One of the most confusing parts of buying a Japanese kitchen knife is understanding the steel.
VG10, SG2, Ginsan, Aogami Super, White #2, AUS10, HAP40 — the names can quickly become overwhelming, especially if you are buying your first Japanese knife.
The important thing to understand is that there is no single “best” Japanese knife steel.
Different steels offer different combinations of sharpness, edge retention, toughness, corrosion resistance, ease of sharpening and price. The right choice depends on how you cook, how much maintenance you are comfortable with, and what you expect from your knife.
In this guide, we explain the most common Japanese knife steels in simple terms and help you understand which type may suit you best.
What Makes Japanese Knife Steel Different?
Japanese kitchen knives are often made from harder steels than many traditional Western kitchen knives.
A harder steel can support a thinner cutting edge and maintain sharpness for longer, which is one reason Japanese knives are known for their precision and cutting performance.
However, hardness also comes with trade-offs.
Very hard steels can be less forgiving if the knife is twisted, used on hard cutting surfaces, or used for bones and frozen food.
That is why steel should always be considered together with:
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Heat treatment
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Blade geometry
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Grind
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Thickness
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Intended use
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Sharpening quality
A premium steel does not automatically make a premium knife.
Stainless Steel vs Carbon Steel
Before looking at individual steels, it helps to understand the two main categories.
Stainless Steel
Stainless steels contain enough chromium to offer strong corrosion resistance.
They are generally easier to maintain and are a very good choice for most home cooks and professional chefs who want performance without excessive maintenance.
Stainless steels can still rust if neglected, but they are much more forgiving than carbon steel.
Popular stainless Japanese knife steels include:
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VG10
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Ginsan
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AUS10
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AUS8
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ZA18
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SG2
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SRS13
Carbon Steel
Carbon steels contain less chromium and are more reactive.
They can develop patina and rust if left wet or exposed to acidic foods for too long.
The benefit is that many carbon steels are very responsive on whetstones and can take extremely refined edges.
Popular Japanese carbon steels include:
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Aogami Super
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Aogami #2
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Shirogami #1
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Shirogami #2
Carbon steel is loved by many professionals and enthusiasts, but it requires better care.
VG10
VG10 is one of the most widely used stainless steels in Japanese kitchen knives.
It offers a strong balance of:
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Good edge retention
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Good corrosion resistance
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Fine sharpness
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Reasonable ease of sharpening
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Good value
VG10 is commonly hardened to around 60–61 HRC, although this varies by maker.
It is used in a huge range of knives, from entry-level Japanese knives to premium Damascus lines.
Who is VG10 best for?
VG10 is an excellent choice for:
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First-time Japanese knife buyers
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Home cooks
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Professional chefs
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Anyone who wants low maintenance
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Users who still want strong edge retention
It is one of the safest all-round choices.
SG2 / R2
SG2, also known as R2, is a powdered metallurgy stainless steel.
Powder metallurgy allows very fine and even alloy distribution, which can result in excellent performance when properly heat treated.
SG2 is known for:
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Excellent edge retention
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High hardness
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Fine cutting edges
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Strong corrosion resistance
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Premium performance
Many SG2 knives are hardened to around 62–64 HRC.
Because of that hardness, SG2 can hold an edge longer than many conventional stainless steels.
Downsides of SG2
The harder steel can be less forgiving of poor technique.
It may also take more effort to sharpen than softer stainless steels.
Who is SG2 best for?
SG2 is a strong choice for:
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Experienced home cooks
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Professional chefs
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Users who want long edge retention
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Buyers looking for premium performance
If you want a stainless knife that stays sharp for a long time, SG2 is one of the strongest options.
Ginsan / Silver #3
Ginsan, also called Silver #3, is a stainless Japanese steel that behaves in some ways like traditional carbon steel.
It offers:
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Good corrosion resistance
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Fine grain structure
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Excellent sharpening feel
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Very good sharpness
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Good edge retention
Ginsan is particularly popular with users who want stainless convenience but prefer the sharpening response of carbon steel.
Who is Ginsan best for?
Ginsan is ideal for:
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Home cooks
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Professional chefs
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Users who sharpen their own knives
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Buyers who want stainless steel with a more traditional feel
It is one of the most balanced steels available.
