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By Myojin Riki

Myojin Riki Seisakusho SG2

Sanmai - Stainless Clad Kasumi SG2 / R2 / Stainless Stainless Clad Tosa, Japan

Myojin Riki Seisakusho as a father-and-son workshop is operated by Myojin family, the son Naohito is the sharpener and polisher of the double bevel knives in the workshop and the level of fit and finish achieved is top notch in the industry. Famous work that Naohito works on includes Konosuke Fujiyama FM series, the Tetsujin brand and some of the really rare blades forged by Hashimoto Shoichi. Aside from these collaborations, Naohito also keeps some personal lineups, which include a Ukiba Cobalt Special steel line and this Kasumi SG2 line.

The sharpening approach for these SG2 knives are not nearly as aggressive as the Tetsujin knives, the bevel is a bit thicker, but is still in a very comfortable convex grind that would flow through most foods without much resistance. Although it would wedge more in very dense roots like carrot and sweet potatoes, but in a more succulent food like a fresh white potato, the stronger convex resulted from a thicker blade can encourage food separation, and I feel these SG2 is bit less sticky than the Tetsujin when dealing with these kind of food.

The SG2 doesn’t need much introduction, it is still one of the best kitchen knife steels you can find without going to the steels that are impossible to sharpen. It scores pretty high in edge retention while being fully stainless, which makes a good material for professionals as it requires sharpening less frequently and doesn't need special care.

The fit and finish is phenomenal, but also what you would expect from Naohito Myojin. The super consistent Kasumi finish covers the entire soft steel cladding, which just makes the polished core steel and spine pops out on the edge. Every sharp corner is cleanly chamfered and despite the crisp boundary between each surface, the choil and spine doesn’t feel sharp at all. This silky smooth Kasumi has just the right reaction when cutting food as it is not too rough to create friction and not too smooth to stick.

As the Naohito Myojin is now recognised as the top sharpener of the industry, he is very caught up in all kinds of jobs, and being the only person working on these different projects, any of his knives would be highly sought after. This SG2 is one of those items and it has the best steel(edge retention wise), which makes it very hard to come by. Whether you are a collector, knife enthusiast or pro chef looking for a good tool, this line is something you would want to try out if the opportunities come by.

Pros

  • Excellent performance
  • Thin behind the edge
  • Excellent fit and finish

Cons

  • A little bit brittle

Best For

  • Pro chefs
  • Enthusiasts
  • Collectors
Construction
Sanmai - Stainless Clad
Surface Finish
Kasumi
Cladding
Stainless Clad
Steel
SG2 / R2 / Stainless
Origin
Tosa, Japan

Frequently asked questions

Does Myojin Riki forge its own knives?

Yes. Kochi City's craft page for his workshop 明神利器製作所 says the work runs from forging through finishing in one continuous process, 鍛造から仕上げまで一貫して行う.

That page lists the workshop in Susaki, Kochi.

Published by K&S Education Desk; staff review pending

SG2 steel knives at Knives and Stones

SG2 (Super Gold 2, which Takefu writes as SPG2) is Takefu Special Steel's own blade steel, made by powder metallurgy. Takefu says it meets all four of what it calls the major requirements for a blade: high hardness, high toughness, good wear resistance and excellent corrosion resistance.

SG2 runs 61 to 65 HRC depending on the maker, and Takefu does not publish its composition. As of 18 October 2026, 291 of the knives we list have SG2 in their title.

Reviewed by K&S Staff · Last updated 30 May 2026

What is the hamaguri-ba edge on the knives we list as Myojin Riki?

A hamaguri-ba edge, written 蛤刃, is a convex edge shape, and it is the shape the workshop 明神利器製作所 sharpens its knives to. Kochi City's craft page records that the workshop's second generation, whose name the page gives as 直人, learned it over several years of training in Fukui.

The same page says the workshop also takes sharpening-only orders from outside Kochi.

Published by K&S Education Desk; staff review pending

What is the difference between VG10 and SG2?

Both are Takefu blade steels, and they differ in class and in what Takefu publishes about each. Takefu lists VG10 as a stainless steel with 1.00% carbon, 15.00% chromium, 1.00% molybdenum, 0.25% vanadium and 1.55% cobalt, at a hardening hardness of HRC 60 or more.

Takefu describes SG2, its Super Gold 2, as a blade steel created by powder metallurgy, lists its composition as not disclosed, and SG2 runs 61 to 65 HRC depending on the maker. Takefu also calls SG2 a powdered stainless high-speed steel.

Published by K&S Education Desk; staff review pending

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