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Thread: San Mai v 01 for Coldsteel Kukri

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    New Member BrizbnBoy's Avatar
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    San Mai v 01 for Coldsteel Kukri

    Iíve noticed the Coldsteel Kukriís are now a fraction of the price but no longer made with San Mai steel.
    Does anyone know how the 01 Steel compares?
    I used to have a San Mai Kukri and it was amazing.

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    Urban Bunker Elder 1 wave man's Avatar
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    I have the CS LTC (Light Terrain Chopper) Kukri (carbon V steel) and used it in action extensively and have seen the Kukri san maiIII also in action and as you note they are amazing, and while I have never handled the O-1 version I couldn't see how they would be any different for all practical purposes performance wise.
    O-1 tool steel by all accounts is a great knife steel (oil hardened tool steel and capable of being hardened to high HRC, like HRC65, and if CS is running their Kukri's at HRC65 [I couldn't find what HRC they are apparently running them at] they would be a force to be reckoned with.
    wave man AKA Dean
    "I will never make excuses for who I am. It's the way I was born. I am a Hunter a Bone Collector."
    "A gun, like any source of power is a force for either good or evil, being neither in itself, but dependent upon those who possess it"

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    Knifemaker Tarrabah's Avatar
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    Quote Originally Posted by wave man View Post
    O-1 tool steel by all accounts is a great knife steel (oil hardened tool steel and capable of being hardened to high HRC, like HRC65, and if CS is running their Kukri's at HRC65 [I couldn't find what HRC they are apparently running them at] they would be a force to be reckoned with.
    O1 at 65Rc, all I can say is, make sure you get the destruction tests on video, Dean.

    The high Rockwell number is probably the "as quenched" hardness, it will come down depending on the steel size and use, with subsequent temperings.

    p.s. I will eventually get the CS Kukri in O1

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    Urban Bunker Elder 1 wave man's Avatar
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    Yeah I was going on this article (underline the important bit)

    https://www.hudsontoolsteel.com/technical-data/steelO1

    and it states
    O1 Tool Steel is the original oil-hardening, ďnon-shrinkingĒ tool steel that can be hardened to the Rockwell C 65 range from a low austenitizing temperature. O1 is a general-purpose tool steel that is typically used in applications where alloy steels cannot provide sufficient hardness, strength, and wear resistance.
    HRC65 is very, very hard, would be interesting to see if a knife maker could achieve such a high number and maintain ductility.

    Had to Google this 'Austenitizing Definition' Austenitizing heat treatment is heating a steel above the critical temperature, holding for a period of time long enough for transformation to occur. The material will be hardened if austenitizing is followed by quenching at a rate that is fast enough to transform the austenite into martensite.
    wave man AKA Dean
    "I will never make excuses for who I am. It's the way I was born. I am a Hunter a Bone Collector."
    "A gun, like any source of power is a force for either good or evil, being neither in itself, but dependent upon those who possess it"

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    Knifemaker Tarrabah's Avatar
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    Quote Originally Posted by wave man View Post
    HRC65 is very, very hard, would be interesting to see if a knife maker could achieve such a high number and maintain ductility.
    I don't think "achieve" is the right word, the hardness of a particular steel, will depend on what cool stuff it's made from, the thickness of the piece, the temperature it goes into the quench at, time at whatever temp, the temp, quenching medium, time in the quench, I think that's about it??...except for one thing that the books don't warn you about,

    Vanadium Fairies.

    If you are interested in HT as it relates to blades, Dean?, checkout the guru's writings heat treatment of sword, knife, dagger blades

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    Urban Bunker Elder 1 wave man's Avatar
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    thanks for that Scott, interesting read. I did note the hardening part for O-1 said this

    Hardening: Aus-tenitize at 1450 to 1500 įF (790 to 815 įC) for 10 to 30 min, then quench in oil. Quenched hardness, 63 to 65 HRC
    maybe run it at HRC63 just to be safe.
    wave man AKA Dean
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    "A gun, like any source of power is a force for either good or evil, being neither in itself, but dependent upon those who possess it"

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    Forum Supporter Timmy's Avatar
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    Would be interesting swinging it at 60+ rc, would it go pinnngggggg

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    Knifemaker Tarrabah's Avatar
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    Quote Originally Posted by wave man View Post
    thanks for that Scott, interesting read. I did note the hardening part for O-1 said this


    maybe run it at HRC63 just to be safe.
    Personally, if I had an O1 scalpel, I'd probably be looking at 60Rc and up?, I don't have enough experience with O1 to make the call, but any blade longer than a scalpel, would be lower on the scale, big blades, dunno' 58Rc?, tool steels are all very similar, each has it's own idiosyncrasy, depending on it's first letter designation.

    Quote Originally Posted by Timmy View Post
    Would be interesting swinging it at 60+ rc, would it go pinnngggggg
    It would be interesting watching somebody else, swing a high Rc blade, while I was safe behind cover, I reckon it might sound more like glass shattering at high numbers??
    Last edited by Tarrabah; 15-05-2019 at 19:52.

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    New Member BrizbnBoy's Avatar
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    Thanks guys - interesting reading.
    Iíll definitely buy one - at the price it seems a good gamble

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