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I'd start with 400 degrees F in a conventional cooker oven for an hour.
My logic is you can always give it an extra hour later if you feel the need.
I think this equates to about 204 in centigrade...

Excellent work, very, very nice knife. I love to see the original file edges left in.

Ive often toyed with the idea of making a razor from a file without the hardening step but maybe locally...