White Steel vs Blue Steel

 

 

Ask about a hand forged Japanese knife and within a minute someone will say "White 2" or "Blue Super" as if it explains everything. This guide is the plain English version. What the names actually mean, how the steels behave on the board and on the stones, and how to choose between them. It goes with our broader knife steel characteristics guide, which covers stainless steels too.

Where the names come from

Shirogami (White) and Aogami (Blue) are Yasugi specialty steels, produced at the Yasugi works in Shimane Prefecture, long operated by Hitachi Metals (renamed Proterial in 2023). The region has smelted steel from local iron sand for centuries, and that heritage is part of why Yasugi steel is so trusted for blades. The names refer to the colour of the paper the steel bars are wrapped in at the mill, not the colour of the blade. Blue steel is White steel with extra alloying elements added. That one fact explains most of what follows.

White steel (Shirogami)

White steel is about as pure as carbon steel gets. Iron, carbon and very little else. That purity means it sharpens quickly to an extremely keen edge and feels clean and crisp on the stones. It is many sharpeners' favourite steel to work with, ours included. The trade off is that the edge does not last as long as Blue steel, and the blade will rust if you neglect it.

• White 1 has more carbon. It is harder, takes the keenest edge of the family, and is slightly less forgiving. Browse White 1 knives.
  
• White 2 has a touch less carbon and is a touch tougher. It is the classic choice for hand forged knives and traditional single bevels. Browse White 2 knives.

Blue steel (Aogami)

Blue steel starts as White steel, then adds tungsten and chromium. Those elements form hard carbides in the steel. The edge keeps cutting noticeably longer and the blade is a little tougher. In exchange it takes a bit more work on the stones and loses a little of that glassy White steel feel.

• Blue 1 sits on the keener side of the family and turns up on high end gyuto and single bevels. Browse Blue 1 knives.
  
• Blue 2 is the workhorse. Balanced, forgiving, and used by many of the smiths we carry. Browse Blue 2 knives.
  
• Blue Super (Aogami Super) adds more carbon and tungsten plus molybdenum and vanadium. It is the hardest wearing of the family and holds an aggressive edge for a long time. Browse Blue Super knives.

How they compare in practice

• Sharpest possible edge: White 1, by a whisker. In honesty, every steel here gets sharper than most people have ever experienced.
  
• Easiest to sharpen: the White steels. They respond fast and feel wonderful on a whetstone, which also makes them ideal for learning to sharpen.
  
• Longest lasting edge: Blue Super, then Blue 2 and Blue 1.
  
• Rust care: the same honesty is required for all of them. Wipe the blade during use, wash and dry it straight after, and oil it before long storage. Over time the blade develops a patina, a grey blue oxide layer that protects the steel and records what you have cooked.

"I like the edge, not the maintenance"

There are two honest ways out. First, stainless clad carbon knives wrap a White or Blue core in stainless steel, so only the few millimetres of exposed edge needs carbon steel care. Second, modern stainless and powdered steels such as Ginsan and SG2 get remarkably close to carbon steel performance with none of the rust worry. There is no shame in that choice at all.

Choosing between them

• First carbon steel knife: White 2 or Blue 2. Both are forgiving, both are classics, and both are well represented in our carbon steel range.
  
• You love sharpening, or want to learn: White steel. Pair it with one of our Brisbane sharpening classes and it will reward you for decades.
  
• You cook long shifts and hate touch ups: Blue 2 or Blue Super.
  
• Traditional single bevels such as yanagiba, deba and usuba are mostly White steel by tradition, with Blue appearing on premium pieces.

Still deciding? Come and handle both in the studio. The difference is easier to feel than to read about. Or email contact@japaneseknifestudio.com.au and tell us what you cook. We would rather point you to the right steel than the most expensive one.