CuNi12Zn24 Nickel Silver

(Note: CuNi12Zn24 is a nickel silver alloy, not pure copper. The specifications are standardized as nickel silver.)

Grade Designation & Standards

Standard Grade: CuNi12Zn24 (Nickel Silver)

International Equivalents:

• China: C75720 (GB/T 5231-2012)

• Europe: 2.0730 (DIN 17663-1983)

• USA: C75700 (ASTM B122)

Product Features

1. High Strength & Corrosion Resistance: Tensile strength ≥400 MPa, yield strength ~200 MPa, resists seawater, weak acids, and high-temperature oxidation (corrosion rate ≤0.003 mm/a).

2. Excellent Machinability: Supports cold rolling, welding, and casting; surface finish up to Ra 0.1μm for complex component forming.

3. Balanced Conductivity & Wear Resistance: Moderate electrical conductivity with superior wear resistance, ideal for high-load applications.

4. Temperature Adaptability: Stable performance across a wide range (-100°C to 300°C).

Common Product Forms & Dimensions

Product Form	Size Range	Delivery Condition
Sheet	Thickness: 0.05-1.5mm, Width ≤500mm	Soft (M), Hard (H)
Rod	Diameter: 3-120mm, Length: 2-6m	Drawn, Hot-Rolled
Tube	OD: 2-150mm, Wall Thickness: 0.3-15mm	Cold-Drawn, Half-Hard
Wire	Diameter: 0.05-6.0mm	Coiled or Straight
Strip	Thickness: 0.1-3.0mm	Custom Cut

Chemical Composition

Element	Content (%)	Function/Limit
Cu	63.0-66.0	Base material, core properties
Ni	11.0-13.0	Enhances corrosion resistance & strength
Zn	Balance (28-32%)	Adjusts plasticity, reduces cost
Pb	≤0.03	Strictly controlled to avoid brittleness
Fe	≤0.3	Trace impurities
Others	≤0.2	Ensures material purity

Physical Properties 

Property	Value	Remarks
Density	8.8-8.9 g/cm³	High density for precision parts
Electrical Conductivity	~15% IACS	Moderate conductivity for industrial use
Thermal Conductivity	50-60 W/(m·K)	Moderate heat dissipation
Thermal Expansion	17.2×10⁻⁶/°C (20-200°C)	Excellent thermal stability
Melting Point	990-1025°C	Limited castability

Mechanical Properties

Property	Soft (M)	Hard (H04)
Tensile Strength (σb)	400-550 MPa	600-800 MPa
Elongation (δ10)	15%-25%	2%-5%
Vickers Hardness (HV)	120-180	200-300
Elastic Modulus	≥105 GPa	Critical for high-load applications

Core Advantages

1. Balanced Performance: Combines high strength, corrosion resistance, and wear resistance for extreme environments.

2. Multi-Form Adaptability: Available in sheets, tubes, wires, and custom forms.

3. Longevity: Fatigue resistance exceeds 1 million cycles, reducing maintenance costs.

Product Applications

1. Marine Engineering: Ship propellers, seawater valves, offshore platform components.

2. Chemical Equipment: Corrosion-resistant pipes, pump bodies, reactor linings.

3. Electrical Engineering: Connectors, high-load switch contacts.

4. Automotive: Engine wear parts, braking system components.

Processing Guidelines

1. Welding: Prefer TIG or laser welding to minimize porosity.

2. Annealing: Post-cold working, anneal at 650-750°C to relieve stress.

3. Machining: Cutting speed ≤50 m/min; use carbide tools with oil-based coolant.

4. Cost Optimization: Optimize processes to offset high nickel content costs.

Key Application Scenarios

• Marine Environments: Seawater desalination equipment, ship valves.

• High-Temperature & High-Pressure Systems: Petrochemical valves, nuclear reactor seals.

• Precision Machinery: Aerospace components, medical device wear parts.

FAQs

Q: How does CuNi12Zn24 differ from brass?

A: CuNi12Zn24 is a Cu-Ni-Zn alloy with superior corrosion resistance and strength but higher cost.

Q: Is it suitable for welding?

A: Yes, but use low-heat-input methods (e.g., laser welding) to prevent zinc evaporation.

Q: Performance in cryogenic environments?

A: Stable at -100°C, suitable for polar equipment.

Standard References

• Chemical Composition: DIN 17663-1983, GB/T 5231-2012.

• Mechanical Testing: EN 12163, ASTM B122.

• Processing: ISO 426-2, Aerospace Standard AMS 4590.

Note: Data consolidated from industrial standards and technical documents. Actual parameters may vary slightly due to manufacturing processes. Refer to supplier test reports for precise specifications.