There are no surviving texts which describe how to create or harden and temper the armor worn by knights of the Medieval period. Crossbows which were invented in the 13th century were up to 7x more powerful than a professional archer with the strongest of arms. The reason carbon makes iron into steel is because in pure iron, atoms are stacked like marbles and when pushed or pulled, the atoms slide past eachother. When carbon is introduced, the carbon becomes trapped in between the iron atoms and...
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