Friday, November 16, 2012

Types of Steel in Japanese Katana

By Jae Park


The 2nd facet of the samurai sword a person would probably have to look into is the kind of alloy applied to the cutting blade. Alloys applied in samurai katana change often, and every variety of alloy boasts unique components that impart specific properties on the cutting cutting blade. These differences in the craftsmanship and build of the alloy have a large impact on samurai sword effectiveness and strength, modifying almost everything from the heaviness of the sword to the blade's ability to maintain an sharp edge.

The particular type of alloy regularly used is carbon steel. Carbon steels can vary in hardness by about HRC 50-60, in accordance with the carbon and chromium content of the cutting cutting blade. Some common carbon steel grades you'll find when trying to find a katana are 1020, 1040, 1060, and 1095. The larger the number, the more carbon used (approximately 0.2% - 1.0%), the firmer the sharp edge is. The greater amount of carbon in the edge, the higher amount of resistance the sharp edge has to dulling and bending, rendering the edge more trustworthy in general. On the other hand, take into account that when the metal is tougher, the sharp edge also becomes a lot less impact resistant and less flexible, producing a samurai katana that is difficult to sharpen and cracks more easily.

If an individual is willing to spend over a 1000 dollars on a katana, a person may wish to think about a tough, sturdy material such as L6. L6 is a tool steel of outstanding strength; essentially, it's the material an individual will find in higher output industrial saws and jackhammers. A number of samurai sword suppliers offer production blades made from L6. It's good to be aware for martensite and bainite structures in the samurai katana; these kinds of crystalline components can be found in alloy as a direct result of very careful developing procedures and tend to be incredibly solid and tough, creating a reliable samurai katana.

Occasionally, one will encounter katana which are made with spring steel. In truth, this is another name for carbon alloy, even though several samurai katana suppliers make use of the phrase spring steel to denote some kinds of steel with greater chromium content in the material (similar to the alloy used in vehicle springs). A sort of this alloy I've noticed quite often is utilized in some Paul Chen Hanwei katana, specifically in their modern collection. They utilize 5160 high carbon spring steel in a few of their modern katana lines, creating swords which are generally more impact-resistant and sturdy than their 1060 counterparts. 5160 carbon metal swords can be reliable; however, this material is not often utilized in standard Japanese samurai sword. As a result, both the shine of the sharp edge and the excellence of the hamon look and feel unusual within these blades.

The most typical variety of metal witnessed in decreased caliber blades is 400, 420 or 440 stainless alloy which tend to have a high chromium content and lower carbon content. These types of blades are often shiny and often maintain fantastic design quality, but stainless alloy samurai sword shatter easily from usage and weren't made for any kind of reliable use. The substantial chromium content of stainless steel makes the sharp edge crack readily, which is not an extremely valuable attribute in a truly useful katana.




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