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Copper Nickel Sheets (Cu-Ni Alloys) – 90/10, 70/30 & Marine Grades
Product Overview
Copper Nickel Sheets manufactured and supplied by R V Metal Corporation are premium Cu-Ni alloy flat products engineered for demanding marine, offshore, and industrial environments. Available in industry-standard Copper Nickel 90/10 (CuNi 90/10), Copper Nickel 70/30 (CuNi 70/30), and specialized marine grades, these sheets offer exceptional resistance to seawater corrosion, biofouling, erosion, and stress corrosion cracking. The controlled addition of iron and manganese enhances strength and long-term durability, making these alloys the preferred choice for shipbuilding, desalination plants, heat exchangers, condensers, offshore platforms, and coastal infrastructure. R V Metal Corporation supplies Copper Nickel Sheets in a wide range of thicknesses, sizes, and tempers, with options for cut-to-size plates and custom specifications, all backed by certified chemical and mechanical test reports as per international standards such as ASTM, EN, BS, and IS. Designed for high reliability, excellent weldability, and stable performance in aggressive saline environments, these Cu-Ni sheets meet the expectations of EPC contractors, marine consultants, and OEMs worldwide.
Technical Specifications
| Parameter | Copper Nickel 90/10 | Copper Nickel 70/30 | Marine Grade Cu-Ni (Fe–Mn Stabilized) |
|---|---|---|---|
| Nominal Composition | Cu ~88–91%, Ni ~9–11% | Cu ~68–71%, Ni ~29–31% | Cu-Ni with controlled Fe & Mn |
| UNS Designation | C70600 | C71500 | C70600 / C71500 (Marine-modified) |
| Standard Specifications | ASTM B122, B171, EN 1652 | ASTM B122, B171, EN 1652 | ASTM B122, BS 2871, EN 1652 |
| Thickness Range | 0.5 mm – 50 mm | 0.5 mm – 50 mm | 0.5 mm – 60 mm |
| Width Range | Up to 2000 mm | Up to 2000 mm | Up to 2500 mm |
| Length | Standard & Cut-to-Length | Standard & Cut-to-Length | Standard & Custom Lengths |
| Temper / Condition | Annealed (O), Stress Relieved | Annealed (O), Stress Relieved | Annealed, Hot Rolled |
| Density | ~8.9 g/cm³ | ~8.95 g/cm³ | ~8.9–9.0 g/cm³ |
| Tensile Strength (Typical) | 310 – 380 MPa | 360 – 450 MPa | 350 – 460 MPa |
| Yield Strength (Typical) | 105 – 150 MPa | 120 – 180 MPa | 120 – 200 MPa |
| Elongation | ≥30% | ≥30% | ≥28% |
| Thermal Conductivity | ~50 W/m·K | ~29 W/m·K | ~30–45 W/m·K |
| Corrosion Resistance | Excellent (Seawater, Brine) | Outstanding (High Velocity Seawater) | Superior (Marine & Offshore) |
| Fabrication | Excellent Formability & Weldability | Good Formability, Excellent Strength | Excellent Weldability & Durability |
| Typical Applications | Heat Exchangers, Condensers | Marine Piping, Desalination | Shipbuilding, Offshore Structures |
| Supply Condition | MTC as per EN 10204 3.1 | MTC as per EN 10204 3.1 | MTC with Full Traceability |
Chemical Composition
| Element | Copper Nickel 90/10 (UNS C70600) |
Copper Nickel 70/30 (UNS C71500) |
Marine Grade Cu-Ni (Fe–Mn Stabilized) |
|---|---|---|---|
| Copper (Cu) | Balance (≈ 88.6 – 90.5%) | Balance (≈ 66.5 – 69.5%) | Balance |
| Nickel (Ni) | 9.0 – 11.0% | 29.0 – 33.0% | As per 90/10 or 70/30 grade |
| Iron (Fe) | 1.0 – 1.8% | 0.4 – 1.0% | 0.6 – 2.0% |
| Manganese (Mn) | 0.5 – 1.0% | 0.5 – 1.0% | 0.5 – 1.5% |
| Zinc (Zn) | Max 0.5% | Max 0.5% | Max 0.5% |
| Lead (Pb) | Max 0.02% | Max 0.02% | Max 0.02% |
| Sulfur (S) | Max 0.02% | Max 0.02% | Max 0.02% |
| Carbon (C) | Max 0.05% | Max 0.05% | Max 0.05% |
| Silicon (Si) | Max 0.10% | Max 0.10% | Max 0.10% |
| Phosphorus (P) | Max 0.02% | Max 0.02% | Max 0.02% |
