YUHONG HOLDING GROUP CO., LTD
| Payment Terms | TT, LC |
| Supply Ability | According to Clients' requirements |
| Delivery Time | 35-60 Days (Depend on Customer's Requirements) |
| Packaging Details | Ply-wooden Cases with Plastic Caps on Tube's Both Ends |
| Product Name | Copper Alloy Steel / Arsenical Aluminum Brass Seamless Tube |
| Tube Specification | ASTM B111 |
| Tube material | C68700 |
| Tube's OD | Customsized |
| Tube's Wall Thickness | Customsized |
| Tube's End | Plain end |
| Tube's length | Depend on Customer |
| Application | Condensers and Heat Exchangers;Power Plant Condensers; Cooling Systems; Heat Transfer Equipment |
| Brand Name | Yuhong |
| Model Number | ASTM B111 C68700 Seamless Tube |
| Certification | ABS, BV, DNV, CCS, LR |
| Place of Origin | China |
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Product Specification
| Payment Terms | TT, LC | Supply Ability | According to Clients' requirements |
| Delivery Time | 35-60 Days (Depend on Customer's Requirements) | Packaging Details | Ply-wooden Cases with Plastic Caps on Tube's Both Ends |
| Product Name | Copper Alloy Steel / Arsenical Aluminum Brass Seamless Tube | Tube Specification | ASTM B111 |
| Tube material | C68700 | Tube's OD | Customsized |
| Tube's Wall Thickness | Customsized | Tube's End | Plain end |
| Tube's length | Depend on Customer | Application | Condensers and Heat Exchangers;Power Plant Condensers; Cooling Systems; Heat Transfer Equipment |
| Brand Name | Yuhong | Model Number | ASTM B111 C68700 Seamless Tube |
| Certification | ABS, BV, DNV, CCS, LR | Place of Origin | China |
| High Light | Evaporators Seamless Tube ，Heat Exchanger Seamless Tube ，ASTM B111 Seamless Tube | ||
ASTM B111 C68700 Copper Alloy Seamless Tube For Heat Exchanger and Evaporators
ASTM B111 C68700 Seamless Tube – Overview
ASTM B111 C68700 refers to seamless brass tubes made from Arsenical Aluminum Brass (UNS C68700), designed primarily for condensers, heat exchangers, and marine applications. This standard specifies requirements for dimensions, mechanical properties, and chemical composition.
1. Key Features
(1). Chemical Composition (UNS C68700 / ASTM B111)
The composition is specified in weight percentages (wt. %):
| Element | Composition (wt. %) |
| Copper (Cu) | 76.0 – 79.0% |
| Zinc (Zn) | Remainder (balance) |
| Aluminum (Al) | 1.8 – 2.5% |
| Arsenic (As) | 0.02 – 0.10% |
| Iron (Fe) | ≤ 0.06% |
| Lead (Pb) | ≤ 0.07% |
| Other Impurities | ≤ 0.5% (total) |
Notes:
The arsenic (As) addition improves corrosion resistance, especially in seawater.
Aluminum (Al) enhances strength and oxidation resistance.
(2). Mechanical Properties (ASTM B111 C68700 Seamless Tube)
| Property | Condition | Value |
| Tensile Strength (min) | Annealed (O60) | ≥ 380 MPa (55,000 psi) |
| Hard Drawn (H55, H58) | ≥ 485 MPa (70,000 psi) | |
| Yield Strength (0.5% extension, min) | Annealed | ≥ 125 MPa (18,000 psi) |
| Hard Drawn | ≥ 345 MPa (50,000 psi) | |
| Elongation (min, % in 50mm) | Annealed | ≥ 45% |
| Hard Drawn | ≥ 10% | |
| Hardness (Rockwell B, typical) | Annealed | ~55 HRB |
| Hard Drawn | ~80 HRB | |
| Max. Working Temperature | — | ~260°C (500°F) |
Notes:
Annealed (O60): Soft, ductile, suitable for bending/flaring.
Hard Drawn (H55/H58): Higher strength, used for pressure applications.
Corrosion Resistance: Excellent in seawater, steam, and condensate systems.
2. Equivalent Standards
| Standard | Equivalent Material |
| UNS | C68700 |
| EN (Europe) | CW702R |
| DIN (Germany) | CuZn20Al2As |
| JIS (Japan) | C6870 |
3. Why Choose ASTM B111 C68700 Tubes?
✅ Excellent corrosion resistance (especially in seawater).
✅ High thermal conductivity (good for heat exchangers).
✅ Good mechanical strength (even at elevated temperatures).
✅ Seamless construction (no weak points from welding).
The ASTM B111 C68700 seamless tube (Arsenical Aluminum Brass) is specifically engineered for demanding environments where corrosion resistance, thermal conductivity, and mechanical strength are critical. Here are its primary applications:
1. Marine & Offshore Systems
2. Power Generation
3. Chemical & Petrochemical Industry
4. HVAC & Refrigeration
5. Industrial Process Equipment
Why Choose C68700 Over Other Copper Alloys?
| Feature | C68700 (Arsenical Aluminum Brass) | Admiralty Brass (C44300) | Cupronickel (C70600) |
| Seawater Resistance | Excellent (As prevents dezincification) | Good (needs inhibitors) | Superior (best for high salinity) |
| Strength | High (Al adds strength) | Moderate | Moderate |
| Cost | Mid-range | Lower | Higher |
| Thermal Conductivity | Very High | High | Lower |
Key Advantages for These Applications
✔ Corrosion Resistance – Arsenic (As) and aluminum (Al) protect against saltwater, steam, and chemicals.
✔ Pressure Tolerance – Seamless construction avoids weak welds.
✔ Easy Fabrication – Can be bent, flared, or expanded (annealed condition).
Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n... Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n...
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