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Copper Alloys C71520 | Product Overview
Introduction To Copper Alloys C71520 / CU-NI 70/30
MOKSH TUBES & FITTINGS LLP proudly supplies and exports Copper Nickel C71520, a high-performance variant of the traditional CU-NI 70/30 (UNS C71500) alloy. This enhanced copper-nickel alloy offers improved mechanical strength, corrosion resistance, and erosion resistance over conventional grades.
Copper Alloys C71520, is a controlled composition Copper-Nickel Alloy with approximately 70% copper and 30% nickel, with additions of iron and manganese for increased resistance to seawater flow, cavitation, and stress corrosion cracking. It is specially formulated for high-velocity seawater environments and heat exchanger service. This alloy is often specified in naval, offshore, desalination, and thermal power applications.
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Technical Specifications – Copper Nickel C71520 (Enhanced Cu-Ni 70/30)
| Category | Details |
|---|---|
| Material | Copper Nickel 70/30 – Enhanced Grade |
| UNS Number | C71520 |
| EN Equivalent | CW354H |
| ISO / DIN | CuNi30Fe1Mn |
| Copper Content | ~65 – 69 % |
| Nickel Content | 29 – 33 % |
| Iron Content | 0.4 – 1.2 % |
| Manganese | 0.5 – 1.0 % |
| Magnetic Properties | Non-Magnetic |
| Heat Treatable | ❌ No |
| Strength Control | Cold Working |
| Seawater Resistance | Excellent (High-Velocity Flow) |
| Erosion / Cavitation | Superior |
| Typical Use | Marine, Offshore, Heat Exchangers |
Chemical Composition – UNS C71520
| Element | Composition (% by weight) |
|---|---|
| Copper (Cu) | Balance (approx. 65 – 69) |
| Nickel (Ni) | 29.0 – 33.0 |
| Iron (Fe) | 0.4 – 1.2 |
| Manganese (Mn) | 0.5 – 1.0 |
| Zinc (Zn) | ≤ 1.0 |
| Lead (Pb) | ≤ 0.02 |
| Other Impurities | ≤ 0.50 (Total) |
Note: C71520 includes enhanced control over trace elements and impurity levels for superior corrosion resistance in critical systems.
Physical Properties – Copper Nickel C71520
| Property | Imperial Units | Metric Units |
|---|---|---|
| Density | 0.323 lb/in³ | 8.94 g/cm³ |
| Melting Range | 2260 – 2390 °F | 1240 – 1310 °C |
| Thermal Conductivity | 19 Btu/ft·hr·°F | 33 W/m·K |
| Electrical Conductivity | 6 – 10% IACS | — |
| Electrical Resistivity | 312 ohm·cmil/ft | 0.520 µΩ·m |
| Specific Heat | 0.09 Btu/lb·°F | 0.38 J/g·K |
Heat Treatment & Fabrication – C71520
| Process | Temperature Range | Purpose |
|---|---|---|
| Annealing | 700 – 900 °C | Restores ductility |
| Stress Relieving | 300 – 350 °C | Reduces residual stresses |
| Cold Working | — | Increases strength & hardness |
| Welding | TIG / MIG / SMAW | Excellent weldability |
| Brazing | ✔ | Suitable |
C71520 retains corrosion resistance and mechanical integrity after welding, making it ideal for naval and offshore systems.
