 is 8.94 g/cm3 (0.323 lb/in3).
What is the difference between Cu-Ni 90/10 and Cu-Ni 70/30 Tubes? +
Cu-Ni 90/10 has lower nickel content (9 to 11%) and provides better thermal conductivity at a lower cost. Cu-Ni 70/30, with 29 to 33% nickel, provides stronger resistance to high-velocity seawater and more aggressive corrosive conditions. For standard marine piping, 90/10 is generally sufficient.
Can Cu-Ni 90/10 Tubes be welded? +
CuNi 90/10 tubes have good weldability. Gas shielded arc welding (TIG/MIG) is the preferred joining method. ERCuNi filler wire should be used. Brazing and soldering are also viable joining options for lower-stress connections.
What is the density of Cu-Ni 90/10? +
The density of Cu-Ni 90/10 (C70600) is 8.94 g/cm3 (0.323 lb/in3). This value is used in weight calculations for tube procurement and structural analysis.

Contact Us for Availability & Current Pricing Request a Quote