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That is new to me, I was always told by knife makers that one can't just go to Hitachi and buy from them like one can go to Uddeholm or Crucible and buy from them direct.

White steel is not available outside of Japan, that is why most razors are not made from it. Most kamisori are made from white steel though.
Kamisori are not made honyaki AFAIK, Iwasaki western...

the most common steel used on Japanese knives is White #2, solid or san mai.
The draw back is that Japan does not export their steels so if you want to use white 2 you will have to find someone to...