Introduction
Recently, our customers have started buying large quantities of cuni 70/30 pipes and flanges. We have been producing cuni 70/30 fittings for 20 years.
You may need knowledge about cuni70/30. Usually, communicate with customers about cuni70/10 and the problems they may encounter. Compiling this knowledge took me three days, and it’s worth reading.
What Is CuNi70/30
The cuni 70/30, also known as c71500, has a nickel content of 30 to 32 per cent and is more resistant to seawater corrosion. Excellent hardness and corrosion resistance, cuni70/30 is used in seawater and in large quantities in the chemical and nuclear industries.
Chemical Composition
| Grades | Ni% | Fe% | Mn% | C% | Pb% | S% | P% | Zn% | others | Cu% |
| CuNi70/30 | 30-32 | 0.47-0.7 | 0.5-1.0 | ≤0.04 | ≤0.01 | ≤0.01 | ≤0.02 | ≤0.2 | ≤0.3 | rem |
| C71500 | 29-33 | 0.4-1.0 | ≤1.0 | ≤0.05 | ≤0.02 | ≤0.02 | ≤0.02 | ≤0.5 | rem |
Physical Properties
Here are the mechanicals of the cuni 70/30 that I’ve put together according to the standard for your reference.
| Melting Points | 1171°C |
| Elongation A | ≥30 |
| Mode | M(Fully annealed） |
| Density | 8.94 g/cm3 |
| Tensile Strength | ≥365MPa |
Similar Grade
- DIN 17664 2.0882
- BS 2871 CN 107
- MIL-T-16420K ASTMB 466 C 71500
- JIS H 3300 C 7150T
- DIN86019 CuNi30Mn1Fe/CW354H
CuNi 70/30 Key Features
Each national standard has its own cuni 70/30 material grade. Below is my compilation of commonly used cuni 70/30 grades worldwide.
- Resistant to seawater corrosion and strong hardness, you can use it in seawater or high pressure environments.
- The cuni 70/30 material is flexible and can be cold worked into elbow and reducer fittings. It can also be hot machined and forged into your desired flange shape.
- Good thermal conductivity, excellent material you choose to use for heat exchangers.
CuNi70/30 Products
- CuNi70/30 Pipes You can see our cuni 70/30 tubes in stock. The cuni 70/30 tubes are produced by extrusion-drawing technology, and the tubes are supplied in a soft (fully annealed) state.
- CuNi70/30 Flanges， The cuni 70/30 flange comes in a variety of types as you can see.
- CuNi70/30 Pipe Fittings. The cuni 70/30 tee elbows are made from tubing by cold working and are supplied in a fully annealed condition.
Applications
Naval submarines, chemical industry, heat exchangers.
Conclusion
If your project requires a higher corrosion resistance and strength of copper nickel, you can choose cuni 70/30. We manufacture CuNi 70/30 pipes and flanges. If you need these products, please contact us!
