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The pig iron contains more than 2% carbon. The high-carbon steel has about 1–1.5% carbon while the low-carbon iron contains about 0.2%. Steel that has a carbon content between the high and low carbon steel is called bu-kera, which is often re-smelted with the pig iron to make saga-hagane, containing roughly 0.7% carbon. Most of the ...
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 oldest katana in existence today is called Hishizukuri uchigatana, which was forged in the Nanbokuchō period, and was dedicated to Kasuga Shrine later. [1] The first use of katana as a word to describe a long sword that was different from a tachi, occurs as early as the Kamakura period. [13]
Blades whose length is next to a different classification type are described with a prefix 'O-' (for great) or 'Ko-' (for small), e.g. a Wakizashi with a length of 59 cm is called an O-wakizashi (almost a Katana) whereas a Katana of 61 cm is called a Ko-Katana (for small Katana; but note that a small accessory blade sometimes found in the ...
Often both folding directions are used to produce the desired grain pattern. This process, called the shita-kitae, is repeated from 8 to as many as 16 times. After 20 foldings, there is too much diffusion in the carbon content; the steel becomes almost homogeneous in this respect, and the act of folding no longer gives any benefit to the steel. [2]
(see image) [4] [18] kōgai (笄) – a skewer for the owner's hair-do, carried in a pocket of the scabbards of katana and wakizashi on the side opposite of the kozuka. [33] [34] kogatana (小刀) – any knife, particularly a small utility knife carried in a pocket of the scabbards of katana and wakizashi. ko-itame-hada (小板目肌) – see ...
The pommel often has a short decorative spike-like protrusion projecting from its centre. The blade is fashioned from flexible edged steel measuring 0.75 to 1 in (19 to 25 mm) in width. Ideally, the length of the blade should be the same as the wielder's armspan, usually between 4 and 5.5 ft (1.2 and 1.7 m).
a Japanese exotic, high-end steel made by Hitachi. The "Blue" refers to, not the color of the steel itself, but the color of the paper in which the raw steel comes wrapped. Aogami/Blue-Num-1 A steel with higher tensile strength and sharpening ability than blue-2. Aogami/Blue-Num-2 A steel with higher toughness and wear resistance than blue-1.