Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of UNS C68700 Aluminum Brass Tube (ASTM B111) – Marine & Heat Exchanger Grade in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
The Most Cost-Effective Seawater Corrosion Resistant Brass for Condenser Systems
UNS C68700 (Aluminum Brass) is a high-performance copper-zinc-aluminum alloy engineered for high-velocity seawater, condenser, and heat exchanger applications.
Compared with standard brasses, C68700 forms a protective aluminum oxide film that significantly improves resistance to:
impingement corrosion
seawater erosion
biofouling attack
dezincification failure
This makes it one of the most widely used materials in power plant condensers, desalination systems, and marine cooling equipment.
01
High Quality
02
Advanced Equipment
03
Professional Team
04
Custom Service
What is UNS C68700
This alloy is part of the brass family (copper-zinc) with the addition of aluminum and a small amount of arsenic . The aluminum significantly improves its resistance to corrosion, especially in seawater and other saline environments . The addition of arsenic helps inhibit dezincification, a common form of corrosion in brass . It also possesses good overall strength and maintains excellent formability for cold working processes
Keywords: UNS C68700, Aluminum Brass, CuZn20Al2As, CW702R, ASTM B111 Aluminum Brass Tube, Admiralty Brass, Marine condenser tube, Heat exchanger tubing.
Why Global Engineers Choose C68700 (Not Ordinary Brass)
In real seawater systems, material failure usually comes from:
high flow velocity erosion
chloride corrosion
dezincification cracking
biofouling accumulation
C68700 solves these problems through a dual protection mechanism:
Aluminum (1.8–2.5%) → forms stable Al₂O₃ protective film
Arsenic trace → prevents dezincification
👉 Result: longer service life + lower maintenance cost
Why C68700 Matters
Many condenser failures are caused by:
velocity corrosion (erosion-corrosion)
tube thinning
pitting in chloride water
C68700 is specifically designed to reduce:
downtime
tube replacement frequency
maintenance cost per year
Supply Condition & Processing
We supply C68700 tubes in:
annealed / O61 condition
drawn / hardened condition
ASTM B111 compliant manufacturing
custom OD / wall thickness / length
C68700 vs Other Copper Alloys (Engineering Decision Guide)
vs C44300 Admiralty Brass → C68700 offers higher resistance to high-velocity seawater
vs C70600 Copper Nickel → C68700 provides 30–50% lower material cost
vs C12200 Copper → C68700 survives chloride + marine conditions
👉 Ideal choice: middle-cost but high-performance seawater solution
Chemical Composition (Typical %)
| Element | Cu | Zn | Al | As | Pb | Fe | Others |
|---|---|---|---|---|---|---|---|
| Percentage (%) | 76.0 – 79.0 | 20.0 – 22.0 | 0.50 – 2.50 | 0.02 – 0.06 | ≤0.05 | ≤0.10 | Balance |
Product Forms & Standard Sizes
1. Seamless Tube / Condenser Tube (ASTM B111 / B234)
| OD (inch) | OD (mm) | Wall Thickness (mm) | Length | Finish | Application |
|---|---|---|---|---|---|
| 1/4″ | 6.35 | 0.7 | 3 – 6 m | Bright Annealed | Condenser & Heat Exchanger |
| 3/8″ | 9.52 | 0.9 | 3 – 6 m | Mill Finish | Marine coolers |
| 1/2″ | 12.7 | 1.0 | 3 – 6 m | Smooth | Seawater piping |
| 3/4″ | 19.05 | 1.5 | 3 – 6 m | Plain End | Oil refinery cooling system |
| 1″–2″ | 25.4 – 50.8 | 1.5 – 3.0 | 3 – 6 m | Polished | Power station condensers |
2. Plate & Sheet (ASTM B171)
| Thickness (mm) | Width (mm) | Length (mm) | Finish | Application |
|---|---|---|---|---|
| 1.0 – 3.0 | 600 – 1200 | 2000 – 3000 | Mill Finish | Tube sheet plates |
| 5.0 – 25.0 | 600 – 1500 | 2000 – 6000 | Hot Rolled |
Heat exchanger base plates |
3. Rod & Bar (ASTM B111 / B124)
| Diameter (mm) | Length | Temper | Application |
|---|---|---|---|
| 6 – 100 | 3 m | H02 / H04 | Fasteners, marine valves, shafts |
4. Coil / Strip (ASTM B36)
| Thickness | Width | Coil Weight | Application |
|---|---|---|---|
| 0.3 – 2.0 mm | 10 – 400 mm | 50 – 250 kg | Flexible tubing, sealing gaskets |
Products Applications
Power Generation
Steam turbine condensers
Cooling water heat exchangers
Marine Engineering
Seawater cooling systems
Offshore platforms
Desalination Plants
High salinity brine systems
Multi-stage flash evaporators
HVAC & Industrial Cooling
Large chillers
Central cooling systems
FAQ
Q1: What's the difference between Aluminum Brass (C68700) and Admiralty Brass (C44300)?
A1: C68700 contains aluminum, which improves resistance to seawater corrosion and impingement, making it superior for high-velocity seawater environments.
Q2: Can C68700 tubes be used for brackish or polluted seawater?
A2: Yes. The aluminum and arsenic content provide enhanced protection against biofouling and dezincification in polluted or brackish water.
Q3: What testing certificates are provided?
A3: Mill Test Certificate (EN 10204 3.1), Chemical Analysis, Mechanical Properties, Eddy Current, and Hydrostatic Test reports are available.
Q4: Is C68700 Aluminum Brass suitable for welding?
A4: Yes, it can be welded by TIG or brazing methods with proper filler metals and pre-cleaning.
Inspection & Quality Assurance
All C68700 products are supplied with:
Chemical composition test report (MTC)
Mechanical property testing
Eddy current inspection
Hydrostatic pressure test
Third-party inspection available (SGS / BV on request)
Looking for a dependable UNS C68700 Aluminum Brass supplier?
We supply seamless tubes, plates, rods, and coils that meet ASTM B111, B171, and EN CW702R standards for marine and industrial heat exchanger applications.
To receive pricing and technical support, please provide:
Required tube size (OD / wall thickness)
Application (condenser / seawater / HVAC)
Quantity (kg or tons)
Delivery port
👉 We will respond with:
Best price
Technical recommendation
Delivery time
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
Hot Tags: UNS C68700 Aluminum Brass Tube (ASTM B111) – Marine & Heat Exchanger Grade, China UNS C68700 Aluminum Brass Tube (ASTM B111) – Marine & Heat Exchanger Grade manufacturers, suppliers, factory, ASTM B43 Seamless Red Brass Pipe, UNS C44300 Copper Zinc Tin Alloys, UNS C26800 Yellow Brass Copper Alloy, UNS C17300 Beryllium Copper Alloys, ASTM B75 Seamless Copper Tube, UNS C46400 Naval Brass Copper Alloy
