EN12451 CuZn20Al2As is a seamless aluminium brass alloy pipe suitable for use in demanding cooling-water applications in heat transfer systems. This grade, identified by European material number CW702R, is a composition of about 77% copper and 2% aluminium, with zinc and controlled arsenic as the remaining constituents of the alloy. It has an aluminium-enriched protective surface that resists the attack of the impinging fast-moving sea water, and has a dezincification-resistant surface due to the presence of arsenic. The tubes are manufactured in accordance with EN 12451 specifications and are specified for surface condensers, marine coolers, evaporators and desalination applications. Amardeep Steel is an aluminium brass pipe supplier that offers quality inspection and mill test certificate to domestic and international customers.
Specifications of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
Parameter | Specification |
|---|---|
Standard | EN 12451 (seamless round tubes for heat exchangers) |
Grade | CuZn20Al2As, material number CW702R |
Type | Seamless, cold drawn |
Outside Diameter (OD) | 6 mm to 108 mm |
Wall Thickness | 0.5 mm to 3.0 mm |
Length | Straight lengths up to 15 m, custom cut lengths, or bent U-tubes |
Temper | Annealed (EN R temper: R330); custom tempers on request |
Tests | Eddy current testing, flattening test, drift expansion test, residual stress test (ammonia or mercurous nitrate), grain size determination |
Documentation | EN 10204 3.1 mill test certificate; EN 10204 3.2 third-party inspection available on request |
Chemical Compositions of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
Element | EN 12451 CuZn20Al2As, CW702R (%) |
|---|---|
Copper (Cu) | 76.0 to 79.0 |
Aluminium (Al) | 1.8 to 2.3 |
Arsenic (As) | 0.02 to 0.06 |
Iron (Fe) | 0.07 max |
Lead (Pb) | 0.05 max |
Manganese (Mn) | 0.1 max |
Nickel (Ni) | 0.1 max |
Phosphorus (P) | 0.01 max |
Zinc (Zn) | Remainder |
Physical Properties of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
Physical Property | Metric Value | Imperial Value |
|---|---|---|
Density | 8.33 g/cm³ | 0.301 lb/in³ |
Melting Range | 932 to 971°C | 1,710 to 1,780°F |
Thermal Conductivity (at 20°C) | 100 W/m·K | 58 Btu/ft·h·°F |
Electrical Conductivity | 23% IACS | 23% IACS |
Modulus of Elasticity | 110 GPa | 16,000 ksi |
Mechanical Properties of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
Property | Value | Basis |
|---|---|---|
Tensile strength, min | 330 MPa | CW702R, EN temper R330 |
Yield strength Rp0.2, min | 90 MPa | CW702R, EN temper R330 |
Elongation, min | 30% | CW702R, EN temper R330 |
Equivalent Grades of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
Standard / Region | Grade Designation |
|---|---|
EN 12451 (European Union) | CuZn20Al2As / CW702R |
ASTM B111 / ASME SB111 (USA) | UNS C68700 |
BS 2871 Part 3 (Former UK) | CZ110 |
DIN 1785 (Former Germany) | CuZn20Al2 / 2.0460 |
NF A 51-102 (Former France) | CuZn22Al2 |
JIS H 3300 (Japan) | C6870T |
IS 1545 (India) | CuZn21Al2As |
ISO 1554 | CuZn20Al2 |
Applications and Industrial Uses of EN 12451 CuZn20 Al2As Aluminium Brass Pipe
- Thermal Power Generation Industry
- Marine and Shipbuilding Industry
- Offshore Oil and Gas Industry
- Seawater Desalination Industry
- Petroleum Refining Industry
- Petrochemical Processing Industry
- Industrial Heat Exchanger Manufacturing
- Desalination evaporators and MSF plants
Frequently Asked Questions
1. What is EN 12451 CuZn20Al2As aluminium brass pipe?
EN 12451 CuZn20Al2As is a copper-zinc-aluminium alloy tube containing arsenic, designed for heat exchangers and condensers requiring corrosion resistance.
2. What is CW702R?
CW702R is the European material number for CuZn20Al2As aluminium brass, specified under EN 12451.
3. Is CuZn20Al2As suitable for seawater applications?
Yes, CuZn20Al2As aluminium brass offers good resistance to seawater corrosion and is used in marine condensers, heat exchangers, and cooling systems.
4. What makes aluminium brass pipes resistant to seawater corrosion?
Aluminium forms a protective oxide film that helps resist corrosion and impingement attack, while arsenic helps control dezincification.
5. What does R330 mean on an EN 12451 tube?
R330 is an EN temper designation indicating a minimum tensile strength of 330 MPa for the specified tube condition.
6. Is CuZn20Al2As the same as CZ110?
Yes, they refer to the same aluminium brass alloy. CZ110 is the designation used in BS 2871 Part 3, which was superseded by EN 12451.
