White Steel #2 - High Carbon Steel

White Steel is regarded as one of the pinnacles of sharpness for kitchen knives, and is used heavily in Japanese cuisine. White Steel #2 is the craftsman's benchmark in carbon steels, and this blog will explore why that is, what makes it popular and why you should consider getting it for your next knife.

White Steel #2 (Shirogami 2) - High Hardness, High Sharpness

White Steel is crafted with a focus on minimizing impurities and amongst its many variations, White Steel #2 is regarded as having the best balance. It is a knife steel we recommend in the store often for a large variety of reasons. While there isn't a knife steel that suits every use case, we feel White Steel #2 meets most of them and recommend ours proudly. This steel focuses on the perfect balance of sharpness and maintainability, all while still without burning through your wallet on simpler models. It's also an excellent steel for people who love to sharpen as it is wonderful to work with and maintain.


The Standard of Japanese Knives

When buying your first Japanese knife, we highly recommend starting off with White Steel #2 as the best choice.

Just as a chef’s skill can be truly tested by a spaghetti aglio e olio, a knife artisan’s skill can be similarly tested by how they create White Steel #2 knives.

White Steel #2, also called Shirogami #2 sets the standard for Japanese knives. It’s the most widely used, and knife artisan’s reputations can be based primarily on how high quality their White Steel #2 knives are.

From forging to heat treatment and edge sharpening, the mastery of all these processes using White Steel #2 is considered a major milestone in a knife artisan’s career.

Further, when discussing attributes of other steels like hard versus soft, easy to sharpen versus difficult to sharpen, or rust-prone versus rust-resistant, White Steel #2 is generally used as the benchmark to compare these to. Effectively, White Steel #2 can be considered the standard and main comparison point that all other Japanese knives are based on.

Of course, White Steel #2 has also been given a very strong reputation due to the feedback from general users of the end product, further establishing its name and fame.


Steel Mapping Comparison

Steel material is crucial for indicating a knife's initial performance (amongst many other things related to craftsman ability and more). Below are some comparisons to give you some understanding showing what a particular step of the process does in terms of impacting sharpness, balance and maintainability.

Steel Material Heat Treatment/Forging Edge Sharpening Handle Attachment

Sharpness

Balance

Maintainability

Steel Material Heat + Forging Making Edges Handle Attach.

Sharp.

Bal.

Maint.

There’s three key pointers in the above chart to focus on.

  • Steel Material has a large impact on sharpness and maintainability (ease of sharpening and resistance to rust).

  • Apart from sharpness, heat treatment and the sharpening process in knife creation also have a large impact on sharpness.

  • Measuring a knife’s strengths is more than just its sharpness. Balance and maintainability also need to be considered.

Based on the above steel mapping chart, White Steel #2 falls in this position on the graph below

Japanese Knife Steel Chart - White Steel #2 (Shirogami 2)

On top of this, White Steel #2 is often regarded as a “pure” and “straightforward” steel by knife sharpeners because it is very workable with whetstones. It even keeps a clean, sharp edge when using fine-grit finishing stones.

White Steel #2 - Pure and Straightforward


Composition Comparison

Let’s look at the tables below and explore the composition of White Steel #2 more deeply.

Manufacturer Steel Name Carbon Silicon Cobalt Phosphorus Sulfur Manganese

Effect of Material

Hardness

Hardness (⅒ of Carbon)
Oxygen Removal

Decarburization Prevention
Toughness
Wear Resistance

Embrittlement

Embrittlement

Sulfur Removal
Toughness

Listed Value

Average

Maximum

Average

Maximum

Maximum

Average

Hitachi Metals

Yellow Steel #2

1.1

0.15

0.03

0.006

0.25

Hitachi Metals

White Steel #3

0.9

0.2

0.025

0.004

0.25

Takefu Special Steel

White Steel #2

1

Undisclosed

Undisclosed

Undisclosed

Undisclosed

Hitachi Metals

White Steel #2

1.1

0.15

0.025

0.004

0.25

Hitachi Metals

White Steel #1

1.3

0.15

0.025

0.004

0.25

Hitachi Metals

Blue Steel #2

1.1

0.15

0.025

0.004

0.25

Hitachi Metals

Blue Steel #1

1.3

0.15

0.025

0.004

0.25

Hitachi Metals

Blue Steel Super

1.45

0.15

0.025

0.004

0.25

JIS Standard

SK4

0.95

0.2

0.03

0.03

0.25

Hitachi Metals x Masahiro

ZCD-U

1.05

Undisclosed

Undisclosed

Undisclosed

Undisclosed

Manufacturer Steel Name Molybdenum Vanadium Nickel Tungsten Copper Chromium Hardness Rockwell Counter (HRC)

