Zirconium 702 is a commercially pure Zirconium. Zirconium is a reactive metal that has a high affinity for oxygen resulting inthe formation of a protective oxide layer in air at room temperature. This protective oxide gives Zirconium alloys their superior corrosion resistance. This oxide layer can be enhanced through a heat treating process. A properly formed enhanced oxide layer serves as an excellent bearing surface against a variety of materials, imparts impressive erosion resistance in high velocity systems and can improve the corrosion restance in certain aggressive environments.
Zirconium alloys exhibit good ductility even at cryogenic temperatures and good strength comparable with
other common engineering alloys.
Chemical Composition,%
|
Zr 702 |
Zr 704 |
Zr 705 |
Zircaloy-2 |
Zircaloy-4 |
|
|
Sn |
/ |
1~2% |
1~2% |
1.2~1.7% |
1.2~1.7% |
|
Fe |
<0.05% |
0.1~0.2% |
<0.05% |
0.07~0.2% |
0.07~0.2% |
|
Cr |
<0.05% |
0.1~0.2% |
<0.01% |
0.05~0.15% |
0.05~0.15% |
|
Ni |
/ |
/ |
/ |
0.03~0.08% |
<0.007% |
|
Hf |
1~2.5% |
<4.5% |
<4.5% |
<200ppm for Nuclear industry |
<200ppm for Nuclear industry |
|
Nb |
/ |
/ |
2~3% |
||
|
Zr Hf |
~99.5% |
~97.5% |
~95.5% |
~98% |
~98%
|
Physical Constants and Thermal Properties
|
Density |
g/cm3 |
6.51 |
|
Melting range |
°C |
1852 |
|
Thermal conductivity |
W/(m°K) |
22.7 |
|
Specific heat |
J/kg•°C |
275 |
|
Electrical resistivity |
ohm -cm |
397e-005 |
|
Modulus of elasticity |
GPa |
99.2 |
|
Poisson ratio |
0.35 |
|
|
Coefficient of expansion |
5.89 x 106
|
Typical Mechanical Properties(Annealed)
|
Material |
State |
Rm(≥)/MPa |
Rp0.2(Pa |
A50mm(≥)/% |
|
Zirconium 702 (UNS R60702) |
annealed |
379 |
207 |
16 |
|
Zirconium 704 (UNS R60704) |
annealed |
413 |
241 |
14 |
|
Zirconium 705 (UNS R60705) |
annealed |
552 |
379 |
16
|
• Used to make high temperature superconductive materials.
• Used to make electrodes components, foils, flanges bolts, tubes and rods for special applications.
• Used for applications in medical equipment, such as zirconium implants.
• Used as raw material for reactors and crucibles.
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