deferentially heat treating O1 tool steel

Square forges are not a problem. The trouble I see on this forge is the open back and too big of a door. It is losing heat out of both ends.
 
I didnt mean to put a halt to this thread, sorry. I use a square forge, Ed Fowler uses a square forge. Both of ours have the back door on them and the front openings are smaller than the originals. The heat is held in that way and bounces into all the corners. The atmosphere is controlled by the propane valve and the air door on the fan. All forges need time to equalize the temperatures regardless of their shapes for forging or welding. For heat treating I use a stainless pipe with one end welded closed to further reduce oxygen and give a lower, even temp inside the pipe. For edge quenching I just do it with a torch like Fowler does his.
 
I don't think you put a halt to it. :) You're probably right about closing the ends off. The only forges I have experience are round ones, so what do I know. :D
I now use my heat treat oven for heat treating. Until recently, I continued to use the forge for thermal cycling, but I kept getting alloy banding, so I now do it in the oven.
 
I also heat treat in my oven but if Im just edge quenching it is very quick to just use the torch. There are several ways to achieve the same results. I use to fire up the salt pot but for just a couple blades and with 52100 that needs 3 times its just easier to grab the torch or forge.
 
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