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The commercial forms of nickel and nickel-base alloys are fully austenitic and are used/selected mainly for their resistance to high temperature and aqueous corrosion.
Commercially Pure and Low-Alloy Nickels. Nickel is supplied to the producers of nickel alloys in powder, pellets, or anode forms. This has led to a whole series of alloy modifications, with controlled compositions having nickel contents ranging from about 94% to virtually 100%.
These materials are characterized by high density, offering magnetic and electronic property capabilities. They also offer excellent corrosion resistance to reducing environments, along with reasonable thermal transfer characteristics. Some nickels of commercial importance include:Nickel 200, Nickel 201, Nickel 205, Nickel 270 and 290, Permanickel Alloy 300, Duranickel Alloy 301.
Nickel-copper alloys have been found to possess excellent corrosion resistance in reducing chemical environments and in sea water, where they deliver excellent service in nuclear submarines and various surface vessels. By changing the various proportions of nickel and copper in the alloy, a whole series of alloys with different electrical resistivities and Curie points can be created. Some nickel-copper alloys of commercial importance include: Alloy 400 (66% Ni, 33% Cu), Alloy R-405, Alloy K-500.
The nickel-chromium and nickel-chromium-iron series of alloys led the way to higher strength and resistance to elevated temperatures. Today they also form the basis for both commercial and military power systems. Two ofthe earliest developed Ni-Cr and Ni-Cr-Fe alloys were:
Some high-temperature variants include:
Some corrosion-resistant variants in the Ni-Cr-Fe system include:
Iron-Nickel-Chromium Alloys. This series of alloys has also found extensive use in the high-temperature petrochemical environments, where sulfur-containing feed stocks (naphtha and heavy oils) are cracked into component distillate parts. Not only were they resistant to chloride-ion stress-corrosion cracking, but they also offered resistance to polythionic acid cracking. Some alloys of commercial importance include:
The 800 alloy series offers excellent strength at elevated temperature (creep and stress rupture).
Some corrosion variants in the Fe-Ni-Cr system include:
Controlled-expansion alloys include alloys in both the Fe-Ni-Cr and Fe-Ni-Co series. Some alloys of commercial importance include:
The 900 alloy series offers very unusual characteristics and properties. Alloys 903, 907, and 909 were all designed to provide high strength and low coefficient of thermal expansion for applications up to 650 °C.
Nickel-lron Low-Expansion Alloys. This series of alloys plays a very important role in both the lamp industry and electronics, where glass-to-metal seals in encapsulated components are important. The nickel alloys are chosen for a variety of reasons.
Some alloys of commercial importance include:
Soft Magnetic Alloys. The nickel-iron alloys also offer an interesting set of magnetic permeability properties, which have played an important part in switch gear and for direct current (dc) motor and generator designs.
Welding Alloys. Welding products for nickel alloys have similar compositions to the base metals, although additions of aluminum, titanium, magnesium, and other elements are made to the filler metals and welding electrodes to ensure proper de oxidation of the molten weld pool and to over-come any hot-short cracking and malleability problems.