ZDP-189 Steel

For me, ZDP's ability to hold a thin sharp edge is preferred over VG-10. I must admit that I do not carry ZDP everyday right now, but I have in the past and it works very well.
 
THG said:
I would imagine the amazing edge holding ability and the excellent stainless-ness.
Click to expand...

ZDP will take an exceptionally fine edge, but the chromium carbides it forms aren't as hard wearing as the vanadium carbides found in S90V. Add in the CPM process for ultra fine grain and carbide size and you've got a bit better of a steel.
 
Josh K said:
ZDP will take an exceptionally fine edge, but the chromium carbides it forms aren't as hard wearing as the vanadium carbides found in S90V. Add in the CPM process for ultra fine grain and carbide size and you've got a bit better of a steel.
Click to expand...

CPM process to my knowledge uses 2 micron graines and for fine edge you need it to be ten times less then this. I did not tested it against CPM S90V yet, but ZDP189 shows better results then CPM 10V. So far only CPM M4 came closer. I think vanadium as well as Nb and Co carbides in CPM S110V wre too hard for fine edge.

So far Dozier D2 is on top and D2 has huge iron carbides - much bigger then any CPM steel and softer then vanadium...

I think Hitachi has some secret to make ZDP189 (and it is PM steel as well).

Thanks, Vassili.
 
nozh2002 said:
CPM process to my knowledge uses 2 micron graines and for fine edge you need it to be ten times less then this. I did not tested it against CPM S90V yet, but ZDP189 shows better results then CPM 10V. So far only CPM M4 came closer. I think vanadium as well as Nb and Co carbides in CPM S110V wre too hard for fine edge.

So far Dozier D2 is on top and D2 has huge iron carbides - much bigger then any CPM steel and softer then vanadium...

I think Hitachi has some secret to make ZDP189 (and it is PM steel as well).

Thanks, Vassili.
Click to expand...

It has to be at 0.2 micron for a "fine edge?" I get outstanding results from my 3 micron Spyderco UF ceramics.

Why is vanadium to hard for a fine edge? I thought you used diamond sharpening stones. Wouldn't that nullify any qualms about steel hardness? Wouldn't that cut the carbides?
 
Josh K said:
It has to be at 0.2 micron for a "fine edge?" I get outstanding results from my 3 micron Spyderco UF ceramics.

Why is vanadium to hard for a fine edge? I thought you used diamond sharpening stones. Wouldn't that nullify any qualms about steel hardness? Wouldn't that cut the carbides?
Click to expand...

I am talking about whittling hair kind of sharpness.

I am not sure is it too hard or not, I just see test result and start thinking that it may be a reason. Diamonds sharpen carbides - no problem, I can sharpen any steel (except CPM S110V) to whittle hair, but then ZDP189 and Dozier's D2 shows better test results then CPM 10V. So I may speculate that being too hard, vanadium carbides just fall out of edge while iron carbides deforms and stay. But this is just attempt to explain test results.

Regards, Vassili.
 
You must log in or register to reply here.
Back
Top