[Know Tungsten] History of Tungsten - III

First, tungsten-containing steels were patented in 1858, leading to the first self-hardening steels in 1868.  High speed steels with tungsten additions up to 20% were first exhibited at the World Exhibition in Paris in 1900, and revolutionized engineering practice in the early 20th century. Such steels (Taylor- and White) are still used today in practically every machine shop of the world.

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