zippidy doo da 189

All I know is that it has 20% chromium, whereas most premium stainless steels (154CM, ATS-34, VG-10, or S30V) have around 14% chromium. I assume that this gives it better stain resistance, but I really don't know. The composition of ZDP-189 is very different in many respects, and I don't know what all those differences add up to. All I can say is that my ZDP-189 Calypso Jr doesn't show any signs of rust (on either part) and that it's the sharpest knife I've ever had.
 
but it also has 3% carbon if i remember right so much of the chromium could be tied up in carbides. i guess there is other peolpe on the boards here that knows alot more, it could be dependant on the heat treat also
 
Most wud be laminated in 420j2 or even 410 ss, cheeper and bonds easier to each other. Easier to stamp out as the sandwich is much softer than core.
 
Hi Paul,

We haven't done any Q-Fog testing on ZDP so I have no real info or comparisons. I'm no metalurgist, but logic says there should be enough chromium to keep it pretty clean, but as mentioned much of that Ch will be eaten up (joined to form Chrome carbides) by the carbon.

As also mentioned, the sandwich material of the laminate may be more prone to corrosion, such as the ATS.

I'd like to hear more from those carrying and using the ZDP Caly jr. about their expeience with corrosion.

sal
 
I'm no metalurgist, but 20% crome and 3% carbon sounds pretty funky. I'l be very interested to hear more about this steel!
 
I work for a water treatment co. so I'm around wet stuff all the time. I don't have any problems with 189 and working in water. :thumbup:

**Sal, I really like to EDC a Lum Chinese in ZDP-189! (hint, hint)
 
kevtan said:
Most wud be laminated in 420j2 or even 410 ss, cheeper and bonds easier to each other. Easier to stamp out as the sandwich is much softer than core.
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False. Absolutely wrong. ZDP189 is laminated to ATS 34 because of their similar heat treat specs.
 
a bit OT but still. can chromium somehow be substituted for another alloying element to get stain resistance? if yes what would work (and in what concentrations), i was thinking tungsten or cobalt or nickel or all of them. will those steels become very expensive? maybe it isnt even possible to produce them
 
Sal Glesser said:
...
I'd like to hear more from those carrying and using the ZDP Caly jr. about their expeience with corrosion.

sal
Click to expand...

I've had mine for a month and there are some orange specks. They are only on the toothy spydie edge bevel, nothing on the smooth surfaces.

You have to look _really_ close to see them. A couple swipes on the sharpmaker would clean it, but it's still so sharp, I haven't bothered.

Actually I haven't carried it for a week, so it would probably get cleaned off by cutting something also...
 
the purple caly jr is stamped zdp189/420J2 and its scary sharp. buy some band aids on the way home from the knife store youre gonna need em!!!
 
ERdept said:
I don't see any other mfg. using this in a folder.
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William Henry. Other than that I'm not aware of any. Of course if ZDP-189 becomes very successful, other manufacturers will follow.
 
The core of zdp is like a piece of red cardboard sandwiched by orange cardboard top and bottom

----------------------------
420j
----------------------------
zdp189
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420j
----------------------------
 
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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