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Metal is one of the oldest materials, for centuries it has been shaped into tools, weapons, and practical objects. Greeks used bronze and iron for tying stone blocks together without mortar, as well as statues of philosophers, heroes, athletes, etc, and the Romans used lead and copper for water pipes and roofing. Romans were the first to to master the use of copper, soldering and brazing techniques, the Pantheon had a copper roof and cornice. Iron became an important role in architecture in the eighteenth century, as it was manufactured for structural beams, columns, and machinery. Steel in the nineteenth century became a revolutionary material and with concrete revolutionized the construction industry.

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CHEMICAL PROPERTIES:
-Corrosion
-Resistant
-Flammable
-Reactive

PHYICAL PROPERTIES:
-High melting point
-Ductile
-Malleable
-Heat conductivity
-Electricity conductivity

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Forming operation on a solid bar of metal, at elevated temperature with the aim of shaping and controlling the grain structure.

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Magnetic

Durable

Contain iron

Electricity conductors: steel, iron

Oxidize easily

Strongest metals

Recyclable

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Easy to fabricate

Easy to install

Very good appearance

Do not contain iron

Low density

Non-magnetic

Aluminium, copper, lead

Resistant to corrosion

Thermal and electricity conductivity

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Manufacturing process produces carbon dioxide and requires a lot of energy

Metals are non-renewable materials, they must be recycled

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Metals are extremely durable

Repairing metals can be expensive, labor intensive and overall difficult.

Metals are more well kept in stable temperatures. Light, heat and moisture can cause metals to corrode