Materials
The first plate armour was that of bronze, being worn by elite soldiers in Greek armies in particular. Bronze, whilst easier to work with, was much less commonly available (requiring copper and tin, which are almost never found in close proximity). Iron was, however, adequate enough for the task, eventually becoming more popular because of its strength as well as its far greater availability to be used in the advanced militaries of Europe and the Middle East.
Gradually methods of making steel were perfected and steel replaced iron in most capacities except munition armour. Steel was continually being made stronger and thicker to protect from bullets but eventually the needed protection was too heavy and expensive for most troops.
In the 20th century titanium and super-hardened "ballistic steel" came to be used for trauma plates. Eventually ceramic plates made from aluminium oxide and silicon carbide were introduced as well.
Read more about this topic: Plate Armour
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