| Other Impurities | Max 0.5% (Total) | Max 0.5% (Total) | Strictly Controlled |
UNS Codes & Grades
| Alloy Type | UNS Code | ASTM / ASME Designation | EN / DIN Equivalent | ISO Grade | Common Industry Name | Typical Application Focus |
|---|---|---|---|---|---|---|
| Copper Nickel 90/10 | C70600 | ASTM B122 / B171 / B466 | EN CW352H (CuNi10Fe1Mn) | ISO CuNi10Fe1Mn | Cu-Ni 90/10 | Heat exchangers, seawater piping, condensers |
| Copper Nickel 70/30 | C71500 | ASTM B122 / B171 / B466 | EN CW354H (CuNi30Mn1Fe) | ISO CuNi30Mn1Fe | Cu-Ni 70/30 | High-velocity seawater, offshore, naval systems |
| Marine Grade Cu-Ni (90/10 Stabilized) | C70620 | ASTM B122 (Enhanced Fe) | EN CW352H (Modified) | ISO CuNi10Fe1Mn | Marine Cu-Ni 90/10 | Shipbuilding, desalination, coastal installations |
| Marine Grade Cu-Ni (70/30 Stabilized) | C71520 | ASTM B122 (Enhanced Fe) | EN CW354H (Modified) | ISO CuNi30Mn1Fe | Marine Cu-Ni 70/30 | Naval heat exchangers, offshore platforms |
| Low-Iron Cu-Ni 90/10 | C70610 | ASTM B171 | EN CW352H (Low Fe) | ISO CuNi10 | Clean Cu-Ni 90/10 | Precision condensers, clean water systems |
Mechanical, Physical & Fabrication Properties
| Property | Cu-Ni 90/10 (C70600) | Cu-Ni 70/30 (C71500) | Marine Grade Cu-Ni (Stabilized) |
|---|---|---|---|
| Condition / Temper | Annealed (O) | Annealed (O) | Annealed (O) |
| Tensile Strength (MPa) | 300 – 380 | 360 – 450 | 320 – 420 |
| Yield Strength (0.2% Proof, MPa) | 110 – 150 | 140 – 180 | 130 – 170 |
| Elongation (%) | 30 – 40 | 25 – 35 | 28 – 38 |
| Hardness | 80 – 100 HB | 100 – 120 HB | 90 – 110 HB |
| Density (g/cm³) | 8.94 | 8.95 | 8.94 – 8.96 |
| Melting Range (°C) | 1100 – 1130 | 1170 – 1240 | 1100 – 1200 |
| Thermal Conductivity (W/m·K) | 50 – 60 | 35 – 45 | 40 – 55 |
| Electrical Conductivity (% IACS) | 8 – 10 | 3 – 5 | 5 – 8 |
| Coefficient of Thermal Expansion (µm/m·°C) | 16.5 | 16.0 | 16.2 |
| Cold Workability | Excellent | Good | Good to Excellent |
| Hot Workability | Excellent | Excellent | Excellent |
| Forming / Bending | Very Good (tight radii possible) | Good (larger radii recommended) | Very Good |
| Weldability | Excellent (GTAW, GMAW) | Excellent (GTAW, GMAW) | Excellent (marine-approved fillers) |
| Machinability | Moderate | Moderate to Low | Moderate |
| Erosion-Corrosion Resistance | Very Good | Excellent | Excellent (high-velocity seawater) |
| Biofouling Resistance | High | Very High | Very High |
Common Names & International Identifiers
| Alloy Type | Common / Trade Names | UNS Designation | EN / DIN Designation | ASTM / ASME Identifier | ISO / International Identifier | Typical Industry Reference |
|---|---|---|---|---|---|---|
| Copper Nickel 90/10 | Cupronickel 90/10, Cunifer 90, CuNi10 | C70600 | EN CW352H (CuNi10Fe1Mn) | ASTM B122 / B171 / ASME SB122 | ISO CuNi10Fe1Mn | Heat Exchangers, Condensers, Seawater Piping |
| Copper Nickel 70/30 | Cupronickel 70/30, Cunifer 30, CuNi30 | C71500 | EN CW354H (CuNi30Mn1Fe) | ASTM B122 / B171 / ASME SB122 | ISO CuNi30Mn1Fe | Naval Systems, High-Velocity Seawater Lines |
| Marine Grade Copper Nickel | Stabilized Cu-Ni, Marine Cupronickel | C70620 / C71520 | EN CW352H / CW354H (Stabilized) | ASTM B171 / ASME SB171 | ISO CuNiFeMn (Marine Grade) | Offshore Platforms, Shipbuilding, Desalination |
Standards & International Equivalents
| Alloy Grade | UNS Designation | ASTM / ASME Standard | EN / DIN Standard | ISO Designation | BS Standard | JIS Standard | Typical Industry Usage |
|---|---|---|---|---|---|---|---|
