Copper Nickel Pipe Fittings for Seawater & Marine Piping
Copper nickel is one of those materials people don’t think about until they’ve been burned by the alternative. We’ve had customers come to us after a stainless system started pitting within a couple of years of seawater service, wanting to know why nobody mentioned copper nickel the first time around. The short answer: it builds its own protective film in seawater, and that film happens to keep most marine growth from sticking to the pipe wall too. Nobody designed it to do that on purpose it’s just how the chemistry works out. We manufacture copper nickel pipe fittings in 90/10 (UNS C70600) and 70/30 (UNS C71500) out of our Mumbai unit, to ASTM B466, sized per ASME B16.9 and B16.28. Most projects end up on 90/10 it welds easily, resists corrosion well enough for general seawater service, and costs less. 70/30 comes into play when flow velocity is higher than usual and erosion-corrosion becomes a real concern rather than a theoretical one. Every batch ships with EN 10204 3.1 paperwork, because that’s what actually gets checked when a class society asks questions three years after installation, not before. Know your grade already? Send the size list. Not sure? Ask us before you order, not after.
Table of content
- What Copper Nickel Pipe Fittings Actually Is
- Grade Selection Guide: 90/10 or 70/30?
- Types Of Copper Nickel Pipe Fittings
- Copper Nickel Pipe Fittings Manufacturing Specification
- Copper Nickel Pipe Fittings Chemical Composition by Grade (%)
- Copper Nickel Pipe Fittings Mechanical & Physical Data
- Sizing, Dimension & Weight Reference
- Where This Alloy Actually Gets Used
- Copper Nickel Pipe Fittings Marine & Offshore Compliance
- Why Buyers Keep Coming Back to Us
- People Ask About Copper Nickel Pipe Fittings Suppliers
What Copper Nickel Pipe Fittings Actually Is
Copper nickel — cupronickel, if you want the metallurgist’s word for it — is mostly copper with nickel added in, plus small amounts of iron and manganese to stabilize the alloy and improve resistance to erosion. The two grades that show up in almost every marine spec are 90/10 (90% copper, 10% nickel, UNS C70600) and 70/30 (70% copper, 30% nickel, UNS C71500). Both build the same protective oxide film in seawater; 70/30 just does it more robustly, which is why it shows up in higher-velocity lines and more demanding offshore duty while 90/10 covers general seawater piping at a friendlier price.
Fitting Types We Produce
- 90° & 45° elbows (long and short radius)
- 180° return bends
- equal and reducing tees
- concentric and eccentric reducers
- stub ends (long and short pattern)
- end caps
- equal and unequal crosses
- pipe bends in 1D–10D radii
- socket-weld and threaded fittings — couplings, unions, nipples, plugs
Grade Selection Guide: 90/10 or 70/30?
This is the single most common question we get, so we’re putting it early rather than burying it at the bottom of the page:
Factor | Copper Nickel 90/10 (C70600) | Copper Nickel 70/30 (C71500) |
|---|---|---|
Nickel Content | 9 – 11% | 29 – 33% |
Corrosion Resistance | Very good in general seawater service | Superior, especially at higher flow velocities |
Erosion-Corrosion Resistance | Good | Better — preferred where flow rates are higher |
Weldability | Excellent, easier to fabricate | Good, slightly more demanding to weld |
Relative Cost | Lower | Higher, due to nickel content |
Typical Use | General seawater piping, condensers, ballast lines | High-velocity lines, critical offshore service |
Our honest take: if the line is standard seawater service without unusual flow velocities, 90/10 does the job at a better price. Step up to 70/30 when erosion-corrosion or higher-velocity flow is genuinely part of the picture — not as a default safety margin.
Both grades are stocked as part of our Copper Nickel 90/10 pipe fittings and Copper Nickel 70/30 pipe fittings ranges, so switching grades mid-order doesn’t mean switching vendors.
Types Of Copper Nickel Pipe Fittings
Copper Nickel Pipe Fittings Manufacturing Specification
Parameter | Details |
|---|---|
Governing Specification | ASTM B466 / ASME SB466 (also B467, B151, B62 for related product forms) |
Grades | Copper Nickel 90/10 (UNS C70600), Copper Nickel 70/30 (UNS C71500) |
Equivalent Designation | Werkstoff 2.0872 (90/10), Werkstoff 2.0882 (70/30) |
Size Range | 1/2″ NB to 48″ NB |
Thickness | SCH 10 to SCH XXS |
Construction | Seamless / Welded / Fabricated |
Dimensional Standards | ASME B16.9, ASME B16.28, MSS-SP-43, BS4504, BS1560, BS10, DIN 86090 |
Bending Radius | R = 1D, 2D, 3D, 5D, 6D, 8D, 10D, or custom on drawing |
End Finish | Beveled for welding, threaded (NPT/BSP), or socket-weld |
Testing Performed | Hydrostatic test, PMI, ultrasonic and radiography testing, pitting resistance test |
Copper Nickel Pipe Fittings Chemical Composition by Grade (%)
Element | 90/10 (C70600) | 70/30 (C71500) |
|---|---|---|
Copper (Cu) | 88.6 min | 65.0 min |
Nickel (Ni) | 9 – 11 | 29 – 33 |
Iron (Fe) | 1.8 max | 0.4 – 1.0 |
