Category:
Nickel Alloy
Copper nickel is also known as cupronickel, it is made of copper and nickel and is corrosive resistant, which makes it a good choice for various usages.
Cupro Nickel, its usages and applications:
In copper Nickel there are mainly five regular usages you may be familiar with.
Currency coins
Used as an alloy in the manufacturing of currency coins, The US penny has 97.5% zinc & 2.5% copper. Cupronickel is mainly used in coinage because it’s protected to various chemicals and environmental damages, moreover copper alloys are less likely to corrode than other alloys, such as brass.
Desalination Plants
Cupronickel is a preferred metal to be utilize in desalination plants due to its capacity to withstand high temperatures and pressure related with desalination. More importantly cupronickel shows no corrosion when exposed to salt water this makes it excellent for marine applications.
The entire process works by the heating of water to create steam that is used to drive a turbine that eventually powers the desalination process.
Heat Exchangers
CuNi is mainly used in heat exchangers due to its higher heat conductivity properties compared to other metals. It has an ability to transfer heat more efficiently which makes it most suitable for effective movement. Whether it’s a car radiator or a home heating system, one can be assured that it contains Copper nickel to transfer heat.
Marine Hardware
Cuni Alloy stays at top for marine hardware, used in boat propellers and hulls reason being its resistance to salt water corrosion compared to other metals. More importantly it doesn’t compromises on strength which makes the most ideal metal, so its dual features of strength and corrosion resistance is the essence in marine hardware usage.
Advantages of using cupro-nickel alloy
It has several advantages due to its unique combination of its properties some the prime advantages are given below:
- Corrosion resistance
- High temperature resistance
- Easy to manufacture
- Low in maintenance
- Good electrical conductivity
- Creative look
Copper Nickel Products
- Copper Nickel Pipe
- Copper Nickel Round Bar
- Copper Nickel Pipe Fittings
- Copper Nickel Flanges
- Copper Nickel Fastener
- Copper Nickel 90/10 Pipe
- Copper Nickel 70/30 Pipe
- Copper Nickel Plate
- 70/30 Copper Nickel Sheet
Types of Copper Nickel
- Copper Nickel Alloy (CUNI) 90/10
- Copper Nickel Alloy (CUNI) 70/30
Cupro Nickel ASTM Standard
| Products | ASTM / ASME / AMS standard |
|---|---|
| Bars (flat / hex/ square) | MILITARY MIL-C-15726, ASTM B122, SB122, B151, SAE J461, J463 |
| Bolts -fasteners | ASTM F468 / ASME SF468 |
| Electrode, Welding | MILITARY MIL-E-22200/4, AWS A5.6 |
| Nuts -fasteners | ASTM F467 / SF467 |
| Seamless Pipe | ASTM B466, ASME SB 466 |
| Welded Pipe | ASTM B608, B467, SB608, SB467 |
| Condenser Tubes | ASME SB111, ASTM B552, B111, MILITARY MIL-T-15005, SAE J463, J461 |
| Finned Tubes | ASTM B359, ASME SB359, MILITARY MIL-T-22214 |
| Seamless Tubes | ASTM B466, ASME SB466, MILITARY MIL-T-16420 |
| U-Bend Tubes | ASTM B395, ASME SB395 |
| Welded Tubes | ASTM B543, ASME SB543 |
| Plates | MILITARY MIL-C-15726, ASTM B122, SB122, SAE J463/ J461 |
| Clad Plates | ASTM B432, SB432 |
| Plates, Condenser Tube | ASTM B171, ASME SB171, SAE J463, J461 |
| Rods | MIL-C-15726, ASTM B151, SB151 |
| Screws (fasteners) | ASTM F468, SF468 |
| Sheets | ASTM B122, SB122, SAE J461, J463, MIL-C-15726 |
| Strips products | ASTM B122, SB122, SAE J461, J461, MIL-C-15726 |
| Studs | ASTM F468, SF468 |
| Wires | MILITARY MIL-C-15726 |
Cupro Nickel Applications & Uses
- Evaporator Tubes
- Boilers & Heat Exchanger
- Boilers & Heat Exchanger Condenser Tubes
- Distiller
Copper Nickel Composition Standard
| Elements | 70/30 Copper nickel | 90/10 Copper nickel (popular grade) |
|---|---|---|
| Nickel | 29.0 – 32.0% | 9.0 – 11.0% |
| Copper | 86 – 89.7% | 70.1 – 65.5% |
| Iron | 0.5 – 1.5% | 1.0 – 2.0% |
| Manganese | 0.4 – 1.0% | 0.3 – 1.0% |
Physical Properties
| Properties | Imperial units of temperature | Metric Units of temperature |
|---|---|---|
| Specific Gravity | 8.94 | 8.94 |
| Themal Conductivity | 23 BTU/ft³/ft/hr/°F @ 68°F | 40 W/m. °K at 20°C |
| Thermal Capacity (Specific Heat) | 0.09 BTU/lb/°F @ 68°F | 380 J/kg. °K at 20°C |
| Density | 0.323 lb/in³ @ 68°F | 8.94 gm/cm³ at 20°C |
| Coefficient of Thermal Expansion | 9.5 x 10 -5 / °F (68-392°F) | 17.1 x 10 -6 / °C (20-300°C) |
| Electrical Conductivity (Ann.) | 9.1% IACS | 5.26 microhm?¹.cm?¹ at 20°C |
| Modulus of Elasticity (tension) | 20 x 10 6 psi at 68°F | 140 GPa at 20°C |
| Modulus of Rigidity (torsion) | 7.5 x 10 6 psi at 68°F | 52 GPa at 20°C |
| Melting Range (Liquidus) | 21,000°F | 11,500°C |
| Melting Range (Solidus) | 20,100°F | 11,000°C |
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