R2 / SG2 vs Ginsan

A powder-metallurgy stainless steel developed by Takefu Special Steel. R2 and SG2 refer to the same steel from different suppliers. Combines surprisingly good stainless properties with very high hardness and excellent edge retention. One of the most practical high-performance steels for everyday use.

Ginsan (Gingami #3) is a stainless steel from Hitachi with a carbon level approaching white steel — a deliberate design to bring near-Shirogami sharpness in a rust-resistant body. Loved by professional Japanese chefs who need stainless practicality without sacrificing the razor-keen edge that carbon steel provides.