CuNi 70/30 Copper Nickel Bar Non-Magnetic Weldable ASTM B151 C71500
CuNi 70/30 Copper Nickel Bar Non-Magnetic Weldable ASTM B151 C71500
1.Product Description
Copper nickel bar is a solid rod material based on copper with nickel as the primary alloying element. Classified by nickel content, common grades include CuNi8 (~8% Ni), CuNi10 (~10% Ni), CuNi14 (~14% Ni), CuNi19 (~19% Ni), CuNi23 (~23% Ni), CuNi30 (~30% Ni), CuNi44 (~44% Ni), as well as ASTM grades C70600 (90/10 cupronickel) and C71500 (70/30 cupronickel). Manufactured from high-purity electrolytic copper and electrolytic nickel through vacuum melting, hot forging, multi-pass cold drawing, precision straightening and surface polishing, the bars offer tight dimensional tolerances and a smooth, defect-free surface. Applicable standards include ASTM B151/B151M, EN 12163, GB/T 4423, and ISO 9725.
2.Product Applications
Copper nickel bars are widely used across various industries due to their excellent comprehensive performance:
| Application Field | Typical Components |
| Marine & Offshore Engineering | Seawater cooling pipelines, valve stems, heat exchanger tube sheets, propeller shaft sleeves, submarine cable sheaths, offshore platform fasteners, marine pump shafts |
| Petrochemical Industry | Acid-resistant pump shafts, reactor agitators, evaporator heating tubes, tank inner lining strips, pipe flanges, corrosive media transfer fittings |
| Electric Power & Electrical | Resistance elements for high-voltage circuit breakers, shunts, transformer winding cores, thermocouple protection tubes, generator brush holders |
| Automotive & Precision Machinery | Hydraulic brake hard tubes, pneumatic connectors, precision gear blanks, plain bearing bushes, sensor housings, precision shafts for instruments |
| Cryogenic & LNG | LNG transfer line fittings, cryogenic valve components, air separation unit pressure conduits |
3.Product Advantages
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Excellent corrosion resistance:Performs exceptionally well in seawater, chlorides, dilute sulfuric acid, alkalis and other corrosive media, with extremely low pitting and crevice corrosion tendency, and outstanding resistance to stress corrosion cracking.
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High strength-toughness combination:Tensile strength ranges 380–620 MPa, elongation generally 25%–40%, combining high strength with excellent plasticity, good impact and fatigue resistance.
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Erosion and cavitation resistance:Low corrosion rate in high-velocity seawater (≥5 m/s) and sand-containing media, with outstanding cavitation peeling resistance, suitable for pumps, valves, and pipelines under dynamic loading.
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Excellent workability:Smooth machinability for turning, milling, drilling and tapping; good adaptability for hot bending and welding (TIG, resistance welding, brazing) without special process requirements.
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Wide temperature stability:From -250°C cryogenic to +350°C high temperature, mechanical properties change gradually with no ductile-to-brittle transition, and good high-temperature oxidation resistance.
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Long service life:Service life of 25–30 years in marine and chemical environments, with extremely low life-cycle maintenance costs.
4.Product Specifications
| Parameter | CuNi8 | CuNi10 | CuNi14 | CuNi19 | CuNi23 | CuNi30 | CuNi44 | C70600 | C71500 |
| Chemical Composition | |||||||||
| Nickel Content Ni (%) | ~8 | ~10 | ~14 | ~19 | ~23 | ~30 | ~44 | ≥29 | 29~33 |
| Copper Content Cu (%) | Balance | Balance | Balance | Balance | Balance | Balance | Balance | ≥55 | ≥65 |
| Iron Content Fe (%) ≤ | — | — | — | — | — | — | — | 0.3 | 1.0 |
| Manganese Content Mn (%) ≤ | 0.5 | 0.5 | — | — | — | — | — | 0.3 | 1.0 |
| Physical Properties | |||||||||
| Density (g/cm³) | 8.85 | 8.87 | 8.90 | 8.90 | 8.91 | 8.93 | 8.95 | 8.90 | 8.94 |
| Melting Point (°C) | 1150~1220 | 1100~1200 | 1100~1180 | — | — | 1080~1150 | — | ~1220 | ~1240 |
| Conductivity (%IACS) | — | — | — | 20~22 | — | — | — | ~30 | ~10 |
| Thermal Conductivity (W/m·K) | 80 | 75 | 70 | 38 | — | 35 | — | — | 29.1 |
| Resistivity (μΩ·m) | 0.22 | 0.24 | 0.28 | 0.33 | — | 0.45 | — | 0.32 | 0.50 |
| Elastic Modulus (GPa) | — | — | — | — | — | — | — | 140 | 150 |
| Coefficient of Expansion (×10⁻⁶/°C) | — | — | — | — | — | — | — | 16.2 | 15.0 |
| Mechanical Properties | |||||||||
| Tensile Strength (MPa) | ≥420 | ≥450 | 430~520 | 380~480 | — | ≥460 | — | ≥510 | 380~620 |
| Yield Strength (MPa) | ≥250 | ≥275 | 170~260 | 200~250 | — | ≥300 | — | ≥260 | ≥180 |
| Elongation (%) | ≥25 | 20~35 | 20~40 | 35~40 | — | ≥25 | — | ≥30 | ~30 |
| Service Temperature Range (°C) | -200~+300 | -200~+300 | -200~+320 | -200~+330 | — | -200~+350 | — | -200~+300 | -200~+350 |
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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