What is infi?

Discussion in 'Busse Combat Knives' started by WombSlider, Jul 30, 2007.

  1. WombSlider


    Jan 15, 2002
    I assume that infi is a modified version of a better known steel. A2 would be my guess. Does make it themselves somehow or do they contract with a steel mill that makes them they're own alloy?

    Not trying to uncover trade secrets here just curious how a relatively small knife company can have their own steel without simply renaming another one i.e. Carbon V.
  2. Jos


    Oct 23, 2006
    Use the search function and take a few hours to read all the info...

    Oh, and one thing is for sure... INFI is addictive. :D
  3. barrabas74


    Jul 27, 2005
    INFI is a proprietary steel and heat-treat protocol developed by Busse Combat Knife Co. It is ONLY available through Busse Combat.

    Some facts and info about INFI.

    Although hardened INFI knives are 58-60 Rc we have yet been able to chip an edge. The edge can be dented or misaligned but its high level of malleability at such high hardness has never been duplicated by any other steel that we are aware of or have tested.

    In one of our performance tests, we bend a Battle Mistress 35 degrees in a vise and it springs back to true. Why would we do this? What does it prove? What is the benefit to the customer? Not only does this test demonstrate the enormous toughness and lateral strength of an INFI blade but, because our hardness is homogenous and not differential, it demonstrates the amount of lateral strength and "spring" of INFI all the way to the edge. That means that edge of the blade will possess this same toughness. INFI is the only knife steel ever tested that has achieved such high levels of lateral strength with a homogenous hardness of 58 - 60 Rc. No other steel has even neared this performance level.

    Edge Retention
    Many so-called knife experts have heralded the "wear resistance" of a steel as the key to edge retention. This may very well be true if a knife is designed and intended for the cutting of soft materials ONLY. However, we have never inspected a dull knife and found the edge to be perfectly smoothed away, like a ball bearing. Instead what we find are microscopic chips where the edge has broken or chipped away like glass after having impacted against bone, gravel, or other hard surfaces. This micro chipping dictates that the edge be reground during the resharpening process, which will ultimately lead to a thicker edge and a radical change in overall blade shape. Steels with high wear resistance normally score fairly low in shock resistance, lateral strength, and overall toughness. INFI scores very high in ALL of these categories.

    INFI's high level of chip resistance also makes it the easiest steel to resharpen by hand that we have ever encountered. I personally fall into the category of "hand sharpening challenged". I've heard tales of those who can sharpen ball peen hammers to a razor's edge on an Arkansas stone in less than 5 seconds flat. My experiences have always been to the contrary. The spine of the knife is usually sharper than the edge when I'm finished applying my magic stone sharpening technique. One of the great features of INFI is that simply stropping away from the edge (the way a barber strops a straight edged razor) on a ceramic stick is basically all that is required to resharpen INFI. Since you're not chipping steel off the edge there is no need to grind any steel away. This feature of INFI will, likewise, allow you to keep the same overall profile of the knife for a much greater period of time.

    How does INFI compare to other steels?
    Simple question, complex answer. INFI represents what I have always dreamed of in a knife steel. Tougher, by an enormous margin, than any other steel I've ever tested. Unparalleled edge holding under high impact and in cutting tests. Shock resistance that begs you to "bring it on". An ease of re-sharpening that you have to see to believe and higher levels of lateral strength at high hardness than have ever been achieved by any other steel. We have published our test results and our testing methodology. We have video taped all of these tests and play the video at the knife shows we attend. More importantly, we have duplicated these performance tests in "LIVE" demonstrations at many trade shows throughout the United States. We encourage all manufacturers to put their products through our tests and to publish their results. If you want to know how another maker's knife will compare to a Busse Combat knife, ask the other maker to duplicate our tests in a "live" demo.

    Is INFI stainless?
    Not supposed to be. However, INFI has demonstrated very high levels of stain resistance in many different climates. Uncoated blades have been tested for years in Alaska and have made their way into the wilds of British Columbia, the High Sierras and tropical rain forests. No rust in Alaska or British Columbia! No rust in the High Sierras, even when exposed to great quantities of blood and left in the wet grass overnight. The tropical rain forest, which has been known to rust plastic (just kidding), did offer the toughest of the environmental exposures and a light speckling of surface oxidation did occur but was easily removed in the field with a hand rubbing of sand and water. No deep pitting was reported. When compared to other cutlery steels in salt spray tests, INFI faired better than ATS-34 and D-2. Although all three grades exhibited surface oxidation, the INFI was not deeply pitted as was common in these other two grades. So, although INFI is not technically a stainless steel, it is certainly not a rust aggressive steel. Couple this with a minimal amount of care and you've got a fairly maintenance free knife.

    With a steel like INFI it's easy to understand why we offer the toughest guarantee in the business. We guarantee against any and all unintentional MAJOR damage forever.

