GNEE can provide the form
Core Advantages
1. Marine Corrosion Benchmark: Dezincification depth <0.1 mm/year (ASTM G48 seawater), service life >15 years.
2. Heat Exchange Efficiency: Condenser tube heat transfer coefficient ≥5200 W/m²·K, 30% better than stainless steel.
3. Forming Adaptability: Cold bending radius ≥2× wall thickness; compatible with Ag/Cu-P brazing.
4. Environmental Safety: As ≤0.06%, complies with EU REACH industrial exemption.
Product Applications
Marine Engineering: Ship condenser tubes, desalination pipelines, subsea valves.
Energy & Power: Thermal power plant condensers, nuclear cooling systems, refinery heat exchangers.
HVAC: AC refrigerant tubes, chlorinated hot water pipes.
Mechanical Parts: Deep-drawn pins/springs, corrosion-resistant bearing bushings.
Processing Guidelines
|
Process |
Key Parameters |
Risk Control |
|
Hot Working |
700–800°C (finish >550°C) |
Control O₂ at 0.5–1.5% to prevent Zn volatilization |
|
Welding |
TIG: 80–120A |
Argon purity ≥99.99% + preheat 150°C (prevents As porosity) |
|
Annealing |
Stress relief: 285°C×1h |
N₂ atmosphere anti-oxidation |
|
Cold Working |
Deformation ≤50% |
Intermediate annealing at 650°C |
|
Surface Treatment |
Pickling (HNO₃-H₂SO₄) |
Tin plating after oxide removal |
Key Application Scenarios
Mega Vessels: 200k DWT ship condenser tube bundles (seamless, wall 1.5mm).
Nuclear Plants: AP1000 coolant pipes (chloride resistance design).
Coastal Power Stations: Seawater cooling valves (forged + Ni-Cr coated).
Premium HVAC: Central AC evaporator tubes (brazing integrity required).
FAQ
Q1: Can it replace lead-free alloys in potable water systems?
A: Restricted! Arsenic leaching risk. Use C68700 aluminum brass instead; compliant for industrial cooling water.
Q2: How to resolve welding porosity?
A: Caused by As/Zn volatilization. Use ≥99.99% argon, preheat 150–200°C, post-weld stress relieve at 260°C×1h.
Q3: Causes and prevention of hot cracking?
A: Zn loss weakens grain boundaries. Control slightly oxidizing atmosphere (O₂: 0.5–1.5%), limit heating time ≤2h.
Q4: How to select vs. C68700?
A: C44300 offers superior seawater resistance & 15% lower cost; C68700 is arsenic-free for civilian use.
Products provided by GNEE
| Product Category | UNS Numbers | Typical Sizes | Thickness/Diameter | Available Forms | Surface Treatment |
|---|---|---|---|---|---|
| Pure Copper | C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10900, C11000, C11100, C11300, C11400, C11500, C11600, C12000, C12200 | 1000-6000mm (length) | 0.1-200mm | Sheet, Plate, Strip, Foil | Mill finish, Polished, Bright annealed, Oiled, Brush finished |
| Brass Alloys | C21000, C22000, C23000, C24000, C26000, C26800, C27000, C27200, C28000, C33000, C33200, C33500, C34000, C34500, C35000, C35300, C35600, C36000, C36500, C37000, C37700, C38500 | 500-4000mm (length) | 0.05-150mm | Rod, Bar, Wire, Tube | Polished, Chrome plated, Lacquered, Satin finish |
| Bronze Alloys | C51000, C52100, C52400, C53400, C54400, C63000, C63200, C64200, C65100, C65500, C65700, C67300 | 1000-3000mm (length) | 0.2-100mm | Bar, Rod, Plate, Strip | Polished, Oxidized, Oiled, Ground |
| Copper-Nickel | C70400, C70600, C71000, C71500, C72200 | 2000-6000mm (length) | 0.5-250mm | Tube, Plate, Sheet | Pickled, Passivated, Polished |
| Phosphor Bronze | C50100, C50500, C50700, C51000, C51100, C51900, C52100, C52400 | 500-2000mm (length) | 0.05-50mm | Strip, Wire, Sheet | Polished, Tin plated, Natural |
