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HOSHANHO 9-Inch Kiritsuke Review: What the Steel Actually Delivers

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10Cr15CoMoV Steel: What It Is and What It Is Not

The HOSHANHO kiritsuke uses 10Cr15CoMoV as its core steel. This is a Chinese high-carbon stainless alloy — the designation breaks down as: 10 (carbon content approximately 1.0%), Cr15 (15% chromium), Co (cobalt), Mo (molybdenum), V (vanadium). The cobalt and molybdenum additions improve heat treatment response and corrosion resistance respectively. Vanadium refines the grain structure and adds wear resistance. Heat-treated to 59–62 HRC after vacuum processing and nitrogen cryogenic tempering.

The cryogenic tempering step is worth understanding. After a blade is quenched in vacuum at high temperature, residual austenite remains in the steel structure — austenite is a softer phase that limits the blade’s hardness ceiling. Nitrogen cryogenic tempering converts that residual austenite to martensite at very low temperatures, improving both hardness and microstructural uniformity. The result is a blade where the edge geometry holds more consistently through use than it would without this step. HOSHANHO applies this processing across their 10Cr15CoMoV line — it is not a marketing embellishment, it is a real process step with a measurable effect on performance.

What the steel is not: it is not a Japanese steel grade, regardless of how the product listing describes it. It is not VG-10. It is not SG2. It is a capable Chinese high-carbon stainless that performs well at its price tier and is appropriate for the cooking tasks this knife is designed for. Knowing that does not make the knife worse — it makes the buying decision more honest.

The 9-Layer Construction: What the Layers Actually Do

Nine layers in a kitchen knife means one core layer plus eight cladding layers — four on each side. The core is the 10Cr15CoMoV: hard, high-carbon, the material that forms the actual cutting edge. The eight surrounding composite stainless cladding layers are softer and more corrosion-resistant, protecting the harder core during everyday kitchen use.

This is a San-mai variant — a sandwiched construction where a hard core is clad in softer steel. The practical benefit is that the outer layers handle the exposure (moisture, acidic ingredients, impact with the cutting board) while the harder core maintains the edge geometry. The cladding is not decorative. It is why a knife with a hard, high-carbon core does not rust along the flat of the blade between every use.

What nine layers does not mean: it does not produce the visual Damascus pattern. HOSHANHO achieves their distinctive look through the hand-hammered tsuchime texture, not through acid-etched layer differentiation. Both are legitimate visual approaches — they are just different things, and it is worth understanding which you are looking at.

Blade Geometry: Edge, Spine, and the Hammered Surface

The factory edge comes in at 12–15° per side — double bevel, hand-sanded. In testing, the HOSHANHO kiritsuke passed the paper-slice test cleanly from the box without any conditioning on a whetstone. That is a meaningful benchmark: a knife that arrives sharp enough to cut cleanly through printer paper with no resistance is genuinely sharp, not marketing-sharp. The factory edge held through four weeks of daily prep before degrading to the point where a whetstone session was needed.

The 2.5mm spine is the honest limitation of this knife’s geometry. At 2.5mm the HOSHANHO is meaningfully thicker than a properly thinned Japanese gyuto or kiritsuke from a Sakai workshop, which typically runs 2.0–2.2mm and tapers toward the tip more aggressively. Through dense ingredients — butternut squash, large carrots, whole beetroot — you feel the difference. The blade does not glide through the way a thinner-ground knife does; it pushes slightly, and large slices of potato will drag against the blade face. The hand-hammered texture helps with this — reducing suction contact between blade and food — but it cannot fully compensate for spine thickness.

The hammered tsuchime surface deserves its own explanation. The shallow depressions along the blade create air pockets as the blade passes through food, breaking the suction that causes slices to stick to a flat-sided blade. In our cucumber slicing test, the HOSHANHO produced fewer stuck slices per 20-cut session than a smooth-faced blade at the same thickness. It is a functional feature — not as consistent as a Granton hollow-edge ground into the blade, but effective enough to be noticeable in daily use. It also makes the blade easier to wipe clean than a high-mirror-polish surface, which shows fingerprints and scratches more readily.

The Rosewood Handle: Grip, Balance, and Extended Use

The octagonal rosewood handle is the most consistently well-executed part of this knife. Natural rosewood — dense, moderately oily, and dimensionally stable — is a legitimate handle material at any price point. The copper wire collar at the blade end is not purely decorative: it seals the gap between handle and blade collar, reducing moisture ingress at the join. This matters for longevity. Handles that allow water into the blade-to-handle gap develop rot and loosening over time. The HOSHANHO’s collar design is sensible, not ornamental.

