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Copper Nickel Flanges (Cu-Ni 90/10 & 70/30)
Product Overview
Copper Nickel Flanges (Cu-Ni 90/10 & 70/30) from R V Metal Corporation are engineered for seawater, marine, offshore and shipbuilding piping systems where long-term corrosion resistance, reliability and low maintenance are critical. Cu-Ni flanges offer excellent resistance to biofouling and erosion-corrosion in flowing seawater, making them a preferred choice for condensers, heat exchangers, ballast lines, fire mains, hydraulic cooling, and saltwater service pipelines. We supply flanges in forged or machined construction with tight dimensional control, compatibility with Cu-Ni pipes/tubes, and full traceability with test certificates. Available in standard pressure classes as well as OEM-specific custom drilling patterns, our flanges support secure gasket seating, stable bolt loading, and dependable leak-free joints in demanding marine environments.
Technical Specifications
| Parameter | Copper Nickel 90/10 (CuNi 90/10) | Copper Nickel 70/30 (CuNi 70/30) |
|---|---|---|
| Material Composition | 90% Copper, 10% Nickel with Fe & Mn additions | 70% Copper, 30% Nickel with Fe & Mn additions |
| UNS Designation | C70600 | C71500 |
| Manufacturing Process | Forged / Machined from solid billet | |
| Flange Types | Slip-On, Weld Neck, Blind, Socket Weld, Lap Joint, Threaded | |
| Pressure Class | ANSI/ASME Class 150, 300, 600, 900, 1500 (on request) | |
| Nominal Size Range | ½” to 48” (DN15 to DN1200) | |
| Temperature Range | -196°C to +300°C | -196°C to +350°C |
| Yield Strength (Typical) | 105–125 MPa | 150–180 MPa |
| Tensile Strength (Typical) | 275–345 MPa | 360–450 MPa |
| Elongation | 30% (min) | 25% (min) |
| Corrosion Resistance | Excellent – Seawater & Brackish Water | Superior – High Velocity Seawater |
| Surface Finish | Machined / Pickled / Shot Blasted / Custom Finish | |
| Facing Type | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) | |
| Drilling Standards | ASME B16.5, B16.47, EN 1092-1, BS 4504, DIN, JIS | |
| Testing & Inspection | Chemical Analysis, Mechanical Tests, Dimensional Inspection | |
| Certification | EN 10204 3.1 / 3.2, IBR, NDT on request | |
| Typical Applications | Marine Piping, Offshore Platforms, Condensers, Heat Exchangers, Shipbuilding | |
Chemical Composition
| Element | Cu-Ni 90/10 (UNS C70600) | Cu-Ni 70/30 (UNS C71500) |
|---|---|---|
| Copper (Cu) | Balance (≈ 88.6 – 90.0%) | Balance (≈ 66.5 – 69.5%) |
| Nickel (Ni) | 9.0 – 11.0% | 29.0 – 33.0% |
| Iron (Fe) | 1.0 – 1.8% | 0.4 – 1.0% |
| Manganese (Mn) | 0.5 – 1.0% | 0.5 – 1.0% |
| Carbon (C) | Max 0.05% | Max 0.05% |
| Silicon (Si) | Max 0.15% | Max 0.15% |
| Phosphorus (P) | Max 0.02% | Max 0.02% |
| Sulfur (S) | Max 0.02% | Max 0.02% |
| Zinc (Zn) | Max 0.5% | Max 0.5% |
| Lead (Pb) | Max 0.02% | Max 0.02% |
UNS Codes & Grades
| Material Type | UNS Code | Common Grade / Alloy Name | Nickel Content | Typical Use in Flanges |
|---|---|---|---|---|
| Copper Nickel 90/10 | C70600 | Cu-Ni 90/10 | 9 – 11% Ni | Seawater piping, condensers, heat exchangers, marine flanges |
| Copper Nickel 90/10 (Forged) | C70620 | Cu-Ni 90/10 Forging Grade | 9 – 11% Ni | Forged flanges, valve bodies, marine fittings |
| Copper Nickel 70/30 | C71500 | Cu-Ni 70/30 | 29 – 33% Ni | High-velocity seawater systems, offshore flanges |
| Copper Nickel 70/30 (Forged) | C71520 | Cu-Ni 70/30 Forging Grade | 29 – 33% Ni | Heavy-duty forged flanges, shipbuilding applications |
| Cast Copper Nickel 90/10 | C96200 | Cast Cu-Ni 90/10 | ≈10% Ni | Cast flanges, pumps, marine components |
| Cast Copper Nickel 70/30 | C96400 | Cast Cu-Ni 70/30 | ≈30% Ni | Cast flanges for seawater and offshore systems |
Mechanical, Physical & Fabrication Properties
| Property | Unit | Copper Nickel 90/10 (C70600 / C70620) | Copper Nickel 70/30 (C71500 / C71520) |
|---|---|---|---|
| Density | g/cm³ | 8.90 | 8.95 |
