Technicality at the service of the gesture: 10CR15CoMoV Steel

The power of Cobalt and Carbon

The Yellow Sea Series represents Kaitsuko's high-performance segment. The blade's core is forged from 10CR15CoMoV steel, a premium alloy that reaches a hardness of 60 HRC. The addition of Cobalt allows for an extremely sharp edge (15° angle) to be maintained twice as long as standard steel. The 67 layers of Damascus protect this hard core while providing the necessary mechanical flexibility to the blade.

Hammering and unique patterns

Each blade is a unique piece of craftsmanship. The folding and forging process creates natural wavy patterns on the steel, while precision hammering reduces the contact surface with food, creating a non-stick effect during cutting.

Analysis of the 7-piece set: Absolute versatility

This box set has been rigorously assembled to offer a technical solution to every culinary challenge:

1. Large Chef's Knife (234g): The power tool for large cuts of meat and voluminous vegetables.

2. Chef's Knife (191g): More maneuverable, it is the pivot of your kitchen for slicing and preparing daily proteins.

3. Nakiri Knife (279g): Its rectangular blade is the Japanese standard for slicing vegetables without crushing them, thus preserving all their flavors.

4. Santoku Knife (244g): The master of fragile foods. Its geometry limits adhesion for clean cuts on delicate fish and vegetables.

5. Bread Knife (175g): A specifically designed serration to cut through the hardest crusts without tearing the crumb.

6. Boning Knife (125g): Rigid and precise blade to separate meat from bone with minimal loss. Note: designed to go around the bone, not to cut through it.

7. Utility Knife (217g): The ideal complement for all precision cuts requiring great agility.

Maintenance guide for a lasting investment

60 HRC steel is a precision instrument that requires special care:

• Washing: Exclusively manual with soapy water. Dishwashing is strictly forbidden (risk of micro-cracks on high-hardness steel).

• Drying: Wipe immediately with a soft cloth. Thorough drying protects the luster of the resin handle.

• Cutting surface: Always use a wooden cutting board. Glass or marble surfaces would instantly dull your Damascus blade.

• Technical gesture: Never push food with the cutting edge; always use the back of the blade.

The 10CR15CoMoV steel of the Yellow Sea Series is harder than most commercially available steel sharpening steels.

• To avoid: Using a standard sharpening steel could scratch your blade or cause chipping (micro-chips) instead of straightening the edge.

• Expert recommendation: For this alloy, maintenance is done exclusively with a Japanese whetstone. Periodic passes on a 3000 grit (maintenance) then 8000 grit (mirror polish) are essential to maintain the 15° angle and the original gliding sensation.

The expert's opinion in brief:

• Material: 10CR15CoMoV steel core (60 HRC), San Mai technique with 67 layers of Damascus.

• Performance: Durable razor-sharp edge thanks to the cobalt-enriched alloy.

• Design: Amber yellow epoxy resin and stabilized wood handles, offering a sunny aesthetic and perfect ergonomics.

• Savings: A price advantage of up to 48% compared to purchasing individually.

The Kaitsuko Expert's Verdict

The Yellow Sea Series is for those who have already mastered soft steels. It is an uncompromising instrument: the 60 HRC hardness does not accept approximation; it requires precise movements to offer incomparable glide.

This set of 7 knives constitutes a long-term investment, protected by a blade warranty. By choosing this set (Unit value €900), you make a saving of €350, an unbeatable value for money for such forging quality.

Balance and the Science of Surface

A 60 HRC blade is a surgical precision instrument, but its rigidity makes it vulnerable on unsuitable surfaces.

• The danger of plastic: Hard polymer or glass cutting boards are technical enemies. They cause micro-rebounds that instantly dull the edge.

• The advantage of End-Grain Wood: We recommend using an end-grain wood cutting board. Scientifically, as studies from the University of Wisconsin point out, wood has hygroscopic properties that trap and neutralize bacteria, while offering a "soft" surface that accommodates the edge of your Damascus knife without breaking it.

Design and Ergonomics: The Yellow Sea fusion

The handle is the essential contact point between the cook and the tool. In this series, we use a mixture of stabilized wood and epoxy resin:

• Dimensional Stability: Stabilized wood does not react to humidity, guaranteeing lifelong durability.

• Perfect Balance: The balance point is designed to reduce wrist fatigue during prolonged use.

• Natural grip: The ergonomic shape ensures total control of movements, even for the most complex cuts.

The Rigor of Selection

While the design is inspired by Japanese solar aesthetics, performance relies on the thermal control of 10CR15CoMoV steel. We have selected this alloy for its molecular stability, offering you a hardness of 60 HRC (equivalent to Seki standards) with an optimized performance/price ratio.

We ensure strict production outgoing control: the final polishing must reveal the 67 layers without any roughness, guaranteeing that the Damascus pattern is not just an adornment, but the proof of successful multi-layer forging.

Technical Specifications