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Ultrahard steel (超硬質スチール Chō Kōshitsu Suchīru?) is a material that is used in the making of blades capable of piercing and cutting the skin of Titans.
Uses
Ultrahard Steel is used for the blades wielded by the Survey Corps and other military weaponry.
Creation
The steel is created in the factories of production cities, where it is melted down and forged into the metal needed for the blades. The metal cannot be produced in any other place.[citation needed] It is made from a mix of iron bamboo and mixtures of rare metals to make not only stronger but also lighter.
The blades were created by Angel Aaltonen, a first-class weapons craftsman who collaborated with the Survey Corps 50 years before the fall of Wall Maria. He was also the creator of the vertical maneuvering equipment.[citation needed]