AUS10
AUS10 is a Japanese stainless steel often used in mid-range kitchen knives.
It offers:
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Good toughness
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Good corrosion resistance
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Easy sharpening
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Solid edge retention
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Good value
AUS10 is slightly softer and often more forgiving than very hard steels like SG2.
Who is AUS10 best for?
AUS10 is ideal for:
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First-time Japanese knife buyers
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Everyday kitchen use
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Users who want easy maintenance
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Buyers looking for strong value
It is a very practical steel.
AUS8
AUS8 is another Japanese stainless steel that is generally softer and tougher than many premium knife steels.
It offers:
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Good corrosion resistance
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Easy sharpening
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Good toughness
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Lower risk of chipping
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Moderate edge retention
It may not stay sharp as long as SG2 or VG10, but it is easy to maintain.
Who is AUS8 best for?
AUS8 works well for:
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Everyday kitchen knives
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Boning and utility knives
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Users who prioritise toughness
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People who want simple sharpening
ZA18
ZA18 is a Japanese stainless steel often compared with VG10.
It contains a relatively high carbon and chromium content and can provide:
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Good edge retention
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Strong corrosion resistance
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Fine sharpness
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Good overall durability
When properly heat treated, ZA18 can perform very well in chef knives and multi-purpose blades.
Who is ZA18 best for?
ZA18 suits:
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Home cooks
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Professional kitchens
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Users looking for an alternative to VG10
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Buyers who want stainless performance
Aogami Super
Aogami Super is one of Japan’s most respected high-carbon steels.
“Aogami” means Blue Paper steel.
Aogami Super includes additional alloying elements that improve edge retention compared with simpler carbon steels.
It is known for:
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Excellent edge retention
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High hardness
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Very fine sharpness
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Strong performance on thin edges
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Excellent sharpening potential
However, it is reactive and requires careful maintenance.
Who is Aogami Super best for?
Aogami Super is ideal for:
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Knife enthusiasts
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Professional chefs
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Users comfortable with carbon steel care
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People who want very high edge performance
It is not the best choice for someone who frequently leaves knives wet or unwashed.
Aogami #2
Aogami #2 is another Blue Paper carbon steel.
It offers:
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Excellent sharpness
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Very good edge retention
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Good toughness for a hard carbon steel
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Excellent sharpening response
Compared with Aogami Super, it may have slightly lower edge retention but can be easier to sharpen and more predictable.
Who is Aogami #2 best for?
It is a strong choice for:
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Professional chefs
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Experienced home cooks
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Carbon steel enthusiasts
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Users who sharpen with whetstones
Shirogami / White Steel
Shirogami means White Paper steel.
It is a very pure carbon steel with relatively few alloying elements.
The two most common versions are:
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Shirogami #1
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Shirogami #2
White steel is known for:
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Extremely fine sharpness
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Excellent sharpening feel
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Simple alloy composition
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Traditional Japanese knife performance
It is also highly reactive and requires careful drying.
Shirogami #2
White #2 is one of the most common carbon steels in traditional Japanese knives.
It offers:
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Excellent sharpness
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Easy sharpening
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Fine edge refinement
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Good balance between hardness and toughness
It is commonly used in:
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Deba
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Yanagiba
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Usuba
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Traditional single-bevel knives
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Some Gyuto and Santoku
Who is White #2 best for?
White #2 is ideal for users who enjoy sharpening and want a traditional carbon steel experience.
Shirogami #1
White #1 contains more carbon than White #2 and can reach higher hardness.
It can take an extremely fine edge, but it may also be more demanding.
Who is White #1 best for?
It is generally better suited to experienced users who understand carbon steel maintenance and sharpening.
HAP40
HAP40 is a high-speed powdered steel originally developed for industrial cutting tools.
In kitchen knives, it is known for:
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Extremely high edge retention
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Very high hardness
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Excellent wear resistance
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Long-lasting cutting performance
HAP40 can reach hardness levels around 64–68 HRC depending on heat treatment.
Downsides of HAP40
It can be difficult to sharpen and is less forgiving than softer steels.
It is also technically semi-stainless rather than fully stainless.
Who is HAP40 best for?
HAP40 is best for:
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Advanced users
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Professional chefs
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People who want maximum edge retention
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Users comfortable with more difficult sharpening
SLD
SLD is a semi-stainless tool steel.
