New Sword 2
Experiment with sandwich style steel construction (Sam'mai style steel construction)

The core steel is folded 14 times from hard and dense steel pieces. It becomes the edge.

The outer steel is folded 9 times from some tamahagane ingots. The ingots looked milder than that for the core steel, but I didn't check the quality carefully. Because it is not for edge, so some tough steel is enough for the purpose.

The outer steel and the core steel are constructed to on steel block with the sandwich style. So the core steel becomes the edge. The weight of the core steel was 210g. I didn't know the weight of outer steel, since it was still connected with the forging handle.

The steel was drawn out roughly, and cut off from the handle. The weight of the steel bar is 1100g.


4 tanto blades are cut off from the steel bar. So they are sisters.

#1
(still before hardening work)


#2 (=> Project Gotoba)
Before tempering work


#3
Trying with Ayasugi layer pattern


Before tempering work


Trying a straight pattern hamon (suguha)
Just after quenching


Polished out by the classical style (Sashikomi style polishing)

blade length 21.8cm, thickness at the base 7mm, width 2.5cm

The steel layer is a compact Ayasugi pattern.



Hamon is a straight pattern made of small particles (ko-nie), and it is bright. Some kinsuji appears as an ayasugi pattern.


#4

Before tempering work


Trying a crazy pattern hamon
Just after quenching


It is polished out by the modern style polishing (Hadori polishing). But the Hadori work is not very strong. Any acid are not used.


The steel layer looks coarser than that of the sister #3.



Hamon is an active pattern made of large particles (nie). Some kinsuji also appears.


 

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