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Tungsten carbide is an important compound in the metalworking, mining, and petroleum industries. Alloys such as high-speed steel, cristite, and stellite, used in high-speed tools, contain tungsten. Other important tungsten compounds are calcium and magnesium tungstates, which are used in fluorescent lighting, and tungsten disulfide, which is used as a high-temperature lubricant at temperatures up to 500 deg C. Tungsten compounds also find uses in the chemical, paint, and tanning industries.Heavy tungsten alloys contain 90% or more tungsten with nickel, iron, or copper added. Unlike pure tungsten, these materials can be conventionally machined and are less expensive.Copper tungstent alloy are known for good thermal and electrical conductivity, low thermal expansion, and resistance to erosion from arcing.Thus, they are often used as electrical contacts, particularly in high voltage applications
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