It offers:
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Good edge retention
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Strong toughness
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Good wear resistance
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Better corrosion resistance than traditional carbon steel
It can develop some patina depending on use.
Who is SLD best for?
SLD is a good middle ground for users who want carbon-like cutting performance without full carbon steel maintenance.
SRS13
SRS13 is a powdered stainless steel used in some high-performance Japanese knives.
It offers:
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High hardness
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Good edge retention
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Corrosion resistance
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Fine edge stability
It is a premium steel and often appears in higher-end Japanese knives.
Which Steel Is Easiest to Maintain?
If low maintenance is your priority, consider:
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VG10
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Ginsan
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AUS10
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AUS8
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ZA18
These are all stainless steels and are generally forgiving in daily use.
Which Steel Has the Best Edge Retention?
For very high edge retention, consider:
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HAP40
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SG2
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Aogami Super
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SRS13
However, higher edge retention usually comes with harder sharpening and less tolerance for misuse.
Which Steel Is Easiest to Sharpen?
For easy sharpening, consider:
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Shirogami #2
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Aogami #2
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Ginsan
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AUS8
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AUS10
Traditional carbon steels often feel excellent on whetstones.
Which Steel Is Best for Beginners?
For most first-time buyers, we usually recommend:
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VG10
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Ginsan
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AUS10
These steels offer a strong balance of sharpness, durability, corrosion resistance and ease of maintenance.
Which Steel Is Best for Professionals?
That depends on the professional.
A chef who values easy maintenance may prefer VG10, Ginsan or SG2.
A chef who sharpens frequently and wants maximum feedback may prefer Aogami or Shirogami.
A professional who wants extreme edge retention may prefer HAP40 or SG2.
There is no universal answer.
Does Higher HRC Mean Better Steel?
No.
HRC refers to Rockwell hardness.
Higher hardness can improve edge retention, but it does not automatically mean better performance.
A very hard knife with poor heat treatment or poor geometry can perform worse than a slightly softer knife from a skilled maker.
The overall knife matters more than one number.
Does Damascus Affect the Steel Performance?
Not usually.
Damascus refers to layered cladding around the core steel.
The cutting edge is normally determined by the core steel.
For example, a VG10 Damascus knife still cuts primarily based on the performance of the VG10 core.
Damascus mainly adds:
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Appearance
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Craftsmanship
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Layered construction
It does not automatically make the knife sharper.
How Important Is Heat Treatment?
Extremely important.
Two knives made from the same steel can perform very differently depending on how they are heat treated.
Good heat treatment affects:
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Hardness
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Toughness
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Edge stability
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Sharpening response
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Edge retention
This is why maker reputation matters just as much as steel name.
The Best Steel Is the One That Suits You
When choosing a Japanese knife, do not ask only:
“Which steel is best?”
Ask:
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How often do I want to sharpen?
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Do I want stainless or carbon?
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Do I care more about toughness or edge retention?
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Am I comfortable with patina?
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Do I sharpen my own knives?
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How carefully do I use and store my knives?
The right steel is the one that matches your habits.
Quick Steel Guide
If you want easy maintenance:
VG10, Ginsan, AUS10
If you want premium stainless performance:
SG2, SRS13
If you want traditional carbon steel:
Shirogami #2, Aogami #2
If you want maximum edge retention:
HAP40, SG2, Aogami Super
If you want easy sharpening:
Shirogami #2, Ginsan, AUS10
If you want a balanced first Japanese knife:
VG10, Ginsan, AUS10
Final Thoughts
Japanese knife steel can look complicated at first, but you do not need to become a metallurgist to choose a good knife.
Focus on the balance between sharpness, maintenance, edge retention and sharpening.
For most people, a quality stainless steel such as VG10, Ginsan or AUS10 is an excellent starting point.
For more experienced users, SG2, Aogami Super, Shirogami or HAP40 can offer higher performance, but they also demand more care or sharpening skill.
At Sharp Knives Malta, we select knives based on the complete package — steel, heat treatment, geometry, craftsmanship and real-world performance — not just the steel name.
If you are unsure which steel suits you best, ask us before choosing your knife. The right steel should match the way you cook, maintain and use your tools.