OK. I left a comment on the article. It is "waiting moderation", so you won't be seeing it where I posted...
But I saved a copy for your enjoyment/irritation.
I hope this doesn't violate site policy for negativity, these knives are certain to be OK if the OP liked his.
But this writer wasn't quite as sharp as the knives.
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Thiers, France is " the world capital of knife making"? Are you certain about that?
Thiers certainly has some good knife makers. So does Seki city in Japan (a lot more knife makers in Seki than in Thiers these days, actually). And so does Solingen, Germany (again, numbers in Solingen are looking a bit higher than Thiers). Toledo, Spain. Sheffield, UK.
I could mention cities in Sweden, Switzerland and Czech Republic with good numbers as well. And closer to home, even your native Pittsburg PA has several. Don't forget the people over by Franklinville NY either. The list goes on. Not quite sure Thiers is the world capital? Maybe define your parameters???
I would guess that those knives might get a cryogenic liquid Nitrogen treatment AFTER forging- And probably after some post forge rough grinding to shape/size + a hardening heat treatment/quench cycle, not BEFORE forging. Because doing it before hand would be a waste of manufacturer's time and liquid Nitrogen.
Also, liquid Nitrogen quenching is about -196 C or -320.4 F., RATHER chillier than -54 F, which is not even as cold as dry ice.
Maybe that was just a translation error, French is so confusing and French people just INSIST on using Centigrade/SI units/metric system, almost like they invented that stuff or something. Oh WAIT. They DID?!
58-60 on the Rockwell C scaleisn't terribly soft, it's nearly as hard as a good Japanese knife, mine run 61 to 65 depending on maker & use. Somewhat harder than tradtitional, easy to sharpen German (and French) knives, commonly around 54-58.
Say, that knife STEEL was SOURCED in France. The factory is where, again?Thiers, in France??? Because I just read a January 2019 article where the two brand owners very clearly state that everything they sell is "made in the USA".
https://allamericanreviews.com/made-in-cookware/
I am SO confused by all this!