BS 2871 Part 3 CZ 110 Aluminium Brass Tubes are seamless copper alloy tubes used in heat transfer equipment that are required to withstand high water-cooling environments. The alloy is about 77% copper, with controlled arsenic content to mitigate dezincification, and approximately 2% aluminium. Aluminium develops a protective oxide film which enhances the resistance to erosion-corrosion and impingement attack of flowing seawater. The same alloy is referred to in BS EN 12451 as CuZn20Al2As (CW702R), and is the superseding of BS 2871 Part 3. The tubes are widely used in marine condensers, thermal power stations, desalination plants, and industrial heat exchangers. Amardeep Steel supplies CZ110 Aluminium Brass Tubes with quality inspection and mill test certificates for domestic and international requirements.
Specifications of BS 2871 Part 3 CZ110 Aluminium Brass Tubes
Parameter | Specification |
|---|---|
Standard | BS 2871 Part 3; supplied to BS EN 12451 CuZn20Al2As (CW702R) or ASTM B111 C68700 as equivalent on request |
Grade | CZ110 aluminium brass |
Type | Seamless, cold drawn |
Outside Diameter | 6 mm to 108 mm |
Wall Thickness | 0.5 mm to 3.0 mm |
Length | Straight up to 15 m, cut lengths or U-bends |
Condition | O (annealed) for condenser tube; TA and M on request |
Tests | Eddy current or hydrostatic, flattening, expansion, residual stress, grain size |
Documents | EN 10204 3.1; 3.2 or third-party inspection on request |
Chemical Compositions of BS 2871 Part 3 CZ110 Aluminium Brass Tubes
Element | BS 2871 Part 3 CZ110 (%) | Nominal (%) |
|---|---|---|
Copper (Cu) | 76.0 to 78.0 | 77.0 |
Aluminium (Al) | 1.8 to 2.3 | 2.0 |
Arsenic (As) | 0.02 to 0.06 | 0.04 |
Lead (Pb), max | 0.07 | Not applicable |
Iron (Fe), max | 0.06 | Not applicable |
Zinc (Zn) | Remainder | 21.0 |
Total Impurities, max | 0.30 | Not applicable |
Physical Properties of BS 2871 Part 3 CZ110 Aluminium Brass Tubes
Physical Property | Metric | Imperial |
|---|---|---|
Density | 8.33 g/cm³ | 0.301 lb/in³ |
Melting Range | 930 to 970°C | 1,710 to 1,780°F |
Thermal Conductivity (20°C) | 100 W/m·K | 58 Btu/ft·h·°F |
Electrical Conductivity | 23% IACS | 23% IACS |
Thermal Expansion (20 to 300°C) | 18.5 µm/m·K | 10.3 µin/in·°F |
BS 2871 Part 3 CZ110 Aluminium Brass Tubes Mechanical Properties
Property | Value | Basis |
|---|---|---|
Tensile Strength, min | 345 MPa (50 ksi) | ASTM B111 C68700, O61 annealed |
Yield Strength, min | 125 MPa (18 ksi) | ASTM B111 C68700, O61 annealed |
Tensile Strength, min | 375 MPa | JIS H 3300 C6870T, O |
Elongation, min | 40% | JIS H 3300 C6870T, O |
Grain Size | 0.010 to 0.045 mm | ASTM, JIS, NFA |
Equivalent Grades of BS 2871 Part 3 CZ110 Aluminium Brass Tubes
Standard | Designation |
|---|---|
BS 2871 Part 3 (former British) | CZ110 |
BS EN 12451 (European) | CuZn20Al2As, CW702R |
ASTM B111 / ASME SB111 | UNS C68700 |
JIS H 3300 | C6870 |
DIN 1785 (former German) | CuZn20Al2 |
NF A 51-102 (former French) | CuZn22Al2 |
IS 1545 (India) | CuZn21Al2As |
ISO | CuZn20Al2 |
GB/T 8890 (China) | HAl77-2 |
Size Chart of BS 2871 Part 3 CZ110 Aluminium Brass Tubes
Parameter | Range |
|---|---|
Outside diameter | 6 mm to 108 mm (confirm client range) |
Wall thickness | 0.5 mm to 3.0 mm |
Length | Straight up to 15 m, cut lengths or U bends |
Condition | O (annealed); TA and M on request |
Applications and Industrial Uses of BS 2871 Part 3 CZ110 Aluminium Brass Tubes
- Thermal Power Generation Industry
- Shipbuilding and Marine Engineering
- Offshore Oil and Gas Industry
- Seawater Desalination Industry
- Petroleum Refining Industry
- Petrochemical Processing Industry
- Industrial Cooling Systems
- HVAC and Refrigeration Industry
Frequently Asked Questions
1. What are BS 2871 Part 3 CZ110 Aluminium Brass Tubes?
CZ110 Aluminium Brass Tubes are seamless copper alloy tubes containing approximately 77% copper and 2% aluminium, used in condensers and heat exchangers.
2. Is CZ110 equivalent to ASTM B111 C68700?
CZ110 and ASTM B111 C68700 are closely equivalent aluminium brass grades, although their chemical composition limits may differ.
3. What is the difference between CZ110 and CZ111 brass?
CZ110 is aluminium brass containing approximately 2% aluminium, while CZ111 is admiralty brass containing approximately 1% tin.
4. What is the density of CZ110 Aluminium Brass?
The typical density of CZ110 Aluminium Brass is approximately 8.3 g/cm³.
5. Are CZ110 tubes suitable for seawater applications?
Yes. CZ110 tubes are suitable for seawater-cooled condensers and heat exchangers due to their resistance to erosion-corrosion and impingement attack.
6. What does condition O, TA or M mean in BS 2871?
O means annealed, TA means temper annealed (stress relieved), and M means as drawn (hard). Condenser tubes are usually supplied in condition O.
7. Is aluminium brass the same as aluminium bronze?
No. Aluminium brass (CZ110, C68700) is a copper-zinc alloy with about 2% aluminium, while aluminium bronzes such as C61300 are copper-aluminium alloys with little or no zinc.
