Tungsten is a unique bearing material. It possesses unique heat-resistance, insignificant coefficient of thermal expansion, high resistance to thermal creeping, good heat conductivity, high coefficient of electronic emission. It has high module of tensile/compression, resistance to corrosion, effect of acids, alkalis, concentrated solutions of sulfuric, nitric, salt, chloronitric acids. Chemical resistance, strength and biological safety make tungsten sheet an indispensable material for modern industry.
Tungsten is indispensable for details of X-ray techniques, targets of radio-electric tools, vacuum lamps, manufacturing of boats, heat resistant settings and cases. Tungsten sheet WA is used in manufacture of current injections for electron tubes, and heating parts of electrical furnace, Rapid development of modern robot technologies, instrument engineering, nuclear energetics, mechanical engineering, petrochemical industry, medicine increases demand for mill-products made out of refractory metals. Tungsten sheets are mostly used for manufacture of heating thermal screens (shields), vacuum electric devices, heat-resistant details of military-industrial complex, nuclear energetics, industrial chemical synthesis.
|Temperature of characteristic receiving in °С||20°С|
|Coefficient of linear thermal expansion α [1/degree]||43×10-6|
|Ultimate tensile strength kg/mm2||35|
|Specific heat at 20 °C [J/(kg/deg)]||0.134|
|Heat conductivity K [V/m*K]||300.173|
|Specific electric resistance R Оhm-mm2/m||0.054|
There are a few demerits:
— difficulty of tungsten obtaining in pure state;
— high volume weight (as gold has);
— brittleness at low temperature. Due to its unique properties, it can be processed (rolled, drawn, forged) only after heating up.
Tungsten sheet is manufactured out of tin bars with a help of special hot-cold rolling. As long as tungsten can easily react with atmospheric gasses, there are used the most modern technologies of chemical protection. Firstly, there are manufactured blanks (billets) with a help of powder metallurgy method. Then, it must be heated and rolled on forging rotary machine. There are obtained sheets with a very smooth surface. Oxides are deleted with hot solution of caustic soda or by ignition (t° 1000°C) in hydrogen atmosphere. Manufacturing quality control is performed at all steps of manufacture. The thinnest sheet is the lower heating for treatment it requires. Foil can be rolled at standard temperature. It can be stamped (squirted) into products of any required shape.
A joint of tungsten sheets is performed with a help of butt-seam or spot welding. But seam is nearly always brittle and recrystallized. The most reliable method is riveted joint. Tungsten can be easily soldered with nickel, silver, copper in non-oxidizing shielding atmosphere. Tungsten sheet is welded with nickel in order to obtain part for electronic devices,
Tungsten sheet supplier
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«Auremo» tungsten sheet supplier sells rare and refractory metals. Tungsten sheet is certificated. Quality is guaranteed by rigorous technology compliance of a manufacture. Our managers are always ready to answer any question and to give a knowledgeable assistance. A large assortment will not leave you without a choice. Buy tungsten sheet by connecting the nearest office. Phone numbers, e-mail addresses of the closest company’s offices are noted in section «Contacts». Order a service «Call-back» and our manager will help you to choose products that will fit your individual requirements.