| Copper Nickel 90/10 | C70600 | ASTM B171 / ASME SB171 | EN 1652 / CW352H (CuNi10Fe1Mn) | ISO 1634 / CuNi10Fe1Mn | BS 2870 CN102 | JIS H 3100 C7060 | Condensers, Heat Exchangers, Seawater Systems |
| Copper Nickel 70/30 | C71500 | ASTM B171 / ASME SB171 | EN 1652 / CW354H (CuNi30Mn1Fe) | ISO 1634 / CuNi30Mn1Fe | BS 2870 CN107 | JIS H 3100 C7150 | Naval Piping, Offshore Platforms, Desalination |
| Marine Grade Copper Nickel | C70620 / C71520 | ASTM B171 / ASME SB171 (Stabilized) | EN 1652 / CW352H / CW354H (Stabilized) | ISO 1634 (Stabilized CuNiFeMn) | BS 2870 CN102 / CN107 (Marine) | JIS H 3100 (Marine Grade) | Shipbuilding, Offshore Oil & Gas, Power Plants |
Applications
| Application Sector | Copper Nickel 90/10 Sheets (CuNi10Fe1Mn) |
Copper Nickel 70/30 Sheets (CuNi30Mn1Fe) |
Marine / Stabilized Cu-Ni Sheets | Key Performance Reason |
|---|---|---|---|---|
| Heat Exchangers & Condenser Plates | ✔ Preferred | ✔ For High-Velocity Seawater | ✔✔ Long-Life Marine Duty | Outstanding resistance to seawater corrosion & biofouling |
| Shipbuilding (Hull Systems & Linings) | ✔ Secondary Systems | ✔✔ Primary Choice | ✔✔✔ Naval / Commercial Vessels | High strength, erosion-corrosion resistance, weldability |
| Offshore Platforms & FPSOs | ✔ Utility Areas | ✔✔ Main Process Areas | ✔✔✔ Harsh Offshore Environment | Resists chloride attack, stress corrosion & cavitation |
| Desalination Plants | ✔ Brine Handling | ✔✔ Evaporator Sections | ✔✔✔ High Salinity Zones | Superior resistance to hot, fast-moving seawater |
| Power Plants (Thermal / Nuclear) | ✔ Cooling Systems | ✔✔ Condenser & Heat Transfer | ✔✔✔ Critical Cooling Circuits | Stable mechanical properties at elevated temperatures |
| Marine Piping System Components | ✔ Sheet Fabricated Parts | ✔✔ Heavy-Duty Fabrications | ✔✔✔ Long-Term Marine Exposure | Excellent formability & weldability for custom fabrication |
| Oil & Gas Seawater Injection Systems | ✖ Not Recommended | ✔✔ Suitable | ✔✔✔ Industry Standard | Exceptional resistance to sulfides & microbial corrosion |
| Anti-Fouling & Bio-Resistant Surfaces | ✔ Good | ✔✔ Better | ✔✔✔ Best | Natural resistance to marine organism attachment |
| Architectural & Coastal Infrastructure | ✔ Coastal Use | ✔✔ High-Exposure Areas | ✔✔✔ Extreme Coastal Conditions | Excellent corrosion resistance with minimal maintenance |
| Fabricated Marine Equipment Panels | ✔ Light Duty | ✔✔ Structural Duty | ✔✔✔ Mission-Critical Equipment | High fatigue strength and long service life |
Standard Copper Nickel Sheets (Cu-Ni Alloys) – 90/10, 70/30 Dimensional Chart
| Parameter | Copper Nickel 90/10 (CuNi10Fe1Mn) |
Copper Nickel 70/30 (CuNi30Mn1Fe) |
Marine / Stabilized Cu-Ni Grades |
|---|---|---|---|
| Thickness Range | 0.5 mm – 25 mm | 0.8 mm – 30 mm | 0.8 mm – 40 mm |
| Standard Sheet Width | 1000 mm, 1220 mm, 1500 mm | 1000 mm, 1220 mm, 1500 mm | 1000 mm – 2000 mm |
| Standard Sheet Length | 2000 mm, 2440 mm, 3000 mm | 2000 mm, 2440 mm, 3000 mm | 2000 mm – 6000 mm |
| Available Forms | Sheets, Cut Plates, Coils | Sheets, Plates, Coils | Sheets, Heavy Plates, Custom Panels |
| Thickness Tolerance | As per ASTM B122 / EN 1652 | As per ASTM B122 / EN 1652 | ASTM / EN / Project-Specific |
| Flatness | Standard Commercial Flatness | Improved Flatness Available | Controlled Flatness for Fabrication |
| Edge Condition | Mill Edge / Slit Edge | Mill Edge / Slit Edge | Sheared / Machined Edge |
| Surface Finish | Mill Finish, Pickled | Mill Finish, Pickled | Pickled, Bright Annealed (on request) |
| Temper / Condition | Annealed (O) | Annealed (O) | Annealed / Stress-Relieved |
| Supply Standard | ASTM B122 / ASME SB122 | ASTM B122 / ASME SB122 | ASTM, EN, DIN, Naval Specs |