Mechanical Properties – C71520 (Annealed Condition)
| Condition | Tensile Strength | Yield Strength (0.2%) | Elongation (%) | Hardness |
|---|---|---|---|---|
| Annealed / Soft (M20 / O25) | ≥ 50 ksi / ≥ 345 MPa | ≥ 18 ksi / ≥ 125 MPa | 30 – 35% | ~80 HB |
| Half-Hard (H01) | ~55 ksi / ~380 MPa | ~25 ksi / ~170 MPa | ≥ 10% | 80 – 100 HB |
| Quarter-Hard (H04) | ~60 ksi / ~415 MPa | ~25 ksi / ~170 MPa | ≥ 10% | 100 – 120 HB |
| Full-Hard (H08) | ~65 ksi / ~450 MPa | ~25 ksi / ~170 MPa | ≥ 10% | 110 – 130 HB |
| Flat Products (M10) | 45 – 50 ksi / 310 – 345 MPa | ≥ 20 ksi / ≥ 105 MPa | ≥ 30% | ~80 HB |
International Standards & Equivalent Grades – C71520
| Standard | Equivalent |
|---|---|
| UNS | C71520 |
| EN | CW354H |
| ISO | CuNi30Fe1Mn |
| DIN | 2.0882 |
| ASTM | B111, B122, B171, B466, B467 |
| MIL | MIL-T-16420 |
| DEF-STAN | 02-879 |
Products in Copper Alloys C71520
Copper Alloys C71520 is available in:
✔
Seamless Pipes
✔
Welded Pipes (ERW & EFW)
✔
Tubes (Capillary, U-Bend)
✔
Sheets & Plates
✔
Coils & Strips
✔
Round Bars, Flat Bars, Hex Bars, Square Bars
✔
Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
✔
Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
✔
Fasteners (Bolts, Nuts, Screws, Washers, Studs)
✔
Custom Fabricated Components
Copper Alloys C71520 products are produced to the following global standards:
Uses and Advantages
Exceptional resistance to seawater corrosion and biofouling
High mechanical strength and toughness
Excellent weldability and formability
Non-magnetic and spark-resistant
Thermal and electrical stability
Applications of Copper Alloys C71520
Copper Alloys C71520 is extensively used in:
Outstanding Seawater Corrosion Resistance
C71520 offers superior resistance to saltwater, chloride ions, biofouling, and MIC (microbial corrosion).
Improved Strength & Durability
Higher tensile and yield strength than standard C71500, making it suitable for pressurized and structural marine components.
Superior Erosion Resistance
Highly effective in high-velocity turbulent seawater systems and brine environments.
Excellent Heat Transfer Properties
Low scaling and fouling rates with excellent thermal conductivity make it perfect for heat exchangers and condensers.
Good Weldability & Fabricability
Compatible with all common welding methods including TIG, MIG, and brazing.
WHY CHOOSE US?
COPPER NICKEL C71520 PRICE PER KG (INDIA)
Typical Range: ₹2,400 – ₹4,800 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is Copper Nickel C71520 and how is it different from C71500?
Copper Nickel C71520 is a high performance version of the traditional Cu-Ni 70/30 alloy (UNS C71500). It contains around 70% copper and 30% nickel with controlled additions of iron and manganese, giving it enhanced mechanical strength, better erosion resistance, and improved durability in high-velocity seawater environments compared to the standard grade.
What are the main advantages of Copper Nickel C71520?
- Exceptional resistance to seawater corrosion, biofouling, and microbial corrosion
- Superior erosion and cavitation resistance in turbulent marine systems
- Excellent thermal conductivity for heat exchangers
- Retains strength at high pressures
- Non-magnetic and spark resistant
- Highly weldable, making it ideal for critical engineering applications
Where is Copper Nickel C71520 commonly used?
- Marine & Offshore engineering seawater piping, condensers, pumps, ship hulls.
- Naval & Defense submarine components, anti-fouling systems, seawater cooling lines.
- Desalination plants brine heaters, high-pressure piping.
- Power plants condensers and heat exchangers.
- Oil & Gas firewater systems, hydraulic lines, instrumentation tubing.
What Copper Nickel C71520 products are available from MOKSH TUBES & FITTINGS LLP?
- Seamless and Welded Pipes.
- Heat Exchanger and U-bend Tubes.
- Sheets, Plates, Coils, Strips.
- Round Bars, Square Bars, Hex Bars.
- Pipe Fittings.
- Flanges.
- Fasteners.
- Custom Fabricated Components.
Why should I choose MOKSH TUBES & FITTINGS LLP for Copper Nickel C71520?
- Certified materials that meet ASTM, EN, MIL, and DEF STAN standards.
- In house CNC machining & customized fabrication.
- Strict quality control with third party inspections.
- Fast worldwide delivery with export ready packaging.
- Trusted solutions for marine, power, offshore, oil & gas, and defense projects.
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