UNS C71500 Copper Nickel Alloy Pipe, Tube, Plate, Sheet, Bar

Copper Nickel C71500 is also known as 70/30 Alloy because it contains 70% copper, 30% nickel alloy with additions of Fe and Mn which make it resistant to corrosion and erosion. C71500 has higher nickel content than that of C70600, making it have better corrosion resistance for marine application, which assures a long and reliable service life for parts in these conditions.

Higher nickel content than C70600 – 30% nickel provides better corrosion resistance for marine applications

Iron and manganese additions – Make the alloy resistant to both corrosion and erosion

Long and reliable service life – Assured for parts operating in marine conditions

Suitable for demanding environments – High temperatures and pressures combined with high velocity and turbulence

C71500 Copper Nickel Alloy is typically used in areas where high temperatures and pressures are combined with high velocity and turbulence.

Chemical processing applications:

Condensers and boiler parts

Heat exchanger components

Process equipment and refrigerators

Propeller sleeves and ferrules

Heat exchanger tubes, evaporator tubes, distiller tubes

Condenser plates

Flexible metal hose

Pump impellers

Welding backing rings

Valve bodies and fittings

Marine applications:

Salt water flanges

Salt water piping

Pump bodies and internal parts for sea water

Sea water condensers

Salt water pipe fittings

Water boxes

Q1: C71500 vs C70600 – which one has better corrosion resistance for marine use?

C71500 has better corrosion resistance for marine applications. The page states that C71500 has higher nickel content than C70600, which gives it better corrosion resistance and assures a long and reliable service life for parts operating in marine conditions. For salt water piping, condensers, and pump components, C71500 is the preferred choice.

Q2: What is the tensile strength of C71500?

C71500 tensile strength ranges from 45 to 52 ksi depending on form and temper. Yield strength at 0.2% offset is 18 ksi. Elongation is 27% with hardness ranging from 80 to 120 HB. These mechanical properties make C71500 suitable for high pressure applications in chemical processing and marine environments.

Q3: What forms and specifications are available for C71500?

C71500 is available as sheet, plate, strip, seamless pipe, seamless tube, welded pipe, welded tube, round bar, flat bar, and wire. Seamless pipe and tube conform to ASTM B466 and ASTM B111. Sheet and plate conform to ASTM B171, ASTM B122, and ASTM B432. Round and flat bar conform to ASTM B122 and B151. Wire conforms to AMS 4725 and ASTM B197.

Q4: What is the density of C71500?

C71500 density is 0.303 lb/in³ according to this specification. Note that this differs from the typical 0.323 lb/in³ found in other sources. For weight calculations, verify the correct density with your supplier. The density affects tube and pipe weight calculations for shipping and installation planning.

Q5: What is the melting temperature of C71500?

C71500 melting temperature range is 2140 to 2265°F. This relatively high melting point allows the alloy to maintain strength at elevated temperatures. The wide range indicates the alloy does not melt at a single temperature but over a range as different phases liquefy.

Q6: What are the chemical composition requirements for C71500?

C71500 requires nickel plus cobalt content of 29-33%, iron content of 0.4-1.0%, and copper as balance. Maximum limits are zinc 1.0%, lead 0.05%, and manganese 1.0%. The iron and manganese additions are what make the alloy resistant to both corrosion and erosion in marine environments.

Q7: What is C71500 used for in chemical processing?

C71500 is used for condensers, boiler parts, heat exchanger components, process equipment, refrigerators, propeller sleeves, ferrules, heat exchanger tubes, evaporator tubes, distiller tubes, condenser plates, flexible metal hose, pump impellers, welding backing rings, and valve bodies and fittings. These applications typically involve high temperatures and pressures combined with high velocity and turbulence.

Q8: What are the marine applications of C71500?

C71500 marine applications include salt water flanges, salt water piping, pump bodies and internal parts for sea water, sea water condensers, salt water pipe fittings, and water boxes. The alloy's higher nickel content gives it better corrosion resistance for these marine applications, assuring a long and reliable service life.

Q9: What thermal properties does C71500 have?

C71500 thermal conductivity is 56 btu/(ft·hr·°F) with electrical conductivity of 4.6% IACS at 68°F. These thermal properties make C71500 suitable for heat exchanger and condenser applications where heat transfer is required. For applications requiring higher thermal conductivity, consider C70600 or C12200.

Q10: What hardness range does C71500 typically have?

C71500 hardness typically ranges from 80 to 120 HB (Brinell hardness). Tensile strength ranges from 45 to 52 ksi with elongation of 27%. These properties indicate a moderately strong material that still maintains ductility for forming and fabrication operations.

Chemical verification: Every batch of C71500 is tested to ensure composition meets requirements: Ni+Co 29-33%, Fe 0.4-1.0%, Zn 1.0% max, Pb 0.05 max, Mn 1.0% max, Cu balance.

Mechanical testing: Tensile, yield, elongation, and hardness tests confirm properties meet specification requirements.

Dimensional inspection: Tubes, pipes, plates, sheets, bars, and wire are checked against applicable ASTM standards.

Traceability: All materials are traceable to heat numbers with test reports available.

Bundling: C71500 copper pipes are formed into hexagonal bundles with steel straps applied every 1.5 meters. Plywood separators are placed between each layer to prevent surface scratching.

End protection: Plastic caps are fitted on both ends of each pipe to keep debris out and protect threads or beveled ends.

Bundle weight limit: Each bundle is kept under 2000 kg (4400 lbs) for safe handling.

Cut length packaging: When pipes are cut to shorter lengths, they are packed into ISPM-15 certified wooden crates with foam lining inside.

Coiled pipe packaging: Long-length coiled pipe is wound onto steel reels. The reel flange is marked with heat number, size, and total length.

Labels on every bundle: Alloy (C71500 70/30), heat number, OD × wall thickness, length, quantity, PO number, net weight, and gross weight are clearly marked.

Sea freight protection: Desiccant bags are placed inside a moisture-barrier plastic liner for shipments to tropical destinations or when storage exceeds 6 months.

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