The use of tungsten


Currently, there is about 50% of the world’s tungsten ore mined used for high-quality steel smelting, about 35% for the production of hard steel, about 10% for the system tungsten wire, and about 5 % used for other purposes. Tungsten can be used to manufacture guns, metal cutting blades, drill bits, hard mold, wire drawing dies and so on. It has a wide range of uses, including mining, metallurgy, machinery, construction, transportation, electronics, chemical industry, light industry, textile, military, aerospace, technology and other industrial fields.

Tungsten is part of non-ferrous metals, and also an important strategic metal. Tungsten ore was known as the “heavy stone” in ancient times. In 1781, the Swedish chemist discovered scheelite, and extracted the new elements acid – tungstic acid. The Spaniards discovered wolframite and also extracted the tungstic acid in 1783. In the same year, with the carbon reduction of tungsten trioxide, it was the first time to obtain the tungsten powder, and named the element. The content of tungsten in the crust is 0.001%. There are 20 kinds of tungsten-containing minerals have been found.

The formation of tungsten deposit is generally associated with granitic magma activity. After smelting of tungsten is a silver-white shiny metal which has a extremely high melting point and great hardness.
Tungsten is a rare and refractory metal, belonging to the sixth cycle of the periodic table (the second longest cycle) of the Group VIB. Tungsten’s chemical property is very stable. It does not react with air and water at room temperature, or is insoluble in hydrochloric acid, sulfuric acid, nitric acid and base solutions. Aqua regia can only make its surface oxidation, but it will dissolve in a mixture of nitric acid and hydrofluoric acid. It can combine with chlorine, bromine, iodine, carbon, nitrogen, and sulfur at high temperatures, but not with hydride.

Tungsten is widely used in modern technology in a state of pure metals and the state of alloys system. There are alloy steel, hard alloy with tungsten carbide based, abrasion-resistant and heat-resistant alloys mainly in the state of alloys system. And the incandescent lamps produced by tungsten filament and other lighting products are connect with us the most with in our daily lives. Tungsten is use for the tube production, radio electronics and X-ray technology as tungsten filament, tungsten ribbon and various forging components. Tungsten is the best material used for the manufacture of white filaments and spiral weaving silk.