Novi superčelik
Posted: 12 Nov 2008, 23:16
Do sada su kraljevi čelika bili S30V i San Mai III laminirani čelici (toliko hvaljeni od CS-a) te VG-10 čelici.
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ZDP-189
ZDP-189 is a powder metallurgy stainless steel made by Hitachi Metals of Japan. The actual composition of the steel is unkown publically as Hitachi has described it as 3C20CrMoW, thus the molybdenum and tungsten amounts are unknown. Cowry X is a similar steel made by the Daido Corporation which also has the same carbon and chroimum content but also contains 0.3% vanadium and 1% molybdenum so ZDP-189 may have similar amounts of molybdenum and tungsten raplacing the vanadium as those two have similar effects. While the large amount of primary carbides would seem to suggest issues with sharpness the only problems reported are with sharpening on ceramic rods which can in general cause issues with high hardness steels. In general feedback from user on sharpeness and sharpness is high. Materials data on ZDP-189 :
* Hitachi materials information on ZDP-189 (translated)
* additional hitachi information
* a fairly vague composition reference from Hitaci
* CATRA results for 440C, VG-10, S30V, S90V, ZDP189, S125V from Spyderco
Promotional material from makers/manufacturers :
* The ferrari of blade steels : Mike Haskew in Blade magazine (PDF)
* ZDP-189 Is This the Best steel Ever? : Durwood Hollis in The Steel Bin (PDF)
Knives personally used in ZDP-189 :
* Spyderco : Delica, Calpyso Jr., Jess Horn : 64/65 HRC
There have been some comments about problems with sharpening of ZDP-189 on ceramic rods, however feedback from user with waterstones typically praising ease of obtaining a high sharpness. Comments have been made about edge damage on ZDP-189 through edge pitting and other reports of corrosion. There have also been some issues with chipping in light cutting but the frequency of reports is very low, especially to S30V.
The ZDP-189 Delica was compared to the VG-10 Delica on slicing 1/8" cardboard through 4 centimeters of edge and found to have significantly better early edge retention and a small advantage in extended use. This was repeated with a 1200 DMT finish on 1/4" cardboard and the ZDP-189 Delica had again significantly better early edge retention and a more significant advantage in extended use. All three Spyderco ZDP-189 blades were compared to multiple S30V blades and the ZDP-189 knives were found to on average cut 57 (8) % more cardboard than the S30V blades before reaching a similar level of blunting.
Summary : ZDP-189 is a powder metallurgy martensitic stainless steel made by Hitachi Metals. ZDP-189 is mainly promoted for the very high hardness 66/67 HRC which is rare in staniless steels.
Pojavila se nova nada na obzoru a zove se:
ZDP-189
ZDP-189 is a powder metallurgy stainless steel made by Hitachi Metals of Japan. The actual composition of the steel is unkown publically as Hitachi has described it as 3C20CrMoW, thus the molybdenum and tungsten amounts are unknown. Cowry X is a similar steel made by the Daido Corporation which also has the same carbon and chroimum content but also contains 0.3% vanadium and 1% molybdenum so ZDP-189 may have similar amounts of molybdenum and tungsten raplacing the vanadium as those two have similar effects. While the large amount of primary carbides would seem to suggest issues with sharpness the only problems reported are with sharpening on ceramic rods which can in general cause issues with high hardness steels. In general feedback from user on sharpeness and sharpness is high. Materials data on ZDP-189 :
* Hitachi materials information on ZDP-189 (translated)
* additional hitachi information
* a fairly vague composition reference from Hitaci
* CATRA results for 440C, VG-10, S30V, S90V, ZDP189, S125V from Spyderco
Promotional material from makers/manufacturers :
* The ferrari of blade steels : Mike Haskew in Blade magazine (PDF)
* ZDP-189 Is This the Best steel Ever? : Durwood Hollis in The Steel Bin (PDF)
Knives personally used in ZDP-189 :
* Spyderco : Delica, Calpyso Jr., Jess Horn : 64/65 HRC
There have been some comments about problems with sharpening of ZDP-189 on ceramic rods, however feedback from user with waterstones typically praising ease of obtaining a high sharpness. Comments have been made about edge damage on ZDP-189 through edge pitting and other reports of corrosion. There have also been some issues with chipping in light cutting but the frequency of reports is very low, especially to S30V.
The ZDP-189 Delica was compared to the VG-10 Delica on slicing 1/8" cardboard through 4 centimeters of edge and found to have significantly better early edge retention and a small advantage in extended use. This was repeated with a 1200 DMT finish on 1/4" cardboard and the ZDP-189 Delica had again significantly better early edge retention and a more significant advantage in extended use. All three Spyderco ZDP-189 blades were compared to multiple S30V blades and the ZDP-189 knives were found to on average cut 57 (8) % more cardboard than the S30V blades before reaching a similar level of blunting.
Summary : ZDP-189 is a powder metallurgy martensitic stainless steel made by Hitachi Metals. ZDP-189 is mainly promoted for the very high hardness 66/67 HRC which is rare in staniless steels.