SPG2 (Super Powder Gold 2)
SPG2 / SG2 – premium Japanese powder steel
SPG2, also known as SG2 or Super Gold 2, is a high-performance Japanese powder stainless steel. It offers high hardness, long edge retention, a fine structure and good corrosion resistance. It is intended for cooks who want exceptionally precise cutting without the demanding care typical of carbon steels.
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Why choose a knife made from SPG2 steel?
SPG2 / SG2 is one of the best-known powder steels used in the production of premium Japanese kitchen knives. Thanks to powder metallurgy, the material has a fine and uniform structure that makes it possible to create a thin, sharp and stable edge.
The high carbon content provides the necessary hardness, chromium contributes to corrosion resistance, and vanadium together with molybdenum supports wear resistance. The result is a steel that, when used correctly, offers very long edge retention while remaining practical for everyday work in the kitchen.
Long edge retention
Hard and evenly distributed carbides slow down wear of the cutting edge.
Hardness around 63 HRC
In Kanetsugu ZUIUN knives in this category, the core reaches a hardness of 63 ± 1 HRC.
Good corrosion resistance
Approximately 15% chromium helps protect the blade against corrosion during normal use.
Precise cutting
The fine structure of the steel makes it possible to create a sharp edge suitable for precise cutting.
SPG2, SG2 and Super Gold 2 – what is the difference?
On the market, you may encounter the designations SPG2, SG2, Super Gold 2 or SG2 Powder Steel. On the knives in this category, the designation SPG2 refers to the Japanese powder steel Super Gold 2. It therefore does not indicate the number of layers or a separate type of Damascus steel, but rather the material that forms the cutting core of the blade.
In technical materials, the designation SG2 – Super Gold 2 is used most often. The notation SPG2 emphasises the powder production process and is used by some manufacturers and retailers. When comparing knives, it is always important to consider not only the name of the steel, but also the knife manufacturer, heat treatment, hardness and blade geometry.
Typical composition of Super Gold 2
| Element | Typical content | Practical significance |
|---|---|---|
| Carbon | 1,40 % | Makes it possible to achieve high hardness and supports carbide formation. |
| Chromium | 15,00 % | Contributes to corrosion resistance and wear resistance. |
| Molybdenum | 2,80 % | Supports hardenability, strength and stability of the steel. |
| Vanadium | 2,00 % | Forms hard carbides that help extend edge retention. |
The values shown represent a typical analysis of Super Gold 2 material. A specific production batch may vary within the permitted tolerances.
What does powder metallurgy bring?
In powder metallurgy, molten steel is atomised into fine particles, which are then consolidated into a compact material. This process helps limit the formation of large carbide clusters and creates a finer and more uniform microstructure.
For a kitchen knife, the result is the ability to achieve high hardness, good edge stability and a precise grind. Powder steel alone, however, does not guarantee the best cutting performance. Heat treatment, blade geometry, thickness behind the edge and sharpening quality remain equally important.
SPG2 versus VG-10
| Property | SPG2 / SG2 | VG-10 |
|---|---|---|
| Production | Powder metallurgy | Conventionally produced stainless steel |
| Typical knife hardness | Higher, often around 62–64 HRC | Often around 59–61 HRC |
| Edge retention | Very high | Very good |
| Sharpening | Requires quality stones and precise angle control | Usually slightly easier |
| Suitable for | Demanding home and professional cooks | Broad everyday use |
High hardness requires proper handling
SPG2 knives are not intended for bones, hard pits, frozen foods or prying. At high hardness, the edge retains sharpness for a very long time, but the fine cutting edge is sensitive to hard impacts and lateral stress.
Which SPG2 knife should you choose?
| Model | Best use | Knife character |
|---|---|---|
| Kanetsune WA-Santoku 180 mm | Vegetables, boneless meat, fish and herbs | Agile all-purpose knife with a three-layer construction. |
| Kanetsune WA-Chef/Gyuto 210 mm | All-purpose preparation and larger ingredients | Longer main chef’s knife for a wide range of tasks. |
| Kanetsugu ZUIUN KIWAMI Santoku 180 mm | Precise everyday cutting | Damascus construction, 63 ± 1 HRC core and DLC coating. |
| Kanetsugu ZUIUN KIWAMI Kiritsuke 210 mm | All-purpose cuts and precise tip work | Distinctive profile, Damascus blade and protective DLC coating. |
| Kanetsugu ZUIUN KIWAMI Sujihiki 240 mm | Slicing meat, fish, ham and sashimi | Long narrow blade for a clean cut in a single stroke. |
DLC coating on the ZUIUN KIWAMI series
Selected Kanetsugu ZUIUN KIWAMI knives have a Damascus blade coated with DLC – Diamond-Like Carbon. The thin carbon layer creates the characteristic dark appearance and helps protect the coated part of the blade against surface wear.
DLC is not indestructible and does not replace proper care. Contact with abrasive materials, hard objects or incorrect sharpening may damage it. The edge, which is abraded during sharpening, is not permanently protected by the coating.
Sharpening and care
Thanks to its fine structure, SPG2 can be sharpened to a very sharp edge. Its higher hardness and wear resistance, however, require quality abrasives and precise angle control. Suitable equipment can be found in the knife sharpening category.
- Wash the knife by hand only and dry it immediately.
- Do not put it in the dishwasher.
- Use a wooden or high-quality synthetic cutting board.
- Avoid glass, ceramic, stone and metal boards.
- Do not cut bones, frozen foods or hard pits.
- Do not use the blade for prying and do not twist it during a cut.
- Store the knife in a stand, on a magnetic strip or with an edge guard.
Need advice?
Contact us at +420 702 049 048, Mon–Fri, 7:30–16:00. We will help you compare SPG2 with other premium powder steels and choose the right knife shape and length.
Frequently asked questions about SPG2 / SG2
What is SPG2?
SPG2 is a designation used for Japanese Super Gold 2 powder stainless steel. It is characterised by high hardness, a fine structure and long edge retention.
Is SPG2 the same as SG2?
On the knives in this category, the designation SPG2 is used for SG2 steel, also known as Super Gold 2. When comparing specific knives, it is also advisable to verify the manufacturer and heat treatment.
Is SPG2 a powder steel?
Yes. Powder metallurgy helps create a fine, clean and uniform structure with well-distributed carbides.
What hardness does SPG2 have?
Hardness depends on the heat treatment of the specific knife. In the Kanetsugu ZUIUN series in this category, the core reaches 63 ± 1 HRC.
Is SPG2 stainless?
Yes, it is a stainless knife steel with good corrosion resistance. Stainless does not mean completely stain-proof, however, so wash and dry the blade after use.
How long does SPG2 hold an edge?
With proper heat treatment and use, it offers very long edge retention. Blade geometry, the cutting board and cutting technique also matter.
Is SPG2 better than VG-10?
SPG2 usually achieves higher hardness and longer edge retention. VG-10 is generally more affordable and usually somewhat easier to sharpen.
Is SPG2 difficult to sharpen?
It is more demanding than ordinary softer steels, but quality water or diamond stones can sharpen it to a very fine edge.
Can an SPG2 knife go in the dishwasher?
No. A dishwasher can damage the fine edge, blade surface and handle. Always wash a quality knife by hand.
Can an SPG2 knife be used to chop bones?
No. A fine edge with high hardness is not intended for bones, frozen foods, prying or twisting during a cut.