Manganese (Mn) | 1.0 max | 1.0 max |
Zinc (Zn) | 1.0 max | 1.0 max |
Lead (Pb) | 0.05 max | 0.05 max |
Copper Nickel Pipe Fittings Mechanical & Physical Data
Property | 90/10 | 70/30 |
|---|---|---|
Tensile Strength | 50,000 psi (~300 N/mm²) | 50,000 psi (~350 N/mm²) |
Yield Strength (0.2% offset) | 20,000 psi (~100 N/mm²) | 20,000 psi (~120 N/mm²) |
Elongation | 30% | 35% |
Hardness (Hv) | 90 | 100 |
Density | 0.323 lb/in³ at 68°F | 0.323 lb/in³ at 68°F |
Melting Point | 2260°F (1238°C) | 2260°F (1238°C) |
Thermal Conductivity | 45.0 W/m·K at 20°C | ~29.0 W/m·K at 20°C |
Sizing, Dimension & Weight Reference
ASME B16.9 Dimensions (90/10 Grade, Select Sizes)
NPS (inch) | O.D. (mm) | 90° LR Elbow C-to-F (in) | 45° LR Elbow C-to-F (in) | 180° Return C-to-C (in) |
|---|---|---|---|---|
1/2 | 21.3 | 1 1/2 | 5/8 | 1 7/8 |
1 | 33.4 | 1 1/2 | 7/8 | 2 3/16 |
2 | 60.3 | 3 | 1 3/8 | 6 |
4 | 114.3 | 6 | 2 1/2 | 12 |
6 | 168.3 | 9 | 3 3/4 | 18 |
8 | 219.1 | 12 | 5 | 24 |
12 | 323.9 | 18 | 7 1/2 | 36 |
Approximate Weight — Schedule 40S (kg per piece)
DN | 90° Elbow | 45° Elbow | Equal Tee |
|---|---|---|---|
15 | 0.03 | 0.02 | 0.09 |
25 | 0.08 | 0.03 | 0.28 |
40 | 0.17 | 0.11 | 0.68 |
50 | 0.25 | 0.17 | 0.85 |
80 | 0.63 | 0.30 | 1.77 |
100 | 1.08 | 0.50 | 3.46 |
150 | 2.72 | 1.28 | 8.07 |
200 | 5.33 | 2.19 | 15.65 |
300 | 13.62 | 6.55 | 39.46 |
Full charts up to 48″ NB, plus tolerance tables, ship in our downloadable technical PDF.
Copper Nickel Elbow (per unit)
Size | Price in USD | Price in AED |
|---|---|---|
15mm | $1.25 | 4.59 |
25mm | $8.15 | 29.93 |
50mm | $16.76 | 61.56 |
100mm | $42.58 | 156.40 |
150mm | $90.40 | 332.04 |
250mm | $319.99 | 1175.32 |
Copper Nickel Tee (per unit)
Size | Price in USD | Price in AED |
|---|---|---|
1/2″ | $4.49 | 16.49 |
1″ | $3.70 | 13.59 |
2″ | $7.93 | 29.13 |
4″ | $27.31 | 100.31 |
6″ | $60.70 | 222.95 |
Copper Nickel Reducer (per unit)
Size | Price in USD | Price in AED |
|---|---|---|
3/4″ x 1/2″ | $3.99 | 14.66 |
2″ x 1 1/2″ | $2.58 | 9.48 |
4″ x 2″ | $9.58 | 35.19 |
6″ x 3″ | $16.88 | 62.00 |
6″ x 5″ | $17.65 | 64.83 |
These are indicative figures that move with schedule, construction type, and order quantity. Send your actual size list for firm pricing.
Where This Alloy Actually Gets Used
- shipbuilding and marine piping systems
- offshore platforms and subsea pipelines
- desalination and seawater intake plants
- power plant condensers and heat exchangers
- oil and gas piping in coastal or offshore installations
- chemical and petrochemical process lines exposed to brine
- ballast and firefighting piping systems on vessels
If chlorides rather than pure seawater exposure are the dominant concern, it’s also worth comparing against our Duplex Steel S31803/S32205 pipe fittings — a different alloy family entirely, but one that turns up in a lot of the same offshore and marine bids, and occasionally wins on cost depending on the fluid chemistry.
Copper Nickel Pipe Fittings Marine & Offshore Compliance
Copper nickel fittings almost always end up on a vessel or an offshore structure, which means class society approval and NACE compliance aren’t optional extras — they’re usually the reason the enquiry exists in the first place. We work to:
- NACE MR0175 / MR0103 sour service compliance where the piping carries hydrocarbons alongside seawater
- EN 10204 3.1 and 3.2 mill test certification, matched to the level your client or class society specifies
- Third-party inspection through Lloyds, TUV, or Bureau Veritas, arranged before dispatch rather than after a rejection
- HIC (hydrogen-induced cracking) testing on request for sour or brackish service
If your project has a specific class society requirement (DNV, ABS, BV, etc.), flag it at the inquiry stage — it changes what documentation we prepare, not what fitting we supply.
Why Buyers Keep Coming Back to Us
- Factory-direct pricing, with no trading-house markup added in between
- Ready stock across copper nickel, duplex, stainless, and nickel-alloy ranges
- In-house PMI, hydrostatic, and pitting-resistance testing before anything ships
- Custom fabrication and bend radius made to your drawing, not just catalogue sizes
- Dispatch from Mumbai — JNPT/Nhava Sheva and Mundra ports — usually within 7–15 days
- A dedicated export documentation team that handles LC terms, class society approvals and NACE compliance
People Ask About Copper Nickel Pipe Fittings Suppliers
Copper Nickel Pipe Fittings are corrosion-resistant fittings made from copper and nickel alloys, available in 90/10 and 70/30 compositions, suitable for marine, chemical, and industrial piping systems.
Common types include elbows (90° and 45°), tees, reducers (concentric and eccentric), crosses, end caps, and stub ends.
70/30 Cu-Ni has higher nickel content for superior corrosion resistance and strength, while 90/10 Cu-Ni is ideal for moderate strength and standard marine applications.
These fittings are widely used in marine, oil & gas, power plants, chemical, petrochemical, and industrial manufacturing.