c71500 copper nickel tubes, composed of 70% copper and 30% nickel, offer the highest corrosion and impingement resistance of any copper-based alloy. Designed for severe marine and industrial environments, this copper nickel 70/30 delivers unmatched durability and long-term performance even under the most aggressive conditions.
Known for their resistance to acidic waters, high-velocity seawater, and stress corrosion, c71500 material tubes are the preferred material in systems where reliability, longevity, and minimal maintenance are essential.
c71500 copper nickel tube applications
Heat exchangers, condensers, and cooling systems in demanding marine or industrial settings
Desalination plants and high-salinity water treatment systems
Marine piping systems for shipboard cooling, bilge, and ballast water
Chemical processing lines exposed to corrosive fluids and high pressure
Offshore oil & gas platforms operating in harsh coastal conditions
Thermal systems with high turbulence or flow-induced stress
Key benefits of copper nickel 70/30 tubes
Maximum corrosion and erosion resistance: withstands aggressive waters, acids, and high-velocity flow better than any other copper alloy.
Exceptional durability under extreme conditions: ideal for high-pressure, high-temperature, and chemically aggressive environments.
Outstanding impingement resistance: prevents wall thinning and wear in turbulent, fast-flowing systems.
Biofouling and scaling resistance: reduces maintenance in long-term seawater exposure.
Efficient thermal conductivity: ensures optimal performance in demanding heat transfer systems.
Industry standard compliance: manufactured to meet ASTM B111 and other global engineering specifications.
c71500 chemical composition and specifications
| UNS no. | C71500 – BSI No. CN107 – ISO name CuNi30Mn1Fe |
| Chemical comp. (%) | Cu rem / Ni 29-33 / Pb 0.05 / Fe 0.40-1 / Zn 1 max |
| ASTM spec. | B111, B359, B395, B466, B467, B543, B552 |
| ASME spec. | SB111, SB395, SB466 |
| Applications | Heat exchangers, condensers, and cooling systems; desalination equipment, and marine piping systems |
| Temper | O61 annealed / HR50 drawn & stress relieved |
c71500 density and mechanical properties
| Property | Metric | English |
|---|---|---|
| Density | 8.94 g/cm³ | 0.323 lb/in³ |
| Tensile strength | 360 – 495 MPa | 52 – 72 ksi |
| Yield strength | 125 – 345 MPa | 18 – 50 ksi |
| CTE, linear (20-300°C / 70-570°F) | 16.2 × 10⁻⁶/°C | 9.0 × 10⁻⁶/°F |
| Specific heat capacity (20°C / 70°F) | 0.09 cal/g-°C | 0.09 BTU/lb-°F |
| Thermal conductivity (20°C / 70°F) | 29 W/m-K | 17 BTU/ft²/ft/h/°F |
| Melting point | 1171 – 1238°C | 2140 – 2260°F |
FAQ
Q1: What is c71500 copper nickel material?
C71500 (CuNi 70/30) is a copper-nickel alloy composed of 70% copper and 30% nickel. It has superior strength and corrosion resistance compared to C70600 (90/10 copper nickel), making it suitable for highly demanding marine and industrial applications.
Q2: C71500 vs C70600 – which one for seawater pipe?
C71500 has higher strength and better impingement resistance than C70600 for high-velocity seawater. C71500 tensile strength is 360-495 MPa vs C70600 at 303-414 MPa. For seawater flow above 3.5 m/s, choose C71500. For lower velocity, C70600 is more economical.
Q3: What is the density of C71500 for pipe weight calculation?
C71500 density is 8.94 g/cm³ (0.323 lb/in³). For weight calculation: (OD - wall) × wall × 10.68 = lb/ft. For 1" OD × 0.065" wall C71500 copper pipe, weight is approximately 0.65 lb/ft.
Q4: What temper options are available for C71500 tube?
O61 annealed and HR50 drawn & stress relieved. O61 annealed is fully soft – best for bending and tube expansion. HR50 is drawn and stress relieved – higher strength for straight pipe runs.
Q5: What ASTM standards cover C71500 tube?
ASTM B111, B359, B395, B466, B467, B543, B552. For ASME code applications, use SB111, SB395, or SB466.
Q6: Why does C71500 require iron content of 0.40-1.0%?
Iron is required for impingement resistance in high-velocity seawater. Without sufficient iron, the protective passive film is less stable and erosion occurs faster. Always verify Fe content on the mill test certificate.
Q7: Is C71500 suitable for desalination plants?
