Grade 704 Zirconium (Zr-1.5Sn) Technical Data Sheet
Alloy Overview
Grade 704 Zirconium (Zr-1.5Sn) is a zirconium-tin alloy with 1.5% tin (Sn) as the primary alloying element, along with controlled levels of iron (Fe), chromium (Cr), hafnium (Hf), and oxygen (O). It combines zirconium’s inherent corrosion resistance with tailored mechanical properties, making it suitable for applications in demanding environments. The minimum zirconium content is 97.5% (including a maximum of 4.5% hafnium).
Chemical Composition (Weight %)
Component
Content Range
Zr (Zr + Hf)
Min 97.5 (balance)
Sn
1.5
Fe + Cr
0.3
Hf
Max 4.5
O
0.18
Physical Properties
Property
Metric
English
Density
6.56 g/cc
0.237 lb/in³
Mechanical Properties
Property
Metric
English
Notes
Tensile Strength (Ultimate)
Min 413 MPa
Min 59,900 psi
Tensile Strength (Yield, 0.2%)
Min 241 MPa
Min 35,000 psi
0.2% offset
Elongation at Break
14%
14%
Measured in 50 mm
Modulus of Elasticity
99.3 GPa
14,400 ksi
Poisson’s Ratio
0.37
0.37
Shear Modulus
36.2 GPa
5,250 ksi
Electrical Properties
Property
Metric
English
Electrical Resistivity
7.4e-005 ohm-cm
7.4e-005 ohm-cm
Thermal Properties
Property
Metric
English
Notes
Linear CTE (20°C)
6 μm/m-°C
3.33 μin/in-°F
Measured at 25°C
Specific Heat Capacity
0.285 J/g-°C
0.0681 BTU/lb-°F
Thermal Conductivity
21.5 W/m-K
149 BTU-in/hr-ft²-°F
Melting Point
1850°C
3360°F
Key Features & Applications
Corrosion Resistance: Retains zirconium’s excellent resistance to aggressive media (e.g., high-temperature water, acids), making it suitable for chemical processing and nuclear applications.
Tin Alloying: The 1.5% tin addition enhances mechanical stability at elevated temperatures, balancing strength and ductility for components under sustained stress.
Typical Uses: Heat exchangers, fuel cladding in nuclear reactors, and piping systems in corrosive or high-temperature environments.
