Zirconium and Zirconium alloys

Zirconium 702 is a commercially pure Zirconium. Zirconium is a reactive metal that has a high affinity

for oxygen resulting in the 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

Product Forms

Wire
Bar
Sheet
Plate
Tube
Pipe

Major Specifications

ASTM B 523 (Tube)
B 550 (Bar, Wire)
B 551 (Plate, Sheet, Strip)
B 658 (Pipe)
B 653 (Fitting)

Nuclear Application:

ASTM B 350 (Ingots)
B 351 (Bar, Wire)
B 352 (Plate, Sheet, Strip)
UNS R60702
R60704
R60705

Applications

• 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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