Copper-Nickel 90/10 & 70/30 Flanges & Fittings for Marine Piping
Copper-nickel alloys resist seawater corrosion and biofouling, which is why they are the standard choice for ship and naval seawater systems, firemains and offshore cooling.
Teshi Group manufactures copper-nickel 90/10 and 70/30 flanges and fittings for shipyards and marine projects, to EEMUA 145 / 146 dimensions and ASTM material specifications, or to naval drawings.
Copper-Nickel — grades, chemistry and properties
Grades and ASTM / ASME specifications
| Grade | Forged flanges & fittings | Butt weld fittings | Plate | Pipe |
|---|---|---|---|---|
| Cu-Ni 90/10UNS C70600 · W.Nr. 2.0872 | EEMUA 145 / to drawing | EEMUA 146 | ASTM B171 | ASTM B466 / B467 |
| Cu-Ni 70/30UNS C71500 · W.Nr. 2.0882 | EEMUA 145 / to drawing | EEMUA 146 | ASTM B171 | ASTM B466 / B467 |
Chemical composition (weight %, maximum unless a range is given)
| Grade | Mn | Ni | Cu | Fe | Zn | Pb |
|---|---|---|---|---|---|---|
| Cu-Ni 90/10 | 1.0 | 9.0–11.0 | Balance | 1.0–1.8 | 1.0 | 0.05 |
| Cu-Ni 70/30 | 1.0 | 29.0–33.0 | Balance | 0.40–1.0 | 1.0 | 0.05 |
Mechanical properties (minimum, room temperature)
| Grade | Tensile strength | Yield strength (0.2 %) | Elongation | Note |
|---|---|---|---|---|
| Cu-Ni 90/10 | 275 MPa (40 ksi) | 105 MPa (15 ksi) | — | Seawater systems |
| Cu-Ni 70/30 | 360 MPa (52 ksi) | 125 MPa (18 ksi) | — | Higher velocity |
Values are minimums and limits from the governing ASTM / ASME specifications, summarised for convenience. The current edition of the specification takes precedence; confirm requirements against your project specification.
Where it is used
- Ship and naval seawater cooling, ballast and firemain systems
- Offshore platform seawater and firewater
- Desalination and condenser cooling
- Hydraulic and instrumentation lines
Testing & certification
- Chemistry and mechanical tests per specification
- Hydrostatic testing of fabricated assemblies
- Dimensional inspection to EEMUA 145 / 146 or drawing
- Inspection by the shipyard or classification agency when specified
Copper-Nickel products we manufacture
All products
01OEM manufacturerWeld Neck Flanges
ASME B16.5 · ASME B16.47
02OEM manufacturerBlind Flanges
ASME B16.5 · ASME B16.47
03OEM manufacturerSlip-On Flanges
ASME B16.5 · EN 1092-1 Type 12
04OEM manufacturerButt Weld Elbows
ASME B16.9 · ASME B16.25
05OEM manufacturerButt Weld Tees
ASME B16.9 · ASME B16.25
06OEM manufacturerWeldolets & Sockolets
MSS SP-97 · ASME B16.11
Industries and projects
Defence, Shipbuilding & Marine
Where Copper-Nickel is specified
ViewIndustryWater Treatment & Desalination
Where Copper-Nickel is specified
ViewIndustryOil & Gas
Where Copper-Nickel is specified
ViewProjectsMega-projects & EPC supply
Project BOQs, shutdowns and annual rate contracts
ViewOther materials
Copper-Nickel by product
FAQ
Copper-Nickel: common questions
What is the difference between Cu-Ni 90/10 and 70/30?
90/10 (C70600) contains about 10 % nickel and is the usual choice for seawater systems. 70/30 (C71500) has about 30 % nickel, higher strength and better resistance to higher flow velocities and polluted water.
Which standards are used for copper-nickel flanges?
Copper-nickel flanges and fittings for marine use are commonly made to EEMUA 145 (flanges) and EEMUA 146 (fittings) dimensions, with pipe to ASTM B466 / B467, or to naval and shipyard drawings.
Why is copper-nickel used on ships?
It resists seawater corrosion and naturally discourages marine growth, which keeps cooling and firemain systems clean and reliable over long service lives.
Can Teshi Group supply copper-nickel to shipyard drawings?
Yes. Copper-nickel flanges, fittings and spools are made to shipyard or naval drawings and inspected by the yard or the classification agency named in the order.
Copper-nickel (Cu-Ni) grade data sheets
Copper-nickel (Cu-Ni) overview →Chemical composition, mechanical properties and PDF data sheet for each grade.
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