ThePipingMart Blog Grades Zircaloy-2 Zirconium Alloy (UNS R60802) – Composition,  Properties and Uses

Zircaloy-2 Zirconium Alloy (UNS R60802) – Composition,  Properties and Uses

UNS R60802

UNS R60802 is a high-strength, corrosion-resistant nickel alloy commonly used in high-temperature industrial applications. It is a non-magnetic alloy that can withstand extreme temperatures and pressure, making it suitable for aerospace, chemical processing, and oil and gas. In this blog, we will delve into the different properties and uses of R60802 and its composition and heat treatment processes.

Zircaloy-2 Composition

R60802 comprises nickel, chromium, molybdenum, and titanium, with trace amounts of other elements. Its chemical composition gives it high strength and excellent corrosion resistance properties. Additionally, the inclusion of titanium provides R60802 with significant grain-stabilizing benefits.

Zircaloy-2 Physical Properties

UNS R60802 has an excellent combination of physical properties such as high toughness, melting point, and resistance to heat and oxidation. It also has a low coefficient of thermal expansion which means it can expand and contract with temperature changes without losing shape. It is non-magnetic and has good electrical conductivity and flexibility even at high temperatures.

Zircaloy-2 Mechanical Properties

R60802 has excellent mechanical properties that make it suitable for high-stress applications. It has high tensile strength, high fatigue resistance, and low flexibility. The alloy has an excellent resistance to creep deformation, which means it is not likely to deform or break under long-term high-stress environments.

Zircaloy-2 Uses

R60802 is ideal for high-temperature applications such as gas turbines, jet engines, and chemical processing plants. Its corrosion-resistant properties make it suitable for seawater and offshore oil rigs. Additionally, R60802 is a popular material for aerospace applications due to its anti-galling and anti-seizing properties.

Zircaloy-2 Hardness

R60802 has a high hardness rating due to its chemical composition and processing. Its high hardness makes it resistant to wear and deformation and retains its shape in high-stress environments.

Zircaloy-2 Heat Treatment

The heat treatment process of R60802 is crucial in improving its strength and flexibility. The alloy is usually annealed at high temperatures for extended periods, resulting in improved grain structure, reduced internal stress, and increased strength.

Zircaloy-2 Welding

R60802 is weldable but requires rigorous pre-weld and post-weld heat treatment. To achieve high-quality welds, the alloy should always be cleaned and free from contaminants during welding. Specific welding techniques such as tungsten inert gas welding (TIG) and gas tungsten arc welding (GTAW) are recommended for welding R60802.

Zircaloy-2 Corrosion Resistant

UNS R60802 has excellent resistance to cracking, pitting and crevice corrosion, making it an ideal material for harsh chemical environments. Its corrosion-resistant properties remain even at high temperatures and pressure.


In conclusion, UNS R60802 is a high-strength nickel alloy with excellent mechanical and physical properties, making it ideal for use in high-stress and high-temperature industrial applications. From its corrosion-resistant properties to its weldability, R60802 is a versatile material that continues to hold its place in various industries. Nevertheless, it requires skilled handling and processing to ensure it retains its excellent properties and serves its intended purpose.

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