| Custom Sizes | ✔ Available | ✔ Available | ✔✔ Project-Specific |
| Selection Factor | Sheet (Typically ≤ 3 mm / 5 mm) | Plate (Typically ≥ 3 mm / 5 mm) | What EPC / Fabricators Prefer |
|---|---|---|---|
| Primary Use | Light fabrication, cladding, small panels, ducting, enclosures | Structural panels, heavy-duty marine panels, base plates, high-load parts | Use sheets for formed parts, plates for load-bearing & welded structures |
| Formability (Bending / Rolling) | Excellent; lower forming force, tighter bend radii possible | Moderate; higher force, larger bend radii required | If the job needs tight bends or rolling—sheet wins |
| Weldability (Heat Input Sensitivity) | Higher risk of distortion, burn-through, warping if heat input is uncontrolled | More stable; better heat sink, easier to control penetration | For heavy weldments, plates are safer and more repeatable |
| Welding Distortion Risk | High | Medium to Low | Thin sheet needs fixtures, tack strategy, and low heat input |
| Joint Preparation | Often not required (square butt / lap joints common) | Often required (V-groove / bevel for full-penetration welds) | Plate welding is procedure-driven (WPS/PQR), especially in marine jobs |
| Dimensional Stability During Fabrication | Lower; can “oil-can” and move during cutting/welding | Higher; holds shape better during welding and machining | Choose plates where alignment tolerance is tight |
| Machining Allowance | Limited; low stock for facing/milling | Better; enough stock for machining, slotting, drilling precision holes | If machining is needed after welding—plate is the right call |
| Cutting Process Preference | Shearing, slitting, laser, waterjet | Waterjet, plasma (if permitted), saw cutting, machining | Cu-Ni is commonly waterjet for clean edge + low HAZ |
| Edge Condition Importance | Moderate; slit edges may need deburring for welding | High; edge prep quality affects penetration and NDT acceptance | Specify edge prep for plates used in pressure / marine structures |
| Typical Welding Processes | GTAW (TIG) preferred; low heat input | GTAW root + GMAW/Pulsed MIG fill (project dependent) | TIG dominates Cu-Ni for quality-critical work |
| NDT / Inspection Expectation | Usually visual + dimensional checks | Often VT + PT + RT/UT (as per code / spec) | Plate weldments are more likely to face formal NDT |
| Cost & Availability | Cheaper per kg to process; widely available in coils/sheets | Higher cost per piece; heavier logistics; longer lead times in thick sizes | Use sheet unless engineering forces you into plate |
| When You Must Choose Plate | High heat input welding • Full penetration welds • Post-weld machining • Tight alignment tolerances • Structural stiffness requirement • Marine erosion / impact zones • Code / spec minimum thickness requirement | ||
| When Sheet is the Best Choice | Forming/rolling heavy • Lightweight panels • Low weld length • Minimal distortion tolerance • Cladding/lining • Coil-fed production • Fast delivery needs | ||
Technician-Grade Selection Rule (No-Nonsense):
If the part needs forming → start with sheet. If the part needs heavy welding + stiffness + machining after weld → specify plate. For Cu-Ni marine work, distortion control and edge prep quality decide weld acceptance more than alloy grade.
If the part needs forming → start with sheet. If the part needs heavy welding + stiffness + machining after weld → specify plate. For Cu-Ni marine work, distortion control and edge prep quality decide weld acceptance more than alloy grade.
