May I ask who have done the heat treat? Do you have details about the protocol used?
I don't. It was a special project of Nexus knife that was developed for Lionsteel. But the heat treat was so expensive that Lionsteel couldn't produce it and make a profit. I think about 70 were made. A few were sent to dealers, where the list price was $700.
Somewhere there's a video of Italians chopping rocks in half with this blade. I don't speak Italian, but they were clearly marveling over the lack of edge damage after chopping up rocks.
Here's what I do know:
This Centurione, 180 mm long blade thickness 7 mm has been developed by exploiting (but not limited to) the experience gained with the Caio.
For this reason, some very important construction choices have been made. The thickness in the wire zone was increased by 0.5 mm (0.7 to 1.2), the type of construction is always full tang but the end of the tangle has a different design to favor the reverse socket (useful though In a few cases), to be used to beat and to improve the detachability of the handle.
The latter is monolithic in Miso 1, a glass-based material such as G10, G11, Nema Fr 4 and Nema Fr5, but it has no problems with flaking (which is already very low for the materials mentioned) and is naturally more gripping .
Improved ergonomics, increasing the grip of the grip of the grip, eliminating the groin on the back (held by some, but not all, annoying and unhelpful) and removing the boss of the screws.
Compared to the Caio, the wider blade and the weight reduction of the end of the tails allowed to advance the center of gravity to improve the effectiveness of chopping.
The tip has been modified, rendering it more effective for any punching (even for wood carving).
The steel remained the modified A8, already used on Nexus Caio and Tito. Tempered at 59hrc. For the Centurion, however, more thermal treatments have been made to ensure even greater reliability.
Relaxation treatment performed after the various workings, before the hardening.
The latter, as with the other models, was made in vacuum ovens with forced-off (which, however, ensures a sufficient cooling rate to prevent the precipitation of chromium carbides K1 or K2).
Triple fracture (also in this case as for Nexus Caio and Titus) to exploit the precipitation of secondary carbides, transform all residual austenite into recovered martensites and have optimal eliminations of residual stresses.
The pieces have also been placed in the oven in such a way as to allow homogeneous heating for each specimen.
Particular mention should also be made of the prototype studies to observe the most stressed areas.
The traslation from google traslator, I'm not sure is really perfect...