CuNi18Zn27 Copper

Designation

• Name: High-Nickel Zinc Cupronickel CuNi18Zn27

• International Designation: CW410J (European Standard), DIN 2.0540, C77000

• Standards: DIN 17665, EN 12164, ISO 1635.

Key Features

1. Superior Corrosion Resistance: Excellent resistance to seawater, salt spray, and strong acids.

2. High Strength & Ductility: Balanced tensile strength (up to 600MPa) and cold-forming capability.

3. Anti-Biofouling: Smooth surface minimizes marine organism adhesion.

4. Conductivity: Ideal for precision electronics and thermal management.

5. Aesthetic Value: Silver-white luster for luxury applications.

Common Forms & Dimensions

Form	Dimensions
Round Bar	Diameter: Φ5.0mm–350mm
Plate	Thickness: 0.5–150mm
Tube	Seamless tubes per EN 12449 (Wall ≤20mm)
Wire	Diameter: 0.2mm–6.0mm
Forged Parts	Custom shapes (e.g., marine fittings, valves)
Note: Confirm feasibility for non-standard sizes.

Chemical Composition (wt%)

Element	Cu	Ni	Zn	Pb	Fe	Mn	Impurities
Range	53–58	17–19	25–28	≤0.3	≤0.5	≤0.5	≤0.5
Data based on DIN 17665.

Physical Properties

Property	Value/Description
Density	8.9 g/cm³
Thermal Conductivity	25 W/m·K (at 20°C)
Electrical Resistivity	0.35 μΩ·m (at 20°C)
Conductivity	~12% IACS
Magnetism	Slightly magnetic (Ni influence)

Mechanical Properties

Property	Range/Typical Value
Tensile Strength (Rm)	450–650 MPa (varies by temper)
Yield Strength (Rp0.2)	200–400 MPa
Elongation (A)	15–35%
Brinell Hardness (HB)	120–200
Note: Hard temper (H) offers higher tensile strength.

Core Advantages

• Extreme Environment Adaptability: Suitable for deep-sea and harsh chemical environments.

• Versatile Processing: Compatible with cold rolling, stamping, welding, and casting.

• Low Maintenance: Anti-fouling and wear-resistant properties extend service life.

Applications

• Marine Engineering: Deep-sea valves, condensers, pump components.

• Energy & Chemical: Acid-resistant pipelines, refinery heat exchangers.

• Electronics: High-precision connectors, resistor substrates.

• Luxury Goods: Watch cases, jewelry accessories.

Processing Guidelines

1. Cold Working: Limit deformation to ≤30% per pass; anneal at 700–800°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 rhodium 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 bands.

FAQs

Q1: How does CuNi18Zn27 differ from CuNi12Zn24?

A: CuNi18Zn27 has higher Ni content (17–19%) for enhanced corrosion resistance and strength.

Q2: Suitable for high-temperature/pressure environments?

A: Long-term use ≤180°C; short-term tolerance up to 250°C (pressure-dependent).

Q3: How to prevent cracking during processing?

A: Control cold deformation rate and anneal promptly.

Standards Reference

• DIN 17665: Chemical and mechanical specifications.

• EN 12164: Plate and strip processing standards.

• ISO 1635: Corrosion resistance testing.