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Tamahagane (玉鋼) is a general term for steel, not used prior to the Meiji Era, literally meaning "precious steel". Steel is smelted at Shimane facility for Japanese swords (nihontō (日本刀), commonly known as katana (刀)) by contemporary Japanese forge masters like Kihara Akira and Gassan Sadatoshi is still smelted in a tatara.
The steel used in sword production is known as tamahagane (玉鋼:たまはがね), or "jewel steel" (tama – ball or jewel, hagane – steel). Tamahagane is produced from iron sand, a source of iron ore, and mainly used to make samurai swords, such as the katana, and some tools. Diagram of a tatara and bellows
The Ohitayama Tatara Ironworks (大板山たたら製鉄遺跡, Ōitayama tatara seitetsu iseki) was a premodern steelworks for the production of tatara steel located in the Shibuki neighborhood of the town of Hagi, Yamaguchi Prefecture in the San'yō region of Japan. The site was designated a National Historic Site of Japan in 2012. [1]
The word tama means 'precious', and the word hagane means 'steel'. [1] Tamahagane is used to make Japanese swords, daggers, knives, and other kinds of tools. The carbon content of the majority of analyzed Japanese swords historically lies between a mass of 0.5–0.7%; however, the range extends up to 1.5%. [2] [3]
The $14.9 billion sale of iconic steelmaker US Steel to Japan’s Nippon Steel ends months of speculation over industry consolidation in a move criticized by union workers, but seen by one analyst ...
The lowest carbon steel is called hocho-tetsu, which is used for the shingane, (translated as “core-steel”) of the blade. The high carbon tamahagane and higher carbon steel, called nabe-gane, will then be forged in alternating layers, using very intricate methods to form the kawagane, (or, “skin steel”).
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An electric fan or a box bellow is used to feed air into the forge. The steel is usually one of the carbon knife steels Hitachi produces at Yasugi Specialty Steel. These are the unalloyed White steel (1, 2, 3) and the tungsten and chromium alloyed Blue steel (1, 2, Super), with White 2 the most common and Blue 2 the next most produced.