Leather metal

Japanese: 皮金 - かわがね
Leather metal
The term "katana" refers to the surface iron of a sword that encases the core of the blade. This is made from carbon steel that has been treated at low temperatures and then folded and forged to make it uniform and hard, giving the sword its strength and resistance to bending.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 (刀をつくるとき、刀身のしんにする鉄に対して) しんを包む、刀身の表面の鉄。低温度で処理された炭素鋼を折り返し鍛練を加えて硬度の高い純一なものにした地金を用い、刀に折れ曲らない強靱さを与える。

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