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| Brand Name: | YUHONG |
| Model Number: | ASTM B111 UNS C68700 Copper Aluminum Brass Tube |
| MOQ: | 500kgs |
| Price: | NEGOTIABLE |
| Payment Terms: | L/C,T/T |
ASTM B111 UNS C68700 / CuZn20Al2 / 2.0460 Aluminum Brass Seamless Tube
C68700 is an arsenical aluminum brass - a specialized copper alloy engineered specifically for marine and aggressive water environments. Known commercially as "Aluminum Brass," this material represents a significant advancement over traditional brass alloys through strategic alloying that dramatically enhances corrosion resistance.
Key Characteristics & Advantages
Excellent Corrosion Resistance: The aluminum oxide layer provides outstanding performance in:
Seawater (primary application)
Brackish water
High-velocity or turbulent fresh water
Resistance to stress corrosion cracking is good, especially in annealed condition.
Good Heat Transfer: High thermal conductivity ensures efficient heat exchange, which is the primary function of condenser tubes.
Moderate Strength & Good Fabricability: Can be bent, expanded, and flared, especially in the annealed temper.
Biofouling Resistance: The aluminum oxide film provides some inherent resistance to marine organism attachment.
Cost-Effective: More economical than copper-nickel alloys (e.g., 90/10, 70/30) or titanium, while offering a good balance of performance for many marine environments.
Equivalent Grades of Copper Alloys
| Material Designation | Corresponding Material Symbol | ||||
| GB/T8890 | ASTM B111 | BS2871 | JIS H3300 | DIN1785 | |
| Copper-Nickel | BFe10-1-1 | C70600 | CN102 | C7060 | CuNi10Fe1Mn |
| BFe30-1-1 | C71500 | CN107 | C7150 | CuNi30Mn1Fe | |
| (BFe30-2-2) | C71640 | CN108 | C7164 | CuNi30Fe2Mn2 | |
| (BFe5-1.5-0.5) | C70400 | – | – | – | |
| B7 | – | – | – | – | |
| Aluminums Brass | HAL77-2 | C68700 | CZ110 | C6870 | CuZn20Al2 |
| Admiralty Brass | HSn70-1 | C44300 | CZ111 | C4430 | CuZn28Sn1 |
| Boric Brass | Hsn70-18 | – | – | – | – |
| HSn70-1 AB | – | – | – | – | |
| Arsenical Brass | H68A | – | CZ126 | – | – |
| Brass Tube | H65/H63 | C28000/C27200 | CZ108 | C2800/C2700 | CuZn36/CuZn37 |
Chemical Composition of Copper Alloys
| Designation | Chemical Composition % | ||||||||
| Cu | Sn | Al | As | Ni | Fe | Mn | Pb max. | Zn | |
| C44300 | 70.0-73.0 | 0.9-1.2 | – | 0.02-0.06 | – | 0.06 max | – | 0.07 | Rem |
| C68700 | 76.0-79.0 | – | 1.8-2.5 | 0.02-0.06 | – | 0.06 max | – | 0.07 | Rem |
| C70400 | Rem | – | – | – | 4.8-6.2 | 1.3-1.7 | 0.3-0.8 | 0.05 | 1.0max |
| C70600 | Rem | – | – | – | 9.0-11.0 | 1.0-1.8 | 1.0max | 0.05 | 1.0max |
| C71500 | Rem | – | – | – | 29.0-33.0 | 0.4-1.0 | 1.0max | 0.05 | 1.0max |
| C71640 | Rem | – | – | – | 29.0-32.0 | 1.7-2.3 | 1.5-2.5 | 0.05 | 1.0max |
Tensile Requirements:
| Copper or Copper Alloy UNS NO. | Temper Designation | Tensile Strength | Yield Strength | |
| Standard | Former | min ksi | min ksi | |
| C44300 | O61 | annealed | 45 | 15 |
| C68700 | O61 | annealed | 50 | 18 |
| C70400 | H55 | light-drawn | 38 | 30 |
| C70600 | H55 | light-drawn | 45 | 15 |
| C71500 | O61 | annealed | 52 | 18 |
| C71640 | O61 | annealed | 63 | 25 |
QUICK SELECTION GUIDE
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Choose C68700 when: Clean seawater or brackish water (open ocean quality)
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Choose C70600 (90/10 CuNi) when: Moderate water quality (some pollution risk)
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Choose C71500 (70/30 CuNi) when: Poor to moderate water quality
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Choose Titanium when: Severely polluted or sulfide-laden water |
Application
Condenser and Heat Exchanger Tubes in:
Power Plants (fossil fuel, nuclear - for the main surface condenser)
Marine Vessels (shipboard condensers, oil coolers)
Desalination Plants (Multi-Stage Flash and Multi-Effect Distillation heat recovery sections)
Offshore Platforms (cooling systems)
Chemical and Petrochemical Processing coolers.
Address
20 Floor, No.1 New World Building, NO.1018 Min'an Road, Yinzhou District, Ningbo, China, ZIP:315040
Tel
+86-574-88013900
