Review of SG2 Steel as a Knife Steel

All knives produced for consumers are made to reach the desired potential, and SG2 steel knives are one of those products that have gained a name of their own.

Keep reading to learn everything you’ll need about SG2 steel, its composition, features, pros and cons, uses and comparison with other knife steels.

Key takeaways: SG2 steel at a glance

• Hardness: 62-64 HRC (Extremely hard, allowing for a laser-sharp edge).
• Origin: Developed by Takefu Special Steel Co., Ltd. in Japan.
• Aliases: Also known as R2 (Kobelco) or SGPS (Super Gold Powder Steel).
• Edge Retention: Exceptional; holds a sharp edge significantly longer than VG10.
• Corrosion Resistance: High; fully stainless and low-maintenance.
• Best For: Professional chefs and enthusiasts who want elite performance without the maintenance of carbon steel.

What is SG2 steel?

SG2 steel is high-carbon stainless steel, mostly utilized as a knife steel. The name stands for Super Gold 2, stating its level of quality. SG2 is considered a super steel produced through powder metallurgy, it is also called SGPS (abbreviation for Super Gold Powder Steel).

SG2 steel was developed by Takefu Special Steel Co., Ltd, a Japanese company dedicated to produce high-end steel for the knife market. SG2 was released to the market in 1991 and became popular after its predecessor, SG1 steel, was halted.

SG2 was recently taken off the by Takefu, so it’s not widely available as before. However, it still has a wild popularity in the market, thus, they are now produced by other knife makers.

Pro Tip: There is often confusion in the market between SG2 and R2. They are effectively the same steel. While Takefu markets it as SG2, the steel is originally produced by Kobelco (Kobe Steel) as R2 and then processed/sold by Takefu as SG2. Whether your knife is labeled SG2 or R2, the performance metrics are identical.

SG2 steel composition

SG2 has a high amount of carbon and chromium that makes it a high carbon stainless steel. It’s also known by the ‘impurities’ in composition that shapes its property vastly, let’s take a look:

• 1.25-1.45 % Carbon (C): Carbon is the fundamental element alongside Fe when forming steel. While it’s essential, The amount is significant to make a difference. Since it’s a high C steel  SG2 is a hard, tough and durable material.
• 14.00-16.00 % Chromium (Cr): Cr in the 10-11% range is sufficient to classify SG2 as stainless steel. However, higher Cr content makes SG2 more resistant to corrosion. Cr also increases brittleness, yet it is not high enough to cause a big deal.
• 2.3-3.3 % Molybdenum (Mo): Mo is added for additional corrosion resistance, but this isn’t this element’s only contribution. Mo also boosts tensile strength, hardenability and edge retention.
• 1.8-2.2 % Vanadium (V): V addition increases strength, toughness and wear resistance.
• 0.50% Silicon (Si): Si exists mainly to remove oxygen. However, it also increases strength and hardness.
• 0.40% Manganese (Mn): A small amount of Mn addition to SG2 steel increases the materials’ wear resistance and strength and decreases rigidity.
• 0.03% Phosphorus (P): P is considered an impurity in the material and enhances brittleness. Yet, it improves corrosion resistance and strength.
• 0.03% Sulfur (S): S addition increases brittleness, but on the other side, a small amount increases machinability.

Source: zKnives – SG2 Steel Composition Analysis

SG2 as a powder steel knife

SG2 steel stands out as powder metallurgy manufactured steel.

To put it more simply, powder metallurgy is a method in which metal parts are made using fine metal powders under 1 mm. With this method, metals that other methods cannot produce can be obtained.

Being produced by powder metallurgy enables SG2 steel knives to reach a gold standard quality in kitchen knives. The consistent grain structure of SG2 powder steel provides various properties. As we will talk about the properties of SG2 steel in the following.

Properties of SG2 steel

Hardness

As a consequence of powder metallurgy techniques and high carbon content, SG2 is one of the hardest steel out there.

It can reach up to 64 HRC hardness on the Rockwell scale. This is an essential characteristic for a knife. Harder in steel means the steel is able to cut through ingredients with significantly less force.

