Copper Pipes, Tubes, Coils & Fittings
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Copper Nickel Fittings (Cu-Ni 90/10 & 70/30)
Product Overview
Copper Nickel Fittings (Cu-Ni 90/10 & 70/30) supplied by R V Metal Corporation are engineered for high-performance fluid handling systems operating in aggressive environments such as seawater, brine, and corrosive industrial media. These fittings offer exceptional resistance to seawater corrosion, biofouling, erosion, and stress corrosion cracking, making them a preferred choice for marine, offshore, desalination, shipbuilding, and heat exchanger applications. Manufactured with precise dimensional control and metallurgical consistency, Cu-Ni fittings ensure leak-free joints, long service life, and compatibility with copper nickel pipes and tubes. Available in elbows, tees, reducers, couplings, flanges, and custom-fabricated configurations, these fittings deliver reliable performance under high pressure, elevated temperatures, and continuous flow conditions.
Technical Specifications
| Parameter | Cu-Ni 90/10 Fittings | Cu-Ni 70/30 Fittings |
|---|---|---|
| Material Composition | Cu ~88.6–90%, Ni ~9–11%, Fe ~1.0–1.8%, Mn ≤1.0% | Cu ~66–70%, Ni ~29–33%, Fe ~0.4–1.0%, Mn ≤1.0% |
| UNS Designation | C70600 | C71500 |
| Manufacturing Process | Wrought / Seamless / Forged / Fabricated | Wrought / Seamless / Forged / Fabricated |
| Applicable Standards | ASTM B122, ASTM B151, ASTM B466, EN 12451, BS 2871 | ASTM B122, ASTM B151, ASTM B466, EN 12451, BS 2871 |
| Dimensional Standards | ASME B16.9, ASME B16.28, ASME B16.5 | ASME B16.9, ASME B16.28, ASME B16.5 |
| Fitting Types | Elbows, Tees, Reducers, Caps, Stub Ends, Flanges | Elbows, Tees, Reducers, Caps, Stub Ends, Flanges |
| Pressure Rating | As per ASME class (150–2500) depending on size & wall thickness | As per ASME class (150–2500) depending on size & wall thickness |
| Temperature Range | -196°C to +300°C | -196°C to +300°C |
| Mechanical Strength (Typical) | UTS ~275 MPa, YS ~105 MPa | UTS ~360 MPa, YS ~150 MPa |
| Corrosion Resistance | Excellent seawater & biofouling resistance | Superior erosion & high-velocity seawater resistance |
| Flow Velocity Suitability | Moderate flow marine systems | High-velocity & high-pressure marine systems |
| Heat Treatment Condition | Annealed / Stress Relieved | Annealed / Stress Relieved |
| Weldability | Excellent (GTAW / GMAW recommended) | Excellent (controlled heat input recommended) |
| Surface Finish | As fabricated / Pickled / Shot blasted | As fabricated / Pickled / Shot blasted |
| Inspection & Testing | Visual, Dimensional, Eddy Current, UT, Hydrostatic | Visual, Dimensional, Eddy Current, UT, Hydrostatic |
| Certification | EN 10204 3.1 / 3.2 (on request) | EN 10204 3.1 / 3.2 (on request) |
| Typical Applications | Seawater piping, condensers, heat exchangers | Naval vessels, offshore platforms, desalination plants |
Chemical Composition
| Element | Cu-Ni 90/10 Fittings (UNS C70600) |
Cu-Ni 70/30 Fittings (UNS C71500) |
|---|---|---|
| Copper (Cu) | Balance (88.6 – 90.0%) | Balance (66.0 – 70.0%) |
| Nickel (Ni) | 9.0 – 11.0% | 29.0 – 33.0% |
| Iron (Fe) | 1.0 – 1.8% | 0.4 – 1.0% |
| Manganese (Mn) | ≤ 1.0% | ≤ 1.0% |
| Zinc (Zn) | ≤ 1.0% | ≤ 0.5% |
| Lead (Pb) | ≤ 0.02% | ≤ 0.02% |
| Sulphur (S) | ≤ 0.02% | ≤ 0.02% |
| Carbon (C) | ≤ 0.05% | ≤ 0.05% |
| Phosphorus (P) | ≤ 0.02% | ≤ 0.02% |
| Total Other Elements | ≤ 0.5% | ≤ 0.5% |
UNS Codes & Grades
| Alloy Type | UNS Designation | Common Grade Name | ASTM Specification | EN / DIN Equivalent | Typical Product Form |
|---|---|---|---|---|---|
| Copper Nickel 90/10 | C70600 | CuNi 90/10 | ASTM B466 / B467 | EN CW352H DIN 2.0872 |
