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The tungsten steel of alloy tool steel contains 0.8-1.2% of tungsten;chromium-tungsten steels contain 2-2.7% of tungsten; chromium tungsten steelscontain 2-9% of tungsten; chromium-tungsten-manganese steels contain 0.5-1.6%of tungsten. Tungsten-containing steel is used for manufacturing various tools,such as drills, milling cutters, wortle, female die and male die, air supporttools and other parts. Tungsten magnet is the permanent magnet steel whichcontains 5.2-6.2% of tungsten, 0.68-0.78% of carbon, 0.3-0.5% of chromium.Tungsten-cobalt magnet is the hard magnetic material which contains 11.5-14.5%of tungsten, 5.5-6.5% of molybdenum, 11.5-12.5% of cobalt. All of them are havinghigh magnetization and coercivity.

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Tungstencarbide base

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Tungsten carbide has high hardness, wear resistanceand refractory properties. These alloys are containing 85-95% of tungstencarbide and 5-14% of cobalt, cobalt as a binder metal makes the alloy have thenecessary strength. They are mainly used for some alloys which processing thesteel, it also has titanium, tantalum and niobium carbides. All of these alloysare produced by powder metallurgy. When heated to 1000-1100%3,they still have high hardness and wear resistance. The cutting speed of carbidecutting tools is faster than the best tool steel cutting tools. Carbide ismainly used for cutting tools, mining tools, and wortle, etc.

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According to metal powder supplier, as the most refractory metal, tungsten is the composition of manyheat resistant alloys, such as the alloy which contains 3-15% of tungsten,25-35% of chromium, 45-65% of cobalt, 0.5-0.75% of carbon, mainly thread drill bits used for intensewear-resistance parts, such as aircraft engine valves, the working parts of hotknife, turbine wheel, excavating equipment, surface coating of ploughshares. Inaviation rocket technology, as well as machine parts, engines and other sectorsof some high strength instruments, the alloys of tungsten and other metals(such as tantalum, niobium, molybdenum, rhenium) are used as heat resistantmaterials.

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Contactmaterials and high proportion alloy

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Tungsten-copper alloy which manufactured by powdermetallurgy has the good electrical conductivity and thermal conductivity ofcopper and silver, as well as wear resistance of tungsten. Therefore, itbecomes very effective contact materials for manufacturing knife switch,circuit breakers, spot welding electrodes and other working parts. Highproportion rock drill bits alloy which containing 90-95% of tungsten, 1-6% of nickel, 1-4% ofcopper, is used in manufacturing the rotors of gyroscope, aircraft,counterweight of control rudder, radiation shields and baskets ofradioisotopes.

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Electricvacuum lighting materials

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Tungsten filament is the best material ofincandescent filament and helical filaments. High operating temperatures (2200-2500%3)ensure a high luminous efficiency, and the small evaporation rate ensures thelong life of wire. Tungsten used for manufacturing the direct-heated cathodeand grid electrode of electronic oscillator tube, the cathode of high-voltagerectifier and hot cathode heater of various electronic instruments. Tungstenheater works in a hydrogen gas, inert gas or vacuum.

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Tungstencompounds

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Sodium tungstate was used for tungsten metal,tungstic acid and the manufacture of tungstate as well as dyes, pigments, inks,electroplating, etc., also as catalysts. Tungstate in the textile industry isthe catalyst of mordant and dye and the chemical industry producing high-octanegasoline. Tungsten disulfide in organic synthesis, for example, it was used assolid lubricants and catalyst in the preparation of synthetic gasoline. Treatingtungsten ore can be obtained tungsten trioxide, and reduced tungsten trioxidewith hydrogen will obtain tunhttps://blog.goo.ne.jp/jeromephoe