Toughness

While it’s a metallurgical rule that harder steels are generally more brittle, SG2 defies this to an extent. Thanks to the Powder Metallurgy process, its micro-carbides are distributed much more evenly than in traditional steels like VG10.

This results in an edge that is actually less prone to large chips than many lower-hardness stainless steels, provided it is used with proper technique on a wood or synthetic board.

Ease of sharpening

Despite its hardness, SG2 steel is not so difficult to sharpen. The fine grains resulting from being powder steel make this material sharp and easy to sharpen.

Edge retention

Due to the high Vanadium and Carbon content, SG2 forms hard carbides that resist wear. In a busy professional kitchen, an SG2 knife can often go weeks without needing a full sharpening session, requiring only occasional stropping.

Corrosion resistance

High Cr and Mo in the composition of the steel make it resistant to corrosion. Thanks to this feature it is suitable to use in humid and salty environments.

Wear resistance

SG2 has a high level of wear resistance and works well under adhesive and abrasive conditions. Also SG2 is sometimes laminated so it adds extra protection to its surface and prevents wear.

Why are SG2 steel considered good for kitchen knives?

SG2 is designed for high-end kitchen knife products. They are extremely hard in order to make fine slices. They offer great edge retention, wear resistance, and decent toughness. On top of that, SG2 steel is easy to sharpen for a home cook. It’s safe to say that SG2 steel is one of the most trouble-free choice for a kitchen knife steel.

In summary, it is one of the best steel for any knife businesses. The only downside – and it’s a big one – is it’s a rather expensive steel and is hard to come by.

Pro-Expert Tip for SG2 Owners: Because SG2 edges are ground so thin and hard, they are "lasers." Avoid "rocking" cuts with heavy lateral pressure, as this can cause micro-chipping. Stick to push-cuts or draw-cuts. For maintenance, we recommend a high-grit whetstone (3000-6000 grit) to truly unlock the "Super Gold" potential of the edge.

SG2 steel vs. other steel

Steel Type	Hardness (HRC)	Edge Retention	Toughness	Corrosion Resistance	Sharpenability	Best For
SG2 (R2)	62-64	⭐⭐⭐⭐	⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐	Professional Daily Driver
S30V	58-61	⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐	⭐⭐	Outdoor & Folding Knives
ZDP-189	64-67	⭐⭐⭐⭐⭐	⭐	⭐⭐⭐	⭐	Elite Collectors
Blue Steel (AS)	63-65	⭐⭐⭐⭐	⭐⭐	⭐	⭐⭐⭐⭐⭐	Traditional Sushi Knives
VG-10	60-61	⭐⭐⭐	⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	All-Purpose Kitchen Use
HAP40	64-68	⭐⭐⭐⭐⭐+	⭐⭐⭐	⭐⭐	⭐⭐	Extreme Edge Enthusiasts
AUS-10	58-60	⭐⭐	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐⭐	Budget-Friendly Workhorse
MagnaCut	61-63	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	⭐⭐⭐⭐⭐+	⭐⭐⭐⭐	Saltwater & High-Humidity

SG2 vs S30V: S30V is powder steel, just like SG2. The main difference between them is that S30V contains more Vanadium. The addition of Vanadium forms vanadium carbides, and as a result, hardness, edge retention, and wear resistance improves and the ease of sharpening declines. 

SG2 vs ZDP 189: ZDP 189 is also a super steel produced through powder metallurgy. It is similar to Cowry X in terms of composition and performance. Having 3% C and 20% Cr content, ZDP 189 is a high Carbon, high Chromium steel. Unfortunately, this composition makes it hard to work with, so ZDP 189 steel knives are often handmade and rare.

SG2 vs Blue steel: Blue steel is another Japanese steel  known as Aogami. Aogami is also a high C steel with a great sharpness and edge retention. Blue steel is one of the most preferred Japanese steels in knife making and was frequently produced for sushi knives. Aogami steel has three different types: Aogami#1, Aogami#2 and Aogami Super. The main differences between blue steel and SG2 are blue steel non-stainless.

