Well I get your train of thought but we had one othery type of steel for quite long: https://en.wikipedia.org/wiki/King_C._Gillette#/media/File:Gillette_razor_

Well I get your train of thought but we had one othery type of steel for quite long: https://en.wikipedia.org/wiki/King_C._Gillette#/media/File:Gillette_razor_patent.png https://en.wikipedia.org/wiki/King_C._Gillette#/media/File:G... But it is fair point I am not interested to find more what kind of steel do they use for those sharpeners.