| Tensile Strength (Annealed) | MPa | 300 – 380 | 380 – 480 |
| Yield Strength (0.2% Proof) | MPa | 120 – 150 | 150 – 200 |
| Elongation | % | 30 – 40 | 25 – 35 |
| Hardness (Annealed) | HB | 80 – 100 | 95 – 120 |
| Elastic Modulus | GPa | 150 | 160 |
| Thermal Conductivity | W/m·K | 50 – 55 | 40 – 45 |
| Electrical Conductivity | % IACS | 12 – 15 | 7 – 9 |
| Coefficient of Thermal Expansion | µm/m·°C | 16.5 | 16.0 |
| Corrosion Resistance | — | Excellent in seawater, biofouling resistant | Outstanding in high-velocity & polluted seawater |
| Machinability | — | Good (use sharp carbide tools) | Moderate (higher cutting forces) |
| Forgeability | — | Excellent (preferred for forged flanges) | Very good (higher forging temperature) |
| Hot Working Range | °C | 750 – 900 | 800 – 950 |
| Cold Workability | — | Good | Fair |
| Weldability | — | Excellent (GTAW / GMAW / SMAW) | Excellent (preheat not required) |
| Recommended Filler Metal | — | ERNiCu-7 / ECuNi | ERNiCu-7 / ECuNi |
| Typical Flange Manufacturing | — | Forged / Machined / Rolled | Forged / Machined (Heavy Duty) |
Common Names & International Identifiers
| Alloy System | Common / Trade Names | UNS Designation | ASTM / ASME | EN / DIN | ISO | BS | JIS | Typical Industry Reference |
|---|---|---|---|---|---|---|---|---|
| Cu-Ni 90/10 |
Copper Nickel 90/10 CuNi10Fe1Mn 90/10 Cupro Nickel Cunifer 10 |
C70600 (Wrought) C70620 (Forgings) |
ASTM B466 (Pipe) ASTM B467 (Tube) ASTM B151 (Plate) ASTM B564 (Forgings) |
EN CW352H | ISO 9722 / ISO 9723 | BS 2871 Part 2 CN102 | JIS C7060 |
Seawater piping Heat exchanger flanges Marine & offshore systems |
| Cu-Ni 70/30 |
Copper Nickel 70/30 CuNi30Mn1Fe 70/30 Cupro Nickel Cunifer 30 |
C71500 (Wrought) C71520 (Forgings) |
ASTM B466 (Pipe) ASTM B467 (Tube) ASTM B151 (Plate) ASTM B564 (Forgings) |
EN CW354H | ISO 9722 / ISO 9723 | BS 2871 Part 2 CN107 | JIS C7150 |
High-velocity seawater Naval & shipbuilding flanges Offshore platforms |
Standards & International Equivalents
| Material Grade | UNS Designation | ASTM / ASME Standards | EN / DIN Standards | ISO Standards | BS Standards | JIS Standards | Typical Product Form | Primary Use / Acceptance |
|---|---|---|---|---|---|---|---|---|
| Cu-Ni 90/10 | C70620 (Forgings) |
ASTM B564 (Forged Flanges) ASTM B466 (Pipe – mating) ASTM B467 (Tube – mating) ASME B16.5 / B16.47 |
EN 12165 CW352H DIN 17664 |
ISO 9722 ISO 9723 |
BS 2872 CN102 BS 4504 |
JIS H3300 C7060 |
Slip-On Flanges Weld Neck Flanges Blind Flanges |
Seawater piping Heat exchangers Marine & offshore systems |
| Cu-Ni 70/30 | C71520 (Forgings) |
ASTM B564 (Forged Flanges) ASTM B466 (Pipe – mating) ASTM B467 (Tube – mating) ASME B16.5 / B16.47 |
EN 12165 CW354H DIN 17664 |
ISO 9722 ISO 9723 |
BS 2872 CN107 BS 4504 |
JIS H3300 C7150 |
Weld Neck Flanges Blind Flanges Custom Machined Flanges |
High-velocity seawater lines Naval shipbuilding Offshore & desalination plants |
Applications
| Industry / Sector | Application Area | Preferred Grade | Reason for Material Selection |
|---|---|---|---|
| Marine & Shipbuilding | Seawater piping systems, ballast lines, cooling circuits | Cu-Ni 70/30 | Superior resistance to seawater corrosion, biofouling, and high flow velocity |
| Offshore Oil & Gas | Fire water systems, seawater lift lines, platform piping | Cu-Ni 70/30 | High strength, erosion resistance, and long service life in aggressive environments |
| Desalination Plants | Brine circulation, seawater intake and discharge systems | Cu-Ni 70/30 | Excellent resistance to chloride stress corrosion and scaling |
| Power Generation | Condenser water lines, cooling water flanges | Cu-Ni 90/10 | Good thermal conductivity with adequate corrosion resistance |
| Heat Exchangers | Shell-and-tube exchanger connections | Cu-Ni 90/10 | Compatibility with Cu-Ni tubes and ease of fabrication |
| Naval Defense | Warship piping, auxiliary seawater systems | Cu-Ni 70/30 | High reliability, low maintenance, and naval-class approval |
