C = core steel, O = outer steelCore steel is hard, of course. So it is sensitive against the quenching work. However, outer steel is softer, and it is not very sensitive against the quenching work.
New sword 9
A blade with the three-layer steel construction
C = core steel, O = outer steel
Core steel is hard, of course. So it is sensitive against the quenching
work. However, outer steel is softer, and it is not very sensitive against
the quenching work.
- Start forging -
Fold'n welding work for the outer steel - Rough formed steel pieces are
picked up. Each of the pieces are formed with uneven quality in itself.
Some parts are hard, and other parts are soft. Some parts are rough and
other parts are dense. They are rather soft comparing with the core (edge)
steel.
And then, the steel pieces are welded together to one block, and forged
out after 8 times folding.
Generally, less folding tends to have rough layer, and more folding tends
to compact layer.
Forging the core steel - Hard and dense steel pieces are picked up. And
go to the fold'n welding work.
On the work of 7th folding
The core steel is forged out after 14 times folding. I hope the steel is
hard and dense enough to become the edge.
Construction is the sandwich style (three-layer style). The core and outer
steels are welded together to one block.
Then, the steel block is drawn out to a bar.
Cut several logs from the bar. They are sisters.
One of the sisters => New sword7 tanto blade with Ayasugi layer pattern
Clay work for the hardening work. This time the smith tries Hasebe style.
Just after the quenching work
On the half way of Binsui stage
It is polished with simple way (hazuya finish). So you can study the real
face of the blade.
Blade length 18.0cm, thickness at the base 6mm, width 2.7cm
In the sketch below, the red line suggests the border between the core
steel (= edge steel) and the outer steel. So, as you see on the sketch,
the construction work is not very symmetry. But you can study the difference
of the steel texture and a mechanism of Kinsuji appearing. Temper line
in the core steel is bright, while that in the outer steel is not so.
Habaki is made of silver.
Sirasaya and bag
120,000.yen
If you would like, we can re-polish it for free with either styles, the
modern style or the classical style.