White 1 / Shirogami #1 · 白一鋼

Yes, among Shirogami 1, 2 and 3 on Proterial's pages. It describes Shirogami 1 (白紙1号) as having the highest hardness and gives it 1.25 to 1.35% carbon, compared with high hardness and 1.05 to 1.15% carbon for Shirogami 2, and middle hardness and 0.80 to 0.90% carbon for Shirogami 3.

All three are carbon steels that can rust, so wash the knife and dry it after use.

White 1, White 2 and White 3 are Proterial's Shirogami 1, Shirogami 2 and Shirogami 3. Proterial lists carbon at 1.25 to 1.35% for Shirogami 1, 1.05 to 1.15% for Shirogami 2 and 0.80 to 0.90% for Shirogami 3, with the same silicon and manganese ranges for all three and no chromium listed.

Proterial describes all three as carbon steel with minimum impurities, at highest, high and middle hardness in that order, and gives a hardening hardness of over 60 HRC for each.

Shirogami 1 (White 1) has more carbon than Shirogami 2 (White 2): Proterial lists 1.25 to 1.35% carbon for Shirogami 1 and 1.05 to 1.15% for Shirogami 2, with the same silicon (0.10 to 0.20%) and manganese (0.20 to 0.30%) ranges for both.

Proterial describes both as carbon steel with minimum impurities, Shirogami 1 with the highest hardness and Shirogami 2 with high hardness, and gives a hardening hardness of over 60 HRC for both. It lists Shirogami 1 for the highest quality tipped tools, planes, chisels and razors, and Shirogami 2 for high quality tipped tools, chisels, razors, sickles, axes and gravers.