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Aluminium Brass Tubes for Condensers, Heat Exchangers & Marine Applications
Product Overview
Aluminium Brass Tubes manufactured by R V Metal Corporation are high-performance copper alloy tubes specifically developed for condenser, heat exchanger, marine, desalination, and power generation applications where resistance to seawater corrosion, erosion, and biofouling is critical. These tubes are typically produced in Aluminium Brass alloy conforming to ASTM B111 / ASME SB111 standards (commonly UNS C68700), offering superior resistance to dezincification and impingement attack compared to conventional brass and copper alloys. The controlled addition of aluminium enhances protective oxide film formation, significantly improving service life in aggressive cooling water environments. R V Metal Corporation supplies aluminium brass tubes in seamless construction, precise dimensional tolerances, and consistent mechanical properties, making them suitable for shell-and-tube heat exchangers, condensers, evaporators, and marine cooling systems used by EPC contractors, OEMs, and utilities worldwide.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product | Aluminium Brass Tubes (Seamless) |
| Material / Alloy | Aluminium Brass (Copper-Zinc-Aluminium Alloy) |
| UNS Designation | C68700 |
| Manufacturing Process | Seamless, Cold Drawn / Annealed |
| Applicable Standards | ASTM B111 / ASME SB111, BS 2871, EN 12451 |
| Outside Diameter Range | 6.35 mm to 50.80 mm (1/4” to 2”) |
| Wall Thickness Range | 0.7 mm to 3.5 mm (as per standard and application) |
| Length | Standard: 6 m / 12 m | Random Lengths on request |
| Temper Condition | Annealed (O61) / Half Hard (H55) / As Specified |
| Surface Finish | Bright Annealed / Mill Finish / Pickled |
| Density | ≈ 8.33 g/cm³ |
| Thermal Conductivity | ≈ 120 W/m·K |
| Maximum Service Temperature | Up to 300°C (depending on pressure and environment) |
| Corrosion Resistance | Excellent resistance to seawater corrosion, erosion, dezincification, and biofouling |
| Typical Applications | Condensers, Heat Exchangers, Marine Cooling Systems, Power Plants, Desalination Units |
| Testing & Inspection | Eddy Current Test, Hydrostatic Test, Dimensional Inspection, Chemical & Mechanical Testing |
| Certification | Mill Test Certificate (EN 10204 3.1), Third-Party Inspection on request |
Chemical Composition
| Element | Chemical Composition (% by Weight) |
|---|---|
| Copper (Cu) | 76.0 – 79.0 |
| Zinc (Zn) | Remainder |
| Aluminium (Al) | 1.8 – 2.5 |
| Arsenic (As) | 0.02 – 0.06 |
| Iron (Fe) | ≤ 0.06 |
| Manganese (Mn) | ≤ 0.05 |
| Lead (Pb) | ≤ 0.05 |
| Tin (Sn) | ≤ 0.03 |
| Nickel (Ni) | ≤ 0.5 |
| Other Impurities (Total) | ≤ 0.2 |
UNS Codes & Grades
| UNS Code | Grade / Alloy Name | Primary Standard | Common Designation | Typical Applications |
|---|---|---|---|---|
| C68700 | Aluminium Brass | ASTM B111 / ASME SB111 | Al-Br Condenser Tube | Seawater condensers, power plants, desalination units |
| C68700 | Aluminium Brass | BS 2871 | CZ110 | Marine heat exchangers, offshore cooling systems |
| C68700 | Aluminium Brass | EN 12451 | CuZn20Al2As | High-velocity seawater tube systems |
| C68700 | Aluminium Brass | DIN | CuZn20Al2As | Industrial condensers and marine piping |
| C68700 | Aluminium Brass | JIS | Al-Br Tube | Power generation & shipboard cooling systems |
Mechanical, Physical & Fabrication Properties
| Property | Typical Value | Unit | Remarks / Engineering Notes |
|---|---|---|---|
| UNS Grade | C68700 | — | Standard aluminium brass condenser tube alloy |
| Ultimate Tensile Strength | 380 – 480 | MPa | As per ASTM B111 temper conditions |
| Yield Strength (0.2%) | 120 – 180 | MPa | Varies with cold work / temper |
| Elongation | 30 – 45 | % | Excellent ductility for tube expansion |
| Hardness | 80 – 110 | HB | Balanced strength and formability |
| Density | 8.3 | g/cm³ | Used for accurate weight calculations |
| Thermal Conductivity | 120 – 135 | W/m·K | Lower than copper, higher than most brasses |
| Electrical Conductivity | 28 – 32 | % IACS | Not intended for electrical conduction |
| Coefficient of Thermal Expansion | 20 × 10⁻⁶ | /°C | Stable under thermal cycling |
| Melting Range | 900 – 940 | °C | Higher than admiralty brass |
| Corrosion Resistance | Excellent | — | Highly resistant to seawater & biofouling |
