C68700 Aluminum Brass
Common Names: Aluminum Brass, ARS Brass
UNS Number: C68700
Forms: Sheet, Strip, Tube (Seamless/Welded), Rod, Wire
Certification: ISO 9001, SGS test report, material certificate (MTC)
C68700 aluminum brass, with its 76%-79% copper matrix and environmentally friendly low-arsenic formula, combines 23% electrical conductivity with high strength of 550-700 MPa. Its aluminum-arsenic synergistic protective layer offers excellent corrosion resistance in seawater and chemical environments, making it a preferred material for marine condenser tubes and lightweight aviation components.
Performance Advantages
Environmental Benefits
The low-arsenic/arsenic-free formula complies with regulations such as EU REACH and China RoHS, reducing environmental and health risks.
Corrosion Resistance
The aluminum-arsenic synergistically forms a dual-action protective layer, providing outstanding resistance to pitting corrosion and stress corrosion cracking.
Strength and Lightweight
Its high specific strength (strength-to-density ratio) makes it suitable for replacing some steel components in the marine and aviation industries.
Standards and Specifications
C68700 aluminum brass complies with various international standards, including but not limited to:
ASTM B111:
Copper and Copper Alloy Seamless Condenser Tubes and Nozzles.
BS 2871:
Copper and copper alloy tubes.
JIS H3300:
Copper and copper alloy seamless tubes and pipes.
DIN 1785:
Copper and copper alloy rolled tubes for condensers and heat exchangers.
Product Specifications
|
Parameter |
Details |
|
Common Names |
Aluminum Brass, ARS Brass |
|
UNS Number |
C68700 |
|
Available Forms |
Sheet, Strip, Tube (Seamless/Welded), Rod, Wire |
|
Applicable Standards |
ASTM B111, ASTM B171, ASTM B395, ASTM B543 |
Chemical Composition
|
Element |
Content (%) |
Function |
|
Copper (Cu) |
76.0 - 79.0 |
Base metal, provides corrosion resistance |
|
Aluminum (Al) |
1.8 - 2.5 |
Key element - forms protective oxide film |
|
Arsenic (As) |
0.02 - 0.06 |
Critical trace element - prevents dezincification |
|
Zinc (Zn) |
Balance |
Enhances strength and machinability |
|
Other Elements |
≤ 0.15 |
Tightly controlled |
Mechanical Properties
|
Condition |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
Hardness (HRB) |
|
O61 (Annealed) |
415 |
125 |
45 |
65 |
|
H55 (Drawn Hard) |
565 |
485 |
15 |
82 |
|
H58 (Hard) |
620 |
550 |
10 |
88 |
Physical Properties
|
Property |
Value |
|
Density |
8.33 g/cm³ |
|
Electrical Conductivity |
23% IACS |
|
Thermal Conductivity |
58 W/m·K |
|
Thermal Expansion Coefficient |
20.3 × 10⁻⁶/°C |
|
Melting Range |
1040 - 1065°C |
Applications
C68700 aluminum brass is widely used in the following areas:
- Condenser tubes: Due to their excellent thermal conductivity and corrosion resistance.
- Evaporator tubes: Suitable for desalination plants.
- Heat exchanger tubes: Due to their high strength and resistance to seawater corrosion.
- Ships and coastal thermal power plants: Used as condenser tubes and other corrosion-resistant parts.
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