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Semi stainless steel question?

Discussion in 'General Knife Discussion' started by AshesFall, Feb 19, 2020.

  1. AshesFall

    AshesFall

    159
    Jul 16, 2019
    Just out of random curiosity.

    Exactly how many semi stainless steels are out there?

    I can only think of D2 and 3V off the top of my head.
     
  2. ace

    ace Gold Member Gold Member

    246
    May 3, 2000
    There is no definition for semi stainless so hard to say.

    Zwear/PD1/CruWear would be in the same class as 3V. A8mod, etc.

    Some consider A8, A2, M4, etc semi stainless too.

    Then there is ZDP-189 that is not truly stainless, or XHP, but then there is no real definition for stainless either, so bottom line, hard to say.
     
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  3. madcap_magician

    madcap_magician Gold Member Gold Member

    Feb 27, 2005
    I believe there is fairly broad agreement that stainless steel is about +11% chromium and <1.2% carbon by alloy mass. I say 'fairly' because I've also seen 12% chromium and 13% chromium, and definitions that disregard carbon percentage.

    Of course that's not to say that those steels are automatically more resistant to oxidation than steels that do not meet that definition, as if I recall correctly a stainless blade that has been heat treated such that much of the chromium has formed carbides will be less stain resistant, since free chromium in solution is what contributes to the stain resistance.
     
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  4. ace

    ace Gold Member Gold Member

    246
    May 3, 2000
    Right, that's where it is at, in general. Agree on the broad agreement of 12-13%, but not a definition and bunch that seem to meet this requirement and not be stainless in the broad understanding of stainless, ZDP-189 for example. Semi stainless is even harder, not even a broad agreement of what that is. Something between stainless and non-stainless. So let's say less stainless than 440A (considered stainless by most I assume) and more corrosion resistant than 1095 (considered non-stainless by most). Is A2 semi? Is M4? Do you have to get to the level of 3V or Z-wear?
     
  5. tiguy7

    tiguy7 Gold Member Gold Member

    Jun 25, 2008
    I have some laminated blades with 420 bread and ZDP-189 bologna. The bread rusts more than the bologna in my experience. 420 is supposed to be highly resistant to corrosion. D-2 turns to red dust in my pocket in the summer.
     
  6. Sharp & Fiery

    Sharp & Fiery Always Embellish Knifemaker / Craftsman / Service Provider

    May 14, 2012
    I would throw Sleipner in the semi-stainless as well.
     

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