Nickel 200 is a commercially pure nickel grade, recognized for its high nickel content and a set of desirable properties that make it versatile across industrial applications. Classified as a wrought nickel alloy, it is valued for its exceptional corrosion resistance-particularly in alkaline environments, organic compounds, and neutral salt solutions-as well as its excellent ductility, thermal conductivity, and electrical conductivity.
This material retains its ductility even at cryogenic temperatures (as low as -270°C), which distinguishes it from many metals that become brittle in extreme cold. It is also highly formable, allowing it to be easily fabricated into various shapes such as sheets, plates, pipes, tubes, and forgings through processes like rolling, welding, and machining.
Nickel 200 is often used interchangeably with its close counterpart, nickel 201, which has a lower carbon content (to minimize carbide precipitation at high temperatures). However, nickel 200 is preferred in applications where moderate temperature exposure (up to around 315°C) is expected, as its slightly higher carbon content does not compromise performance in such conditions. Overall, it serves as a reliable material in industries requiring corrosion resistance, conductivity, and formability.
The chemical composition of nickel 200 is defined by strict standards (such as ASTM specifications) to ensure consistency in its properties. The key components are as follows:
Nickel (Ni): Minimum 99.6% by weight. This high nickel content is responsible for its core properties, including corrosion resistance and conductivity.
Carbon (C): Maximum 0.15%. Carbon is present in small amounts but is controlled to avoid excessive carbide formation, which could reduce ductility.
Iron (Fe): Maximum 0.20%. Iron is a common impurity but is limited to prevent adverse effects on corrosion resistance.
Manganese (Mn): Maximum 0.30%. Manganese acts as a deoxidizer during manufacturing, helping to remove impurities and improve fabricability.
Copper (Cu): Maximum 0.25%. Copper is allowed in trace amounts but does not significantly impact the material's performance.
Other impurities: Total of all other elements not specified above must not exceed 0.50%. These may include elements like sulfur, silicon, or zinc, but their concentrations are strictly minimized.
This composition balances purity with practicality, ensuring nickel 200 maintains its corrosion resistance, ductility, and formability while remaining cost-effective to produce.
Yes, nickel 200 is magnetic. Nickel is a ferromagnetic metal, meaning it is attracted to magnetic fields and can be magnetized itself. Since nickel 200 is a commercially pure nickel grade (with over 99.6% nickel content), it retains this ferromagnetic property.
Its magnetic behavior is evident at room temperature and persists across a wide range of temperatures, though like other ferromagnetic materials, it loses its magnetism above a specific Curie temperature. For nickel, the Curie temperature is approximately 358°C (676°F). Below this temperature, nickel 200 remains magnetic; above it, it becomes paramagnetic (weakly attracted to magnetic fields).
This magnetic property is worth noting in applications where magnetism could interfere with equipment (e.g., certain electronic components) or where magnetic properties are intentionally utilized (e.g., in magnetic shielding or sensors). However, its ferromagnetic nature does not overshadow its primary advantages, such as corrosion resistance, which drive its use in most industrial settings.
