Copper Nickel 70/30 Products | C71500 CuNi

C71500 Copper Nickel, also referred to as CuNi 70/30, offers excellent corrosion resistance, especially in marine saltwater environments. Among the most sought-after 70/30 Copper Nickel properties is its ability to withstand aggressive seawater conditions over prolonged periods. The main wrought 70/30 Copper Nickel Alloy chosen for seawater service contains 30 percent nickel, with important additions of iron and manganese that are necessary to maintain good corrosion resistance.

This C71500 material is widely used in the form of 70/30 Copper Nickel Pipes, 70/30 Copper Nickel Plates, valves, and pump components, making it a preferred choice across marine, offshore, and industrial applications. Compliant with SB 111 C71500 standards, this alloy is trusted globally for its durability and performance.

Welded Pipes: Engineered to deliver exceptional resistance to seawater corrosion, erosion, and biofouling in demanding marine environments. Used in offshore platforms, shipbuilding, and desalination systems.

Plates & Sheets: Offer outstanding formability, weldability, and superior corrosion resistance in aggressive saltwater and industrial environments. Ideal for heat exchangers, ship hulls, and marine structural components.

Tubes: Precision-manufactured to withstand continuous exposure to high-temperature and high-pressure seawater applications. Commonly specified for condenser systems, evaporator tubes, and heat exchanger assemblies.

Flanges: Manufactured to SB 111 C71500 standards, providing a secure and corrosion-resistant connection in critical marine and offshore piping systems.

Rods & Bars: Offer excellent machinability, high tensile strength, and outstanding resistance to corrosion. Used for marine hardware, pump shafts, propeller sleeves, and precision industrial components.

Industrial:
Pump Impellers, Heat Exchanger Tubes, Evaporator Tubes, Distiller Tubes, Condenser Plates, Refrigerators, Process Equipment, Condenser Components, Ferrules, Welding Backing Rings, Flexible Metal Hose, Weld Wire, Boiler Parts, Condensers, Propeller Sleeves, Heat Exchanger Components

Marine:
Salt Water Flanges, Salt Water Piping, Valve Bodies, Sea Water Service, Fittings, Sea Water Condensers, Salt Water Pipe Fittings, Water Boxes – Salt Water Applications, Pump Bodies and Internal Parts – Sea Water

Q1: What is 70/30 Copper Nickel?

C71500 Copper Nickel, also known as 70/30 Copper Nickel Alloy, is comprised of 30% nickel. This CuNi 70/30 alloy finds its greatest application in areas of high temperatures and pressures combined with high velocity and destructive turbulence. It is a preferred material across marine, offshore, and industrial environments.

Q2: What is the machinability of Copper Nickel 70/30?

The machinability rating of C71500 is 20%. This relatively low rating is typical of 70/30 Copper Nickel alloys due to their toughness and work-hardening characteristics. Proper tooling and machining parameters are required for precise fabrication.

Q3: What is the density of C71500?

C71500 density is 0.323 lb/in³ at 68°F (8.94 g/cm³). For pipe weight calculation: (OD - wall) × wall × 10.68 = lb per foot. This high density contributes to the alloy's pressure tightness and durability.

Q4: What is the difference between O60 Annealed and H80 Hard Drawn C71500 pipe?

O60 Annealed has 52 KSI tensile strength, 18 KSI yield, and 51 HRB max hardness. H80 Hard Drawn has 70 KSI tensile, 45 KSI yield, and 70 HRB min hardness. O60 is fully annealed – best for bending and tube expansion. H80 is hard drawn – suitable for straight pipe runs requiring higher strength.

Q5: What product forms are available in C71500?

Pipes (seamless and welded), tubes, plates, sheets, flanges, round bars/rods, fittings (elbow, tee), and wire. Size ranges vary by product form. Contact supplier for specific dimensions.

Q6: What is C71500 used for in marine applications?

Salt water flanges, salt water piping, valve bodies, seawater service fittings, seawater condensers, salt water pipe fittings, water boxes, pump bodies and internal parts for seawater. The alloy's excellent corrosion resistance in marine environments makes it ideal for these applications.

Q7: What is C71500 used for in industrial applications?

Pump impellers, heat exchanger tubes, evaporator tubes, distiller tubes, condenser plates, refrigerators, process equipment, boiler parts, condensers, propeller sleeves, and welding backing rings. The alloy's durability and corrosion resistance make it suitable for these demanding industrial applications.

Q8: What ASTM standards cover C71500 pipe and tube?

ASTM B466 covers seamless pipe. ASTM B467 covers welded pipe. ASTM B111 covers tube. ASTM B122 covers plate and sheet. ASTM B151 covers rod and bar. ASME B16.22 covers fittings. ASME B16.5 covers flanges.

Q9: What is the melting point of C71500?

Liquidus is 2260°F, solidus is 2140°F. Modulus of elasticity in tension is 22,000 ksi. Modulus of rigidity is 8,300 ksi. These properties allow the alloy to maintain strength at elevated temperatures.

Q10: What is the thermal conductivity of C71500?

Thermal conductivity is 17.0 Btu·ft/(hr·ft²·°F) at 68°F. Coefficient of thermal expansion is 9.0 × 10⁻⁶ per °F (68-572°F). Specific heat capacity is 0.09 Btu/lb/°F at 68°F.

Chemical verification: Per composition requirements: Ni 29-33%, Fe 0.40-1.0%, Mn 1.0% max, Pb 0.05% max, Zn 1.0% max, Cu remainder.

Mechanical testing: Tensile and hardness tested per temper: O60 Annealed (52 KSI tensile, 18 KSI yield, 51 HRB max), H80 Hard Drawn (70 KSI tensile, 45 KSI yield, 70 HRB min).

Dimensional inspection: OD, wall thickness, length checked per ASTM B466 / B111 / B467 tolerances.

Hydrostatic testing: Per ASTM specification.

Eddy current testing: When specified, per ASTM E243.

Certification: EN 10204 3.1 Certificate available. Third party inspection available.

Traceability: Test reports linked to heat numbers.

Bundling: Pipes are formed into bundles with steel straps. Plywood separators between layers prevent surface scratching.

End protection: Plastic caps on both ends.

Labels: Alloy (C71500 / 70/30), heat number, OD × wall thickness, length, quantity, PO number, net weight, gross weight.

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