CuNi 70/30 C71500 Round Bar Precision Tolerances ASTM B151

Product Specification

CuNi 70/30 C71500 Round Bar Precision Tolerances 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

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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.

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