GNEE can provide the form
Products Description
GNEE is a leading global exporter of heat exchanger tubes with over 18 years of experience and a global presence in over 80 countries. We are proud to introduce our C68700 copper alloy seamless tubes. Our tubes meet ASTM B111 standards and are SGS certified, ensuring the highest quality and reliability.
Designed for demanding heat exchanger applications, these tubes offer superior corrosion resistance, high thermal conductivity, and exceptional durability. GNEE specializes in precision manufacturing, and its copper alloy tubes are trusted by industries worldwide.
Common Grades of Copper Alloy Heat Exchanger Tubes
| Grade | UNS Number | Composition | Applications |
|---|---|---|---|
| Admiralty Brass | C44300 | Copper, Zinc, Tin | Marine condensers, power plants |
| Aluminum Brass | C68700 | Copper, Aluminum, Zinc | Heat exchangers in seawater environments |
| 90/10 Cu-Ni | C70600 | 90% Copper, 10% Nickel | Desalination plants, shipbuilding |
| 70/30 Cu-Ni | C71500 | 70% Copper, 30% Nickel | High-pressure condensers, offshore platforms |
Delivery Conditions for Copper Tubes
| Condition | Description |
|---|---|
| Hard Drawn (H) | Maximum strength and hardness, suitable for high-pressure applications. |
| Annealed (O) | Softened for improved ductility and ease of bending. |
| Half Hard (HH) | A balance between strength and flexibility. |
| As Manufactured (As-Made) | Standard properties without additional treatments. |
ASTM B111 Testing and Quality Standards
Our copper alloy tubes are manufactured in strict compliance with ASTM B111 standards, ensuring the highest level of quality and reliability. Key testing and quality requirements include:
Chemical Composition Analysis:
Ensures the correct ratio of copper, aluminum, and zinc for C68700 grade.
Verified using spectrometers for absolute precision.
Mechanical Properties Testing:
Tensile strength, yield strength, and elongation are tested to ensure compliance with ASTM standards.
Typical mechanical properties for C68700:
Tensile Strength: 310–500 MPa
Yield Strength: ≥105 MPa
Elongation: ≥30%
Hydrostatic and Eddy Current Testing:
All tubes undergo hydrostatic tests to ensure no leaks under pressure.
Eddy current testing detects surface and subsurface defects.
Dimensional Inspection:
Outer diameter, wall thickness, and length are measured with tight tolerances to guarantee precision.
Surface Quality:
Tubes are free from defects such as cracks, dents, or deformities, ensuring flawless performance.
Applications of C68700 Copper Alloy Tubes
Thanks to their excellent corrosion resistance, high thermal conductivity, and mechanical strength, C68700 Copper Alloy Tubes are widely used in various industries, including:
Heat Exchangers:
Used in power plants, chemical processing, and petrochemical industries for efficient heat transfer.
Condensers and Evaporators:
Ideal for marine and industrial use, especially in environments with seawater exposure.
Desalination Plants:
Commonly used in desalination systems due to their resistance to seawater corrosion.
Oil and Gas Industry:
Suitable for offshore platforms and refineries where harsh environments demand reliable materials.
HVAC Systems:
Widely applied in heating, ventilation, and air conditioning systems for efficient thermal exchange.
Shipbuilding:
Used in marine condensers, coolers, and piping systems due to superior resistance to biofouling.
Products provided by GNEE
| Product Category | Standard & Material | Available Forms | Thickness / Diameter Range | Width / OD Range | Length / Form | Temper / State | Surface Finish |
|---|---|---|---|---|---|---|---|
| Copper Sheet & Plate | ASTM B152, B187 Pure Copper (C11000) Phosphor Bronze, Brass |
• Coil • Sheet • Plate |
Sheet: 0.3 mm - 10.0 mm Plate: 10.0 mm - 100 mm |
100 mm - 2500 mm | Coil: Custom Sheet/Plate: 1000mm - 6000mm or Custom |
• O (Soft Annealed) • H02 (Half-Hard) • H04 (Hard) • H08 (Full-Hard) |
• Mill (Bare) • Clad • Brushed • Coated |
| Copper Rod & Bar | ASTM B133, B187 Pure Copper, Tellurium Copper Brass, Bronze |
• Round Rod • Square Bar • Hexagonal Bar • Flat Bar |
Rod Dia.: 2.0 mm - 300 mm Flat Bar Thk.: 3 mm - 50 mm |
Flat Bar Width: 10 mm - 400 mm | Straight: 1000mm - 6000mm Coil (for small dia.) |
• Annealed (Soft) • Half-Hard • Hard • As Drawn |
• Drawn (Smooth) • Turned (Peeled) • Ground (Polished) |
| Copper Wire | ASTM B1, B3 Bare Copper, Tinned Copper |
• Bare Wire • Tinned Wire • Stranded Wire • Braided Wire |
Solid Wire: 0.05 mm - 10.0 mm Stranded: Custom (e.g., 7/0.2mm) |
- | Coil, Spool, Reel Weight: Custom (e.g., 5kg, 25kg) |
• Soft (Annealed) • Hard Drawn • Medium-Hard |
• Bright Bare • Electrotinned • Oxidized-Resistant |
| Copper Tube & Pipe | ASTM B75, B88 Seamless, Welded DHP Copper (C12200) |
• Straight Tube • Coiled Tube • Capillary Tube • Square Tube |
OD: 3 mm - 300 mm Wall Thk.: 0.5 mm - 10.0 mm |
- | Straight: 1000mm - 8000mm Coil: Custom Length |
• Annealed (Soft, Bendable) • Hard Drawn (Straight) |
• Bare (Clean) • Polished • Plastic Capped |
| Copper Foil | ASTM B370 Rolled Annealed (RA) Electrodeposited (ED) |
• Roll / Coil • Strip |
Thickness: 0.01 mm - 0.50 mm (10 µm - 500 µm) |
10 mm - 1300 mm | Coil: Custom Length | • As Rolled (Hard) • Annealed (Soft, Ductile) • Laminated |
• Standard (One Side Bright) • Double Side Bright • Treated (for PCB) |
