Zirconium 702 is a high-performance alloy primarily composed of zirconium, with certain proportions of nickel, iron, silicon, and manganese. Below is a detailed introduction to Zirconium 702. For specific needs or inquiries, please get in touch with us.
Chemical Composition
Zirconium (Zr) content is over 99.2%.
Nickel (Ni) content is approximately 2%.
The content of elements such as Iron (Fe), Silicon (Si), and Manganese (Mn) does not exceed 1%.
Physical Properties
Density: Approximately 6.5 g/cm³.
Melting Point: High at 1852°C, allowing Zirconium 702 to maintain stable performance even in high-temperature environments.
Thermal and Electrical Conductivity: Excellent.
Linear Expansion Coefficient: Lower than titanium, approximately two-thirds that of titanium, resulting in minimal welding distortion and low stress, making it easier to weld.
Characteristics
1. Corrosion Resistance:
In various acid solutions, its corrosion rate in boiling hydrochloric acid at all concentrations is less than 0.025 mm/year.
In sulfuric acid environments, up to a concentration of 70%, Zirconium 702 exhibits excellent corrosion resistance.
Compared to other metal materials, its chemical corrosion resistance is significantly superior to cobalt alloys and many high-grade stainless steels, titanium, and aluminum alloys.
ZrO2 far outperforms titanium in resistance to oxidizing acids, such as sulfuric and hydrochloric acids.
ZrO2 maintains good corrosion resistance in most inorganic and organic acids, alkaline solutions, salt solutions, and some molten salts. However, it is not resistant to a few media, such as hydrofluoric acid, ferric chloride, cupric chloride, aqua regia, concentrated sulfuric acid, and wet chlorine gas.
It also exhibits some corrosion resistance to high-temperature and high-pressure water, steam, and liquid metals.
2. Mechanical Properties:
Tensile strength reaches 380 MPa.
Yield strength is 205 MPa.
The elongation is 16%, indicating that zirconium 702 possesses high strength and a certain degree of ductility.
3. High-Temperature Resistance:
It maintains stable performance even in high-temperature environments.
A well-adhered protective oxide film spontaneously forms on the surface. This oxide film exhibits strong self-healing properties at high temperatures, effectively protecting the zirconium 702 substrate from corrosion and damage even at temperatures of 300°C.
Applications
Due to its unique chemical composition and physical properties, zirconium 702 exhibits broad application prospects in a variety of fields:
Chemical Industry: Used in the manufacture of key components such as heat exchangers and valves, ensuring stable operation in corrosive media.
Aerospace Industry: Suitable for the manufacture of certain components in aircraft engines, improving flight safety and reliability.
Nuclear Industry: Used in the manufacture of key components such as reactor structures and fuel elements, ensuring the safe and stable use of nuclear energy.
Automotive Industry: Used in the manufacture of automotive engine parts and transmission system components, improving vehicle fuel efficiency and power performance.
Construction: Used in the manufacture of structural members for high-rise buildings, bridges, and other key components, improving building safety and stability.
In summary, zirconium 702 is a high-performance alloy material with a unique chemical composition and excellent physical properties, offering broad application prospects in a variety of fields.
