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In page Damascus steel:

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O. M. Becker, writing on steel used for tool-making, claimed in 1910 that ancient Damascus alloys remained unequaled even in his own time in terms of tempering quality.[1] He mentions, however, that modern electric steel is said to outperform crucible steel, a category which includes Damascus steel.[2] The production process of Damascus steel and the traces of elements such as tungsten, nickel and manganese found in it, which are also used in modern high-speed varieties, made the blades very flexible and very hard at the same time, extraordinary qualities considering their age.[3] 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.[citation needed]