Elbows, Tees, Reducers, Flanges, Forged Fittings |
| Copper Nickel 90/10 (Low Iron) | C70620 | CuNi 90/10 LF | ASTM B466 | EN CW353H | Precision Marine & Instrumentation Fittings |
| Copper Nickel 70/30 | C71500 | CuNi 70/30 | ASTM B466 / B467 | EN CW354H DIN 2.0882 |
High-Pressure Marine & Offshore Fittings |
| Copper Nickel 70/30 (Controlled Fe) | C71640 | CuNi 70/30 Enhanced | ASTM B466 | EN CW354H (Modified) | Naval, Seawater Cooling & Desalination Fittings |
Mechanical, Physical & Fabrication Properties
| Property | Cu-Ni 90/10 (UNS C70600) | Cu-Ni 70/30 (UNS C71500) | Remarks (Engineering Use) |
|---|---|---|---|
| Tensile Strength (MPa) | 320 – 380 | 360 – 440 | 70/30 preferred for higher pressure & velocity |
| Yield Strength (0.2% Proof) (MPa) | 110 – 150 | 140 – 180 | Forged fittings show higher yield than pipes |
| Elongation (%) | 30 – 40 | 25 – 35 | High ductility aids cold bending & vibration resistance |
| Hardness (HB) | 80 – 100 | 95 – 120 | Increases after cold work / forging |
| Density (g/cm³) | 8.94 | 8.95 | Practically identical for weight calculations |
| Modulus of Elasticity (GPa) | 150 | 160 | Lower than steel → better vibration damping |
| Thermal Conductivity (W/m·K) | 50 | 40 | 90/10 better for heat exchangers |
| Coefficient of Thermal Expansion (µm/m·°C) | 16.5 | 16.0 | Important for flange & expansion loop design |
| Electrical Resistivity (µΩ·cm) | 18 – 20 | 21 – 23 | Higher resistivity = lower galvanic risk |
| Maximum Seawater Velocity (m/s) | 3.0 – 3.5 | 4.0 – 4.5 | Critical for erosion-corrosion control |
| Corrosion Resistance | Excellent | Outstanding | 70/30 superior in polluted & fast-flow seawater |
| Stress Corrosion Cracking | Immune | Immune | Major advantage over brasses |
| Weldability | Excellent (GTAW / GMAW) | Excellent (GTAW / GMAW) | Matching filler metals mandatory |
| Brazing / Soldering | Good | Limited | Usually avoided in marine critical systems |
| Machinability | Moderate | Moderate-Low | Use sharp carbide tools, low feed |
| Hot Forging Suitability | Good | Very Good | 70/30 preferred for forged fittings |
| Cold Workability | Excellent | Good | 90/10 easier for tight bends |
| Typical Service Temperature (°C) | -50 to 300 | -50 to 350 | Mechanical properties stable at temperature |
Common Names & International Identifiers
| Alloy | Common / Trade Names | UNS No. | EN / DIN Designation | ASTM / ASME Reference | ISO / Other Identifiers | Typical Use Reference |
|---|---|---|---|---|---|---|
| Cu-Ni 90/10 | 90/10 Copper Nickel, Cupronickel 90/10 | C70600 | EN CW352H DIN CuNi10Fe1Mn |
ASTM B466 / B467 ASME SB466 |
ISO CuNi10Fe1Mn | Heat exchanger fittings, seawater piping |
| Cu-Ni 70/30 | 70/30 Copper Nickel, Cupronickel 70/30 | C71500 | EN CW354H DIN CuNi30Mn1Fe |
ASTM B466 / B467 ASME SB466 |
ISO CuNi30Mn1Fe | High-velocity seawater, naval & offshore systems |
| Marine Grade Cu-Ni | Marine Copper Nickel, Naval Cu-Ni Alloy | C70600 / C71500 | EN CW352H / CW354H | ASTM B466 (Forged) ASTM B62 (Cast) |
ISO 9722 | Shipbuilding, desalination plants |
| Forged Cu-Ni Fittings | Forged Copper Nickel Fittings | C70600 / C71500 | EN 12165 | ASTM B466 | ISO 9722 | Critical pressure piping & manifolds |
| Cast Cu-Ni Fittings | Cast Copper Nickel Fittings | C96200 / C96400 | EN 1982 | ASTM B62 / B369 | ISO 428 | Valve bodies, low-stress housings |
Standards & International Equivalents
| Product Form | Alloy | ASTM / ASME | EN / DIN | ISO | BS | JIS | Remarks / Scope |
|---|---|---|---|---|---|---|---|
| Forged Fittings | Cu-Ni 90/10 | ASTM B466 ASME SB466 |
EN 12165 (CW352H) DIN CuNi10Fe1Mn |
ISO 9722 | BS 2874 | JIS H3250 | High-pressure piping, marine & heat exchanger systems |
