C68700 CuZn20Al2 CZ110 Aluminum Brass Tube
C68700 aluminum brass is a copper-zinc alloy enhanced with aluminum and a corrosion inhibitor to deliver exceptional resistance to high-velocity seawater and brackish water. Known for its strength and durability, this alloy is engineered to withstand impingement attack and erosion-corrosion in aggressive cooling environments.
Description
Inhibited aluminum brass tubes (C68700) are widely used in condenser systems, especially in marine, power generation, and desalination settings, where water velocity and salt content challenge the long-term performance of standard copper alloys.
Applications
C68700 aluminum brass tubes are commonly used in:
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Condenser tubes for high-velocity cooling water
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Seawater cooling systems in marine and offshore applications
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Power station condensers (marine and land-based)
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Desalination plants and saltwater treatment facilities
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Heat exchangers exposed to turbulent or contaminated water
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Industrial cooling systems with brackish or saline water circulation
Key benefits
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Exceptional resistance to impingement and erosion: handles high-velocity water without thinning or surface degradation.
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Superior corrosion resistance in salt and brackish water: aluminum content and inhibitors protect against pitting, dezincification, and scaling.
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Reliable performance in marine and industrial settings: maintains mechanical integrity even under fluctuating thermal loads and flow conditions.
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High thermal conductivity for effective heat transfer: ensures energy-efficient operation in demanding cooling applications.
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Extended service life: reduces maintenance costs and unplanned downtime in critical systems.
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Compliance with international standards: manufactured to meet ASTM B111 and other global specifications.
Technical specifications
| No.UNS | C68700 - BSI No. CZ110- ISO name CuZn22AI2 |
| Chemical comp. (%) | Cu 76~79/AI 1.8~ 2.5 / Pb 0.07 / Fe 0.06 max / Zn rem / As 0.02 ~ 0.06 |
| ASTM spec. | B 111, B 395 |
| ASME spec. | SB 111, SB 395 |
| Applications | Heat exchangers, condensers, and cooling systems; desalination equipment. |
| Temper | 061 annealed |
Properties and metrics
| Properties * | Metric | English |
| Density | 8.33 g/cc | 0.301 lb/in3 |
| Tensile strength | 345 MPa | 50 ksi |
| Yield strength | 125MPa | 18 ksi |
| CTE, linear | 18.5 10-6/℃@20-300℃ | 10.3 10-6/°F @ 70-570°F |
| Specific heat capacity | 0.09 cal/g-℃@20℃ | 0.09 BTU/Ib-°F@70°F |
| Thermal conductivity | 100.4 W/m-K@20℃ | 58 BTU/ft2/ft/h/°F @ 70°F |
| Melting point | 932~971℃ | 1710~1780°F |
* The information provided on this page includes typical values which are only for general reference and information. These values are not intended for exact specification, design or engineering purposes.
Frequently asked questions about admiralty brass
Q1.What is aluminum brass used for?
Aluminum brass (C68700) is used in power plant condensers, oil coolers, and high-velocity seawater systems due to its excellent resistance to impingement and corrosion.
Q2.What is the effect of aluminum in brass?
Adding aluminum to brass improves its corrosion resistance, particularly in aggressive environments like seawater. It also increases strength and resistance to dezincification.
