c71500 copper nickel
GNEE are leading suppliers and stockholders of Copper Nickel 70/30 (CN107), a premium alloy renowned for exceptional corrosion resistance, marine-grade durability, and high performance in seawater and chemical environments.
Copper Nickel (CuNi) is a copper-based alloy containing nickel, iron, and manganese. It is widely used in industries where seawater corrosion, biofouling, thermal conductivity, and long-term structural integrity are key considerations.
The supplier holds an extensive range of ultrasonically tested CuNi bar stock with full 3.2 mill certification and compliance with DEF STAN 02-879 for use in defence and aerospace applications.
c71500 grade designation
| Grade | EN Designation | CW Number | UNS | BS |
|---|---|---|---|---|
| CN107 (70/30) | CuNi30Mn1Fe | CW354H | C71500 | CN 107 |
c71500 applications
Copper Nickel 70/30 is used in:
Marine & Offshore Engineering – seawater piping, condensers, pump housings
Defence & Naval Systems – MOD-grade piping systems (DEF STAN 02-879 compliant)
Aerospace Engineering – hydraulic tubing, anti-corrosive components
Desalination & Water Treatment – evaporators, brine heaters, condensers
Heat Exchange & HVAC – oil coolers, air conditioners, finned tubes
Automotive Systems – brake lines, fuel and hydraulic systems
Hygiene & Healthcare – antimicrobial surfaces
c71500 material characteristics
Higher nickel content (~30%) for enhanced strength and corrosion resistance
Excellent performance in high-velocity seawater and polluted marine environments
Superior erosion and cavitation resistance
Used in high-pressure heat exchangers, power stations, and naval systems
Excellent for aerospace, subsea, and critical defence infrastructure
Compliant with EN 12163, DEF STAN 02-879, and UNS C71500
Typical Composition:
Cu: Balance
Ni: ~30%
Mn: ~1%
Fe: ~0.5–1%
c71500 vs c70600 – quick comparison
For high-velocity or polluted seawater, C71500 (70/30) offers superior erosion and cavitation resistance due to higher nickel content (~30% vs ~10%). For cost-sensitive projects with clean seawater at lower velocities, C70600 (90/10) is sufficient.
c71500 physical properties
| Property | Value |
|---|---|
| c71500 density | 8.9 g/cm³ |
| Specific heat (20°C) | 377 J/kg·K |
| Thermal conductivity | 46 W/(m·K) |
| Coefficient of thermal expansion (20-100°C) | 17 × 10⁻⁶ /K |
| Modulus of elasticity | 130 GPa |
| Electrical resistance (20°C annealed) | 19 μOhm·cm |
c71500 fabrication properties
| Property | Rating |
|---|---|
| Machinability | Less suitable (~20%) |
| Cold forming | Excellent |
| Warm forming | Good |
| WIG welding | Excellent |
| MIG welding | Excellent |
| Hard soldering | Excellent |
| Soft soldering | Excellent |
| Resistance welding | Excellent |
c71500 heat treatment
| Treatment | Temperature |
|---|---|
| Melting point | 1130 – 1160°C |
| Hot working | 950 – 1050°C |
| Soft annealing | 680 – 750°C |
| Thermal stress relieving | 400 – 450°C |
c71500 mechanical properties
| Condition | Annealed R290 | R310 | R480 |
|---|---|---|---|
| Tensile strength (MPa) | ≥ 290 | ≥ 310 | ≥ 480 |
| Yield strength (MPa) | ≥ 90 | ≥ 220 | ≥ 400 |
| Elongation A5 (%) | ≥ 30 | ≥ 12 | ≥ 8 |
| Vickers hardness | 75–105 | 105–150 | ≥ 150 |
c71500 corrosion resistance
C71500 offers superior corrosion and erosion resistance compared to 90/10, due to higher nickel content (~30%). Excellent resistance to:
Biofouling and microbial-induced corrosion (MIC)
Stress corrosion and intergranular attack
Pitting and crevice corrosion
FAQ
Q1: C71500 vs C70600 – which one for high-velocity seawater?
C71500 is better for high-velocity and polluted seawater. C71500 contains ~30% nickel while C70600 contains only 9-11% nickel. This higher nickel content gives C71500 superior erosion and cavitation resistance. For naval systems, high-pressure heat exchangers, and power stations, choose C71500.
Q2: What is the density of C71500 material?
C71500 density is 8.9 g/cm³. For round bar weight calculation: cross-sectional area × length × 8.9 = weight in grams. For pipe: (OD - wall) × wall × 0.028 = kg per meter.
Q3: What is the machinability of 70/30 copper nickel?
Machinability is less suitable at approximately 20% of free-cutting brass. Cold forming and welding are excellent alternatives. For complex components, consider ordering finished machined parts rather than machining from bar stock.
Q4: What welding methods work for C71500?
WIG welding (TIG), MIG welding, hard soldering, soft soldering, and resistance welding are all rated Excellent. For seawater piping systems, TIG welding with ERNi-7 filler metal and argon back-purge is recommended.
Q5: What is the tensile strength of annealed C71500?
Annealed C71500 (R290 condition) has minimum tensile strength of 290 MPa. Higher strength conditions include R310 (≥310 MPa) and R480 (≥480 MPa). Yield strength ranges from 90 MPa (annealed) to 400 MPa (R480).
Q6: What is the hot working temperature for C71500?
Hot working temperature range is 950 – 1050°C. Soft annealing is 680 – 750°C. Thermal stress relieving is 400 – 450°C.
Q7: What Defence Standard does C71500 meet?
C71500 is compliant with DEF STAN 02-879 for defence and aerospace applications. The supplier holds ultrasonically tested bar stock with full 3.2 mill certification. For MOD-grade piping systems, specify DEF STAN 02-879 compliance.