Effect of Material

Wear Resistance
Anti-Corrosion
Toughness

Wear Resistance
Decarburization Prevention

Toughness

Wear Resistance

Antibacterial Effects
Embrittlement

Anti-Corrosion

Changes in the quenching process

Listed Value

Average

Average

Average

Average

Maximum

Average

Hitachi Metals

Yellow Steel #2

56

Hitachi Metals

White Steel #3

55

Takefu Special Steel

White Steel #2

1

0.3

60

Hitachi Metals

White Steel #2

61

Hitachi Metals

White Steel #1

66

Hitachi Metals

Blue Steel #2

1.25

0.35

61

Hitachi Metals

Blue Steel #1

1.75

0.4

65

Hitachi Metals

Blue Steel Super

0.4

2.25

0.35

67

JIS Standard

SK4

0.25

0.3

55

Hitachi Metals x Masahiro

ZCD-U

Contains

Contains

59

Maker Steel Name Carbon Silicon Cobalt

Effect

Hard.

Hard. (⅒ Carbon)
Oxygen Rem.

Decarb Pvnt.
Tough.
Wear Res.

Listed Value

Average

Max

Average

Hitachi Metals

Yellow Steel #2

1.1

0.15

Hitachi Metals

White Steel #3

0.9

0.2

Takefu Special Steel

White Steel #2

1

Not Stated

Hitachi Metals

White Steel #2

1.1

0.15

Hitachi Metals

White Steel #1

1.3

0.15

Hitachi Metals

Blue Steel #2

1.1

0.15

Hitachi Metals

Blue Steel #1

1.3

0.15

Hitachi Metals

Blue Steel Super

1.45

0.15

JIS Std.

SK4

0.95

0.2

Hitachi Metals x Masa-
hiro

ZCD-U

1.05

Not Stated

Maker Steel Name Phos. Sulfur Mang.

Effect

Embrittlement

Embrittlement

Sulfur Rmvl.
Tough.

Listed Value

Max

Max

Average

Hitachi Metals

Yellow Steel #2

0.03

0.006

0.25

Hitachi Metals

White Steel #3

0.025

0.004

0.25

Takefu Special Steel

White Steel #2

Not Stated

Not Stated

Not Stated

Hitachi Metals

White Steel #2

0.025

0.004

0.25

Hitachi Metals

White Steel #1

0.025

0.004

0.25

Hitachi Metals

Blue Steel #2

0.025

0.004

0.25

Hitachi Metals

Blue Steel #1

0.025

0.004

0.25

Hitachi Metals

Blue Steel Super

0.025

0.004

0.25

JIS Std.

SK4

0.03

0.03

0.25

Hitachi Metals x Masa-
hiro

ZCD-U

Not Stated

Not Stated

Not Stated

Maker Steel Name Molyb. Vanad. Nickel

Effect

Wear Res.
Anti-Corrosion
Tough.

Wear Res.
Decarb Pvnt.

Tough.

Listed Value

Average

Average

Average

Hitachi Metals

Yellow Steel #2

Hitachi Metals

White Steel #3

Takefu Special Steel

White Steel #2

1

Hitachi Metals

White Steel #2

Hitachi Metals

White Steel #1

Hitachi Metals

Blue Steel #2

Hitachi Metals

Blue Steel #1

Hitachi Metals

Blue Steel Super

0.4

JIS Std.

SK4

Hitachi Metals x Masa-
hiro

ZCD-U

Has

Maker Steel Name Tung. Copper Chrom.

Effect

Wear Res.

Antibac.
Embrittlement

Anti-Corrosion

Listed Value

Average

Max

Average

Hitachi Metals

Yellow Steel #2

Hitachi Metals

White Steel #3

Takefu Special Steel

White Steel #2

0.3

Hitachi Metals

White Steel #2

Hitachi Metals

White Steel #1

Hitachi Metals

Blue Steel #2

1.25

0.35

Hitachi Metals

Blue Steel #1

1.75

0.4

Hitachi Metals

Blue Steel Super

2.25

0.35

JIS Std.

SK4

0.3

Hitachi Metals x Masa-
hiro

ZCD-U

Has

White Steel #2 is only composed of five elements: Carbon (C), Silicon (Si), Phosphorus (P), Sulfur (S) and Manganese (Mn). Phosphorus and sulfur levels are kept low also as they are known to create brittleness, making White Steel #2 a genuinely pure steel.