Yes, C71500 is commonly used in desalination plants and high-salinity water treatment systems. The page lists these as key applications. The alloy's resistance to high-velocity seawater and scaling makes it ideal.
Q8: What is the thermal conductivity of 70/30 copper nickel?
Thermal conductivity is 29 W/m-K at 20°C (17 BTU/ft²/ft/h/°F at 70°F). This is lower than pure copper but acceptable for heat exchangers where seawater corrosion resistance is the priority.
Q9: What is the melting point of C71500?
Melting point range is 1171-1238°C (2140-2260°F). Hot working temperature is lower than melting point – refer to standard processing guidelines.
Detection & Quality Control
| Test Method | Purpose | Acceptance Criteria |
|---|---|---|
| Optical Emission Spectrometry | Verify c71500 chemical composition | Ni 29-33%, Fe 0.40-1.0%, Cu balance |
| Tensile Test | Confirm c71500 mechanical properties | UTS 360-495 MPa, Yield 125-345 MPa |
| Flattening Test | Ductility for tube forming | No cracks when flattened |
| Hydrostatic Test | Leak tightness | Per ASTM B111 |
| Dimensional Check | OD, wall, length | Per ASTM B111 tolerances |
Packaging
| Packaging Type | Length Range | Details |
|---|---|---|
| Hexagonal bundles | 12 – 24 ft (3.66 – 7.32 m) | Steel straps every 1.5m, plywood separators between layers, plastic end caps (color-coded for C71500). Max bundle weight 2000 kg. |
| Wooden crates | Cut lengths (1 – 6 m) | ISPM-15 certified, foam-lined for finished components. Stackable up to 2 high. |
| Steel reels | Coiled tube (continuous lengths) | For long-length tube. Reel flange marked with heat number, size, and total length. |
| Individual sleeving | Precision or polished tube | VCI paper or plastic sleeving for surface protection. |
Factory Equipment
| Equipment | Specification | |
|---|---|---|
| Induction melting furnaces | 6 ton capacity, argon stirring | Precise control of c71500 chemical composition – Ni 29-33%, Fe 0.40-1.0% |
| Horizontal continuous caster | 200 mm billet diameter | Produces solid round billet for extrusion |
| Extrusion press | 3500 ton capacity | Pierces billet to produce hollow shell (tube blank) |
| Cold pilger mills | Multiple stands, up to 40 m length | Reduces tube OD and wall thickness with high precision |
| Draw benches | 30 ton and 60 ton capacities | Final sizing, smooth internal surface finish, straightness 0.5 mm/m |
| Annealing furnaces | 650-815°C (1200-1500°F) | Produces O61 annealed temper – restores ductility and corrosion resistance |
| Stress relieving furnaces | Lower temperature range | Produces HR50 drawn & stress relieved temper |
| Straightening machines | 6-roll rotary | Corrects bending from drawing process |
| Eddy current tester | 100% online | Detects pits, slivers, wall variations (per ASTM E243) |
| Hydrostatic tester | Pressure up to 6000 psi | Leak tests each tube |
| Metallurgical lab | OES spectrometer, tensile tester, hardness tester | In-process and final quality verification |
Our Full Product Range
| Product Form | Common Standards | Typical Alloy Grades | Size Range | Typical Applications |
|---|---|---|---|---|
| Copper Pipe & Tube (Seamless) | ASTM B111, B466, ASME SB111, SB466 | C71500, C70600, C12200, C68700, C44300 | Pipe: 1/4" to 12" sch 40/80; Tube: 3/8" to 1" OD | Heat exchangers, condensers, desalination, marine piping |
| Copper Rod & Bar | ASTM B151, SAE J461/J463 | C71500, C70600, C36000, C46400 | 1/2" to 10" diameter | Valve bodies, pump shafts, fasteners |
| Copper Sheet & Plate | ASTM B122, B171 | C71500, C70600, C46400, C68700 | 0.016" to 2" thick | Tube sheets, baffle plates, cladding |
| Copper Strip & Foil | ASTM B122 | C71500 (Cu-Ni 715), C70600 | 0.0005" to 0.010" thick | Flexible metal foil heaters, thin gauge applications |
| Copper Wire | ASTM B624 | C71500, C70600, C18200 | 0.05 mm to 6 mm diameter | Welding filler wire, fasteners, mesh |
| CNC Machined Components | Custom drawing | C71500, C70600, C36000, C63000, C17200 | Custom tolerances (±0.01 mm) | Pump housings, valve components, custom fittings |
