ASTM B111 UNS C68700 Seamless Aluminum Brass Tubes
ASTM B111 C68700 Aluminum Brass Tube Supplier
ASTM B111 C68700 aluminum brass tube is a seamless copper alloy tube widely used in condensers, heat exchangers, evaporators, and seawater desalination systems. With excellent resistance to seawater corrosion, high thermal conductivity, and reliable mechanical strength, C68700 tubes are ideal for marine and industrial cooling applications.
Our ASTM B111 C68700 aluminum brass tubes are manufactured according to international standards and are available in various sizes and specifications for power plants, shipbuilding, petrochemical industries, and offshore engineering projects.
What is ASTM B111 C68700 Aluminum Brass Tube?
C68700 aluminum brass is a copper-zinc alloy containing aluminum and arsenic, specially developed for seawater service applications. The aluminum content forms a protective oxide film on the tube surface, significantly improving resistance to corrosion, erosion, and biofouling in marine environments.
Equivalent Standards:
- ASTM B111 C68700
- EN 12451 CuZn20Al2As
- JIS H3300 C6870
Chemical Composition of C68700 Aluminum Brass
| Element | Content (%) |
|---|---|
| Copper (Cu) | 76.0 – 79.0 |
| Aluminum (Al) | 1.8 – 2.5 |
| Arsenic (As) | 0.02 – 0.06 |
| Iron (Fe) | 0.06 Max |
| Lead (Pb) | 0.07 Max |
| Zinc (Zn) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 345 MPa |
| Yield Strength | ≥ 125 MPa |
| Density | 8.33 g/cm³ |
| Thermal Conductivity | 100.4 W/m·K |
| Melting Point | 932 – 971°C |
Temper: O61 Annealed
Advantages of C68700 Aluminum Brass Tube
Excellent Seawater Corrosion Resistance
C68700 aluminum brass tubes are highly resistant to corrosion and erosion in seawater and brackish water environments, making them suitable for marine cooling systems and desalination plants.
High Thermal Conductivity
The alloy provides efficient heat transfer performance for condensers and heat exchangers.
Good Mechanical Strength
C68700 offers reliable strength and durability under demanding operating conditions.
Good Fabrication Performance
The material is suitable for cutting, bending, expanding, welding, and machining processes.
Long Service Life
The protective oxide layer formed by aluminum improves tube lifespan in aggressive environments.
Applications of ASTM B111 C68700 Tube
C68700 aluminum brass tubes are widely used in:
- Condenser tubes
- Heat exchanger tubes
- Evaporator tubes
- Distiller tubing
- Power plant cooling systems
- Seawater desalination plants
- Offshore platforms
- Marine engineering equipment
- Petrochemical industries
C68700 vs C44300
| Grade | Main Feature | Typical Application |
|---|---|---|
| C68700 Aluminum Brass | Superior seawater corrosion resistance | Marine condensers and desalination |
| C44300 Admiralty Brass | Good corrosion resistance in moderate conditions | Power plants and freshwater condensers |
Tube Supply Range
We can supply:
- Seamless aluminum brass tubes
- Straight lengths and U-bend tubes
- Heat exchanger tubes
- Condenser tubes
- Custom sizes on request
Available according to ASTM B111, ASME SB111, and EN standards.
Inspection and Testing
All tubes can be supplied with:
- Hydrostatic Test
- Eddy Current Test
- PMI Inspection
- Mechanical Property Test
- Third-Party Inspection
Packaging
Standard export seaworthy packing:
- Wooden cases
- Bundles with plastic caps
- Customized packing available
FAQ
Is C68700 suitable for seawater applications?
Yes. C68700 aluminum brass tube is specifically designed for seawater service and offers excellent resistance to seawater corrosion and erosion.
What is the difference between C68700 and copper nickel tubes?
C68700 aluminum brass provides excellent thermal conductivity and cost efficiency, while copper nickel alloys offer higher resistance in extremely aggressive seawater conditions.
What standard covers C68700 tubes?
ASTM B111 is the main international standard for seamless condenser and heat exchanger tubes made from copper alloys including C68700.
What are the common applications of C68700 tubes?
Typical applications include condensers, heat exchangers, evaporators, marine cooling systems, and desalination plants.
ASTM B111 Copper Alloy Tube Grades
- ASTM B111 C44300 Admiralty Brass Tube
- ASTM B111 C68700 Aluminum Brass Tube
- ASTM B111 C70600 90/10 Copper Nickel Tube
- ASTM B111 C71500 70/30 Copper Nickel Tube
How to Order ASTM B111 C68700 Tube?
Example:
ASTM B111 C68700 Seamless Tube
25.4 mm OD × 0.7 mm WT × 3500 mm Length
How to order the ASTM B111 C68700 tube?
Example#1, ASTM B111 C68700 Seamless tube, 25.4 x 0.7 (AVG.) x 3500mm
