Pure nickel UNS N02200 is used in the chemical industry for its corrosion resistance - particularly to alkalis. It is also used for its properties in shielding against electromagnetic interference and in transducers.
Are you interested in learning more about Nickel Base Alloy? Contact us today to secure an expert consultation!
These are used as soft magnetic materials, as glass-to-metal seals and as materials with defined thermal expansion properties.
Invar® (UNS K93600), with 36% nickel and the remainder iron, is unique in having an almost zero coefficient of thermal expansion around room temperature. This makes it valuable where high dimensional stability is required, such as in precision measuring instruments and thermostat rods. It is also used at cryogenic temperatures because of its very low thermal expansion rates.
Alloys containing 72-83% nickel have the best soft magnetic properties and are used in transformers, inductors, magnetic amplifiers, magnetic shields and memory storage devices.
These are highly resistant to corrosion by alkaline solutions, non-oxidizing salts and seawater. The best-known is Alloy 400.
These are highly resistant to reducing acids in the absence of oxidizing ions, such as ferric and cupric or dissolved oxygen. The best-known is Alloy B-2.
These are characterised by their high resistance to corrosion at both normal and high temperatures (resistance to scaling), good high-temperature strength and high electrical resistance. There are three main groups of alloys:
There are basically two groups of alloys:
These are highly corrosion-resistant, of which Alloy C-276 (N10276) is the best-known. They offer exceptional resistance to reducing acids such as hydrochloric and sulphuric. There are a number of variants based on this composition, which have modified the Cr and Mo levels and, in some cases, added Cu or W in order to extend the corrosion resistance to conditions that are more oxidising or more reducing. These include Alloy C-22 (N06022), Alloy 59 (N08059), Alloy C-2000 (UNS N06200), and Alloy 686 (N06686).
The addition of cobalt and molybdenum imparts solid-solution strengthening and high levels of creep-rupture strength to alloy 617 (UNS N06617). The addition of cobalt to HR-160 (N12160) provides outstanding resistance to various forms of high-temperature corrosion attacks, such as sulphidation and chloride attack in both reducing and oxidizing atmospheres.
55% nickel-titanium alloy (UNS N01555) (also known as Nitinol) has shape-memory properties. When formed at one temperature and then deformed at a lower one, it regains its original form when reheated. The transition temperatures can be adjusted through careful control of the composition. Medical devices and specialised connectors are two of specific the applications. The same alloy can also undergo considerable elastic deformation and still return to its original shape (super-elastic property). This property has been exploited for applications as diverse as spectacle frames and shock absorbers that provide earthquake resistance in historic stone buildings.
Pure nickel possesses a useful combination of properties, including corrosion resistance, good strength, and high ductility, even at extremely low temperatures. It also possesses useful electronic properties and special magnetic properties. Nickel is a particularly good catalyst for the hydrogenation of unsaturated compounds in vegetable, animal, and fish oils, converting them from liquids to solids. Natural oils treated in this way are used in such products as shortening, oleomargarine, and soap.
Nickel is essential as the base for oxide-coated cathodes used in all television tubes and all but the largest radio power tubes. Alloyed with about 2 percent tungsten plus a trace of magnesium, nickel is used as the cathode base in amplifiers for submarine cables that are expected to function for 20 years without attention.
Nickel also is an essential component of white-gold alloys widely used for jewelry. These alloys also contain nickel, copper, and zinc, all of high purity.
The white colour of nickel is attractive, and most of its alloys with copper are substantially white. Its ability to form strong, ductile alloys with many metals, including iron, chromium, cobalt, copper, and gold, is utilized in industry.
Nickel is resistant to corrosion by fluorine, alkalies, and a variety of organic materials. It remains bright on indoor exposure but tarnishes outdoors, although its corrosion rate is very low. Its low corrosion rate, coupled with its resistance to corrosion by sodium chloride and other chlorides used on roads during the winter, makes it essential as an undercoat on chromium-plated automotive trim. Heavy nickel plating is employed as a lining for tank cars and as a coating for the inner walls of large pipes and similar equipment in the chemical industry.
