C71000, also known as Copper Nickel 80/20, is a copper-nickel alloy renowned for its excellent corrosion
resistance, particularly in marine environments. This alloy combines high strength with good ductility,
making it suitable for various demanding applications.
Chemical Composition
C71000 is primarily composed of the following elements:
| Element |
Percentage (%) |
| Copper (Cu) |
79.0 - 81.0 |
| Nickel (Ni) |
19.0 - 21.0 |
| Iron (Fe) |
≤ 1.0 |
| Manganese (Mn) |
≤ 1.0 |
| Lead (Pb) |
≤ 0.05 |
Mechanical Properties
C71000 exhibits excellent mechanical properties suitable for demanding applications:
| Property |
Value |
| Tensile Strength |
315 - 520 MPa |
| Yield Strength |
105 - 380 MPa |
| Elongation |
25 - 45% |
| Hardness (Rockwell B) |
70 - 95 |
| Electrical Conductivity |
4 - 9% IACS (International Annealed Copper Standard) |
| Density |
8.94 g/cm³ |
Corresponding Country's Brand
C71000 is recognized under different brands in various countries. Here are some equivalents:
| Country |
Brand Name |
| USA |
Copper Nickel 80/20 |
| UK |
- |
| Germany |
CuNi20 |
| Japan |
C7100 |
| China |
BFe20-1-1 |
Common Questions and Answers
1. What are the primary applications of C71000 in industry?
Answer: C71000 Copper Nickel 80/20 is widely used in marine applications due to its
excellent corrosion resistance and high strength. It is used in seawater piping systems, heat exchangers,
condensers, and other marine components.
2. Is C71000 suitable for use in seawater environments?
Answer: Yes, C71000 is highly suitable for use in seawater environments due to its superior
resistance to corrosion and biofouling. It is commonly used in shipbuilding, offshore platforms, and
desalination plants.
3. How does C71000 compare to C70600 (Copper Nickel 90/10)?
Answer: C71000 (80/20) has a higher copper content and lower nickel content compared to
C70600 (90/10). This gives C71000 slightly lower corrosion resistance but higher strength and hardness. Both
alloys are suitable for marine applications, with C71000 being preferred where higher mechanical properties
are required.
Summary Table
| Aspect |
Details |
| Chemical Composition |
Cu (79.0-81.0%), Ni (19.0-21.0%), Fe (≤ 1.0%), Mn (≤ 1.0%), Pb (≤ 0.05%) |
| Mechanical Properties |
Tensile Strength: 315-520 MPa, Yield Strength: 105-380 MPa, Elongation: 25-45%, Hardness: 70-95
Rockwell B, Electrical Conductivity: 4-9% IACS, Density: 8.94 g/cm³
|
| Country Brands |
USA: Copper Nickel 80/20, Germany: CuNi20, Japan: C7100, China: BFe20-1-1 |
| Applications |
Marine piping systems, heat exchangers, condensers, shipbuilding, offshore platforms |
C71000 Copper Nickel 80/20 is a robust alloy known for its excellent corrosion resistance and high strength,
making it ideal for marine and industrial applications where durability and performance are essential.
