Blue #2, or Hitachi Aogami #2, earns its place in professional kitchens through a combination of edge sharpness, retention, and toughness that makes it one of the most trusted carbon steels in the Japanese knife tradition. Katsuto Tanaka heat-treats it to 62-63 HRC at Tanaka Kama Kogyo in Omura City, Nagasaki Prefecture - a fourth-generation blacksmith shop whose roots trace back over 800 years.
The sujihiki is Japan's dedicated slicing knife. At just about 6 oz, it is surprisingly substantial for a slicer, giving the blade momentum through long pull strokes. Blue #2 at 62-63 HRC holds a fine reactive edge through sustained protein slicing.
Care Instructions: Blue #2 is a reactive carbon steel - the stainless cladding protects the flanks, but the exposed carbon edge will patina naturally with use. Wipe and dry the blade immediately after every use. Avoid leaving acidic foods on the edge. Hand wash only; never put it in the dishwasher. Apply camellia oil for long-term storage. Sharpen on quality water stones - Blue #2 at 62-63 HRC sharpens easily and rewards good technique. Strop regularly between sharpenings.
Each knife is made by hand so measurements may vary.Blacksmith: Katsuto Tanaka
Workshop: Tanaka Kama Kogyo
Location: Omura City, Nagasaki Prefecture, Japan
Construction: Hammer Forged, San Mai
Edge Steel: Blue #2 Carbon Steel
Cladding: Nashiji Stainless
HRC: 62-63
Finish: Nashiji
Edge Grind: Even (50/50), Double Bevel
Handle: Octagonal Walnut
Ferrule: Black Pakka Wood
Weight: 5.8 oz (164 g)
Blade Length: 248 mm
Total Length: 398 mm
Spine Thickness at Heel: 4 mm
The sujihiki is Japan's dedicated slicing knife. At just about 6 oz, it is surprisingly substantial for a slicer, giving the blade momentum through long pull strokes. Blue #2 at 62-63 HRC holds a fine reactive edge through sustained protein slicing.
Care Instructions: Blue #2 is a reactive carbon steel - the stainless cladding protects the flanks, but the exposed carbon edge will patina naturally with use. Wipe and dry the blade immediately after every use. Avoid leaving acidic foods on the edge. Hand wash only; never put it in the dishwasher. Apply camellia oil for long-term storage. Sharpen on quality water stones - Blue #2 at 62-63 HRC sharpens easily and rewards good technique. Strop regularly between sharpenings.
Each knife is made by hand so measurements may vary.
