ASTM B111 C68700 Tube – UNS C68700 (Aluminum Brass Tube)
ASTM B111 C68700 Tube, identified as UNS C68700, is widely known as Aluminum Brass Tube and is specifically engineered for condenser and heat exchanger applications operating in aggressive water environments. This alloy is a copper-zinc-aluminum composition with controlled additions of arsenic, designed to provide excellent resistance to corrosion, dezincification, and erosion caused by high-velocity seawater. ASTM B111 UNS C68700 tubes are manufactured in seamless form and are extensively used in power plants, marine condensers, desalination units, and offshore systems where reliability and long service life are critical.
Key Features
- Excellent resistance to seawater and brackish water corrosion
- High resistance to dezincification and erosion-corrosion
- Superior thermal conductivity for efficient heat transfer
- Seamless construction for uniform strength and performance
- Good mechanical strength and durability
- Long service life with reduced maintenance costs
ASTM B111 C68700 Tube Specification
| Parameter | Details |
|---|---|
| Standard | ASTM B111 |
| UNS Number | C68700 |
| Alloy Type | Aluminum Brass |
| Form | Seamless Tube |
| Condition | Annealed |
| Manufacturing Process | Cold Drawn |
| Surface Finish | Mill Finish / Bright Annealed |
| Testing | Eddy Current, Hydrostatic, Dimensional |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | C68700 |
| EN | CuZn20Al2 |
| DIN | 2.0460 |
| ISO | CuZn20Al2 |
Sizes
- Outside Diameter: 6 mm to 114.3 mm
- Wall Thickness: 0.7 mm to 6 mm
- Length: Up to 6 meters, random or cut lengths available
- Form: Straight lengths and U-bend tubes
ASTM B111 C68700 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Copper (Cu) | 76.0 – 79.0 |
| Zinc (Zn) | Balance |
| Aluminum (Al) | 1.8 – 2.5 |
| Arsenic (As) | 0.02 – 0.06 |
| Iron (Fe) | Max 0.06 |
| Lead (Pb) | Max 0.07 |
C68700 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 360 MPa |
| Yield Strength | ≥ 125 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 90 HRB |
UNS C68700 Physical Properties
| Property | Value |
|---|---|
| Density | 8.35 g/cm³ |
| Melting Point | ~930°C |
| Thermal Conductivity | ~110 W/m·K |
| Electrical Conductivity | ~26% IACS |
Type of C68700 Pipe & Tubes
- C68700 Seamless Tubes
- C68700 U-Bend Tubes
- Condenser Tubes
- Heat Exchanger Tubes
Applications
- Surface Condensers
- Marine Condensers
- Heat Exchangers
- Power Plants
- Desalination Plants
- Offshore Oil & Gas Platforms
- Shipbuilding
- Industrial Cooling Water Systems
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