ASTM B111 C68700 Copper Alloy Seamless Tube For Heat Exchanger And Evaporators

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. %):

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)

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

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

• Seawater Condensers & Heat Exchangers
• Resists dezincification and biofouling in saltwater.
• Used in ship cooling systems, offshore oil rigs, and desalination plants.
• Propulsion & Cooling Pipes
  • Withstands high-velocity seawater flow without erosion.

2. Power Generation

• Steam Condenser Tubes (Fossil & Nuclear Plants)
• Handles high-pressure steam and hot water (up to 260°C/500°F).
• Preferred in coal-fired, gas turbine, and nuclear power stations.
• Evaporators & Feedwater Heaters
  • Efficient heat transfer with minimal scaling.

3. Chemical & Petrochemical Industry

• Cooling Systems for Refineries
• Resists sulfides, chlorides, and ammonia in process fluids.
• Heat Exchangers for Acidic/Caustic Media
  • Aluminum content improves resistance to weak acids and alkalis.

4. HVAC & Refrigeration

• Chiller Tubes & Cooling Coils
  • High thermal conductivity improves energy efficiency.
• Brine & Glycol Cooling Systems
  • Compatible with antifreeze solutions.

5. Industrial Process Equipment

• Distillation Columns & Reboilers
• Used in ethanol, pharmaceutical, and food processing plants.
• Hydraulic & Pneumatic Systems
• Hard-drawn (H55/H58) tubes handle high-pressure fluids.

Why Choose C68700 Over Other Copper Alloys?

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).

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.