68:"San mai" roughly translates as three flat things, in Japanese (San=three Mai=unit counter for flat objects). The term, and its root honsanmai, has been used to describe that construction method for many hundreds of years, from around 1300 A.D. It refers to when three layers of steel are used. The center is hard, and the sides are typically softer. As san mai is a generic term for a technique, the term can't be trademarked. Outside in the specific context of blade construction technique, the term, in general use in Japan, refers to three flat things (e.g. three tickets, or three pieces of paper), mai
95:"From the end of the Eastern Han to the Three Kingdoms period, the bailian gang (β100-fold refinedβ steel) technique was developed based on the chaogang technique. This technique involved repeated hot forging, folding, and stacking of chaogang bars in order to refine the crystals and inclusions. Steel with relatively low carbon content could sometimes be used as an ingredient to form composite steel. The number of laminations indicates the counts of lian (refining). The higher counts of lian, the higher number of forging cycles in the steel processing."
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In stainless versions, this technique offers a practical and visible advantage of a superb cutting edge of modern
Japanese knife steel, with a corrosion-resistant exterior. In professional Japanese kitchens, the edge is kept free of corrosion and knives are generally sharpened on a daily basis.
84:(many of which are preserved in Japanese museums) are made with this lamination technique of a harder steel core wrapped in a softer steel jacket. Jacketed lamination techniques, as well as repeated hammering and folding techniques, date to at least the ancient Chinese
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This technique of jacketed lamination (sandwiching a harder steel core between softer steel sheets) was a forging technique that dates back at least 2000 years to the kingdoms and empires of ancient China. The swords of the medieval
Chinese
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used for blade construction, commonly used on blades that have a symmetrical grind (i.e. the edges are ground down from both sides to expose the edge, which is composed of the inner core material. In Japan, traditionally the
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swords revealed that some swords had a layered structure, while others had a laminated structure. The more layered swords had more than 30 layers, while other swords had 10 layers.
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forming the blade's edge, and the iron/stainless forming a jacket on both sides. It is also the term used to refer to the technique used to create these blades.
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Morey J. "21st
Century San-Mai from Lightfoot Knives" Guns Magazine . 2009:86. Available from: General OneFile, Ipswich, MA. Accessed April 28, 2016.
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Carter, Murray "Bladesmithing with Murray Carter: Modern
Application of Traditional Techniques" Krause Publications, 22 September 2011
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Murray Carter "Bladesmithing with Murray Carter: Modern
Application of Traditional Techniques" Krause Publications, 22 Sep. 2011
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Corrosion can be avoided by keeping the exposed portion of the non-stainless portion of the blade clean and dry after each use.
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185:"Rediscovering Ancient China's Sword-Making Techniques: Insights from Reconstructing a Han-Dynasty Ring-Pommel Dao."
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Martial
Culture and Historical Martial Arts in Europe and Asia - A Multi-perspective View on Sword Culture
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242:" Side arm & nighthawk in 21st century San-Mai." (2008). American Handgunner, (196). 125.
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in the United States, often with new types of materials, including D2
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of 202 BC to 220 AD. Modern metallurgical and structural analysis of
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