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Since we are talking heat treating O1, here is what I wonder about.

How much soak time (in a stable temperature) at critical temperature is needed for the alloying elements to fully diffuse?
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Yes Fahrenheit,

I admire your language skills, I am an one language speaker.

If I feel it is too hard I will bump the temp up by 25 degrees and re-temper for two more hours. and so on an so on, until I get the...

I am not sure I understand, after quenching/hardening is finished I will temper at 400 degrees for two hours.

For razors O1 I temper two hours at 400 F.

Charlie

It all sounds right to me, the only thing that comes to my mind, is how thick was the edge prior to heat treat.

I started off having trouble/inconsistent edges with heat treating O1. I was not...