Zirconium 702

Grade 702 Zirconium, Commercially Pure

Zr content above includes Hf content (4.5% max).

Physical Properties	Metric	English	Comments
Density	6.5 g/cc	0.235 lb/in³
Mechanical Properties
Hardness, Rockwell A	49	49	Estimated from Vickers
Hardness, Rockwell B	78	78	Estimated from Vickers
Hardness, Vickers	150	150	Annealed Sample
Tensile Strength, Ultimate	Min 379 MPa	Min 55000 psi
Tensile Strength, Yield	Min 207 MPa	Min 30000 psi	0.2% YS
Elongation at Break	16 %	16 %	in 50 mm
Modulus of Elasticity	99.3GPa	14400 ksi
Poisson's Ratio	0.35	0.35
Fatigue Strength	125 MPa	18100 psi	5 E+5 cycles, Notched
Fatigue Strength	145 MPa	21000 psi	3 E+7 cycles, Unnotched
Fatigue Strength	175 MPa	25400 psi	5 E+3 cycles, Unnotched
Fatigue Strength	60 MPa	8700 psi	3 E+7 cycles, Notched
Shear Modulus	36.2 GPa	5250 ksi
Electrical Properties
Electrical Resistivity	3.97e-005 ohm-cm	3.97e-005 ohm-cm	Temp Coefficient is 0.0044/°C at 20°C
Magnetic Susceptibility	1.34E-06	1.34E-06	cgs/g; pure Zr
Critical Magnetic Field Strength, Oersted	47	47	Pure Zr
Critical Superconducting Temperature	0.595 - 0.625 K	0.595 - 0.625 K	pure Zr
Thermal Properties
Heat of Fusion	250 J/g	108 BTU/lb
CTE, linear 20°C	5.89 µm/m-°C	3.27 µin/in-°F	at 25°C
CTE, linear 250°C	6.3 µm/m-°C	3.5 µin/in-°F
CTE, linear 500°C	6.9 µm/m-°C	3.83 µin/in-°F
Specific Heat Capacity	0.285 J/g-°C	0.0681 BTU/lb-°F
Thermal Conductivity	22 W/m-K	153 BTU-in/hr-ft²-°F
Melting Point	1852 °C	3370 °F
Optical Properties
Emissivity (0-1)	0.32	0.32	650 nm; unoxidized pure Zr sample; total