C70600 Copper

Grade Designation & Standards

Standard Grade: C70600 (Cu-Ni Alloy, equivalent to Chinese grade BFe10-1-1)

International Equivalents:

• UNS: C70600 (ASTM B111M, B122)

• EN: CW354H (DIN 17663)

Applicable Standards:

• GB/T 5231-2012 (Wrought Copper Alloys)

• ASTM B111M, B122, B151M, B466M

C70600 Copper Nickel Product Features

1. Exceptional Corrosion Resistance: Resists seawater, weak acids, saline solutions, and high-temperature oxidation (corrosion rate ≤0.003 mm/a); anti-biofouling in marine environments.

2. Mechanical Excellence: Combines high plasticity (soft-state elongation ≥28%) and strength (hard-state tensile strength ≥550 MPa), suitable for high-load applications.

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

4. Temperature Adaptability: Operates reliably from -100°C to 371°C with no low-temperature embrittlement.

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
Fittings (Elbows, Tees)	Size: DN15-DN500	Stamped/Pushed Manufacturing

C70600 Chemical Composition

Element	Content (%)	Function/Limit
Cu	Balance	Base material, provides conductivity and corrosion resistance
Ni	9.0-11.0	Enhances corrosion resistance and strength
Fe	1.0-1.5	Improves fatigue and wear resistance
Mn	0.5-1.0	Enhances machinability
Zn	≤0.3	Impurity limitation
Pb	≤0.02	Strictly controlled to avoid brittleness
Impurities	≤0.7	Ensures material purity

UNS C70600 Material Properties

Physical Properties

Property	Value	Remarks
Density	8.9 g/cm³	High density for precision parts
Electrical Conductivity	9.1% IACS	Moderate conductivity for industrial use
Thermal Conductivity	40 W/(m·K)	Moderate heat dissipation
Thermal Expansion	17.1×10⁻⁶/°C (20-300°C)	Excellent thermal stability
Elastic Modulus	140 GPa	Material rigidity indicator

Mechanical Properties

Property	Soft (M)	Hard (H)
Tensile Strength (σb)	275-370 MPa	480-800 MPa
Yield Strength (σ0.2)	105-205 MPa	250-450 MPa
Elongation (δ10)	20-40%	2-8%
Vickers Hardness (HV)	80-130	150-300
(Values vary slightly depending on product form and state)

Core Advantages

1. Industry-Leading Corrosion Resistance: Resists stress corrosion cracking and high-temperature dezincification, ideal for harsh environments (seawater, chemical media).

2. High Machining Flexibility: Compatible with stamping, welding, and forging for diverse industrial needs.

3. Cost-Efficiency: Lower cost than high-nickel alloys (e.g., C71500) with performance close to BFe30-1-1.

Product Applications

1. Marine Engineering: Seawater desalination evaporator tubes, ship condensers, offshore platform components.

2. Chemical Equipment: Petrochemical coolers, reactors, heat exchanger sleeves.

3. Power Industry: Power plant steam turbine condensers, nuclear cooling systems.

4. Aerospace: Hydraulic system pipelines, engine components.

Processing Guidelines

1. Welding: Prefer TIG or laser welding; interpass temperature ≤100°C to avoid hot cracking.

2. Annealing: Post-cold working, anneal at 650-750°C to relieve stress; hot working temperature: 900-960°C.

3. Environmental Requirements: Welding humidity <90%; preheat to 15°C if ambient temperature is <0°C.

FAQs

1. Q: How does C70600 differ from BFe30-1-1?

A: C70600 has lower Ni content (9-11% vs. 30%), slightly lower strength but higher plasticity, similar corrosion resistance, and lower cost.

2. Q: Is it suitable for strong acid environments?

A: Suitable for weak acids and seawater but avoid strong oxidizing acids (e.g., concentrated nitric acid).

3. Q: Post-weld heat treatment for tubes?

A: Recommend low-temperature annealing (250-300°C) to eliminate residual stress.

Standard References

• Chemical Composition: ASTM B111M, GB/T 5231-2012.

• Mechanical Testing: GB/T 8890-2007, ASTM B122.

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

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.