我只是用過很多把刀子
沒甚麼厲害的

其實你google打 "wusthof steel grade"就能查到了
Wusthof uses X50CrMo14 at 56 HRC. X50CrMo14 is very similar to 425M, so it is easy to sharpen. Most european kitchen knives use similar steels.

所以是德國鋼X50CrMo14 hrc56