    Jerry Busse

    :D :D :D :thumbup:, like JOS says its addictive....and the only thing that might OD is your Credit Card:thumbup:


    Mar 16, 2005
    i wish i could kick INFI............NOT!!! lol
  5. resinguy


    Feb 19, 2006
    If you search long enough, you will find a thread that contains the metallurgy, sorry, I don't have it. It's not A2. So the composition is known. We (the general buying public) do not know if it is a custom blend from a mill, or a variant of a commercial steel (as some have speculated). But the key to the development of the ultimate properties is the extensive heat treat protocol that Busse does in house. The combination of the composition and the HT is what makes it INFI. It also makes it expensive. By selling direct, and avoiding the standard dealer mark-up, Busse is able to offer what they believe is simply the flat out best knife one can have, and keep the price reasonable.
  6. leatherman

    leatherman leathermoderator Moderator Knifemaker / Craftsman / Service Provider

    Nov 30, 2001
    Welcome back WombSlider! I seem to remember you from somewhere, like a face in the room that just looks familiar and I just cant place it........
  7. Bravado


    Feb 14, 2002

    Yeah that name does ring a bell.
  8. WombSlider


    Jan 15, 2002
    Yeah I read a lot but don't post too often. I've always loved Busse, in fact I was one of the very first to purchase a 1st generation SH Battle Mistress. Wish I had kept it now.
  9. mister_wilburn


    May 23, 2006
    Where did the Name "Infi" originate? Does anyone know the story behind the name??


    Oct 29, 2005
    infi is why i work so much overtime.

    infi is why i need to get a raise.

    infi makes me smile.

    infi is the reason i get to talk to amy.

    infi is in my car.

    infi is on my wall.

    infi is in my safe.

    infi is on my belt.

    infi is only ONE reason busse combat is the best.
  11. Guyon

    Guyon Biscuit Whisperer Staff Member Super Mod

    Mar 15, 2000
    INFI is sort of like giving your credit card to someone and saying, "Sky's the limit!"

    Does that help?
  12. leatherman

    leatherman leathermoderator Moderator Knifemaker / Craftsman / Service Provider

    Nov 30, 2001
    Just rang another bell for me, something about a retarded talon hole? :confused:
  13. Guyon

    Guyon Biscuit Whisperer Staff Member Super Mod

    Mar 15, 2000
    Well heck, there's no reason to beat around the bush...

    I'm not sure why a hole, when trademarked and placed in a particular spot on the knife time and again, is any different from a trademarked blade shape or handle design. If a hole is not "original," I wonder if that means folks ought to be able to copy Spyderco's hole as well.

    The formula for INFI is no great secret. It's posted here on BF if folks want to search for it. Of course, the heat treatment is not described in any detail, and INFI steel is the amalgamation of both a formula and a heat treat. It's definitely not A2.
  14. leatherman

    leatherman leathermoderator Moderator Knifemaker / Craftsman / Service Provider

    Nov 30, 2001
    Heck, I'm working off a contact cement addled memory here, gimmie a break. :eek: :p

    oh yea, theres like a search function huh? I forgot all about that.:cool:

    I still like "retarded talon hole", sounds like a marketable commmodity to me. :) "Does the AD have the special RTH?" "Why yes! It does!" :D

    I think I have an old Steel Heart with RTH, or was that a Badger?
  15. leatherman

    leatherman leathermoderator Moderator Knifemaker / Craftsman / Service Provider

    Nov 30, 2001
    Spyderco and Benchmade had quite a fuss over thier holes didnt they?

    oh man, I can see this thread going all to pieces.......... :eek:
  16. zenheretic

    zenheretic Platinum Member Platinum Member

    Oct 29, 2005
    IMO as Spyderfanatic, I think it is a different issue. The SpyderBench issue was muddy due to an undisclosed agreement. The only people that know the details of that agreement wear Butterfly or Spyderbug undies.

    What I learned from all that muss was if you have a trademark you better defend it, if you don't defend you lose it...and it is real expensive to defend against a whole pack of imitators.

    I also learned to just ignore people disputing trademarks on the internet. It really isn't worth your time, and does drag down an entire subforum.

    Best to drink and kill wood, Infi style.
  17. leatherman

    leatherman leathermoderator Moderator Knifemaker / Craftsman / Service Provider

    Nov 30, 2001
    Where can I find said Spyderbug undies? I feel the need! :D
  18. Ironballs


    Nov 18, 2006
    about $100 per custom inch...
  19. Guyon

    Guyon Biscuit Whisperer Staff Member Super Mod

    Mar 15, 2000
    For Spyderco underwear? Or for the fake package built into the underwear? :confused: :p
  20. leatherman

    leatherman leathermoderator Moderator Knifemaker / Craftsman / Service Provider

    Nov 30, 2001
    uh yea, what he said. :eek: :eek: :eek:

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