Thursday, June 9, 2011

The "problem" with ZDP-189 and a short comparison to other steels

All of the reviews I had done thus far are from items that I own or have owned. Generally speaking I don't review a knife until it needs a sharpening. When I get them I usually run them through some cutting tests, like paper and shaving, but I also give them a quick swipe on the Sharpmaker. Then I let them live in my pocket for a few months doing normal EDC tasks with them. Finally, once they have lost their edge, I sit down with the Sharpmaker and bring them back. No second sharpening, no review.

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Well, ZDP-189 is presenting me with some problems. I have had my DF2 for a month now and I have used it almost exclusively and yet I can't tell any difference whatsoever in terms of is keen edge. I also didn't need to sharpen it when it came out of the box. So, I guess I will just have to wait. And wait. And wait. At this pace, the newest super steel will be released before my ZDP-189 blade dulls.

I can also report that it does excellent, even with its extremely high carbon content, with rust. It has been a damp couple of months here in New England and I can't find a speck of rust on the blade. It also is quite stain and tarnish resistant. I cut through an old pizza box and then didn't have a chance to wipe down the blade and the next day the grime came right off. Cardboard AND grease.

An early check on the steel tells me that it outpaces S30V by a noticeable amount in terms of edge holding. It is, thus far, just as stain resistant. I can't really find anything to complain about with the steel. It seems obvious to me, at least, that this is the new top of the heap. But you probably already knew that.

If I had to put them into tiers based on my three point scoring system (0=doesn't work; 1=works; 2=works well) with an eye towards edge holding, rust resistance, and durability (hardness v. toughness) it would be something like this (order in the tier from best to worst):

Top Tier (Score of 2)

ZDP-189
S30V

Middle Tier (Score of 1)

N690
VG-10
AUS8
154CM
440C
Kershaw's 8Cr13MoV

Bottom Tier (Score of 0)

Buck Heat Treated 420HC
Spyderco's 8Cr13MoV
Benchmade's 154CM

This is, of course, just my opinion, based on my own experience, but it seems pretty accurate with other people's experiences. For more on steels, see the link to Joe T's guide to the right.

11 comments:

  1. My new and beloved Dragonfly 2 in ZDP-189 steel. Found here:

    http://www.spyderco.com/catalog/details.php?product=633

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  2. so after a month of usage, does it still push paper and shave?

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  3. Well that's great with the concave grind it has when you get it of the box. Now try sharpening it. Everyone has the standard opinion from marketing. Try it out before you offer an opinion. Otherwise it i just smoke and mirrors.

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    1. Three years later I and I still love the steel. Sharpening is a chore, but if you strop the steel regularly its not a problem.

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  4. Thanks for coming back on the knife! I was interested in the particular steel.

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  5. Hows the steel doing in the tarnish department? Did ever consider the G10 DFly?

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  6. I have a spyderco delica 4 and have had it for many years, and there is very little rust and/or tarnish I agree with you very much on this as I use my knife daily

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  7. My Delica with the ZDP 189 Blade broke while I was cutting an apple. 1/4" inch of the tip broke right off, I could not believe it. Then I realized that ZDP 189 is made from powdered metal and is sintered so there is the possibility of a fault in the blade. I sent it back to Spyderco for warranty we will see what they say.

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  8. And Yesterday I got a letter offering me a discount of 45% on the list price of any Spyderco product if they can keep my Delica. Guess what guys I can do better than that from Amazon or any online retailer. Very disappointed in their response that it is NOT a warranty issue or a defect. I called them yesterday and politely let them know I was not satisfied, and the knife should not have broken so easily when being used as a cutting tool. I was told that today a higher level manager is supposed to call me back. We will see what the outcome is..

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