Making of Japanese Knife

Why we recommend White Steel #2 for your first Japanese Knife

Getting accustomed to Carbon Steel Knives

In the world of Japanese cuisine, carbon steel knives make up a large portion of knives that are used. As an example of this, sushi chefs often wipe their knife down with a cloth after every single use. This practice is essential for carbon steel knife maintenance as leaving moisture on the blade can lead to rust developing incredibly quickly. In a sense, due to the care required with carbon steel knives it can be said that most Japanese chefs are also very aware of the rituals associated with using them.

These rituals can quickly become habits after continually doing them and it becomes second-nature. As a note, not all steel knives need such care - stainless steel for example already has good rust resistance thanks to its material structure. Nevertheless, it is good to be aware of such knife care in case you receive or give the gift of a carbon steel knife, or perhaps borrow someone else's so you can prevent unintentional rust forming.

Starting with a carbon steel knife to learn sharpening techniques and handling is recommended. Once you’re accustomed to them, you can experiment using other steel knives such as stainless steel more comfortably.

 

Affordable Knives does not mean beginner friendly

There are cheaper steels out there compared to White Steel #2, and at first those might seem like a better option for beginners or your first Japanese carbon knife. For example, you may see Yellow Steel (Kigami), White Steel #3 (Shirogami #3) and even SK4 Steel. These knives are at a lower price point not because of the materials, but rather the manufacturing processes involved. The idea is to reduce complexity in their manufacturing, and thus make them more accessible price-wise.

However, many of these cheaper knives do not have the backside concave finish, don’t follow traditional Japanese knife shapes or may have uneven blade surfaces. Without a deep understanding of sharpening, these cheaper knives can wind up being much more difficult to actually use. On the other hand, White Steel #2 knives are crafted with significantly more precision, especially as they are often seen as a craftsman’s signature knife. This gives you a knife with amazing sharpness, solid edge retention and are also easy to sharpen and use - perfect for your first knife!

Despite them sometimes being recommended as a starting point, we instead recommend White Steel #2 over Yellow Steel or 8A Stainless Steel for the reasons above.


Variations of White Steel #2 Sourcing

It’s important to note that while simply saying White Steel #2 paints a good picture of what steel to expect in a knife, White Steel #2 itself (as like other steels) can also differ from manufacturer to manufacturer. For instance, one manufacturer adds materials like nickel and chromium, commonly found in stainless steel. This changes the characteristics of the White Steel #2 itself, giving it a bit more resilience at the sacrifice of ease of sharpening.

In the knife-making community, especially in Sakai which boasts over 90% of knife production, there are some makers that prefer more traditional White Steel #2, and some that prefer it more slightly modified. It’s important to note that the benefits above more specifically apply to the purer version of the steel - don’t be afraid to ask who you’re buying it off if they know the steel manufacturer!

One manufacturer in particular rates a higher hardness, however they don’t disclose the amount of phosphorus and sulfur in their steel, which can cause brittleness. Achieving the perfect balance between resilience and hardness all comes down to the tempering process. It’s important to also remember that hardness alone doesn’t indicate superior performance, but that knives are made up of a variety of factors.

White Steel VS Blue Steel

One common misconception we hear from our customers is that Blue Steel (Aogami) is of a higher rank than White Steel (Shirogami), which is not necessarily the case.

While it is true that Blue Steel knives are more expensive, they can actually have very similar hardness values and carbon content.

If you’re after a knife with better chip resistance and resilience, Blue Steel is likely the way to go because of its extra additives. In turn, if you prefer ease of sharpening and just how quickly you can get a sharp edge, White Steel may be for you. It all comes down to your preferences and how much you want to engage with maintaining your knife.

Conclusion

Let’s quickly recap what this article has covered

  • White Steel #2 is the standard for Japanese knives and is often used in the signature knives of craftsmen, and craftsmen will often take pride in their White Steel #2.

  • If you’re using Japanese kitchen knives, White Steel #2 is a great choice for beginners.

  • Even in the category of White Steel #2, variations exist dependant on steel manufacturer.

  • If you prioritise ease of sharpening, choose White Steel. If you value chip resistance and toughness, choose Blue Steel.

If you have further questions about White Steel #2, don’t hesitate to contact us and ask or visit us in-store and see our range! It’s a brilliant material for your first knife, and we carry a large selection of knives that use it.


Look at some of our White Steel #2 knives below!