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Thread: Kiyoshi Kato (Yoshiaki Fujiwara) hardness?

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    Kiyoshi Kato (Yoshiaki Fujiwara) hardness?

    Does anyone know the hardness of Kiyoshi Kato (Yoshiaki Fujiwara) knives made of Shirogami #2? I've got a 24 cm workhorse knife.

    Thanks!

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    not sure but it feels just as hard if not harder than a honyaki that I have. when you hit the surface of the knife with your finger nail it has a very unique vibrating pinging sound as well, almost sword like lol...

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    I measured the broken Tip, of my 240 Kato (non Workhorse, White 2 ), with very good test machine at a PM steel research center (DORST).

    Because of the small size of the sample it was not really accurate but at about HRC63.

    Greetings Sebastian.

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    Senior Member chinacats's Avatar
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    Quote Originally Posted by inzite View Post
    not sure but it feels just as hard if not harder than a honyaki that I have. when you hit the surface of the knife with your finger nail it has a very unique vibrating pinging sound as well, almost sword like lol...
    So does my high 50's Sab...
    once in a while you get shown the light, in the strangest of places if you look at it right

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    Quote Originally Posted by chinacats View Post
    So does my high 50's Sab...
    just saying but HRC63 sounds about right, maybe on the high side already.

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    Quote Originally Posted by chinacats View Post
    So does my high 50's Sab...
    And nearly any knife i own.... .... Just feel like, lets say yes a sword....

    Greets Sebastian.

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    Senior Member aboynamedsuita's Avatar
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    Quote Originally Posted by mark76 View Post
    Does anyone know the hardness of Kiyoshi Kato (Yoshiaki Fujiwara) knives made of Shirogami #2? I've got a 24 cm workhorse knife.

    Thanks!
    This is an interesting thread, but I thought that the workhorse was other than White#2 (some have thought Blue), and White#2 is used for the non-JNS kitchen knives?


    Quote Originally Posted by Sharpchef View Post
    I measured the broken Tip, of my 240 Kato (non Workhorse, White 2 ), with very good test machine at a PM steel research center (DORST).

    Because of the small size of the sample it was not really accurate but at about HRC63.

    Greetings Sebastian.
    This is also interesting because CK2G claims ~61 HRC for White#2 Kato, but your results augmented with anecdotal reports from KKF users and the reference to honyaki would definitely suggest higher. Here is the videos where they say ~61 HRC:



    This may warrant a new thread, but it'd also be interesting to know the differences between the "special" Katos (with different kanji) and the non-Workhorse versions we more commonly see (in terms of steel, HRC, etc.).

    I know Tosho had Blue yanagi (standard kanji), and these IG posts tagged #kiyoshikato have:
    Standard gyuto, special kanji, Blue steel - https://www.instagram.com/p/BP9gDYAlJRU/
    Damascus gyuto, special kanji, "old steel" - https://www.instagram.com/p/BPxgI3bFqfP/

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    I really want to know how hard are my knives


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    Senior Member khashy's Avatar
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    Quote Originally Posted by pkjames View Post
    I really want to know how hard are my knives


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    Yeah baby! Yeah!

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