Grade 705 Zirconium (Zr-2.5Nb)

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Grade 705 Zirconium (Zr-2.5Nb)
Categories:	Metal; Nonferrous Metal; Zirconium Alloy
Material Notes:	Characteristics: Higher strength than Zircaloys 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 R60705, Zircadyne® 705
Vendors:	Eagle Alloys Corporation is a leading supplier of quality metals and alloys. Our staff prides itself on working fast, efficiently and courteously to get you the information you need. Call (800) 237-9012 or visit www.EagleAlloys.com. Click here to view all available suppliers for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
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Physical Properties	Metric	English	Comments

Density	6.44 g/cc	0.233 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	>= 552 MPa	>= 80100 psi
	260 MPa @Temperature 400 °C	37700 psi @Temperature 752 °F
	300 MPa @Temperature 300 °C	43500 psi @Temperature 572 °F
	370 MPa @Temperature 200 °C	53700 psi @Temperature 392 °F
	480 MPa @Temperature 100 °C	69600 psi @Temperature 212 °F
	600 MPa @Temperature 20.0 °C	87000 psi @Temperature 68.0 °F
Tensile Strength, Yield	150 MPa @Temperature 400 °C	21800 psi @Temperature 752 °F
	190 MPa @Temperature 300 °C	27600 psi @Temperature 572 °F
	270 MPa @Temperature 200 °C	39200 psi @Temperature 392 °F
	370 MPa @Temperature 100 °C	53700 psi @Temperature 212 °F
	500 MPa @Temperature 20.0 °C	72500 psi @Temperature 68.0 °F
	>= 379 MPa @Strain 0.2 %	>= 55000 psi @Strain 0.2 %
Elongation at Break	16 %	16 %	in 50 mm
	20 % @Temperature 20.0 °C	20 % @Temperature 68.0 °F
	27 % @Temperature 400 °C	27 % @Temperature 752 °F
	30 % @Temperature 300 °C	30 % @Temperature 572 °F
	32 % @Temperature 100 °C	32 % @Temperature 212 °F
	34 % @Temperature 200 °C	34 % @Temperature 392 °F
Modulus of Elasticity	97.9 GPa	14200 ksi
Poissons Ratio	0.33	0.33
Shear Modulus	34.5 GPa	5000 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000550 ohm-cm	0.0000550 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	6.30 µm/m-°C @Temperature 25.0 °C	3.50 µin/in-°F @Temperature 77.0 °F
Specific Heat Capacity	0.285 J/g-°C	0.0681 BTU/lb-°F
Thermal Conductivity	17.1 W/m-K	119 BTU-in/hr-ft²-°F
Melting Point	1840 °C	3340 °F
Boiling Point	4380 °C	7920 °F

Component Elements Properties	Metric	English	Comments
Fe + Cr	0.20 %	0.20 %
Hafnium, Hf	<= 4.5 %	<= 4.5 %
Niobium, Nb (Columbium, Cb)	2.5 %	2.5 %
Oxygen, O	0.18 %	0.18 %
Zirconium, Zr	>= 95.5 %	>= 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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MZRI20 / 14572

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