Myoushu
Jean-Jose Tritz 243x63mm UHC sanmai clad damascus gyuto with desert ironwood burl handle and unknown wood saya.
The Ultra High Carbon (UHC) core is made of TWR/1.2513+ 145SC and very thin strips 75ni8.
TWR/1.2513/135WCrV4 is a vintage steel once produced in small quantities for the former GDR/DDR
C: 1.4%, Cr: 0.4%, W: 1.1%, V: 0.2%, Si: 0.4%
C145SC
C: 1.45%, Mn: 0.3%, Cu: 0.03%
75Ni8 is a simple nickel steel
C: 0.7%, Ni: 2%
This core steel is firewelded with about 200 layers. As the two main steel have an average content of 1.4% carbon, the resulting damascus material can be called ultra high carbon without exaggeration.
The jacket is a composition of two different damascus with different carbon contents.
DDB damascus is composed by soft pure iron (butteriron), 1.2002 file steel with 1.2% C, and 75Ni8 nickelsteel.
DDB1 damascus is contains S700 construction steel with low C content but 2% Mn, and 75Ni8 nickelsteel.
Both parts were firewelded and forged out separately then restacked and mixed with filesteel and nickelsteel to build up volume and develop the desired effects. The jacket has about 120 layers.
After jacket and core damascus materials wer calibrated to each other, they were combined into a 3 layered block with the UHC damascus inside. Then firewelded at the lowest possible temperature folowed by careful outforging at a specific temperature to avid delamination and enhance the grain size of the edge.
Finally the blade is forged out with a handheld hammer. The thickness after surface manipulation was kept under 0.5mm variation to ensure the best chatoyance and also to keep the core/edge in the middle. After great care with heat treatment, the blade was worked with whetstones followed by handsanding and etching.
This blade was begun in August 2020 and finished in November 2020
Blade dimensions
Edge length: 243mm
Blade width at the heel: 63mm
Blade thickness at the handle: 4,2mm
50mm away from the tip: 1mm.
Weight: 248 grams
Geometry: convex
Balance at pinch point
This blade is a dream. JJT says that "This is my best blade for 2020 in this price class." A very expensive piece but exquisite. The blade has lot of chatoyance mixed within the different types of damascus. The desert ironwood burl also has a lot of chatoyance. Thus the saya was chosen to be more plain to give it more balance. As the original owner of such a highend knife, I have naming rights to the blade. So I have decided to find a fitting name and will call it "Myoushu".
There are two interpretations of this Japanese Term.
妙手 is a Japanese term from the game of go for a splendid brilliant move.
妙趣 is a Japanese term for exquisite beauty or charm.