I'd love to get a hold of this steel for my custom work.
My heat treatment and Geometry would do wonders with this material.
Borrowed my friends Sukenari 210mm gyuto. Out of box Geometry is fairly thick. Needed to drop the edge angles super low with that spine barely lifted off the stone.
Sukenari advertises the hardness at 67rc so it's got plenty of strength for low angle radius apex geometry.
Spyderco doesn't run zdp189 this hard. I reprofiled with 600grit vitrified CBN and I finished this edge at 800 grit Naniwa Resin diamond and a 1um diamond Strop.
Give the carbide volume I felt I needed bonded CBN/diamond to shape the apex even though the Chromium carbide can be shaped with softer abrasive,I felt that the combination of hardness and volume would see benifits with diamond/CBN. I feel the edge came up crisper with these abrasives and doesn't smooth out as fast.
I have to note that I'm talking about bonded stones not coated stuff like DMT.
The edge has nice aggression yet also very refined and crispy.
I like that it is faster to shape the apex than Vanadium rich steels and the high Hardness matrix.
Stain resistance takes a nose dive however. That's also what allows it to be so hard so it's a trade off.
Definitely a nice sweet spot between high wear, hardness and sharpenablity.
I'm not sure if I'd ever go past 800-1000 grit on this steel, I feel it's best to have some teeth exposing more Carbides at the apex but those teeth need to be refined.
From my experience at the moment 3k would be as far as I would go
The key here is low edge angles.
Application is kitchen, hunters, light utility, EDC.
Not for bushcraft, survival.