Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASTM B111 C44300 (UNS C44300) is a lead-free aluminum brass alloy specifically engineered for marine and industrial applications requiring exceptional resistance to dezincification, erosion, and biofouling. These seamless tubes are ideal for condensers, heat exchangers, and desalination systems operating in seawater or brackish environments.
Key Features:
| Element | Min (%) | Max (%) | Role in Alloy |
|---|---|---|---|
| Copper (Cu) | 70.0 | 73.0 | Base metal for corrosion resistance |
| Zinc (Zn) | 26.7 | 29.3 | Enhances strength and workability |
| Arsenic (As) | 0.02 | 0.10 | Prevents dezincification in seawater |
| Aluminum (Al) | - | 0.02 | Improves oxide layer adhesion |
| Iron (Fe) | - | 0.06 | Controlled impurity |
| Lead (Pb) | - | 0.07 | Maintains machinability |
| Standard | Grade | Region/Application |
|---|---|---|
| UNS | C44300 | Global marine systems |
| EN | CW702R | European heat exchangers |
| DIN | 2.0460 | German shipbuilding |
| JIS | C6870 | Japanese condensers |
| GB | HAl77-2 | Chinese industrial standards |
| Property | Annealed Condition | Hard Temper | Test Method |
|---|---|---|---|
| Tensile Strength (MPa) | 340 - 410 | 440 - 520 | ASTM E8/E8M |
| Yield Strength (MPa) | ≥125 | ≥275 | ASTM E8/E8M |
| Elongation (%) | ≥45 | ≥15 | ASTM E8/E8M |
| Hardness (Rockwell B) | 65 - 75 | 80 - 90 | ASTM E18 |
| Thermal Conductivity (W/m·K) | 116 | 105 | ASTM E1225 |
| Industry | Typical Uses | Performance Advantage |
|---|---|---|
| Marine Engineering | Shipboard condensers, desalination plant heat exchangers | Resists biofouling and saltwater pitting (0.05 mm/year corrosion rate) |
| Power Generation | Steam turbine cooling systems, nuclear plant tubing | Withstands high-velocity seawater (up to 3 m/s) |
| Oil & Gas | Offshore platform cooling loops, LNG heat exchangers | Compatible with chlorinated fluids (up to 5 ppm Cl⁻) |
| Chemical Processing | Acidic fluid transfer systems, evaporators | Stable in pH 6-8.5 environments |
