ZDP-189 Gyuto Black 210mm (8.3") - BLADE

 The ZDP-189 Gyuto blade is available without a handle. This is your chance to make your own handle or order it separately so you can put together a one-of-a-kind knife that is perfectly suited to your taste and needs. The knife is also available with an octagonal handle in walnut wood.

The 210mm Gyuto design will mostly cater to the needs of chefs who prefer a medium-sized, multi-purpose knife for cutting meat, fish, and vegetables. The color of the blade is dark which is the reason this look is also called Kuro-uchi finish – the word “kuro” means black. This look is traditional and robust, with an unprocessed top part of the blade that has already developed a dark patina. The hand-forged blade bears visible signs of being pounded with a hammer. This doesn’t only give it a beautiful, rustic finish but also prevents food from sticking to its surface.

BLADE SHAPE:
The blade shape of the gyuto is essentially a Japanese version of the chef's knife, making this knife suitable for preparing large quantities of vegetables and meat. The length of 210 mm is optimal for everyday versatile use, whether you are a home cook or a professional chef. A pointed tip allows piercing and precise, delicate work. A slight curve between the tip and the midsection makes the belly great for rocking the blade back and forth when cutting. It can be used for cutting meat, fish and vegetables.

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.

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.

The knife is laminated, forged, and heat treated by the blacksmith in his small smithy in the south of Japan. The kuro-uchi finish has a touch of rusticity and robustness that comes with the purely handmade blade. Handles are in different shades of brown, from dark brown to light brown. Therefore, each piece is completely unique.