Tungsten

Melting point 3415℃ （ the highest among all metal elements）

Melting point 5,555 °C

Density 19.3 g/cm³

The hardness of tungsten is also very high. For example, the hardness of tungsten carbide is close to that of diamond. In addition, tungsten also has good electrical and thermal conductivity, small expansion coefficient and other characteristics, so it is widely used in alloys, electronics, chemicals and other fields. Among them, cemented carbide is the largest consumer field of tungsten.

Tungsten wire has high luminous efficiency and long service life, so it is widely used in the manufacture of various bulb filaments, such as incandescent lamps, iodine tungsten lamps, etc. Tungsten filaments | wires can also be used to manufacture direct heating cathodes and grids of electronic oscillators. Thermal cathode heaters in various electronic instruments. In addition, tungsten is also used in radiological medicine, and tungsten wire some musical instruments also use tungsten wire.

Molybdenum

Melting point 2610°C

Boiling point 5560°C

Density 10.2g/cm³

Molybdenum is a silver-white metal that is hard and tough, has a high melting point, and has a relatively high thermal conductivity. It does not undergo oxidation reaction with air at room temperature.

Since molybdenum has high strength, high melting point, corrosion resistance, and wear resistance, it is widely used in steel, petroleum, chemical, electrical and electronic technology, medicine and agriculture areas.