Atomic Number: 74
Atomic Symbol: W
Atomic Weight: 183.5
Melting Point: 3410℃ Boiling Point: 5927℃
Description: Hard, silver-white metal.
Tungsten has the highest melting point of all metals, and at temperatures over 1650℃ has the highest tensile strength. It has excellent corrosion resistance and is attacked only slightly by most mineral acids.
Tungsten is mainly used in following states:
Ferro-tungsten alloys: These alloys serve as an adding agent for manufacturing high-speed steel; The content of W is normally 70-85%. These steels are in most cases used for cutting tools, moulds, dies, and other special purposes.
Pure tungsten: most tungsten plates, foils, strips, large rods, and a part of wires are made from pure tungsten. Pure tungsten is easier to be processed from tungsten powder into bars, slab, and finally into wires, rods, plates and foils.
Tungsten doped with potassium, lanthanum, thorium or: Doped tungsten are mainly in the forms of wire and rods. Most tungsten wires doped with potassium or lanthanum are redrawn into fine wire for lighting industry, while tungsten rods doped with thorium or cerium are electrodes for gas protection arc welding.
Tungsten-copper alloy: W-Cu alloys are for electronic contacts and weight cubes.