Cupro-Nickel 90/10 & 70/30 Flanges
Teshi Group manufactures Cupro-Nickel 90/10 & 70/30 flanges (CuNi10Fe1Mn, CuNi30Mn1Fe, C70600 / C71500, EEMUA 145) as an OEM in India — forged, machined, marked and certified in-house to ASME B16.5, ASME B16.47, EN 1092-1 and customer drawings.
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.
Cupro-Nickel 90/10 & 70/30 flanges at a glance
| Material | Cupro-Nickel 90/10 & 70/30 |
|---|---|
| Specification | EEMUA 145 / to drawing / EEMUA 145 / to drawing |
| UNS / W.Nr. | C70600 / 2.0872 · C71500 / 2.0882 |
| Sizes | NPS ½"–24" (ASME B16.5), 26"–60" (ASME B16.47 A / B), DN 10–600 (EN 1092-1) |
| Pressure class | Class 150, 300, 600, 900, 1500, 2500 · PN 6–40 |
| Facing / ends | RF, FF, RTJ, tongue & groove, male-female; serrated or smooth finish |
| Certification | EN 10204 3.1 standard · 3.2 with third-party inspection · IBR on request |
| Testing | PMI, hardness, dimensional; UT, IGC, impact and ferrite as specified |
Cupro-Nickel 90/10 & 70/30 chemistry and mechanical properties
Chemical composition of Cupro-Nickel 90/10 & 70/30 (weight %, maximum unless a range)
| 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 of Cupro-Nickel 90/10 & 70/30 (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 |
Matching specifications by product form
| 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 |
Limits and minimums from the governing ASTM / ASME specifications, summarised for convenience; the current edition takes precedence.
Pressure rating
Copper-nickel flanges are rated to EEMUA 145 or the vessel / class-society specification. The applicable rating table is issued with every quotation, and flanges are marked with class, material and heat number.
Types we manufacture
Dimension charts
Where Cupro-Nickel 90/10 & 70/30 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
FAQ
Cupro-Nickel 90/10 & 70/30 flanges: common questions
What specification covers Cupro-Nickel 90/10 & 70/30 flanges?
Cupro-Nickel 90/10 & 70/30 flanges are forged to EEMUA 145 / to drawing / EEMUA 145 / to drawing and dimensioned to ASME B16.5, ASME B16.47 or EN 1092-1.
What is the chemical composition of Cu-Ni 90/10?
Cu-Ni 90/10 (UNS C70600): Mn 1.0, Ni 9.0–11.0, Cu Balance, Fe 1.0–1.8, Zn 1.0, Pb 0.05 (weight %; single values are maximums).
What are the minimum mechanical properties of Cu-Ni 90/10?
Tensile strength 275 MPa (40 ksi), yield strength 105 MPa (15 ksi).
Is Teshi Group a manufacturer of Cupro-Nickel 90/10 & 70/30 flanges in India?
Yes. Teshi Group has manufactured flanges and fittings in India since 1971 and is ISO 9001:2015 certified and IBR approved. Every Cupro-Nickel 90/10 & 70/30 piece is hard-stamped with its heat number and supplied with an EN 10204 3.1 certificate; 3.2 with third-party inspection on request.
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.
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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