EN 12451 CuZn20 Al2As (CW702R) is the main European standard for seamless copper-zinc-aluminium tubes designed for severe heat transfer applications. Made from approximately 77% copper, 2% aluminium and a small amount of arsenic, this inhibited aluminium brass grade provides high levels of protection against dezincification, stress corrosion cracking and high velocity turbulence. Finally, the added aluminium forms a self-repairing surface oxide barrier that protects the pipes from aggressive biofouling in marine conditions and from brackish water, which are crucial for condensers, evaporators, power plant cooling loops and desalination plants in the sea. They are designed to withstand turbulent flow and maintain structural integrity over an extended period of time in harsh marine conditions, ensuring long-term thermal efficiency. USA Piping offers full documentation with material traceability, such as mill test certificates and dimensional inspection reports for every order, for Aluminium Brass Pipe (CuZn20 Al2As) supplied for compliance with EN 12451.
Specifications of EN 12451 CuZn20 Al2As (CW702R) Aluminium Brass
| Property / Category | Specification Detail |
|---|---|
| Material Designation | Aluminium Brass (CuZn20Al2As / CW702R) |
| Standard | EN 12451 |
| Product Type & Shape | Seamless Round Tubes |
| Manufacturing Technique | Seamless Extruded or Cold Drawn |
| Outer Diameter (OD) | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 8 mm |
| Length | Up to 6 metres (Customizable) |
| Available Tempers | Annealed (O60/R340), Half Hard (H075/R410), Hard (H100/R480) |
| Surface Finish | Bright / Polished / Mill Finish |
| Color | Golden Yellow |
| Tensile Strength | 345 MPa min (Annealed/R340) |
| Yield Strength | 125 MPa min |
| Elongation | 35% min |
| Density | 8.33 g/cm³ |
| Electrical Conductivity | 23% – 26% IACS |
| Lead (Pb) Content | ≤ 0.05% |
| Nickel (Ni) Content | ≤ 0.3% |
| Corrosion Resistance | Excellent resistance to seawater impinging attack and stress corrosion cracking |
| Primary Applications | Heat Exchangers, Condensers, Marine & Offshore Systems |
| Dimensional Tolerance | In strict accordance with EN 12451 standards |
| Packaging | Standard export packaging / Wooden cases |
Applications and Industrial uses of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
- Marine Heat Exchangers
- Seawater Condensers
- Power Plant Cooling Systems
- Desalination Equipment
- Offshore Cooling Systems
- Shipbuilding Equipment
- Industrial Heat Exchangers
- Seawater Cooling Systems
Frequently Asked Questions
What is EN 12451 CuZn20Al2As Aluminium Brass Pipe?
EN 12451 CuZn20Al2As is an inhibited aluminium brass tube grade, also known as CW702R, designed for heat exchangers, condensers, and marine applications.
What is EN 12451 CuZn20Al2As used for?
It is used for heat exchangers, condensers, seawater cooling systems, desalination equipment, power plants, and marine applications.
Is CW702R equivalent to UNS C68700?
Yes. CW702R is commonly associated with UNS C68700 (CuZn20Al2) aluminium brass, but applicable standard requirements should be checked for exact equivalence.
Are EN 12451 CuZn20Al2As tubes suitable for heat exchangers?
Yes. They offer good thermal conductivity and resistance to seawater corrosion, making them suitable for heat exchangers.
What is the difference between CW702R and C44300 Admiralty Brass?
CW702R is aluminium brass containing aluminium, while C44300 is Admiralty brass containing tin and arsenic. Their compositions and corrosion-resistance characteristics differ.
Can CuZn20Al2As tubes be used in condensers?
Yes. CuZn20Al2As tubes are commonly used in condensers because of their good heat-transfer performance and resistance to seawater and corrosion.