Toughness is very important for long swords. spring steel samurai sword can only be about 80J (when the hardness is 57hrc), such as ASTM9260.
This one does not use clay tempered quenching craftsmanship. Its quenching craftsmanship is ‘vacuum heat treatment’. So its hamon is fake, in order to make it more beautiful. And the blade is not black-plated, the color comes from the steel itself.
The advantage of modern high-performance materials is that they are more durable and have better sharpness retention. When test chopping, it is best to cut only bamboo and mats, because bamboo and mats will not let the blade get V-shaped notches. Once these overall quenched high-performance materials have V-shaped notches, the probability of breaking will be very high.
The tsuka is handmade and can be quickly disassembled while fitting perfectly with the Nakago. The nakago doesn’t wobble in the tsuka. Ito and Sageo are imported from Japan. Ito is cotton and Sageo is rayon. Ito is lined with Hishigami,which makes it very plump and tight. Moreover, the blade is made of high-performance steel, which is very suitable for trial cutting. Overall it’s light and smooth, making it an indispensable katana for practice.
We keep the steel secret because we don’t want to cause other companies to follow suit with fake materials. There are many fake materials on the market now.
Following data are provided by the third-party testing institution.