Casehardening at -40 C

This weekend Saskatchewan was the coldest place on earth so of course I casehardened 2 actions. My old PID on the 1970’s temperature controller died so I used my PID from my nitre tank for the furnace. I cranked the temperatures up a fair bit. The. Colors are more muted but still very nice in my opinion. The Stevens favorite is a mallable cast iron and can be a challenge to get nice colors but these darker more subdued colors are quickly growing on me.

First up is an old Winchester low wall we rebarreled to 32-20.

Next up was a 1915 Stevens favorite. 2 hours at 820 C so much higher temp than my normal.