CuNi12Zn24 Copper

Designation

• Name: Nickel-Zinc Cupronickel CuNi12Zn24

• International Designation: CW409J (European Standard), DIN 2.0520, C75700

• Standards: DIN 17664, EN 12163, ISO 1187.

Key Features

1. Corrosion Resistance: Excellent in seawater, chloride, and acidic environments.

2. High Strength & Ductility: Balanced mechanical properties for cold forming.

3. Anti-Biofouling: Smooth surface resists marine organism attachment.

4. Conductivity: Suitable for precision electronics and thermal components.

5. Aesthetic Appeal: Silver-white finish for decorative applications.

Common Forms & Dimensions

Form	Dimensions
Round Bar	Diameter: Φ5.0mm–300mm
Plate	Thickness: 0.5–150mm
Tube	Seamless tubes per EN 12449 (Wall ≤15mm)
Wire	Diameter: 0.2mm–5.0mm
Forged Parts	Custom shapes (e.g., flanges, valve parts)
Note: Confirm feasibility for non-standard sizes.

Chemical Composition (wt%)

Element	Cu	Ni	Zn	Pb	Fe	Mn	Impurities
Range	60–65	11–13	23–25	≤0.5	≤0.3	≤0.5	≤0.5
Data based on DIN 17664.

Physical Properties

Property	Value/Description
Density	8.8 g/cm³
Thermal Conductivity	29 W/m·K (at 20°C)
Electrical Resistivity	0.28 μΩ·m (at 20°C)
Conductivity	~15% IACS
Magnetism	Slightly magnetic (due to Ni)

Mechanical Properties

Property	Range/Typical Value
Tensile Strength (Rm)	380–520 MPa (varies by temper)
Yield Strength (Rp0.2)	160–300 MPa
Elongation (A)	20–40%
Brinell Hardness (HB)	100–160
Note: Significant differences between soft (O) and hard (H) tempers.

Core Advantages

• All-Round Corrosion Resistance: Adaptable to harsh environments.

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

• Long Service Life: Low maintenance with anti-fouling properties.

Applications

• Marine Engineering: Desalination pipes, ship valves, condenser tubes.

• Chemical Industry: Heat exchangers, reactor linings, acid transfer pipes.

• Electronics: Precision connectors, resistor substrates.

• Decoration: High-end cutlery, architectural trim.

Processing Guidelines

1. Cold Working: Anneal at 650–750°C to relieve stress.

2. Welding: Use TIG welding; post-weld acid cleaning required.

3. Machining: Low-speed cutting with lubricants.

4. Surface Treatment: Polishing/coating for enhanced durability.

Key Application Scenarios

• Desalination Plants: Corrosion-resistant piping.

• Petrochemical Refineries: Acid-resistant components.

• Luxury Appliances: Functional and decorative metal parts.

FAQs

Q1: How does CuNi12Zn24 differ from B10 cupronickel?

A: B10 has 10% Ni and lower corrosion resistance; CuNi12Zn24 offers optimized Ni-Zn balance.

Q2: Suitable for high-temperature steam?

A: Recommended ≤150°C for long-term use; short-term tolerance up to 200°C.

Q3: How to avoid cracking during processing?

A: Control cold deformation rate and anneal promptly.

Standards Reference

• DIN 17664: Chemical and mechanical specifications.

• EN 12163: Rod processing standards.

• ISO 1187: Corrosion resistance testing.