N690: Gain The Cobalt Edge | Steel Hunting Knife Review

One of the newest, most consistent steel knife blades gets put to the challenge on wild game!

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Various alloying elements (chromium, vanadium, phosphorous, manganese, molybdenum, nitrogen, etc.) used in blade steel, particularly in the family of corrosion-resistant “stainless,” produce certain desirable properties (edge retention, hardness, corrosion resistance, impact strength, etc.). One of the most exotic alloying elements is Cobalt, which is known to increase hardness and strength, as well as intensifying the effects of other elements in a particular steel formulation.

boker-savannah-4.gifAs an individual element, Cobalt is not found as a native metal. This element is usually found in the form of ore. As such, it is not mined alone but is produced as a byproduct of nickel and copper mining. There are many applications for Cobalt, including use in what can be termed “superalloys,” such as those used in gas turbine aircraft engines, high-speed steels and corrosion- and wear-resistant alloys. In blade steels, Cobalt is one of the components of ATS-55, CPM 125V, VG-10 and one of the very latest steel developments N690 (also known as N690Co and N690BO).

Adding Cobalt To The Mix
Bohler, an Austrian steel manufacturer, is the current source for N690. This firm is considered a worldwide leader in their production of rolled sheets and plates that offer superior uniformity. The chemical composition of N690 is as follows: carbon 1.07%, chromium 17%, cobalt 1.5%, manganese .40%, molybdenum 1.10%, silicon .40% and vanadium .10%. Typically, N690 is hardened to a factor of Rc 58-60. Obviously, the key here is the addition of cobalt in the steel matrix. The cobalt allows the creation of a very uniform structure within the steel. And when used in blade steel, this provides a fine and consistent edge, enhancing edge retention and sharpening receptivity.

In discussion with various knife makers who have had experience with N690, some liken it to a sophisticated 440C with better edge holding and stain resistance. Other makers regard the steel as somewhat similar to VG-10 and see little difference between the two. One comment that ran through all of my conversations was the fact that the steel is extremely fine grain. When it comes to edge holding, every maker agreed that the finer the steel grain the better.

Who’s Using N690
There are several production cutlery firms using N690 in their knife lines. Boker USA is offering a professional hunting and outdoor fixed-blade, designed by German maker Armin Stutz, in this new steel. Fox lists their USMC Predator fixed-blade, in camo and black, with both tanto and Bowie blade patterns in N690. The Ontario Knife Company offers their Retribution-1 folder with a liner-locking mechanism and linen Micarta handle scales in the steel. TOPS Knives has a couple of models in N690, including their COT Magnum 711 Tactical folder, featuring a tanto blade pattern and G10 handle scales. TOPS also provides this blade steel in their mid-size CQT Thunder Hawk folder that features a Teflon-coated, tanto pattern blade. And Spyderco utilizes N690 in their Jerry Hossom-designed line of large fixed-blade outdoor knives, including the Forester, Forager, Woodland and Dayhiker. The only thing limiting the use of N690 would be simple economics—material cost and availability. 

I had an opportunity to use a Boker Savannah fixed-blade, which features a full tang blade crafted from N690. This knife was designed in response to Armin Stutz’s hunting experiences in Africa. The drop-point pattern blade itself is impressive, measuring 5 inches in length and featuring an attractive two-tone finish. The Micarta handle scales are elaborately grooved in an alternating pattern to provide an enhanced grip surface. Stainless steel bolsters, with a red fiber underlay and a lanyard hole at the end of the handle, complete the package.

On two successive hunting trips for wild pigs, the knife was used for field dressing and skinning chores. I found that the edge-holding ability of N690 was superior to most stainless formulations, even when working around bone. After use, I touched up the edge with a diamond rod and discovered an uncommon uniformity to steel. It would seem that the addition of Cobalt to an already outstanding steel formulation provides that extra edge that all of us are looking for. 

For more information on the Savannah knife, contact: Boker USA, 303-462-0662, www.bokerusa.com.

Load Comments
  • Steffen

    Hi,

    Can anybody help me identifying a knife supposedly made from N690?
    It is shown on the large picture (with black handle)on the website:
    http://www.guloggratis.dk/sport/jagt-fiskeri/knive/annonce/9999082

    According to the writing on the blade it is made in Taiwan, from N690 steel.
    The name of the knife is written with some curvy letters on the blade. I think it says Jecas or Vecas or something but does not give any hits when searching for it.
    Has somebody seen this knife before?

    I is supposed to have costed approx. 250$ from new and offered for 150$ (incl. the small Mora knife) but I am a bit reluctant to buy…

  • Kelvin

    I see that Trevor Burger is using it on his Exskelibur folder too

  • John Steedman

    By April 2010 N690 will be available for sale in the US in the most popular blade thicknesses.

    When it arrives it will be promoted and advertised.

    This is a program which will feature 4 of the Bohler-Uddeholm stainless knife steels, 2 powder metal, N690 and a salt water corrosion resistant grade.

  • Dave

    SIGTAC’s “pterodactyl” is made of N690 as well.

  • jose tre

    recently purchased the tops thunder hawke , noticed it has the n690co steel with fox knives italy ground blade it is very comfortable tactical knife extra sharp and have had other knives like the emersons cqc7 cqc8 and others and i felt the sharpness of this knife is superior and more of a utilitarian edge also for survival situations or every day use

  • Adam

    Also SIGARMS/SIGTAC – “Pitbull” was made with n690 Cobalt Vanadium Steel coated with a MilSpec coating & G10 handle, & is one of the best knives I have ever owned. But due to cost issues, The Pitbull is now made with Aus6 as far as I know, & with a Teflon coating instead.

  • Oxidan

    Also EXTREMA RATIO uses N690.