ASTM B111 C68700 Seamless Copper Alloy Tubes High Thermal Conductivity Corrosion Resistance for Heat Exchangers Boilers
ASTM B111 C68700 Seamless Copper Alloy Tubes
Cold-Drawn Precision Tubes for Efficient Heat Transfer Systems
Material & Performance Highlights
C68700 (Aluminum Brass, UNS C68700) is a copper-zinc alloy renowned for superior thermal conductivity, excellent seawater corrosion resistance, and biofouling inhibition. Ideal for condensers, marine heat exchangers, and boiler feedwater heaters.
Key Specifications
| Property | Value |
| Standards | ASTM B111, ASME SB111, EN 12451 |
| Outer Diameter | 10mm – 150mm (Custom Sizes Available) |
| Wall Thickness | 1mm – 15mm |
| Surface Finish | Cold-Drawn, Annealed, Polished |
Mechanical Properties
| Property | Minimum Value |
| Tensile Strength | 380 MPa |
| Yield Strength(0.2%) | 140 MPa |
| Elongation (%) | 45% |
| Hardness (Rockwell B) | ≤ 65 HRB |
Chemical Composition (%)
| Element | Cu | Zn | Al | As |
| C68700 | 76.0-79.0 | Bal. | 1.8-2.3 | 0.02-0.10 |
Manufacturing Process
Material Sourcing: High-purity copper billets from ISO 9001-certified suppliers.
Cold Drawing: Achieves tight tolerances (±0.1mm) and smooth internal surfaces.
Annealing: Controlled atmosphere annealing at 450°C – 550°C for ductility.
Quality Assurance: 100% Eddy Current Testing (ECT) and hydrostatic pressure tests.
Applications
✅ Power Plant Condenser Tubes
✅ Marine Heat Exchangers & Desalination Systems
✅ Refinery Cooling Towers
✅ HVAC Chiller Tubes
Why Choose YUHONG’s C68700 Tubes?
55 Production Lines: Guaranteed 12-day lead time for standard sizes.
Anti-Biofouling Design: Arsenic-doped alloy prevents microbial growth in seawater.
Certifications: EN 10204 3.2, KOSHA, and PED 2014/68/EU compliant.
FAQ
Q: How does C68700 compare to Admiralty Brass (C44300)?
A: C68700 offers 20% higher thermal conductivity and better resistance to dezincification.
Q: Maximum operating temperature in marine environments?
A: 220°C (428°F) with proper water treatment.
Q: Can you supply tubes with internal epoxy coating?
A: Yes – Custom coatings available upon request.
About YUHONG Holding Group
As a Top 5 Chinese Finned Tube Exporter with 20+ years of global expertise, YUHONG delivers excellence through:
55 Advanced Lines: Specializing in finned tubes, copper alloy tubes, and seamless boiler tubes.
20,000㎡ Facility: Equipped with automated cold-drawing mills and robotic polishing systems.
Global Reach: Serving 80+ countries with ISO 9001 and API 5CT certifications.
Discover our full portfolio at www.steelfintube.com or contact jimmy@steelseamlesspipe.com for tailored solutions.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.