CuNi 70/30 Copper Nickel Round Bar Corrosion Resistant Marine Grade UNS C71500 ASTM B151

1.Product Description

Copper nickel bar (also known as cupronickel bar) is a copper-based alloy bar product with nickel as the primary alloying element. Common grades include CuNi8 (~8% Ni), CuNi10 (~10% Ni), CuNi14 (~14% Ni), CuNi19 (~19% Ni), CuNi30 (~30% Ni), as well as C70600 (90/10 copper-nickel) and C71500 (70/30 copper-nickel). The product is manufactured from high-purity electrolytic copper and electrolytic nickel through processes including melting, hot forging/rolling, straightening, and polishing, with strict dimensional tolerances and a smooth, burr-free surface. The bars comply with international and national standards such as ASTM B151/B151M and GB/T.

2.Product Applications

Copper nickel bars are widely used in the following applications:

1. Marine and Offshore Engineering: Seawater piping systems, pump and valve components, propeller shafts, fasteners, desalination plant components, offshore platform structural parts and connectors

2. Heat Exchange and Condensation Equipment: Heat exchangers, condenser tubes, heat exchanger cores, pressure vessels

3. Chemical and Petrochemical Equipment: Reactors, evaporators, pipelines and valves for corrosive media, acid/alkali storage tank linings

4. Power and Electrical: Heating resistance elements in thermal overload relays, low-voltage circuit breakers, and other low-voltage electrical devices

5. Precision Machinery and Automotive: Power steering tubes, brake lines, precision turned components​

​3.Product Advantages

1. Superior Corrosion Resistance: Excellent resistance to corrosion in seawater, salt spray, chlorides, and various chemical media, with effective resistance to pitting, stress corrosion cracking, and biofouling

2. High Strength and Toughness: Tensile and yield strengths significantly higher than pure copper and many low-alloy copper materials, combined with good toughness and impact resistance

3. Excellent Biofouling Resistance: Outstanding resistance to marine biofouling, suitable for long-term seawater immersion

4. Good Workability and Weldability: Easy to turn, drill, tap, and weld, with smooth secondary processing

5. Long Service Life: Stable performance under seawater erosion, chloride corrosion, and long-term stress—no rust, no deformation, no cracking

6. Properties: Excellent antibacterial characteristics, suitable for hygiene-sensitive environments such as medical and food processing facilities

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​4.Product Specifications

Note: The above parameters are typical values; actual values may vary depending on grade, processing condition, and applicable standards. Diameter range is typically 6mm to 300mm, with length customizable upon request.

FAQ

1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.

2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.

4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.