The addition of copper to nickel provides a series of useful alloys. Monel metal, 67 percent nickel and the balance essentially copper, is stronger than nickel and has broad corrosion-resisting applications. Extremely resistant to rapidly flowing seawater, it has many marine uses. The addition of a small percentage of aluminum and titanium renders it precipitation-hardenable; this high-strength version is widely used for propeller shafts. Increasing copper to 55 percent produces the electrical resistance alloy known as constantan, which is used as a thermocouple in conjunction with pure copper.
Contact us to discuss your requirements of NiCr Alloy. Our experienced sales team can help you identify the options that best suit your needs.
The 30 percent and 10 percent nickel-copper alloys, usually containing 0.5 percent and 1.5 percent iron, are widely used in the form of tubes for heat interchangers and condensers. Their resistance to seawater corrosion makes them important in desalination plants. Copper-based alloys containing a small percentage of nickel become precipitation-hardenable if 5–8 percent tin or a smaller amount of silicon or phosphorus is added. These have special uses.
The ancient Chinese alloy pai-t’ung, now known as nickel-silver, contains 10–30 percent nickel with the balance copper plus zinc. This alloy continues as a favoured base for silver-plated ware. It also is used as a spring material for relays and has numerous other applications.
An alloy of 25 percent nickel and 75 percent copper, essentially white in colour, was adopted for coinage by Belgium in 1860 and by the United States five years later. More recently it has been employed as the outer layer of copper-centred coins. Pure nickel was adopted by the Swiss for coinage in 1881; this use has spread to many other countries.
Magnetic alloysThe fact that nickel changes in length as it is magnetized makes it useful as an ultrasonic transducer in various underwater defense devices. Alloying nickel with about 21 percent iron has a spectacular effect in producing alloys with extraordinarily high magnetic permeability in weak fields. This type of alloy, known as Permalloy, discovered at Bell Telephone Laboratories in 1916, has had a great value in long-distance telephone transmission, including undersea cables. Other alloys of about 45–50 percent nickel and the balance iron, have been developed for magnetic uses at higher field strengths.
A remarkable group of nickel-containing permanent-magnet alloys was developed beginning in Japan in the early 1930s. An early example contained 25 percent nickel, 12 percent aluminum, and the balance iron. More powerful versions, such as Alnico V (containing 8 percent aluminum, 14 percent nickel, 24 percent cobalt, 3 percent copper, balance iron), developed in the Netherlands, were heat-treated in a magnetic field. These materials had a profound effect on the design of many electrical devices, including magnetic separators, DC motors, and automobile generators.
Thermal-expansion alloysInvar, an alloy containing 36 percent nickel, with the balance iron, is notable for its extremely small thermal expansion. Discovered in 1898, it has, along with later-developed nickel alloys, many applications ranging from thermostats to balance wheels for watches, metal-to-glass seals essential to electric lights, and radio tubes.
The first major market for nickel was in the production of nickel and nickel-chromium steels for armour plate, an application based on the work of James Riley of Glasgow, Scot., in 1889 and tests by the U.S. Navy in 1891 on armour plate from a French steel producer. Military demands supported the industry for many years, but, with the development of steam-turbine power plants, the automobile, agricultural machines, and aircraft, a whole new group of high-strength steels containing from 0.5 to about 5 percent nickel along with other metals such as chromium and molybdenum were developed. More recently, with a demand for steels for ultralow-temperature use with liquefied gases, steel of 9 percent nickel and alloys of higher nickel content have come into demand. These steels rely on carbon for hardening by heat treatment. The nickel toughens the steel and slows the hardening process so that larger sections can be heat-treated. A carbon-free iron alloy known as maraging steel has been developed. It contains 18 percent nickel, plus cobalt, titanium, and molybdenum. This alloy can be heat-treated to provide a tensile strength of some 2,000 megapascals (i.e., 21,000 kilograms per square centimetre, or 300,000 pounds per square inch), coupled with an elongation of 5 to 10 percent.
For more Resistance Heating Alloyinformation, please contact us. We will provide professional answers.