| Dezincification Resistance | Excellent | — | Arsenic addition prevents dezincification |
| Erosion Resistance | Very High | — | Suitable for velocities up to ~2.5–3.0 m/s |
| Formability | Good | — | Cold bending and expansion friendly |
| Weldability | Limited | — | Brazing preferred over fusion welding |
| Brazing / Tube Expansion | Excellent | — | Ideal for condenser tube sheets |
| Recommended Service Media | Seawater / Brackish Water | — | Power plants, desalination, marine systems |
Common Names & International Identifiers
| Region / Standard Body | Standard / Specification | Grade / Designation | Common Industry Name | Remarks |
|---|---|---|---|---|
| USA (ASTM) | ASTM B111 / ASME SB111 | UNS C68700 | Aluminium Brass Tube | Most widely accepted condenser tube grade |
| USA (ASTM) | ASTM B171 | UNS C68700 | Aluminium Brass Plate / Sheet | Tube sheet and plate applications |
| UK / Europe | EN 12451 | CuZn20Al2As | Aluminium Brass | Arsenic-added dezincification resistant brass |
| Germany (DIN) | DIN 17660 | CuZn20Al2As | Aluminium Brass Tube | Marine & heat exchanger service |
| Japan (JIS) | JIS H3300 | C6870 | Aluminium Brass | Condenser & desalination plants |
| India (IS) | IS 1545 | CuZn20Al2 | Aluminium Brass Tube | Power plant & marine standards |
| ISO | ISO 1634 | CuZn20Al2As | Aluminium Brass | International harmonized designation |
| Commercial / Trade | — | — | Condenser Brass | Used in tender & EPC documentation |
| Marine Industry | — | — | Marine Brass Tube | Seawater cooling applications |
| Power & Utilities | — | — | Seawater Condenser Tube | Preferred over admiralty brass |
Standards & International Equivalents
| Country / Region | Standard | Grade / Designation | UNS Code | Typical Application |
|---|---|---|---|---|
| USA | ASTM B111 / ASME SB111 | Aluminium Brass | C68700 | Condenser & heat exchanger tubes |
| USA | ASTM B171 | Aluminium Brass Plate | C68700 | Tube sheets, plates |
| Europe (EN) | EN 12451 | CuZn20Al2As | — | Marine & power plant condensers |
| Germany | DIN 17660 | CuZn20Al2As | — | Seawater heat exchangers |
| Japan | JIS H3300 | C6870 | — | Condenser & desalination plants |
| India | IS 1545 | CuZn20Al2 | — | Thermal & nuclear power plants |
| ISO | ISO 1634 | CuZn20Al2As | — | International harmonized standard |
| BS (UK) | BS 2871 | CZ110 | — | Marine condenser tubes |
| AS / NZ | AS 1572 | Aluminium Brass | C68700 | Cooling water systems |
| International Trade | — | Aluminium Brass Condenser Tube | C68700 | EPC & OEM procurement documents |
Applications
| Industry / Sector | Application | Service Conditions | Why Aluminium Brass is Used |
|---|---|---|---|
| Thermal Power Plants | Main condensers | Seawater / brackish water cooling | Excellent resistance to erosion, corrosion and bio-fouling |
| Nuclear Power Plants | Condenser & auxiliary heat exchangers | High flow velocity cooling water | Stable metallurgy and long service life |
| Desalination Plants | Evaporators & condensers | High chloride seawater | Superior resistance to pitting and impingement attack |
| Marine Engineering | Shipboard condensers & coolers | Continuous seawater exposure | Aluminium oxide film improves corrosion resistance |
| Oil & Gas Refineries | Heat exchangers & coolers | Cooling water with suspended solids | High erosion resistance compared to Admiralty Brass |
| Petrochemical Plants | Process heat exchangers | High flow industrial cooling systems | Low maintenance and stable thermal performance |
| Fertilizer Plants | Surface condensers | Aggressive cooling water | Improved resistance to dezincification |
| Power EPC Projects | Balance of plant (BOP) exchangers | Large-scale cooling circuits | Preferred material in EPC technical specifications |
| Industrial Cooling Systems | Central cooling water exchangers | High velocity water circulation | Handles higher water velocities than copper alloys |
| OEM Heat Exchanger Manufacturing | Shell & tube exchangers | Custom pressure & velocity designs | Globally accepted alloy for condenser tubing |
Standard Aluminium Brass Tubes Dimensional Chart
Note: Theoretical weights below are calculated values for Aluminium Brass condenser tubes (typ. density ≈ 8.44 g/cc) and are for engineering estimation only. Final supply weight can vary due to OD/WT tolerances, temper, and mill practice. For critical EPC jobs, freeze the exact OD/WT, tolerance class, and standard in the PO.
