Grade 706 Zirconium (Zr-2.5Nb)

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Grade 706 Zirconium (Zr-2.5Nb)
Categories:	Metal; Nonferrous Metal; Zirconium Alloy
Material Notes:	Characteristics: Comparison to Grade 705: lower oxygen content, greater elongation and lower tensile strength High corrosion resistance to super-heated water, yet lower than the Zircaloys Forms a stable, dense, self-healing oxide layer Highly anisotropic Applications: Pressure tubes in heavy water reactors Machining Parameters: Use slow speeds, heavy feeds and flood cooling with a water-soluble oil lubricant.
Key Words:	UNS R60706, Zircadyne® 706
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Physical Properties	Original Value	Comments

Density	6.44 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	>= 510 MPa
Tensile Strength, Yield	>= 345 MPa @Strain 0.2 %
Elongation at Break	20 %	in 50 mm
Modulus of Elasticity	97.9 GPa
Poissons Ratio	0.33
Shear Modulus	34.5 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000550 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	6.30 µm/m-°C @Temperature 25.0 °C
Specific Heat Capacity	0.285 J/g-°C
Thermal Conductivity	17.1 W/m-K
Melting Point	1840 °C
Boiling Point	4380 °C

Component Elements Properties	Original Value	Comments
Fe + Cr	0.20 %
Hafnium, Hf	<= 4.5 %
Niobium, Nb (Columbium, Cb)	2.5 %
Oxygen, O	0.16 %
Zirconium, Zr	>= 95.5 %	includes Hf

Descriptive Properties
Alpha plus Beta Phase Crystal Structure	hcp + bcc	954°C
Beta Phase Crystal Structure	bcc	> 854°C

References for this datasheet.

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MZRI30 / 14573

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