ASTM B111 C71500 Tube – UNS C71500 Copper Nickel 70/30 Tube

ASTM B111 C71500 Tube, designated as UNS C71500, is a premium copper-nickel 70/30 alloy tube developed for severe marine and industrial environments. With approximately 70% copper and 30% nickel, ASTM B111 UNS C71500 tubes provide significantly higher strength and superior resistance to seawater corrosion compared to 90/10 copper-nickel alloys. The addition of controlled iron and manganese further improves resistance to erosion, cavitation, and biofouling. Due to these properties, ASTM B111 C71500 tubes are extensively used in condensers, heat exchangers, offshore platforms, and power generation systems where reliability and long service life are critical.

Exceptional resistance to seawater, polluted water, and marine atmospheres

Higher mechanical strength than CuNi 90/10 alloys

Excellent resistance to erosion-corrosion and cavitation

Good thermal conductivity and heat transfer efficiency

High resistance to biofouling and stress corrosion cracking

Excellent weldability, formability, and long operational life

Outside Diameter: 6 mm to 114.3 mm

Wall Thickness: 0.9 mm to 7 mm

Length: Up to 6 meters, cut lengths available

Form: Straight tubes and U-bend tubes

Seamless Tubes

U-Bend Tubes

Condenser Tubes

Heat Exchanger Tubes

Marine Condensers

Offshore oil and gas platforms

Heat Exchangers

Power Plants

Desalination Units

Shipbuilding

Seawater Cooling Systems

Q1: What is the difference between C71500 and C70600 tube?

C71500 has higher strength and better seawater corrosion resistance than C70600. C71500 contains 29-33% nickel compared to C70600's 9-11% nickel. The addition of controlled iron and manganese in C71500 further improves resistance to erosion, cavitation, and biofouling. For severe marine environments and high-velocity seawater, choose C71500. For general marine service with lower velocity, C70600 is more economical.

Q2: What ASTM standard covers C71500 copper nickel tube?

ASTM B111 covers C71500 seamless condenser and heat exchanger tubes. The page specifies ASTM B111 C71500 Tube. For pipe applications, ASTM B466 applies. For military applications, MIL-T-15005 covers C71500 tube.

Q3: What sizes are available for C71500 tube?

Outside diameter from 6 mm to 114.3 mm, wall thickness from 0.9 mm to 7 mm. Length up to 6 meters with cut lengths available. Forms include straight tubes and U-bend tubes. Contact supplier for non-standard sizes.

Q4: What is the density of C71500 tube for weight calculation?

C71500 density is 8.95 g/cm³. For tube weight calculation: (OD - wall) × wall × 0.028 = kg per meter. For example, a 25.4mm OD × 1.65mm wall tube weighs approximately (25.4 - 1.65) × 1.65 × 0.028 = 1.09 kg per meter.

Q5: What is the tensile strength of C71500 tube?

Minimum tensile strength is 380 MPa with minimum yield strength of 140 MPa. Elongation is minimum 30% with hardness ≤ 100 HRB. These mechanical properties make C71500 suitable for high-pressure applications in power plants and offshore platforms.

Q6: What equivalent grades match C71500?

EN CuNi30Mn1Fe, DIN 2.0882, and ISO CuNi30Mn1Fe are equivalent to UNS C71500. For European projects, specify EN CuNi30Mn1Fe. For German specifications, use DIN 2.0882.

Q7: What are the key features of C71500 tube?

Exceptional resistance to seawater and polluted water, higher strength than 90/10 alloys, excellent erosion-corrosion resistance, good thermal conductivity, high biofouling resistance, and excellent weldability. These features make C71500 suitable for condensers, heat exchangers, offshore platforms, and power generation systems.

Q8: Is C71500 tube available as U-bend tubes?

Yes, C71500 is available as straight tubes and U-bend tubes. U-bend tubes are commonly used in floating head heat exchangers where the tube bundle can be removed for cleaning or replacement. Specify U-bend radius when ordering.

Q9: What is the melting point of C71500?

Melting point is approximately 1170°C (2140°F). Thermal conductivity is approximately 29 W/m·K. Electrical conductivity is approximately 3% IACS. These properties affect heat transfer performance in condenser and heat exchanger applications.

Q10: Where is C71500 tube used in offshore applications?

Marine condensers, offshore oil and gas platforms, heat exchangers, power plants, desalination units, shipbuilding, and seawater cooling systems. The alloy's resistance to seawater corrosion, erosion, cavitation, and biofouling makes it ideal for these demanding marine environments.

Chemical verification: Each batch tested for Ni 29-33%, Fe 0.4-1.0%, Mn 0.5-1.0%, Zn max 0.5%, Pb max 0.02%, Cu balance.

Mechanical testing: Tensile (≥380 MPa), yield (≥140 MPa), elongation (≥30%), and hardness (≤100 HRB) verified.

Hydrostatic testing: Per ASTM B111 requirements.

Eddy current testing: 100% non-destructive testing per ASTM E243.

Dimensional inspection: OD (6-114.3mm), wall (0.9-7mm), and length (up to 6m) checked against ASTM B111.

Traceability: All test reports linked to heat numbers.

Bundling: Tubes formed into hexagonal bundles with steel straps, plywood separators between layers.

End protection: Plastic caps on both ends.

Bundle weight: Maximum 2000 kg per bundle.

Cut length packaging: Shorter lengths packed into wooden crates.

U-bend tubes: Packed in crates with foam padding to prevent damage.

Labels: Alloy (C71500), heat number, OD × wall, length, quantity, PO number, net/gross weight.

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