EN 12451 CuZn28 Sn1As admiralty brass pipe and tube is made from a copper-zinc alloy used in condensers, evaporators, and industrial heat exchangers. Also referred to as CW706R, this alloy is a combination of approximately 71% copper, some tin and arsenic to aid corrosion resistance and help prevent dezincification. Depending on the operating conditions and material suitability, it is used in water-cooling systems for fresh water, brackish water or seawater. In marine applications, for power generation, and industrial cooling systems. For seamless tubes used in heat exchanges, refer to EN 12451 and make sure that the OD, thickness, and temper of your tube are correct before ordering. Amardeep Steel offers EN 12451 CW706R admiralty brass pipe and tube, cut to length or U-bend.
Technical Data
Specifications of EN 12451 CuZn28Sn1As Admiralty Brass Pipe
| Parameter | Details |
|---|---|
|
Standard |
EN 12451 (seamless round copper and copper alloy tubes for heat exchangers) |
|
Material |
CuZn28Sn1As, material number CW706R (admiralty brass) |
|
Type |
Seamless, extruded and cold drawn, then annealed |
|
Outside Diameter |
6 mm to 254 mm (condenser tube typically 8 mm to 108 mm, 1/4" to 4 1/4") |
|
Wall Thickness |
0.5 mm to 10 mm (condenser tube typically 0.8 mm to 3.0 mm) |
|
Length |
Up to 6 m, or to the condenser and heat exchanger design |
|
Temper |
Soft annealed. Other tempers on request |
|
Surface Finish |
Bright, polished or plain |
|
Packing |
End capped, each tube shrink wrapped, in wooden boxes |
|
HS Code |
7411 21 00 |
Chemical Compositions of EN 12451 CuZn28Sn1As Admiralty Brass Pipe
| Element | CuZn28Sn1As (%) | Nominal (%) |
|---|---|---|
|
Copper (Cu) |
70.0 to 73.0 |
71.0 |
|
Tin (Sn) |
0.8 to 1.2 |
1.0 |
|
Arsenic (As) |
0.02 to 0.06 |
0.04 |
|
Iron (Fe) |
0.06 max |
Not stated |
|
Lead (Pb) |
0.07 max |
Not stated |
|
Zinc (Zn) |
Remainder |
28.0 |
Mechanical Properties of EN 12451 CuZn28Sn1As Admiralty Brass Pipe
| Property | Value |
|---|---|
|
Tensile Strength, min |
300 N/mm² |
|
Yield Strength, min |
120 N/mm² |
|
Elongation, min |
18% |
|
Hardness |
70 to 120 HV |
EN 12451 CuZn28Sn1As Admiralty Brass Physical Properties
| Property (at 20°C / 68°F) | Metric | Imperial |
|---|---|---|
|
Density |
8.53 g/cm³ |
0.308 lb/in³ |
|
Melting Range (solidus to liquidus) |
899°C to 938°C |
1650°F to 1720°F |
|
Thermal Expansion (20°C to 300°C) |
20.2 µm/m·°C |
11.2 x 10⁻⁶ /°F |
|
Thermal Conductivity |
111 W/m·K |
64 Btu/ft·hr·°F |
|
Specific Heat |
377 J/kg·K |
0.09 Btu/lb·°F |
|
Electrical Conductivity |
25% IACS |
25% IACS |
|
Electrical Resistivity |
0.069 µΩ·m |
41.5 ohm·cmil/ft |
|
Modulus of Elasticity (tension) |
110 GPa |
16,000 ksi |
|
Modulus of Rigidity |
41 GPa |
6,000 ksi |
Equivalent Grades of CuZn28Sn1As Admiralty Brass Pipe
| Standard | Designation |
|---|---|
|
EN 12451 (European) |
CuZn28Sn1As, CW706R |
|
ISO |
CuZn28Sn1 |
|
BS 2871 Part 3 (UK, superseded) |
CZ111 |
|
ASTM B111 / ASME SB111 |
UNS C44300 |
|
DIN 1785 (former German) |
CuZn28Sn1 |
|
NF A 51-102 (former French) |
CuZn29Sn1 |
|
JIS H3300 |
C4430 |
|
IS 1545 (India) |
CuZn29Sn1As |
Applications and Industrial Uses of CuZn28Sn1As Admiralty Brass Pipe
- Fresh and Brackish Water Condensers
- Sugar Mill Evaporators and Juice Heaters
- Steam Surface Condensers
- Power Plant Heat Exchangers
- Shipboard Cooling Systems
- Industrial Evaporators
- Oil Refinery Heat Exchangers
- Industrial Process Coolers
Frequently Asked Questions
What is EN 12451 CuZn28Sn1As Admiralty Brass Pipe?
EN 12451 CuZn28Sn1As is an admiralty brass alloy, identified as CW706R, used in seamless heat exchanger and condenser tubes. It offers good corrosion resistance in suitable water-cooling applications.
What is the difference between CuZn28Sn1As and CuZn28Sn1?
CuZn28Sn1As contains a small addition of arsenic to help prevent dezincification, while CuZn28Sn1 does not specify this arsenic addition.
What is the maximum water velocity recommended for CW706R tubes?
There is no single maximum velocity for every application. The suitable water velocity depends on water quality, tube dimensions, operating conditions, and the risk of erosion-corrosion.
Is CW706R suitable for freshwater and brackish water applications?
Yes, CW706R is used in freshwater and brackish water heat exchangers. Suitability depends on water chemistry, temperature, and flow conditions.
How does tin improve the corrosion resistance of Admiralty Brass?
Tin improves the alloy's resistance to corrosion in cooling water, helping extend tube service life under suitable operating conditions.
How does arsenic prevent dezincification in brass tubes?
You can easily prevent brass tube from dezincification using arsenic inhibits dezincification, a corrosion process in which zinc is selectively removed from brass, leaving a weakened, copper-rich structure.
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