The octagonal profile fits a Japanese pinch grip cleanly. Your index finger and thumb find the corners of the handle naturally, and the forward-set balance point of the 228mm blade keeps weight where it belongs for draw-stroke slicing. In a 45-minute prep session that included eight portions of salmon, a pile of spring onions, and a butternut squash that tested the knife’s limits, the handle did not cause hand fatigue or grip shift. That is the test that matters — not how a knife feels for the first two minutes, but how it feels after forty.

The ambidextrous octagonal geometry is worth noting for left-handed cooks specifically. Most Japanese knives in the D-handle format are right-hand biased — the curved side sits under the right-hand grip and against the left. The octagonal profile has no side bias: eight equal faces, equal grip for either hand. If you are left-handed and have been working around D-handle knives, the HOSHANHO’s handle is a practical improvement.

Kitchen Performance: Six Weeks of Real Testing

The HOSHANHO kiritsuke was used as a primary prep knife in a working home kitchen for six weeks before scoring. Testing covered vegetable prep across 200g sessions per ingredient (julienne, dice, and chop), protein slicing (salmon portions, boneless chicken thighs, and cooked roast beef), and the draw-stroke fish slicing that the kiritsuke form is specifically designed for.

Vegetable performance was strong for the first four weeks. The 12–15° factory edge handled leeks, fennel, and courgette with minimal resistance, and the flat kiritsuke profile suited push-cut chopping well. The angled k-tip proved useful for piercing and detail cuts on fish skin before roasting — the specific technique where the kiritsuke geometry earns its place over a standard gyuto’s rounded tip.

Fish slicing was where the knife performed most distinctively. The 9-inch length allows a full draw-stroke through a salmon fillet in one pull without repositioning, which produces cleaner cuts and less tearing at the flesh. At 228mm, this knife is long enough to genuinely replicate the pull-stroke technique that a sujihiki or yanagiba uses for raw fish, at a price that makes dedicated slicers seem difficult to justify for home use. It is not a sujihiki — the blade is thicker and the grind is not as refined — but for occasional sashimi preparation and slicing cooked proteins, it handles the task competently.

By week five, the edge showed the first signs of degradation: the paper-slice test required light pressure to cut cleanly rather than zero pressure. A 20-minute session on a 1000-grit whetstone followed by a 3000-grit pass restored the edge to near-factory condition. The steel responded quickly to the whetstone, which is consistent with 10Cr15CoMoV’s known sharpening behaviour — it is an easy-to-sharpen steel, which is an underrated quality at the mid-range price tier.

The Kiritsuke Form: Who It Suits and Who It Doesn’t

The kiritsuke is a long knife with an angled k-tip, a flat edge profile suited to draw-stroke slicing, and a technique requirement that is steeper than most home cooks realise before they buy one. At 9 inches, the HOSHANHO demands a cutting board with at least 45cm of usable depth to pull the blade cleanly through large ingredients. Standard home cutting boards — 35–38cm deep — are too small. You end up angling the knife or shortening the stroke, which defeats most of the form’s advantages.

For cooks who already own a shorter all-purpose knife and are looking to add a dedicated slicing and prep knife for fish and longer proteins, the HOSHANHO 9-inch fills a real gap. It is also a reasonable choice for cooks who primarily do Japanese-style cooking — sashimi preparation, long draws through boned fish, detailed vegetable work — and want a longer blade without spending on a traditional yanagiba or sujihiki they will use only occasionally.

FOGAMA Blade Index Score: HOSHANHO 9-Inch Kiritsuke

How to Get the Most from the HOSHANHO Kiritsuke

Cutting Board Requirements

Use a wooden or plastic cutting board with at least 45cm (18 inches) of depth. At 9 inches of blade, you need room to complete the draw-stroke without the tip running off the board edge. A Japanese hinoki (cypress) board is ideal — soft enough that the edge stays sharp longer, aromatic enough to be pleasant, and large enough for the blade length. Glass and ceramic boards will destroy the 12–15° edge in one prep session.

Sharpening the 10Cr15CoMoV Edge

Sharpen at 12–15° per side — the factory angle. A 1000-grit whetstone for edge repair, followed by a 3000-grit for finishing, is the correct sequence. The steel responds quickly; you do not need a fine grit above 3000 unless you are chasing a mirror edge for sashimi work, in which case 6000-grit is the ceiling. Between whetstone sessions, a ceramic honing rod at the same 12–15° angle maintains alignment and extends the interval between full sharpenings.

Cleaning and Storage

Hand wash only. Mild soap, warm water, wipe immediately with a dry cloth. The hammered indentations in the blade collect residue from garlic and herbs — use a soft brush or the corner of a cloth to clean them rather than a scrubbing pad, which will scratch the surface finish. Store on a magnetic strip or in a blade guard. Knife blocks expose the edge to repeated lateral contact that dulls the bevel over time.

HOSHANHO Kiritsuke: Frequently Asked Questions

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