Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
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 steels contain 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 support tools and other parts. Tungsten magnet is the permanent magnet steel which contains 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 having high magnetization and coercivity.
Tungsten carbide base
Tungsten carbide has high hardness, wear resistance and refractory properties. These alloys are containing 85-95% of tungsten carbide and 5-14% of cobalt, cobalt as a binder metal makes the alloy have the necessary strength. They are mainly used for some alloys which processing the steel, it also has titanium, tantalum and niobium carbides. All of these alloys are produced by powder metallurgy. When heated to 1000-1100, they still have high hardness and wear resistance. The cutting speed of carbide cutting tools is faster than the best tool steel cutting tools. Carbide is mainly used for cutting tools, mining tools, and wortle, etc.
According to metal powder supplier, as the most refractory metal, tungsten is the composition of many heat 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 used for intense wear-resistance parts, such as aircraft engine valves, the working parts of hot knife, turbine wheel, excavating equipment, surface coating of ploughshares. In aviation rocket technology, as well as machine parts, engines and other sectors of some high strength instruments, the alloys of tungsten and other metals (such as tantalum, niobium, molybdenum, rhenium) are used as heat resistant materials.
Contact materials and high proportion alloy
Tungsten-copper alloy which manufactured by powder metallurgy has the good electrical conductivity and thermal conductivity of copper and silver, as well as wear resistance of tungsten. Therefore, it becomes very effective contact materials for manufacturing knife switch, circuit breakers, spot welding electrodes and other working parts. High proportion alloy which containing 90-95% of tungsten, 1-6% of nickel, 1-4% of copper, is used in manufacturing the rotors of gyroscope, aircraft, counterweight of control rudder, radiation shields and baskets of radioisotopes.
Electric vacuum lighting materials
Tungsten filament is the best material of incandescent filament and helical filaments. High operating temperatures (2200-2500) ensure a high luminous efficiency, and the small evaporation rate ensures the long life of wire. Tungsten used for manufacturing the direct-heated cathode and grid electrode of electronic oscillator tube, the cathode of high-voltage rectifier and hot cathode heater of various electronic instruments. Tungsten heater works in a hydrogen gas, inert gas or vacuum.
Tungsten compounds
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 is the catalyst of mordant and dye and the chemical industry producing high-octane gasoline. Tungsten disulfide in organic synthesis, for example, it was used as solid lubricants and catalyst in the preparation of synthetic gasoline. Treating tungsten ore can be obtained tungsten trioxide, and reduced tungsten trioxide with hydrogen will obtain tungsten powder, which widely used in tungsten material and tungsten metallurgical raw materials.
Article Source:http://www.mhcmp.com
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