| Nominal OD | OD (mm) | OD (in) | Wall (mm) | ID (mm) | Theoretical Weight (kg/m) |
|---|---|---|---|---|---|
| 1/2" | 12.70 | 0.5000 | 1.0 | 10.70 | 0.311 |
| 12.70 | 0.5000 | 1.2 | 10.30 | 0.369 | |
| 12.70 | 0.5000 | 1.5 | 9.70 | 0.455 | |
| 12.70 | 0.5000 | 2.0 | 8.70 | 0.592 | |
| 5/8" | 15.88 | 0.6252 | 1.0 | 13.88 | 0.395 |
| 15.88 | 0.6252 | 1.2 | 13.48 | 0.469 | |
| 15.88 | 0.6252 | 1.5 | 12.88 | 0.580 | |
| 15.88 | 0.6252 | 2.0 | 11.88 | 0.756 | |
| 3/4" | 19.05 | 0.7500 | 1.0 | 17.05 | 0.479 |
| 19.05 | 0.7500 | 1.2 | 16.65 | 0.569 | |
| 19.05 | 0.7500 | 1.5 | 16.05 | 0.704 | |
| 19.05 | 0.7500 | 2.0 | 15.05 | 0.919 | |
| 7/8" | 22.22 | 0.8756 | 1.0 | 20.22 | 0.563 |
| 22.22 | 0.8756 | 1.2 | 19.82 | 0.669 | |
| 22.22 | 0.8756 | 1.5 | 19.22 | 0.829 | |
| 22.22 | 0.8756 | 2.0 | 18.22 | 1.082 | |
| 1" | 25.40 | 1.0000 | 1.0 | 23.40 | 0.647 |
| 25.40 | 1.0000 | 1.2 | 23.00 | 0.769 | |
| 25.40 | 1.0000 | 1.5 | 22.40 | 0.954 | |
| 25.40 | 1.0000 | 2.0 | 21.40 | 1.244 | |
| 1-1/8" | 28.58 | 1.1252 | 1.0 | 26.58 | 0.731 |
| 28.58 | 1.1252 | 1.2 | 26.18 | 0.869 | |
| 28.58 | 1.1252 | 1.5 | 25.58 | 1.078 | |
| 28.58 | 1.1252 | 2.0 | 24.58 | 1.406 | |
| 1-1/4" | 31.75 | 1.2500 | 1.0 | 29.75 | 0.815 |
| 31.75 | 1.2500 | 1.2 | 29.35 | 0.969 | |
| 31.75 | 1.2500 | 1.5 | 28.75 | 1.202 | |
| 31.75 | 1.2500 | 2.0 | 27.75 | 1.569 | |
| 1-1/2" | 38.10 | 1.5000 | 1.0 | 36.10 | 0.983 |
| 38.10 | 1.5000 | 1.2 | 35.70 | 1.169 | |
| 38.10 | 1.5000 | 1.5 | 35.10 | 1.451 | |
| 38.10 | 1.5000 | 2.0 | 34.10 | 1.894 |