| Forged Fittings | Cu-Ni 70/30 | ASTM B466 ASME SB466 |
EN 12165 (CW354H) DIN CuNi30Mn1Fe |
ISO 9722 | BS 2874 | JIS H3250 | Naval, offshore, high-velocity seawater applications |
| Cast Fittings | Cu-Ni 90/10 | ASTM B62 ASTM B369 |
EN 1982 (CC330G) | ISO 428 | BS 1400 | JIS H5120 | Valve bodies, low-stress fittings, pump casings |
| Cast Fittings | Cu-Ni 70/30 | ASTM B62 ASTM B369 |
EN 1982 (CC333G) | ISO 428 | BS 1400 | JIS H5120 | Marine valves, condenser components |
| Pipe Fittings (Dimensional) | 90/10 & 70/30 | ASME B16.9 ASME B16.11 |
EN 10253 | ISO 3419 | BS 1640 | JIS B2311 | Elbows, tees, reducers – dimensional conformity |
| Flanged Fittings | 90/10 & 70/30 | ASME B16.5 ASME B16.47 |
EN 1092-1 | ISO 7005 | BS 4504 | JIS B2220 | Pipe connection interfaces |
Applications
| Industry / Sector | Typical Systems | Preferred Alloy | Key Reason for Selection | Common Fitting Types Used |
|---|---|---|---|---|
| Marine & Shipbuilding | Seawater piping, ballast systems, bilge lines | Cu-Ni 90/10 | Excellent resistance to seawater corrosion and biofouling | Elbows, tees, reducers, flanges |
| Naval & Defence | High-velocity seawater, fire main systems | Cu-Ni 70/30 | Superior strength and erosion resistance at high flow velocities | Heavy-duty elbows, forged tees, long-radius bends |
| Offshore Platforms | Cooling water, utility water, splash-zone piping | Cu-Ni 70/30 | Outstanding resistance to chloride stress and cavitation | Forged fittings, flanged joints |
| Power Plants | Condenser water circuits, cooling towers | Cu-Ni 90/10 | Long service life in low to medium velocity seawater | Reducers, return bends, flanges |
| Desalination Plants | Intake lines, brine discharge systems | Cu-Ni 70/30 | High resistance to erosion-corrosion and saline media | Elbows, tees, long-radius bends |
| Oil & Gas (Onshore) | Fire water systems, cooling water networks | Cu-Ni 90/10 | Corrosion resistance with good fabricability | Butt-weld fittings, flanges |
| Heat Exchangers & Condensers | Tube sheets, inlet & outlet piping | Cu-Ni 90/10 & 70/30 | Excellent thermal conductivity and corrosion resistance | Reducers, short-radius elbows |
| Ship Repair & Retrofit | Replacement of steel or brass piping | Cu-Ni 90/10 | Compatibility with existing Cu-Ni pipe systems | Standard elbows, tees, couplings |
| Chemical Processing | Salt solutions, brine handling lines | Cu-Ni 70/30 | Resistance to aggressive chloride environments | Forged fittings, flanged connections |
| Industrial Utilities | Cooling water, process water circulation | Cu-Ni 90/10 | Low maintenance and long operational life | Elbows, tees, reducers |
Standard Copper Nickel Fittings (Cu-Ni 90/10 & 70/30) Dimensional Chart
| Standard Copper Nickel Fittings (Cu-Ni 90/10 & 70/30) – Dimensional Chart (All Types) | |||||||
|---|---|---|---|---|---|---|---|
| Fitting Type | Connection / End | Standard / Dimension Basis | Size Range (NPS / DN) | Schedule / Wall Class | Key Dimensions (Typical) | Typical Manufacturing | Notes (Engineer Use) |
| 90° Elbow (LR) | Butt Weld (BW) | ASME B16.9 / MSS SP-75 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Center-to-End (A), OD, WT | Wrought / Seamless / Fabricated | LR preferred to reduce erosion in seawater lines |
| 90° Elbow (SR) | Butt Weld (BW) | ASME B16.9 | 1/2"–12" (DN 15–300) | Sch 10 / 20 / 40 / 80 | Center-to-End (A), OD, WT | Wrought / Fabricated | Use only where space is tight; higher erosion risk at velocity |
| 45° Elbow | Butt Weld (BW) | ASME B16.9 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Center-to-End (A), OD, WT | Wrought / Fabricated | Preferred for smoother flow transitions |
