Tungsten wire VA 8 micron - 500 micron
It would seem, what could be simpler than the wire — one of the most popular products of metal? Especially because, as claimed by Oscar Wilde: in life — the simpler, the better. However, the manufacture of tungsten wire is connected with several difficulties.
It is made of the most refractory of the metals with t° melting +3422°C. tungsten has a high strength, heat resistance, resistance in aggressive industrial environments. This wire retains hardness at high temperatures, wear-resistant, the wire has a minimal coefficient of thermal expansion that allow you to use it for the most important products. The wire has a high modulus of compression and tension, high electrical resistance, great thermal conductivity. The wear resistance, high temperature creep made it indispensable in modern industry.
Wire group A, B, C (black) stamps VA, VRN, RF is produced using powder metallurgy technology. Billet rods serve powder, which is heated and rolled a rotary swaging machine to a diameter of 1−10 mm. Over a thin wire called a filament. Its composition may add chromium, cobalt, carbon. In this case, its strength is increased by 30%. 1 gram of tungsten is rolled into a thread length of 3.5 meters, enough to make 700 60-watt bulbs. Due to this the demand of the global electrical production to satisfy 2 of the railroad car of tungsten per year.
For the production of cathodes and heaters of electronic devices, electronic and x-ray techniques use tungsten wire grade VM, resistant to shock and vibration at t°to 2100 °C. Brand VRN — for springs, hooks, cathodes electronic and gas discharge devices, inputs, traverse etc. parts that do not require tungsten with special additives. Due to the high resistivity and a unique light output, a tungsten filament is indispensable in the lighting. Tungsten filament for light sources is made according to GOST 19 671−91 of brands BA, HF, VRN, with a diameter of 19.5 microns — 1.5 mm. It is used for the production of spiral cathodes of electronic devices, springs of electronic and semiconductor devices, loop respiratoorse cathodes, heaters, etc. Tungsten grid and filters used in the chemical industry. Tungsten wire is not only for the production of surgical instruments. Mechanical engineering, textile industry, aircraft and rocket construction it is made the most critical components. Have a non-consumable tungsten electrodes exceptional heat resistance and reliability. They allow you to bind the sheets of steel, copper, aluminum, brass, thin and smooth seam.
THE TUNGSTEN WIRE GOST 18903−73
|Grade of tungsten||Group||Surface condition||Ø µm||Appointment|
|VA||And||Black||10 — 1500||Spiral lamps. Spiral cathodes and heaters of electronic devices, springs of semiconductor devices.|
|VA||HELL||Black high manufacturability||50 — 1500||Heaters of cathodes and directly heated cathodes with spiral design factor of the core 1 and 2.2|
|VA||AE||Black high-heat resistance||500 — 1200||Directly heated spiral cathodes and heaters cathodes with the working t° or t° heat treatment above 2000°C|
|VA||AP||Black||10 — 200||Loopback heaters, nets, and springs of electronic devices, asperuloside cathodes.|
|VA||B||Purified||11 — 500||Support, hooks, springs, spiral bulbs, spiral heaters and cathodes electronic and gas discharge devices.|
|VA||G||Purified and annealed||11 — 500||Loopback heaters, nets, asperuloside cathodes. Some spotlamp spiral filament|
|VA||T||Etched||5 — 12||. Mesh electronic devices Heaters and cathodes of the directly heated helical and non-helical cathodes.|
|VA||IT||Pickled and annealed||5 — 12||. Mesh electronic devices Heaters and cathodes of the directly heated helical and non-helical cathodes.|
|VM||And||Black||11 — 1500||Spiral spotlamp filament and parts of the instrument, working at t° to 2100 °C under high mechanical loads (impacts, vibrations)|
|VRN||And||Black||800 — 1500||Glands, crosshead and other parts that do not require doped tungsten.|
|W-7||And||Black||20 — 1500||Springs, hooks, cathodes of some electronic and gas discharge devices|
|VT-10||And||Black||25 — 1500||The cathodes electronic and gas discharge devices|
|VT-15||And||Black||150 — 1500||The cathodes electronic and gas discharge devices|
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