What Is Aluminum Brass?
Aluminum brass tubes (CuZn20Al2 / UNS C68700) resist the action of high-velocity salt and brackish water and are commonly used for condenser tubes. The main characteristic of CuZn20Al2 / C68700 is its high resistance to impingement attack. Tubes of this alloy are recommended for use in marine and land power stations where cooling-water velocities are high.
The alloy combines high strength and general corrosion resistance with low susceptibility to stress-corrosion cracking, making it a highly preferred material for condenser and heat-exchanger service. Tubes can be used in the hard-drawn condition and can be heat treated to ensure freedom from stress-corrosion cracking.
Chemical Composition (CuZn20Al2, wt%)
| Element | Content |
|---|---|
| Copper (Cu) | 76.0–79.0 |
| Zinc (Zn) | Balance (≥ 15) |
| Aluminum (Al) | 1.8–2.3 |
| Arsenic (As) | 0.02–0.06 |
| Manganese (Mn) | ≤ 0.1 |
| Lead (Pb) / Iron (Fe) / Nickel (Ni) | ≤ 0.07 / ≤ 0.07 / ≤ 0.1 |
International Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM B111 (USA) | C68700 |
| EN 12451 | CuZn20Al2As |
| DIN (historical) | 17660 / 1785, CuZn20Al2 |
| BS 2871 | CZ 110 |
| JIS H3300 | C6870 |
| GB/T 8890 | HAl77-2 |
Mechanical Properties (Typical)
| Condition | Yield Strength (N/mm²) | Tensile Strength (N/mm²) | Elongation |
|---|---|---|---|
| O61 (annealed) | ≥ 125 | ≥ 345 | ≥ 45% |
| R390 (hard) | ≥ 150 | ≥ 390 | ≥ 40% |
Melting point: 935 °C. Density (20 °C): 8.33 g/cm³. Hot working: OK; cold working: very good.
Why Arsenic Matters
The addition of arsenic (0.02–0.06%) solves the problem of dezincification - the selective leaching of zinc that would otherwise weaken the alloy in saline service. This makes CuZn20Al2 the most-used copper alloy for heat-exchanger tubes and the best option for any heat exchanger involving saline water.
Applications
Condenser and heat-exchanger tubes in marine power stations and land power plants.
Cooling-water systems handling high-velocity seawater or brackish water.
Desalination plants and shipboard heat exchangers.
Copper products that GNEE can provide
| Product Name | Copper Pipe |
| Standard | ASTM,JIS,DIN,GB,AISI,DIN,EN |
| Material | T1, T2, T3, C21000, C22000, C22600, C23000, C24000, C26000, C26130, C26800, C27000, C27200, C46500, C51000, C52100, C53400, C61300, C61400, C63000, C63800, C65100, C65500, H63, H65, H68, H70, H80, H85, H90, H96. |
| Purity | 99.9% |
| Technique | Cold drawn, hot rolled, cold rolled and others. |
| Side shape | Round, Square, Rectangular, ect |
| Outer Diameter | 6.35-406mm or Customizable |
| Thickness | 0.5-80mm or Customizable |
| Length | 1-12m or Customizable |
| Surface Treatment | Coating, Oxidation, Coating, Polishing, etc. |
| Type | Seamless, Welded |
| Origin | China |
| Delivery Time | 7-15 days, depending on the situation and quantity |
| Price Terms | EXW, FOB, CIF, CRF, CNF or others |
| Loading Port | Any port in China |
| Payment Term | TT, LC,Cash, Paypal, DP, DA,Western Union or Others. |
| Application | 1. Construction industry2. Mechanical production, energy extraction3. Home appliance industry, refrigeration industry, transportation industry, home decoration and bathroom4. Communication technology, infrastructure, municipal pipeline network, etc. |
| Packaging | Bundle, PVC Bag, Nylon Belt, Cable Tie, Standard export seaworthy package or as Reque |
| Processing Servic | Bending, Welding, Decoiling, Punching, Cutting and Others |
| Tolerance | ±1% |
|
Standard |
ASTMB152,B187,B133,B301,B196,B441,B465,JISH3250-2006, |
|
Material |
C10100,C10200,C10300,C10400,C10500,C10700,C10800,C10910,C10920, |
|
Diameter |
3mm~800mm |
|
Length |
1.0m 5.8m,6m,or as required |
|
Export to |
Singapore,India,Poland,Indonesia,Ukraine,Spain,Korea,Thailand,Canada,USA, |
|
Container Size |
20ft GP:5898mm(Length)x2352mm(Width)x2393mm(High) |
|
Price Term |
Ex-work, FOB, CFR, CIF, etc. |
|
Application |
Copper bar is widely used in boat building,War industry, Car industry and communication |
|
Package |
Standard export seaworthy package,suit for all kinds of transport,or as required. |
|
Contact |
If you have any question,please feel free to contact me. |
|
Product name |
Copper Strip / Copper tape / Copper sheets coil |
|
Shape |
strip,tape,band,coil,roll |
|
Standard |
ASTM, ISO, JIS, DIN, GB, EN |
|
Grade |
ASTM:C10100,C10200,C10300,C10400,C10500,C10700,C10800,C10910,C10920, |
|
MOQ |
300KG |
|
Temper |
1/4 hard,1/2hard,full hard,soft,etc |
|
Surface |
Mill finish, polished, anodizing, brushing, sand blasting, powder coating,etc |
|
Payment terms |
T/T,L/C,western union, Paypal |
|
Price terms |
CIF,CFR,FOB,CIF,EXW,CNF |
|
Width |
0.1-1500mm or customized |
|
Thickness |
0.1-50mm or customized |
|
Package |
Standard export seaworthy package or as required. |
|
Delivery time |
About 7~10 working days after deposit received |
|
Application |
1)Further making utensil. |
|
Product Name |
Copper Wire |
|
Type |
Insulated |
|
Payment term |
TT/Trade Insurance/Credit card |
|
Delivery time |
7-30days( Depend on the quantity) |
|
Shipping terms |
FOB CIF DDP EXW |
|
Thermal Class |
130/155/180/200/220 C |
|
Diameter |
0.04mm-6.0mm |
|
Enameled Type |
Polyester/Polyurethane/Polyesterimide/Polyamide-imide |
|
Application |
Motor Transformer Fan Speaker |
|
Conductor content |
99% |
Copper CNC machined parts
|
Product Name |
Copper Wire |
|
Type |
Insulated |
|
Payment term |
TT/Trade Insurance/Credit card |
|
Delivery time |
7-30days( Depend on the quantity) |
|
Shipping terms |
FOB CIF DDP EXW |
|
Thermal Class |
130/155/180/200/220 C |
|
Diameter |
0.04mm-6.0mm |
|
Enameled Type |
Polyester/Polyurethane/Polyesterimide/Polyamide-imide |
|
Application |
Motor Transformer Fan Speaker |
|
Conductor content |
99% |
About Us
Founded in 2008, we specialize in exporting premium copper products. Our manufacturing leverages continuous casting lines and precision drawing machines. Rigorous quality control, including eddy current testing and spectrometer analysis, guarantees the superior performance of our copper tubes and coils for global applications.
If you need any help, please contact us immediately!
Email address：sales@gneemetal.com
Square Meters Built
Enterprise Employees
Cooperating Partner
Years Experience
