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In page Damascus steel:

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The reputation and history of Damascus steel has given rise to many legends, such as the ability to cut through a rifle barrel or to cut a hair falling across the blade. Although many types of modern steel outperform ancient Damascus alloys, chemical reactions in the production process made the blades extraordinary for their time, as Damascus steel was very flexible and very hard at the same time.[citation needed] In fact, extant examples of patterned crucible steel swords were often tempered in such a way as to retain a bend after being flexed past their elastic limit.[1]