Products Description
Product Specifications
| Standards | ASTM B111 / ASME SB111 |
| Steel Grades | UNS C68700 |
| Equivalent Standards | EN CuZn20Al2As / BS CZ110 / JIS C6870 |
| Outer Diameter (OD) | 5mm–219mm |
| Wall Thickness (WT) | 0.5mm-15mm |
| Length | Up to 12 m |
| Surface Treatment | Bright annealed |
| Production Process | Hot extrusion + cold drawing + U-bending |
| Condition | Annealed (O61 condition) |
The thermal conductivity of C68700 Aluminum Brass Tube reaches 100 W/(m·K)-significantly higher than that of stainless steel (typically 15–25 W/m·K)-enabling faster heat exchange and reducing energy consumption in heat transfer processes.
C68700 exhibits exceptional resistance to impingement corrosion in high-velocity seawater and sand-laden saline water, making it ideally suited for applications in both marine and land-based power plants characterized by high cooling water flow rates.
The trace amount of arsenic (0.02–0.10%) present in C68700 acts as a dezincification inhibitor, effectively preventing the phenomenon of dezincification corrosion in brass when exposed to seawater.
Customized Services
- TORICH offers custom U-bend tube services, allowing for the customization of dimensions-including bend radius, bend spacing, and straight leg lengths-based on drawings or parameter specifications provided by the client. We are capable of processing U-tube bundles with single or multiple bends to accommodate diverse condenser structural designs.
- We provide a variety of surface treatments, such as Bright Annealing (BA), pickling and passivation, and anti-rust coatings.
- In addition to the standard annealed temper (O61), we can supply tubes in various other temper conditions-including light-drawn, hard-drawn, and half-hard-upon customer request.
Chemical Composition
| Element | Cu | Zn | Al | Fe | Mn | Others |
| C68700 | 76.0 – 79.0 | Balance | 1.8 – 2.5 | 0.02 – 0.06 | 0.02 – 0.10 | ≤ 0.1 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| C68700 (Annealed) | 310 – 430 | ≥ 105 | ≥ 30 | 50 – 80 |
Possible Alternative Grades
- C44300 (Naval Brass):Offers good cost-effectiveness and is suitable for seawater environments of moderate severity; however, its resistance to high-velocity erosion is relatively weak.
- C70600 (90/10 Copper-Nickel Alloy):Possesses excellent resistance to marine corrosion; it is the preferred material for highly corrosive seawater environments, though its material cost is relatively high.
- C71500 (70/30 Copper-Nickel Alloy):Best suited for extreme marine environments and high-temperature operating conditions, but it is significantly more expensive.
- 316L Stainless Steel:Exhibits good overall corrosion resistance; however, its low thermal conductivity results in relatively low heat transfer efficiency in condenser applications.
application areas
ASTM B111 C68700 Aluminum Brass U-tubes are engineered for high heat transfer efficiency and corrosion resistance, making them suitable for demanding cooling environments-particularly those involving seawater or highly corrosive cooling media. Typical applications include:
- Power Generation Industry: Surface condensers in thermal power plants, steam turbine exhaust condensation systems, etc.
- Marine & Offshore Engineering: Onboard condenser systems and heat exchangers.
- Petrochemical & Industrial Processing: Condensers and evaporators in chemical plants, cooling systems in fertilizer and ammonia production facilities, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What is the difference between C68700 and stainless steel?
A: C68700 possesses higher thermal conductivity and superior resistance to fouling.
Q: Are C68700 aluminum brass tubes suitable for use in seawater with a high sand content?
A: No, it is not recommended. While C68700 exhibits excellent erosion resistance in clean seawater, a high sand content causes sand particles to abrade the protective oxide film, thereby accelerating corrosion. For cooling applications involving sandy seawater, it is recommended to select C70600 or C71500 alloy tubes instead.
Q: Can C68700 tubes be welded?
A: Yes, they can. C68700 is suitable for various welding processes, including brazing, gas welding, resistance welding, and gas-shielded arc welding; however, electroslag welding and submerged arc welding are not recommended.
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