Nickel Alloys

Nickel Alloys

• Wrought Nickel

  Pure nickel UNS N02200 is widely utilized in the chemical industry due to its exceptional corrosion resistance, especially against alkalis. It also serves effectively in electromagnetic interference shielding and in transducers.

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• Nickel-Iron Alloys

  These alloys are used as soft magnetic materials, metal-to-glass seals, and for their defined thermal expansion properties. Invar® (UNS K93600), containing 36% nickel and the remaining iron, boasts an almost zero coefficient of thermal expansion around room temperature. This property is vital for applications needing high dimensional stability like precision measuring instruments and thermostat rods. At cryogenic temperatures, Invar® performs exceptionally well because of its low thermal expansion rates. Alloys with 72-83% nickel possess superior soft magnetic properties and find use in transformers, inductors, magnetic amplifiers, magnetic shields, and memory storage devices.

• Nickel-Copper Alloys

  These alloys are highly resistant to corrosion by alkaline solutions, non-oxidizing salts, and seawater. The most prominent among them is Alloy 400.

• Nickel-Molybdenum Alloys

  Known for their resistance to reducing acids in the absence of oxidizing ions like ferric, cupric, or dissolved oxygen, Alloy B-2 stands out as the most well-known among them.

• Nickel-Chromium Alloys

  These alloys are renowned for their high resistance to corrosion under normal and high temperatures, excellent high-temperature strength, and superior electrical resistance. They are generally grouped as follows:

  • Ni-Cr (and Ni-Cr-Fe) alloys with high electrical resistance, like UNS N06008 and C-Grade (UNS N06004), are ideal for heating elements.
  • Ni-Cr alloys (with Fe and other elements) that offer excellent corrosion resistance: popular examples include Alloy 600 (UNS N06600) and Alloy 601 (UNS N06601).
  • Ni-Cr alloys designed for high-temperature strength and creep resistance, mostly age-hardenable: for instance, Alloy X-750 (UNS N07750).

• Nickel-Chromium-Iron Alloys

  These can be categorized into two main groups:

  • Ni-Cr-Fe alloys with excellent high-temperature strength and resistance to oxidation, carburization, and other corrosive conditions. Notable examples are alloy 800 (UNS N08800) and its derivatives 800H (UNS N08810) and 800HT (UNS N08811).
  • Ni-Cr-Fe alloys (with Mo and Cu) are especially resistant to specific corrosive environments. Alloy 825 (UNS N08825) and Alloy G-3 (UNS N06985) are acclaimed for exceptional resistance to sulfuric and phosphoric acids, respectively.

• Nickel-Chromium-Molybdenum Alloys

  These are highly corrosion-resistant, with Alloy C-276 (N10276) being the most recognized. They offer superb resistance to reducing acids such as hydrochloric and sulfuric. Various modifications of this alloy, such as Alloy C-22 (N06022), Alloy 59 (N08059), and Alloy C-2000 (UNS N06200), have been made to improve resistance to different corrosive conditions.

• Nickel-Chromium-Cobalt Alloys

  The inclusion of cobalt and molybdenum enhances solid-solution strengthening and high levels of creep-rupture strength in alloy 617 (UNS N06617). Cobalt addition in HR-160 (N12160) offers excellent resistance to high-temperature corrosion attacks, including sulfidation and chloride attack in various atmospheres.

• Nickel-Titanium Alloys

  The 55% nickel-titanium alloy (UNS N01555), also known as Nitinol, exhibits shape-memory properties. It can return to its original form upon reheating after being deformed at a lower temperature. Through careful composition control, transition temperatures can be fine-tuned. This alloy is used predominantly in medical devices and specialized connectors. Furthermore, it demonstrates super-elastic properties, allowing substantial elastic deformation and a return to its original shape. This characteristic is utilized in products like spectacle frames and earthquake-resistant shock absorbers for historic buildings.

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Nickel Chrome (NiCr) | Coil elements, resistance wire ...