ZDP-189 Kiritsuke Black 240mm (9.5")

ZDP-189 Kiritsuke Black 240mm (9.5") is manufactured at the smithy of Yoshida Hamono in Japan, a family company with an age-long tradition in manufacturing state-of-the-art tools and Japanese swords (katanas) by hand. Yoshida Hamono has a great deal of experience forging ZDP-189 steel in the traditional manner. See the photo story from our visit to their smithy.

BLADE SHAPE:
ZDP-189 Kiritsuke Black is a longer and larger brother of our bestseller ZDP-189 Bunka Black.

Kiritsuke knives have a special place in the Japanese (strict) kitchen hierarchy. Japanese traditions only allow the Executive Chef to wield this knife. But since most of us reside outside of Japan, we can kind of omit the strict rules and enjoy this multi-purpose chef's knife in our home kitchens too! Kiritsuke knives are hybrids between the traditional Japanese knife Yanagiba (slicer knife, mostly used for sushi) and the Usuba (knife specialized to cut vegetables), meaning they can be used for all sorts of tasks in the kitchen, from making sashimi, slicing through ribeye, to chopping veggies.

Although traditionally kiritsuke knives are single bevel, Yoshida ground this one on both sides (double bevel) to cater to the needs of Western users. This knife can be a great alternative to the Gyuto knives, however due to its straight edge (very little belly curve), Kiritsuke won't rock through cuts as the Gyuto does.

STEEL:
The heart of the knife is made of ZDP-189 steel, which we selected because systematic testing has proven its superior qualities and long-lasting sharpness.

The steel contains as much as 3% Carbon (C), which is one of the main elements contributing strength and typically found in amounts of up to only 1% in other types of solid steel, while the Chromium (Cr) content, which prevents corrosion, amounts to nearly 20%. It also features 0.60% Tungsten (W), which considerably increases the abrasion resistance of steel, 1.4% Molybdenum (Mo), which helps to preserve the strength and power of steel under variable temperatures, and 0.10% Vanadium (V), the key element in increasing steel strength. Heat treatment produces steel with a hardness of 65-67 HRC.

ZDP-189 composition: C 3.00 % | Cr 20.00 % | W 0.60 % | Mo 1.40 % | V 0.10 % | Mn 0.50 % | Si 0.40 %

LAMINATION:
The steel is laminated, meaning that the core is made of very strong steel covered with an external layer of softer stainless steel - also known as warikomi clad. The softer external layer protects the core steel from external factors.

The hard core of a knife is sandwiched between two layers of softer steel, reaching only up to a half of the blade’s width. This specific type of construction is used for steels that are very challenging to forge, for example for certain types of powder steels. A glowing hot piece of iron is split and a piece of steel is inserted. The material is now forged into one piece. This creates a highly durable kitchen knife with a slightly more pliable core. The main advantage of these knives is that they are thin, sharp and retain their edge very well. Warikomi is also called the “split and insert method”. 

GEOMETRY:
This knife has a double bevel (symmetrical) blade with a low profile and a V-edge grind, which gives it a good balance between the ease of cutting and robustness. This kind of grind produces very sharp edges and is wonderful at making very thin slices. 

BLADE FINISH:
Kuro-uchi finish, the unprocessed (black) part on the top side of the blade has already developed a dark patina, which protects the blade and gives it a traditional Japanese look. 

The knife bears barely visible impressions of the hand-forging process (round hammer dents on the blade), which gives it a beautiful rustic finish and also prevents food from sticking to the blade. Kanji  登録 九佐吉作 "registered as work of Yoshida Smithy in Saga Prefecture, Kyushu, Japan" has been chiseled onto the blade.

HANDLE:
Kiritsuke Black was fitted a traditional Japanese wooden handle, called Wa handle. The wooden handle is made of walnut wood with an octagonal shape, so it will fit equally well into the hands of right- or left-handed users.

BLACKSMITH:
The knife is manufactured at the smithy of Yoshida Hamono in Japan, a family company with an age-long tradition in manufacturing state-of-the-art tools and Japanese swords (katanas) by hand. Yoshida Hamono has a great deal of experience forging ZDP-189 steel in the traditional manner. See the photo story from our visit to their smithy.