ASME SB111 C71500 CuNi 70/30 Seamless Tube with High Resistance to Seawater Corrosion and Solution Annealed Finish for Heat Exchanger Applications
ASME SB111 C71500 CuNi 70/30 Seamless Tube Heat Exchanger Tubing Anti-Corrosion Pipe
1.Product Description
Copper-nickel alloy tubes are engineering-grade tubing based on copper with nickel as the primary alloying element (content 5%~30%). The most widely used grades are C70600 (90-10, ~10% Ni) and C71500 (70-30, ~30% Ni), with small but critical additions of iron and manganese for micro-alloying strengthening. Manufactured via extrusion combined with cold-drawing or cold-rolling processes, these tubes offer high dimensional precision and smooth internal/external surfaces. The microstructure is a stable single-phase face-centered cubic solid solution, free from phase embrittlement over a broad temperature range. Available in seamless (ASTM B466) and longitudinally welded (ASTM B467) forms, both are suitable for pressurized fluid service.
2.Product Applications
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Marine & Offshore Engineering: Central coolers, plate heat exchanger bundles, ballast water treatment systems, and stern tube cooling lines on ships.
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Power & Energy: Steam turbine condensers, auxiliary coolers, and fin-tube base pipes in thermal and nuclear power plants.
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Desalination & Chemical Processing: Heating section tube bundles in MSF plants, evaporator tubes in MED units, and brine-resistant piping in salt and alkali industries.
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Oil & Gas Offshore: Platform firewater ring mains, riser anti-corrosion sheathing, and subsea pipeline anode connection tubes.
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General Industrial Fluids: Pipelines for high-purity water, organic solvents, and mild acidic media, as well as pneumatic brake tubing for vehicles.
3.Product Advantages
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Superior erosion-corrosion resistance: At seawater flow velocities up to 3–5 m/s, the surface protective film remains stable, with impingement resistance far exceeding that of ordinary brass and stainless steel.
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Natural biofouling resistance & low maintenance: Continuous controlled release of copper ions effectively inhibits algae and barnacle attachment, drastically reducing system downtime for cleaning.
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Well-balanced mechanical properties: Tensile strength ranges from 275 to 345 MPa, with elongation ≥25%, offering excellent strength-toughness matching, and hardness levels can be adjusted via cold working.
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Reliable joining & forming: Compatible with oxy-acetylene welding, TIG welding, brazing, and soldering. Minimum bending radius can reach 1.5D without cracking, and tube ends support flaring and beading.
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Outstanding life-cycle economy: In seawater systems with a 25-year design life, corrosion allowance is significantly lower than carbon steel, and the material is 100% recyclable.
4.Key Product Specifications
| Category | Parameter | C70600 (90-10) | C71500 (70-30) |
| Chemical Composition | Nickel (Ni) content | 9.0 ~ 11.0% | 29.0 ~ 33.0% |
| Iron (Fe) content | 1.0 ~ 1.8% | 0.4 ~ 1.0% | |
| Manganese (Mn) content | ≤1.0% | ≤1.0% | |
| Lead (Pb) content | ≤0.05% | ≤0.05% | |
| Mechanical Properties | Tensile Strength Rm (annealed) | ≥275 MPa | ≥345 MPa |
| Yield Strength Rp0.2 (annealed) | ≥105 MPa | ≥140 MPa | |
| Elongation (annealed, gauge 50mm) | ≥25% | ≥30% | |
| Vickers Hardness HV (annealed) | ≈130 | ≈150 | |
| Physical Properties | Density (20℃) | 8.90 g/cm³ | 8.94 g/cm³ |
| Thermal Conductivity (20℃) | ~50 W/(m·K) | ~29 W/(m·K) | |
| Melting Range | 1100~1150℃ | ~1171℃ | |
| Electrical Resistivity (20℃) | 19 µΩ·cm | 37.4 µΩ·cm | |
| Mean Coef. of Thermal Expansion (20~300℃) | 17.0×10⁻⁶ /K | 16.2×10⁻⁶ /K | |
| Dimensions & Tolerances | Outside Diameter (OD) Range | Φ6mm ~ Φ325mm | Same |
| Wall Thickness (WT) Range | 1.0mm ~ 30.0mm | Same | |
| Single Piece Fixed Length | Up to 16,000mm | Same | |
| OD Tolerance (Precision Cold-Drawn) | ±0.05mm ~ ±0.15mm | Same | |
| Engineering Design References | Recommended Max Seawater Velocity | 3.0 ~ 4.5 m/s | 3.5 ~ 5.0 m/s |
| Average Grain Size (ASTM E112) | 0.035 ~ 0.050 mm | 0.030 ~ 0.045 mm | |
| Applicable Standards | Seamless / Welded Pipe Specs | ASTM B466 / ASTM B467 | Same |
| Heat Exchanger Tube Specs | ASTM B111 / ASME SB-111 | Same | |
| German / Chinese Standards | DIN 86019 / GB/T 8890 (B10, B30) | Same |
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