C71500 Copper

Grade Designation & Standards

Standard Grade: C71500 (70-30 Cu-Ni Alloy, CuNi70/30)

International Equivalents:

• UNS: C71500 (ASTM B111M, B122)

• EN: CW354H (DIN 17663)

Applicable Standards: ASTM B111M, B122, B151M, B466M

Product Features

1. High Corrosion Resistance: Excellent performance in seawater, weak acids, and high-temperature oxidation (corrosion rate ≤0.003 mm/a).

2. Mechanical Excellence: Tensile strength 350-550 MPa, elongation 20-40%, combining toughness and plasticity.

3. Machinability: Supports cold/hot working, welding (TIG/MIG), and deep drawing; surface finish up to Ra 0.1μm.

4. Temperature Adaptability: Design temperature up to 371°C (annealed state), no brittleness at cryogenic conditions.

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

Chemical Composition

Element	Content (%)	Function/Limit
Cu	65.0-70.0	Base material
Ni	29.0-33.0	Enhances corrosion resistance & strength
Fe	0.4-1.0	Improves wear & fatigue resistance
Mn	≤1.0	Enhances machinability
Pb	≤0.05	Strictly controlled
Zn	≤1.0	Impurity limitation

C71500 Copper Nickel Properties

Physical Properties

Property	Value	Remarks
Density	8.94 g/cm³	High density for precision parts
Melting Point	1170-1240°C	Limited castability
Thermal Conductivity	29-33 W/(m·K)	Moderate heat dissipation
Thermal Expansion	13.2-16.2×10⁻⁶/°C (20-300°C)	Excellent thermal stability
Electrical Conductivity	5-7% IACS	Suitable for industrial use

Mechanical Properties

Property	Soft (M)	Hard (H04)
Tensile Strength (σb)	350-480 MPa	550-800 MPa
Yield Strength (σ0.2)	105-205 MPa	250-450 MPa
Elongation (δ10)	20-40%	2-5%
Hardness (HV)	80-130	200-300

Core Advantages

1. Industry-Leading Corrosion Resistance: Outstanding resistance to pitting and stress corrosion cracking in seawater and chemical media.

2. Multi-Scenario Adaptability: Operates reliably from -100°C to 371°C.

3. High Machining Flexibility: Compatible with welding, cold stamping, and forging.

Product Applications

1. Marine Engineering: Seawater cooler pipes, ship propellers, offshore platform components.

2. Chemical Equipment: Distillation towers, reactors, heat exchanger sleeves.

3. Power Industry: Nuclear plant condensers, heat exchangers.

4. Aerospace: Engine components, hydraulic system pipelines.

Processing Guidelines

1. Welding: Prefer TIG or laser welding to minimize heat-affected zone brittleness.

2. Annealing: Post-cold working, anneal at 650-750°C; hot working temperature range: 900-1050°C.

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

Key Application Scenarios

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

• Precision Instruments: Aircraft engine parts, deep-sea exploration equipment.

FAQs

1. Q: How does C71500 differ from brass?

A: C71500 offers superior corrosion resistance and strength but at a higher cost.

2. Q: Is C71500 material welding feasible?

A: Yes, but control heat input and use compatible filler wires.

3. Q: Corrosion resistance in acidic environments?

A: Resists weak acids but avoid strong oxidizing acids (e.g., nitric acid).

Standard References

• Chemical Composition: ASTM B111M, DIN 17663.

• Mechanical Testing: ASTM B122, EN 12163.

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

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