Zirconium 702
UNS R06702
Stock program: Available on request
Specification: ASTM B 523 / ASME SB 523
Maximum service temperature: 550°C / 1020°F
Zirconium 702 is a commercially pure zirconium, well known for its immunity to stress corrosion cracking and its resistance to pitting and crevice corrosion. Zirconium is a reactive metal that has a high affinity for oxygen resulting in the formation of a protective oxide layer at room temperature. A heat treating process enhanced this oxide layer, which serves as an excellent bouncing surface against a variety of corrosions in certain aggressive environments. The zirconium is used in applications where even the best stainless steels and nickel alloys are not sufficiently corrosion resistant.
Characteristics
- Excellent corrosion resistance to organic and mineral acids
- Good ductility even at cryogenic temperatures
- Very good resistance to corrosion in strong alkalis
- High strength capability
- Low thermal conductivity
Market applications:
- Chemical engineering
- (Nuclear) power plants
- Cooling system parts
- Heat exchanges
- Automotive components
Technical details
| Technical composition (%) | N | C | O | H | Zr | Hf | Fe + Cr | |
|---|---|---|---|---|---|---|---|---|
| Zirconium 702 | min | - | - | 0.16 | - | 99.2 | - | - |
| max | 0.026 | 0.060 | - | 0.006 | - | 4.6 | 0.2 |
| Mechanical properties | Zirconium 702 |
|---|---|
| Tensile strenght (mpa, min) | 380 - 620 |
| Yield strength (0.2% offset mpa, min) | 180 - 250 |
| Elongation (%, min) | 18 |
| Density / weight (g / cm3 / kg) | 6.5 |