zippidy doo da 189

Keep in mind ZDP 189 is not a "new" steel. It's been used for cutlery in Japan for nearly 20 years. It just has not been of interest or available in the US until recently.
 
Fours hours soaking in a 2 cup solution of 1 teaspoon table salt and 1 teaspoon of lemonjuice, no corrosion. Three hours soaking in the same solution provided by a wet paper towel wrap, induced four spots of orange rust, from 1-2 mm in diameter. A Paramilitary was used as a reference, it also had no rust after the first soak, and had 2-3 times as much corrosion after the second but was lighter in extent.

-Cliff
 
brownshoe said:
Kind of suprising that spyderco puts a steel in one of their knives w/o knowing its rust and stain properties. It appears they don't even know the rust/stain properties, much less have tested them.
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As just a "sprint" one-off type run, they probably didn't see the need to do the extensive testing they would if they were considering ZDP-189 as a regular production steel. Probably not worth the time and expense.
 
i can tell you that it is fiercely sharp. The sharpest knife I have ever handled so I hope the steel works out in to other areas
 
This steel's been around a few years, so there should be some test results. Spyderco should at least know the corrosion properties from the steel supplier's spec sheets. A quality manufacturer picks materials based upon design specs and tests those materials as needed (or has the supplier test it) to assure the material meets those specs.
 
brownshoe said:
A quality manufacturer picks materials based upon design specs and tests those materials as needed (or has the supplier test it) to assure the material meets those specs.
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Spyderco does this *far* more than most. Ask around and see how many makers/manufacturers can give you lock breaking points, q-fog tests, or have their own CATRA machine.

The problem I would have would be if they promoted the steel for properties they never evaluated
[*], in this case it was more of a gift to a subset of the market who are interested in new steels.

-Cliff

[*] which is really common in the industry at large.
 
It slices card stock and thus can measure one aspect of both inital sharpness and edge retention.

-Cliff
 
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