noriaA7X

The Katana is a Japanese sword that was used by the samurai in Japan. Curved, slender, single-edged blade with a circular or squared guard and a long grip to accommodate two hands are the characteristics of a katana.

This sword has been in my field of obsession for the past few days and primary reason for that is this truly remarkable fact:

It can slice a moving bullet in half

                                               Source Video

Its not often that you find a bullet’s reputation of being rigid taking a hit.

But I am not here to deceive, the above is in reality a Katana slicing a bullet in half.

What makes it so strong?

Its strength is attributed to its extensive manufacturing procedure. And for very good reasons, the legit ones cost thousands of dollars.( and antique ones, will ensure a hole in your pocket )

Here’s how a katana is crafted:

Iron-sand is a type of sand that has high concentrations of Iron ( -_- ) and since its contains magnetite, it is also magnetic is nature.

                                           Source

This Iron sand is heated in a conventional furnace to 1400 C and maintained at that temperature for three whole days ! This is done in order to even out the carbon content in the steel.

Eventually a lump of iron known as tamahagane emerges on immersing it in water.

                                                Source

The best ones are chosen, pounded flat and arranged in stacks. Depending on the style of the Katana, different layers of soft, medium and hard steel are used.

The resultant material is heated again and flattened out.

This process : Bending, hammering, layering and repeat , is carried out several times.

A long block of steel emerges from this procedural, which is only slightly curved. To impart the curvature and also strengthen the sword even more, a wet clay coating is applied.

                                                Source

The edge of the blade is coated with a thinner layer than the sides and spine of the sword. This causes only the blade’s edge to be hardened and also causes the blade to curve due to the difference in densities of the micro-structures in the steel.

The coated sword is heated and then quenched in water ( immersed immediately in water / rapid cooling ).

Now the sword has the endurance and the strength, it is time to polish the katana. Polishing is an art by itself and requires the most skilled smiths. The process of polishing takes between one and three weeks.

The polisher uses finer and finer grains of polishing stones in a process called glazing, until the blade has a mirror finish. 

A Katana emerges out of the procedural, having faced the hammering and the heat - strong, sturdy and powerful.

And it is this remarkable man-made masterpiece that has the potency to slice through a bullet.

The Philosophy

Japan considering its cultural and philosophical background does not consider the sword merely to be a weapon but also as an art-craft. The Sword, per se is only to be drawn for protection and uphold justice.

the Vortex at the centre generated by surrounding fans causes this light fabric to dance.