| Chemical Processing | Saltwater handling, corrosive fluid transfer | Cu-Ni 90/10 | Resistance to corrosion and chemical attack in saline environments |
| Coastal Infrastructure | Seawater pumping stations, intake manifolds | Cu-Ni 70/30 | Long-term durability in continuously immersed conditions |
Standard Copper Nickel Flanges (Cu-Ni 90/10 & 70/30) Dimensional Chart
| Standard Copper Nickel Flanges (Cu-Ni 90/10 & 70/30) – Dimensional & Type Chart (Reference Table) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Flange Type | Facing | Standard / Series | NPS / DN Range | Pressure Class | Bore / Schedule | Typical Thickness (t) | Drilling (Bolt Circle / Holes) | Typical Use |
| Weld Neck (WN) | RF / FF / RTJ | ASME B16.5 / B16.47 | 1/2"–24" (B16.5), 26"–60" (B16.47) | 150, 300, 600 (up to 2500 by design) | Match pipe SCH (10/20/40/80 etc.) | As per class & size (B16.5) | As per ASME drilling template | Critical lines, cyclic load, high integrity joints |
| Slip-On (SO) | RF / FF | ASME B16.5 | 1/2"–24" | 150, 300, 600 | Standard / as ordered | As per class & size (B16.5) | As per ASME drilling template | Utility seawater, moderate duty, easy fabrication |
| Socket Weld (SW) | RF | ASME B16.5 | 1/2"–3" | 150–1500 | Socket to pipe OD | As per class & size (B16.5) | As per ASME drilling template | Small-bore high-pressure services |
| Threaded (THRD) | RF | ASME B16.5 | 1/2"–4" | 150–600 | NPT / BSP (as specified) | As per class & size (B16.5) | As per ASME drilling template | Non-weld installations, maintenance points | a>
| Lap Joint (LJ) | RF (with stub-end) | ASME B16.5 | 1/2"–24" | 150, 300, 600 | Used with Cu-Ni stub end | As per class & size (B16.5) | As per ASME drilling template | Corrosion services where frequent dismantling is needed |
| Blind (BL) | RF / FF / RTJ | ASME B16.5 | 1/2"–24" | 150–2500 | NA | As per class & size (B16.5) | As per ASME drilling template | Line isolation, hydrotest, end closures |
| Orifice Flange (OF) | RF (meter taps) | ASME B16.36 / B16.5 drilling | 1/2"–24" | 150–2500 | As per meter run design | As per B16.36 | As per ASME + tap location | Flow measurement in Cu-Ni systems |
| Spectacle Blind | RF / FF | ASME B16.48 | 1/2"–24" | 150–600 (higher by design) | NA | As per B16.48 | NA | Positive isolation in seawater systems |
| Paddle Blind / Spacer | RF / FF | ASME B16.48 | 1/2"–24" | 150–600 | NA | As per B16.48 | NA | Isolation where space is limited |
| Ring Type Joint (RTJ) Flange | RTJ | ASME B16.5 | 1/2"–24" | 600–2500 | Match pipe SCH | As per class & size (B16.5) | As per ASME drilling template | High pressure / critical sealing applications |
| Custom / Non-Standard Drilling | RF / FF / RTJ | BS 4504 / EN 1092-1 / JIS / IS (as required) | DN 15–DN 1200 | PN 6/10/16/25/40 (or as specified) | As ordered | As per PN/DN table | As per requested drilling template | Retrofit, export projects, EPC tender compliance |
| Copper Nickel Flange Dimensional Deliverables (What We Supply on Request) | |||||
|---|---|---|---|---|---|
| Parameter | Symbol | Description | Standard Reference | Provided As | Notes |
| Outside Diameter | OD | Flange outer diameter | ASME B16.5 / EN 1092-1 | Dimensional drawing + table | Depends on NPS/DN & class/PN |
| Thickness | t | Flange thickness (or hub thickness for WN) | ASME B16.5 / B16.47 | As per standard | Critical for pressure rating |
| Bolt Circle Diameter | BCD | Pitch circle diameter for bolt holes | ASME drilling template | As per standard | Must match mating flange drilling |
| No. of Bolt Holes | n | Total holes quantity | ASME B16.5 / EN 1092-1 | As per standard | Varies by size/class |
| Bolt Hole Diameter | d | Hole diameter for stud/bolt | ASME B16.5 / EN 1092-1 | As per standard | Typically clearance holes |
| Raised Face Height | RF | Raised face projection | ASME B16.5 | As per standard | Common for gasketed joints |
