ASTM B111 C68700 Seamless Copper Alloy Tubes
Cold-Drawn Precision Tubes for Efficient Heat Transfer Systems

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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

Mechanical Properties

Chemical Composition (%)

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.

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.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

Our factories main products as below : 
Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

Yuhong Holding Group also has gained rich experience for project package( products contain:Pipes, Fittings, Flanges, heat exchanger, furnace, fired heater, air cooler, boiler) , YUHONG brand has marked its global presence in more than 85 countries, like, Korea, USA, Canada, Mexico, Colombia, Bolivia, Chile, Argentina, Brazil, Ecuador, Austria, New Zealand, Singapore, Malasyia, Indonesia, Thailand, Vietnam, Ukraine, Turkey,Sauid Arabia, Qatar, U.A.E,Israel,India, UK, France, Italy, Gernmany, Poland, Spain,... We have successfully implemented the orders of Cross Country Pipelines for our valuable customers. In addition, we have also developed a huge network of contacts and strategic alliances with most important manufacturers as stockists around the world.