Designation
Name: Nickel-Zinc Cupronickel CuNi18Zn20
International Designation: CW411J (European Standard), DIN 2.0530, C76900
Standards: DIN 17666, EN 12165, ISO 1636.
Key Features
1. Superior Corrosion Resistance: Excellent resistance to seawater, salt spray, and weak acids.
2. High Strength & Ductility: Balanced tensile strength (500–700 MPa) with cold/hot forming capability.
3. Anti-Biofouling: Smooth surface minimizes marine organism adhesion.
4. Conductivity: Ideal for precision electronics and thermal management.
5. Aesthetic & Wear Resistance: Silver-white luster for luxury and wear-resistant parts.
Common Forms & Dimensions
Form | Dimensions |
Round Bar | Diameter: Φ5.0mm–300mm |
Plate | Thickness: 0.5–120mm |
Tube | Seamless tubes per EN 12449 (Wall ≤18mm) |
Wire | Diameter: 0.3mm–5.0mm |
Forged Parts | Custom shapes (e.g., marine fittings, flanges) |
Note: Confirm feasibility for non-standard sizes. |
Chemical Composition (wt%)
Element | Cu | Ni | Zn | Pb | Fe | Mn | Impurities |
Range | 60–63 | 17–19 | 19–21 | ≤0.3 | ≤0.5 | ≤0.5 | ≤0.5 |
Data based on DIN 17666. |
Physical Properties
Property | Value/Description |
Density | 8.7 g/cm³ |
Thermal Conductivity | 27 W/m·K (at 20°C) |
Electrical Resistivity | 0.32 μΩ·m (at 20°C) |
Conductivity | ~13% IACS |
Magnetism | Slightly magnetic (Ni influence) |
Mechanical Properties
Property | Range/Typical Value |
Tensile Strength (Rm) | 500–700 MPa (varies by temper) |
Yield Strength (Rp0.2) | 220–420 MPa |
Elongation (A) | 18–35% |
Brinell Hardness (HB) | 130–210 |
Note: Hard temper (H) offers higher tensile strength. |
Core Advantages
All-Environment Resistance: Suitable for marine, chemical, and freshwater corrosion.
Versatile Processing: Compatible with cold rolling, stamping, welding, and casting.
Long Service Life: Low maintenance with anti-fouling and wear resistance.
Applications
Marine Engineering: Seawater pumps, ship condensers, deep-sea pipelines.
Energy & Chemical: Acid-resistant pipelines, heat exchanger linings.
Electronics: High-precision connectors, resistor substrates.
Luxury Goods: Cutlery, architectural trim, watch cases.
Processing Guidelines
1. Cold Working: Limit deformation to ≤25% per pass; anneal at 680–750°C.
2. Welding: Use TIG welding; post-weld passivation required.
3. Machining: Carbide tools with low speed and lubricants.
4. Surface Treatment: Electro-polishing or palladium plating for enhanced finish.
Key Application Scenarios
Deep-Sea Equipment: High-pressure corrosion-resistant valves.
Nuclear Power Plants: Chloride-resistant heat transfer tubes.
Luxury Watchmaking: Sweat-resistant watch cases.
FAQs
Q1: How does CuNi18Zn20 differ from CuNi18Zn27?
A: CuNi18Zn20 has lower Zn content (19–21% vs. 25–28%), offering slightly better corrosion resistance but lower strength.
Q2: Suitable for high-temperature/pressure environments?
A: Long-term use ≤170°C; short-term tolerance up to 230°C (pressure-dependent).
Q3: How to prevent cracking during processing?
A: Control cold deformation rate and anneal promptly.
Standards Reference
DIN 17666: Chemical and mechanical specifications.
EN 12165: Rod and wire processing standards.
ISO 1636: Corrosion resistance testing.
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