Hardware products are auxiliary and accessory manufactured products used in daily life and industrial production. Mainly contains gold, silver, copper, iron, tin and other metal materials.
1, the king:
It is a metallic element with symbol Au and atomic number 79. The elemental form of gold (free form), commonly known as gold, is a kind of precious metal, in nature, gold in the form of elemental gold in rock or gold grains, underground veins and alluvial layer.
2, silver:
It is a transition metal with the chemical symbol Ag. Silver is one of the metals known and used in ancient times. It is an important precious metal. Silver exists in nature as a simple substance, but most of it exists in the form of combination in silver ore. The physical and chemical properties of silver are relatively stable, with good thermal and electrical conductivity, soft quality and rich ductility.
3, copper:
It is a metal element and a transition element, chemical symbol Cu, English copper, atomic number 29. Pure copper is a soft metal, the surface just cut with a reddish orange metallic luster, the elemental is purplish red. Good ductility, high thermal and electrical conductivity.
4, iron:
It is a metal element, atomic number 26, iron elemental chemical formula: Fe, English name: iron. The average relative atomic mass is 55.845. Pure iron is white or silvery white and has a metallic luster. Melting point 1538℃, boiling point 2750℃, soluble in strong acid and medium strong acid, insoluble in water.
5, tin:
It is a metal element, inorganic, ordinary form of white tin is a silver luster of low melting point metal, in the compound is divalent or tetravalent, at room temperature will not be oxidized by air, in nature mainly in the form of dioxide (cassiterite) and various sulfide (such as sulfide).