O1 needs a soak at temp. Your target temp is 1500.
http://www.blksmth.com/images/large_size/Color Chart3.jpg
This heat scale is from
http://www.blksmth.com/heat_colors.htm
Going from color picts on the internet ain't the best. For your reference, it will probably go nonmagnetic somewhere around 1400.
You'll want to obtain an even temp without overheating your edge or the tip and maintain that temp for at least a few minutes. If you have spheroid annealed O1 (most is) all your carbon is tied up with your alloying agents for ease of machining. You need to give it time to dissolve in the steel for the O1 to perform well. Otherwise, even though the hard spots will skate a file, the blade won't hold an edge.
hey im a newbie too and i just have one question. what do you mean by needing to give it time to dissolve. when do you give it time and for how long thanks