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    Looking for steel samples for composition analysis

    Hi All,

    Dunno where does this belong, so mods pls move to wherever it should be.

    Anyway, I have a chance to analyze steel compositions using very precise equipment, and the price that is reasonable (100$ per sample). Still rather steep, but a lot better compared to last quote which was 500$.

    The catch is that samples go into SEM vacuum chamber, so has to be a small piece. The only thing I have in a suitable size is a very small global knife, I am still curious about CHROMOVA 18 steel, even though it's most likely AUS6.
    Anyhow, I know it's a slim chance, but if anyone has pieces of steel few mm will do, from the alloys with unknown makup please contact me..

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    Why go this route when a spectrometer will suffice at a fraction of the cost?

    -AJ

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    I would say more precise on what alloys are in the make up.

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    There's no need for that extreme precision. Next time I am in MI or WI I plan on burning a few of my knives to see what they are. Will have to pick the monosteels of course. I am really curious on the Nenohi though I have heard they are clad. If they are, arc spectroscopy won't work.

    -AJ

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    Quote Originally Posted by ajhuff View Post
    Why go this route when a spectrometer will suffice at a fraction of the cost?-AJ
    For one, I can not find any lab in bay area which will do analysis on the knives at less than 500$.
    Two, I don't know how accurate the spectrometer will be. Week ago I got contacted by gentleman from UK who managed to analyze Mac Tungsten SS on spectrometer, it couldn't pick up any Tungsten in it, and I don't know the details but apparently the device was not set up to to detect Carbon at all...
    Anyhow, if someone knows a reliable lab in bay area, I am very open to suggestions I am reluctant about sending one of a kind knives back and forth to unknown testers, which is why I want local source...

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    We tend to do combustion for C and S as it is more accurate but spectrometer isn't too bad. True, you have to use a lab that analyzes steel to make sure they have the right channels on their spectro. But you don't need extreme precision. If your C measures 0.95 instead of 0.97, it's essentially the same thing. And measuring 0.9568 means nothing. Same as 0.95. Reach out to a local steel mill or steel foundry. They might be willing to help.

    -AJ

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    Do you have a list of such steels? What is the minimum sample size?

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    Carbonext would be interesting to know, as would Shigefusa's swedish

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    Quote Originally Posted by ajhuff View Post
    0.95 instead of 0.97, it's essentially the same thing. And measuring 0.9568 means nothing. Same as 0.95. Reach out to a local steel mill or steel foundry. They might be willing to help.
    Well, for Carbon that's true, for S and P it's better to have at least 3 digit precision, since the specs are that precise and "clean" alloys are valued based on that. As for the local mills, that's what I did 2 years ago, calledpretty much everyone around... You'd think in hi tech place like bay area it shouldn't be a problem, but apparently prices are also very bay area-ish... 500$ per sample was the best offer. until I found 100$.

    Quote Originally Posted by tk59 View Post
    Do you have a list of such steels? What is the minimum sample size?
    Not sure if you're asking me Any steel for which I don't have a data in the knife steel composition database will do. I have 3 that I want to evaluate, if I can, Global's CHROMOVA 18, Shigefusa Swedish and Mac SS Tungsten. I already have Aritsugu gokinko and TKS Special steel compositions, so those two are off the list. Carbonext is another one that comes to mind. And Kobayashi uses another mystery "cobalt stainless"... Sample sizes I was told few mm would suffice, considering it's SEM, I figure even 2mm piece will do.

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    You could always trim a bit off of the tang of a wa blade or punch a little piece from the tang of a western style knife.

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