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Code

Copper

C7150 Copper

Grade Designation & Standards

Standard Grade: C7150 (B10 Copper-Nickel Alloy)

International Equivalents:

UNS (USA): C71500

EN (Europe): CW354H

JIS (Japan): C7150

Applicable Standards:

ASTM B122 (Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar)

EN 12449 (Copper and Copper Alloys – Seamless Round Tubes)

GB/T 5231-2012 (Wrought Copper Alloys)

Key Features

1. Exceptional Corrosion Resistance: Performs reliably in seawater, salt spray, and acidic environments (corrosion rate ≤0.01 mm/a)

2. High Mechanical Strength: Balanced tensile strength and ductility after heat treatment.

3. Thermal Stability: Maintains performance in high-temperature applications (up to 400°C).

4. Ease of Fabrication: Supports cold/hot working, welding, and machining.

5. Anti-Biofouling Properties: Ideal for marine applications due to resistance to microbial adhesion.

Common Product Forms & Specifications

Product Form	Size Range	Delivery Condition
Rod	Diameter: 5–150 mm; Length: 1–6 m	Annealed, Cold-drawn
Sheet/Strip	Thickness: 0.5–12 mm; Width ≤1200 mm	Soft (O), Hard (H)
Tube	OD: 10–200 mm; Wall Thickness: 1–15 mm	Annealed, Half-hard
Wire	Diameter: 0.5–10 mm	Coiled or Straight
Custom Profiles	As per technical drawings	Tailored processing states

Chemical Composition

Element	Cu	Ni	Fe	Mn	Impurities
Content	62.0–71.0%	29.0–33.0%	0.4–0.6%	≤1.0%	≤0.5%

Typical impurities include Pb ≤0.02%, Si ≤0.5%, C ≤0.05% .

Physical Properties

Property	Value	Remarks
Density	8.94 g/cm³	High density for structural stability
Melting Point	1000–1020°C	Suitable for high-temperature brazing
Electrical Conductivity	~5% IACS	Low conductivity, typical for Cu-Ni alloys
Thermal Conductivity	29–40 W/(m·K)	Moderate heat dissipation
Thermal Expansion Coefficient	16.5×10⁻⁶/°C (20–200°C)	Stable dimensional performance

Mechanical Properties

Property	Annealed (Soft)	Cold-Worked (Hard)
Tensile Strength (Rm)	380–500 MPa	550–700 MPa
Yield Strength (Rp0.2)	130–240 MPa	450–550 MPa
Elongation (A50)	30–40%	3–8%
Hardness (HV)	70–80	160–220

Core Advantages

1. Marine Durability: Resists pitting and crevice corrosion in seawater, outperforming standard stainless steel .

2. Heat Treatment Flexibility: Optimized strength via annealing (600–700°C) or cold working.

3. Low Maintenance: Long service life in harsh environments reduces replacement costs.

Product Applications

Marine Engineering: Ship hulls, seawater piping, heat exchangers .
Chemical Processing: Reactors, condensers, acid-handling equipment.
Power Generation: Desalination plants, offshore wind turbine components.
Oil & Gas: Subsea valves, drilling equipment.

Processing Guidelines

1. Annealing: Heat to 600–700°C for 1–2 hours, followed by air cooling to relieve stress.

2. Welding: Use TIG or MIG welding with matching filler metals (e.g., ERCuNi).

3. Machining: Employ carbide tools with sulfur-based coolants; cutting speed ≤60 m/min.

4. Surface Treatment: Passivate with nitric acid solutions or apply protective coatings (e.g., epoxy).

Key Application Scenarios

Seawater Cooling Systems: Tubing and heat exchangers in ships and coastal plants.
Offshore Platforms: Pump shafts and valve components exposed to saltwater.
Chemical Reactors: Liners and agitators for corrosive media.

FAQs

Q1: How does C7150 compare to C70600 (90/10 Cu-Ni)?

A1: C7150 (70/30 Cu-Ni) offers higher strength and better corrosion resistance but is costlier.

Q2: Can C7150 be used in high-temperature steam environments?

A2: Yes, it withstands temperatures up to 400°C but requires stress relief annealing above 300°C.

Q3: How to prevent cracking during cold forming?

A3: Limit deformation to ≤20% per pass and anneal between stages .

Standard References

Chemical Composition: ASTM B122, EN 12449 .
Mechanical Testing: ISO 6892-1 (Metallic Materials – Tensile Testing).
Processing: ASTM B543 (Standard for Copper-Nickel Alloy Seamless Condenser Tubes).

Note: Data consolidated from industrial standards and material testing reports. Actual properties may vary slightly depending on manufacturing processes. For precise specifications, consult supplier certifications.

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