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Well, it depends. There are phase structures that provide a hard tough state. I doubt they can be achieved with typical stainless chemistries though. The steels that are amenable to this process...

In reverse order: there is a functional reason for swords, none for razors. But, it does look very cool because it's hard to get right in a small blade. At least to my eye.

Now, having just...

Good insights there. Silver steel is still available in round rod. I've found it as stock for making drill bits. But you're correct about it not being available in flats or bars. Funny enough...

Have confidence in your heat treater too. These are all simple steels if treated simply. The O-1 has the potential for some other interesting stuff to happen, but that is a little more complicated,...