For most users, Shirogami #2 is the "better" choice because it offers the best balance between extreme sharpness and practical durability. While Shirogami #1 can achieve a theoretically sharper edge, it is much more brittle and prone to chipping.
Shirogami #1 vs. Shirogami #2
Feature | Shirogami #1 (White #1) | Shirogami #2 (White #2) |
|---|---|---|
Carbon Content | Higher (1.25–1.35%) | Lower (1.05–1.15%) |
Max Hardness | 61–64+ HRC | 60–63 HRC |
Sharpness | Highest potential | Outstanding |
Toughness | Brittle; chips easily | More forgiving; less brittle |
Best For | Master chefs, precision sashimi work | Everyday professional or home use |
Which should you choose?
Choose Shirogami #2 if: You want a traditional high-carbon knife for daily use. It is the "gold standard" for versatility and is significantly easier to maintain because the edge is less likely to micro-chip during standard food prep. Many experts, like those at Hasu-Seizo, recommend it as the ideal benchmark for white steel.
Choose Shirogami #1 if: You are a professional chef or an enthusiast who has mastered knife skills and sharpening. It offers the absolute peak of refinement but requires a very delicate touch. Retailers like Koi Knives note that its increased hardness provides slightly better edge retention, though this comes at the cost of durability.
Ultimately, the blacksmith's heat treatment often matters more than the specific grade. If this is your first "white steel" knife, #2 will give you a much better experience. Reviewers on Reddit often suggest that the difference in maximum sharpness is negligible for 99% of tasks.