| 180° Return Bend (LR) | Butt Weld (BW) | ASME B16.9 | 1/2"–16" (DN 15–400) | Sch 10 / 20 / 40 / 80 | Center-to-Center (O), OD, WT | Wrought / Fabricated | Used in cooling water loops and condensers |
| Equal Tee | Butt Weld (BW) | ASME B16.9 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Center-to-End (C/M), OD, WT | Wrought / Fabricated | Branch sizing must respect velocity + pressure drop limits |
| Reducing Tee | Butt Weld (BW) | ASME B16.9 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Run (C), Branch (M), OD, WT | Wrought / Fabricated | Specify branch OD/WT explicitly to avoid mix-ups |
| Concentric Reducer | Butt Weld (BW) | ASME B16.9 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Length (H), Large/Small OD, WT | Wrought / Fabricated | Best for vertical lines / pump discharge transitions |
| Eccentric Reducer | Butt Weld (BW) | ASME B16.9 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Length (H), Offset, OD, WT | Wrought / Fabricated | Preferred at pump suction to prevent air pockets |
| End Cap | Butt Weld (BW) | ASME B16.9 | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | OD, WT, Cap Height | Wrought / Fabricated | Use with corrosion allowance if specified by consultant |
| Stub End (Lap Joint) | Butt Weld (BW) | ASME B16.9 / ASME B16.5 (flange match) | 1/2"–24" (DN 15–600) | Sch 10 / 20 / 40 / 80 | Length (F), OD, WT | Wrought / Fabricated | Used with lap joint flanges for easier alignment |
| Union | Threaded / Socket Weld | ASME B16.11 / MSS SP-83 | 1/8"–4" (DN 6–100) | Class 2000 / 3000 / 6000 | Overall Length, Thread/Socket dims | Forged | Use forged for critical systems; avoid cheap cast unions |
| Coupling (Full / Half) | Socket Weld / Threaded | ASME B16.11 | 1/8"–4" (DN 6–100) | Class 3000 / 6000 | Length, Socket Depth / Thread | Forged | Socket weld preferred for leak-tight marine service |
| Reducer Coupling | Socket Weld / Threaded | ASME B16.11 | 1/8"–4" (DN 6–100) | Class 3000 / 6000 | Length, Socket Depth / Thread | Forged | Specify both ends clearly (NPS x NPS) to avoid mismatch |
| 90° Elbow | Socket Weld / Threaded | ASME B16.11 | 1/8"–4" (DN 6–100) | Class 3000 / 6000 | Center-to-End, Socket/Thread | Forged | Best for compact skid piping; avoid SR BW elbows at high velocity |
| Tee (Equal / Reducing) | Socket Weld / Threaded | ASME B16.11 | 1/8"–4" (DN 6–100) | Class 3000 / 6000 | Center-to-End, Socket/Thread | Forged | Branch reinforcement must meet design pressure |
| Cross | Socket Weld / Threaded | ASME B16.11 | 1/8"–2" (DN 6–50) | Class 3000 / 6000 | Center-to-End, Socket/Thread | Forged | Used in instrumentation / sampling lines |
| Nipple | Threaded | ASME B16.11 / ASTM pipe basis | 1/8"–4" (DN 6–100) | Sch 40 / 80 | Length (L), Thread Length | Machined from pipe/bar | Provide thread standard: NPT / BSP / BSPT |
| Flange (Weld Neck) | Butt Weld | ASME B16.5 / ASME B16.47 | 1/2"–24" (DN 15–600) | Class 150 / 300 / 600 / 900 | OD, Bolt Circle, Bore, RTJ/RF/FF | Forged | Preferred for critical marine lines; best fatigue performance |
| Flange (Slip On) | Fillet Weld | ASME B16.5 | 1/2"–24" (DN 15–600) | Class 150 / 300 | OD, Bolt Circle, Bore | Forged | Economic; use where cyclic loads are low |
| Flange (Lap Joint) | With Stub End | ASME B16.5 | 1/2"–24" (DN 15–600) | Class 150 / 300 | OD, Bolt Circle | Forged | Easy alignment; good for maintenance-intensive lines |
| Flange (Blind) | Bolt-on | ASME B16.5 | 1/2"–24" (DN 15–600) | Class 150 / 300 / 600 | OD, Bolt Circle, Thickness | Forged | Used for isolation, hydrotest, or future tie-ins |
| Flange (Threaded) | Threaded | ASME B16.5 | 1/2"–4" (DN 15–100) | Class 150 / 300 | OD, Bolt Circle, Thread Spec | Forged | Avoid in vibration-heavy areas; specify thread standard |
