Zircaloy-4(Alloy Zr4) (UNS R60804)

Topics Covered

Introduction
Chemical composition
Physical Properties
Mechanical Properties
Thermal Properties

Introduction

Zirconium is a refractory metal having excellent corrosion resistance, low thermal neutron cross section and good heat resistance. Zirconium alloys have higher thermal properties than other refractory alloys and high thermal conductivity than stainless steel alloys. High corrosion resistance of these alloys is due to the protection of a metal-oxide interface by a tightly adhered protective oxide film. Standard fabrication techniques are used to manufacture the alloys

The following datasheet provides a detailed description of zircaloy-4.

Chemical composition

The following table shows the chemical composition of zircalloy-4.

Element Content (%)
Zirconium, Zr 97.56-98.27
Tin, Sn 1.20-1.70
Iron + Chromium, Fe+Cr 0.28-0.37
Iron, Fe 0.18-0.24

Physical Properties

The physical properties of zircalloy-4 are outlined in the following table.

Properties Metric Imperial
Density 6.56 g/cm³ 0.237 lb/in³
Melting point 1850°C 3360°F

Mechanical Properties

The mechanical properties of zircalloy-4 are outlined in the following table.

Properties Metric Imperial
Tensile strength (room temperature, transverse) 514 MPa 74600 psi
Yield strength (room temperature, longitudinal) 381 MPa 55200 psi
Modulus of elasticity 99.3 GPa 14400 ksi
Poissons ratio 0.37 0.37
Hardness, Rockwell B 89 89

Thermal Properties

The thermal properties of zircalloy-4 are outlined in the following table.

Properties Metric Imperial
Thermal expansion coefficient (@20°C/68°F) 6 µm/m°C 3.3 µin/in°F
Thermal conductivity 21.5 W/mK 149 BTU in/hr.ft².°F

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