SG2 vs VG 10: VG10 is another Takefu Steel Japanese knife product manufactured for kitchen knives. SG2 steel has better edge retention, ease of sharpening and corrosion resistance. On the other hand, VG10 is more versatile(all-purpose), lighter and cheaper. There is also VG-MAX, a version of VG10 with higher Cr and Mo content.

SG2 vs. HAP40: HAP40 is a semi-stainless powder tool steel with extreme hardness (up to 68 HRC), offering edge retention that surpasses SG2. However, it is more prone to patina and rust due to its lower Chromium content. While HAP40 stays sharp longer, it is significantly harder to sharpen than SG2, making SG2 the more practical, maintenance-free choice for most chefs.

SG2 vs. AUS-10: AUS-10 is a traditional high-carbon stainless ingot steel that is tougher and more affordable than powder steels. While it is corrosion-resistant and beginner-friendly to sharpen, it lacks SG2’s 62-64 HRC hardness and ultra-fine grain. SG2 provides a much sharper, thinner edge and superior edge retention, serving as a high-performance upgrade over the workhorse-grade AUS-10.

SG2 vs. MagnaCut: MagnaCut is the latest “buzzword” in the knife community. While MagnaCut offers superior corrosion resistance (nearly rust-proof), SG2 typically reaches a higher hardness (64 HRC vs. 61-63 HRC) and provides a keener, more surgical edge that professional Japanese knife enthusiasts prefer for delicate slicing.

Closing

SG2 steel is one of the best choice as your brand’s primary steel. If you are targeting a high-end, professional crowd of chefs, and has the budget and commitment for the production, SG2 will surely accomplish your expectations.

Contact us today if you are interested in selling knives like SG2, at LeeKnives, we provide a list of services for Dropshipping, wholesale, OEM and ODM to scale your business.

Frequently asked questions

Is SG2 steel hard to sharpen?

While SG2 is very hard, it is not “difficult” to sharpen if you use quality whetstones. Because of its fine grain, it takes a keen edge relatively quickly compared to other super steels like ZDP-189. Most users find it easier to sharpen than HAP40.

Does SG2 rust easily?

No. SG2 is highly corrosion-resistant. However, “stainless” does not mean “stain-proof.” You should still hand-wash and dry your knife after use. Never put an SG2 knife in the dishwasher.

Is SG2 better than carbon steel?

“Better” depends on your needs. For edge retention and maintenance-free use, SG2 is superior. For those who enjoy the ritual of maintaining a patina and want the absolute peak of “bite” on an edge, traditional carbon steel (Aogami) is preferred.

What brands use SG2 steel?

Many elite Japanese brands utilize SG2, including Shun (in their Reserve and Nagare lines), Miyabi (Birchwood and Black series), and Enso. Custom makers like Kobayashi are also famous for their R2/SG2 blades.

Is SG2 worth the extra cost?

If you are a professional chef or a home cook who values high-performance tools that stay sharp for long periods, yes. The time saved on sharpening and the quality of the cuts make it a worthwhile investment.

Why is SG2/R2 often considered “less chippy” than VG10 despite being harder?

This is the magic of Powder Metallurgy. While VG10 is a traditional ingot steel with larger, uneven carbide clusters, SG2 has a super-fine and uniform grain structure. This uniformity allows SG2 to distribute stress better, meaning it’s actually tougher and less prone to significant chipping than many traditional stainless steels at similar or even lower hardness levels.

Does SG2 really feel like carbon steel on the whetstones?

SG2 is famous for being the most “carbon-like” stainless steel. Because of its high purity and fine grain, it doesn’t feel “gummy” or slippery on stones like some cheaper stainless steels. While it won’t perfectly match the buttery feel of Aogami Super, it offers excellent feedback and responds much faster to high-grit stones than other super steels like HAP40 or S30V.

Is there a performance difference between knives labeled “SG2” versus “R2”?

Simply put: No. SG2 (Takefu Special Steel) and R2 (Kobe Steel/Kobelco) refer to the exact same chemical composition and powder metallurgy process. The difference is purely branding—some blacksmiths and brands prefer one name over the other. Whether your blade says SG2 or R2, you are getting the same elite-tier “Super Gold” performance.