Nickel is extremely commonly used in both its alloyed and elemental form for a wide range of applications and industries. Nickel essentially is quite a versatile material that can be alloyed with almost any other metal.
Nickel Alloys basically refers to the alloys that have nickel as the prime element in its composition. Complete solid solubility is known to be there between copper and nickel, while on the other hand, wide solubility ranges between chromium, iron, and nickel. These factors make it possible to form a number of alloy combinations with Nickel pipes and pipe fittings.
Here are some of the popular categories of nickel alloys:
- Nickel-Iron Alloys: This is used commonly as materials having defined thermal expansion properties, as well as soft magnetic materials. Having 36% nickel and the remainder iron, Invar® is a unique alloy that has near to zero coefficient of thermal expansion around room temperature. This feature makes this material quite valuable in applications where high dimensional stability is needed, such as thermostat rods and precision measuring instruments. The alloys that contain around 72-83% nickel are known to have great soft magnetic properties and subsequently used in magnetic shields, inductors, and transformers.
- Nickel-Copper Alloys: These nickel alloys are extremely resistant to corrosion by seawater, alkaline solutions, and non-oxidizing salts. Alloy 400 is the best-known nickel-copper alloy.
- Nickel-Molybdenum Alloys: In the absence of oxidizing ions, such alloys tend to be extremely resistant to reducing acids. Alloy B-2 is the best known nickel-molybdenum alloy.
- Nickel-Chromium Alloys: These alloys are majorly characterized by their extreme resistance to corrosion in both high and normal temperatures, as well as high electrical resistance and commendable high-temperature strength.
- Nickel-Chromium-Iron Alloys: Such nickel alloys include two major groups of alloys:
Ni – Cr – Fe alloys that have the capacity to resist carburization, oxidation and many other types of high-temperature corrosion, while also having incredible strength at high temperatures. The best-known alloy of this group is Alloy 800, as well as its variants 800HT and 800H.
Ni – Cr – Fe (with Mo and Cu) alloys are known to have great corrosion resistance in distinguished applications. Alloy 825 is among the best-known examples of this category, and it tends to provide high resistance to sulphuric acid. Alloy G-3 is another popular material that tends to provide remarkable corrosion resistance to a number of complex solutions featuring oxidizing acids, as well as to commercial phosphoric acids. Due to their high versatility, high corrosion resistance and remarkable heat tolerance, alloys steel are used in a wide range of applications, right from nuclear power markets to steam and aircraft gas turbines.
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