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LC200N [58] (aka Z-FiNit, Cronidur30, N360) produced by Zapp Precision Metals, is a high nitrogen alloyed tool steel which exhibits superior corrosion resistance combined with high toughness even at hardness up to 60 HRc. Spyderco uses this steel in several of their knives.
Visual glossary of Japanese sword terms. Japanese swordsmithing is the labour-intensive bladesmithing process developed in Japan beginning in the sixth century for forging traditionally made bladed weapons [1] [2] including katana, wakizashi, tantō, yari, naginata, nagamaki, tachi, nodachi, ōdachi, kodachi, and ya.
Quenching hardens the metal so it holds an edge longer but this also makes it very brittle. To restore some ductility and durability the sword is tempered. With swords, due to their length, the challenge is greater as in a typical quenching it is possible to bend or warp the blade if it is not introduced to the quenchant smoothly and evenly.
The word katana first appears in Japanese in the Nihon Shoki of 720. The term is a compound of kata ("one side, one-sided") + na ("blade"), [6] [7] [8] in contrast to the double-sided tsurugi. The katana belongs to the nihontō family of swords, and is distinguished by a blade length (nagasa) of more than 2 shaku, approximately 60 cm (24 in). [9]
The origin of the name "Damascus Steel" is contentious. Islamic scholars al-Kindi (full name Abu Ya'qub ibn Ishaq al-Kindi, circa 800 CE – 873 CE) and al-Biruni (full name Abu al-Rayhan Muhammad ibn Ahmad al-Biruni, circa 973 CE – 1048 CE) both wrote about swords and steel made for swords, based on their surface appearance, geographical location of production or forging, or the name of the ...
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 itame-hada. [35]
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. One of the few remaining tatara is the Nittoho tatara in Shimane Prefecture, Japan.
The process of making tamahagane continues for 36–72 hours (a day and a half to three days), depending on how many people work and how much metal is to be obtained. Within an hour of smelting, the iron sand sinks to the bottom, called the bed of fire, in which it will be assessed by color to determine which parts of the smelt will be combined ...