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2. Cold Steel (company) - Wikipedia

   en.wikipedia.org/wiki/Cold_Steel_(company)

   Cold Steel, Inc., is an American retailer of knives/bladed tools, training weapons, swords and other martial arts edged and blunt weapons.Founded in Ventura, California, the company is currently based in Irving, Texas, after an acquisition by GSM Outdoors in 2020. [1]

3. Japanese swordsmithing - Wikipedia

   en.wikipedia.org/wiki/Japanese_swordsmithing

   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.

4. Kabutowari - Wikipedia

   en.wikipedia.org/wiki/Kabutowari

   It would appear, according to Serge Mol, that tales of samurai breaking open a kabuto (helmet) are more folklore than anything else. [6] The hachi (helmet bowl) is the central component of a kabuto; it is made of triangular plates of steel or iron riveted together at the sides and at the top to a large, thick grommet of sorts (called a tehen-no-kanamono), and at the bottom to a metal strip ...

5. Differential heat treatment - Wikipedia

   en.wikipedia.org/wiki/Differential_heat_treatment

   Diagram of a cross section of a katana, showing the typical arrangement of the harder and softer zones. Differential hardening (also called differential quenching, selective quenching, selective hardening, or local hardening) is most commonly used in bladesmithing to increase the toughness of a blade while keeping very high hardness and strength at the edge.

6. Katana - Wikipedia

   en.wikipedia.org/wiki/Katana

   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]

7. Sword making - Wikipedia

   en.wikipedia.org/wiki/Sword_making

   In some techniques, notably the traditional folded steel blades of China, Korea, and Japan, the billet might be drawn, folded and welded back on itself creating layers of steel of different types. In others longer bars or rods of steel and iron might be welded together, edge to edge, to create the basic billet placing the softer iron inside ...